This page has only limited features, please log in for full access.
Mangrove is classified as an important ecosystem along the shorelines of tropical and subtropical landmasses, which are being degraded at an alarming rate despite numerous international treaties having been agreed. Iskandar Malaysia (IM) is a fast-growing economic region in southern Peninsular Malaysia, where three Ramsar Sites are located. Since the beginning of the 21st century (2000–2019), a total loss of 2907.29 ha of mangrove area has been estimated based on medium-high resolution remote sensing data. This corresponds to an annual loss rate of 1.12%, which is higher than the world mangrove depletion rate. The causes of mangrove loss were identified as land conversion to urban, plantations, and aquaculture activities, where large mangrove areas were shattered into many smaller patches. Fragmentation analysis over the mangrove area shows a reduction in the mean patch size (from 105 ha to 27 ha) and an increase in the number of mangrove patches (130 to 402), edge, and shape complexity, where smaller and isolated mangrove patches were found to be related to the rapid development of IM region. The Moderate Resolution Imaging Spectro-radiometer (MODIS) Leaf Area Index (LAI) and Gross Primary Productivity (GPP) products were used to inspect the impact of fragmentation on the mangrove ecosystem process. The mean LAI and GPP of mangrove areas that had not undergone any land cover changes over the years showed an increase from 3.03 to 3.55 (LAI) and 5.81 g C m−2 to 6.73 g C m−2 (GPP), highlighting the ability of the mangrove forest to assimilate CO2 when it is not disturbed. Similarly, GPP also increased over the gained areas (from 1.88 g C m−2 to 2.78 g C m−2). Meanwhile, areas that lost mangroves, but replaced them with oil palm, had decreased mean LAI from 2.99 to 2.62. In fragmented mangrove patches an increase in GPP was recorded, and this could be due to the smaller patches (<9 ha) and their edge effects where abundance of solar radiation along the edges of the patches may increase productivity. The impact on GPP due to fragmentation is found to rely on the type of land transformation and patch characteristics (size, edge, and shape complexity). The preservation of mangrove forests in a rapidly developing region such as IM is vital to ensure ecosystem, ecology, environment, and biodiversity conservation, in addition to providing economical revenue and supporting human activities.
Kasturi Kanniah; Chuen Kang; Sahadev Sharma; A. Amir. Remote Sensing to Study Mangrove Fragmentation and Its Impacts on Leaf Area Index and Gross Primary Productivity in the South of Peninsular Malaysia. Remote Sensing 2021, 13, 1427 .
AMA StyleKasturi Kanniah, Chuen Kang, Sahadev Sharma, A. Amir. Remote Sensing to Study Mangrove Fragmentation and Its Impacts on Leaf Area Index and Gross Primary Productivity in the South of Peninsular Malaysia. Remote Sensing. 2021; 13 (8):1427.
Chicago/Turabian StyleKasturi Kanniah; Chuen Kang; Sahadev Sharma; A. Amir. 2021. "Remote Sensing to Study Mangrove Fragmentation and Its Impacts on Leaf Area Index and Gross Primary Productivity in the South of Peninsular Malaysia." Remote Sensing 13, no. 8: 1427.
Aim Mangrove wetlands span broad geographical gradients, resulting in functionally diverse tree communities. We asked whether latitudinal variation, allometric scaling relationships and species composition influence mangrove forest structure and biomass allocation across biogeographical regions and distinct coastal morphologies. Location Global. Time period Present. Major taxa studied Mangrove ecosystems. Methods We built the largest field‐based dataset on mangrove forest structure and biomass to date (c. 2,800 plots from 67 countries) to address macroecological questions pertaining to structural and functional diversity of mangroves spanning biogeographical and coastal morphology gradients. We used frequentist inference statistics and machine learning models to determine environmental drivers that control biomass allocation within and across mangrove communities globally. Results Allometric scaling relationships and forest structural complexity were consistent across biogeographical and coastal morphology gradients, suggesting that mangrove biomass is controlled by regional forcings rather than by latitude or species composition. For instance, nearly 40% of the global variation in biomass was explained by regional climate and hydroperiod, revealing nonlinear thresholds that control biomass accumulation across broad geographical gradients. Furthermore, we found that ecosystem‐level carbon stocks (average 401 ± 48 MgC/ha, covering biomass and the top 1 m of soil) varied little across diverse coastal morphologies, reflecting regional bottom‐up geomorphic controls that shape global patterns in mangrove biomass apportioning. Main conclusions Our findings reconcile views of wetland and terrestrial forest macroecology. Similarities in stand structural complexity and cross‐site size–density relationships across multiscale environmental gradients show that resource allocation in mangrove ecosystems is independent of tree size and invariant to species composition or latitude. Mangroves follow a universal fractal‐based scaling relationship that describes biomass allocation for several other terrestrial tree‐dominated communities. Understanding how mangroves adhere to these universal allometric rules can improve our ability to account for biomass apportioning and carbon stocks in response to broad geographical gradients.
Andre S. Rovai; Robert R. Twilley; Edward Castañeda‐Moya; Stephen R. Midway; Daniel A. Friess; Carl C. Trettin; Jacob J. Bukoski; Atticus E.L. Stovall; Paulo R. Pagliosa; Alessandra L. Fonseca; Richard A. Mackenzie; Aslan Aslan; Sigit D. Sasmito; Mériadec Sillanpää; Thomas G. Cole; Joko Purbopuspito; Matthew W. Warren; Daniel Murdiyarso; Wolfram Mofu; Sahadev Sharma; Pham Hong Tinh; Pablo Riul. Macroecological patterns of forest structure and allometric scaling in mangrove forests. Global Ecology and Biogeography 2021, 30, 1000 -1013.
AMA StyleAndre S. Rovai, Robert R. Twilley, Edward Castañeda‐Moya, Stephen R. Midway, Daniel A. Friess, Carl C. Trettin, Jacob J. Bukoski, Atticus E.L. Stovall, Paulo R. Pagliosa, Alessandra L. Fonseca, Richard A. Mackenzie, Aslan Aslan, Sigit D. Sasmito, Mériadec Sillanpää, Thomas G. Cole, Joko Purbopuspito, Matthew W. Warren, Daniel Murdiyarso, Wolfram Mofu, Sahadev Sharma, Pham Hong Tinh, Pablo Riul. Macroecological patterns of forest structure and allometric scaling in mangrove forests. Global Ecology and Biogeography. 2021; 30 (5):1000-1013.
Chicago/Turabian StyleAndre S. Rovai; Robert R. Twilley; Edward Castañeda‐Moya; Stephen R. Midway; Daniel A. Friess; Carl C. Trettin; Jacob J. Bukoski; Atticus E.L. Stovall; Paulo R. Pagliosa; Alessandra L. Fonseca; Richard A. Mackenzie; Aslan Aslan; Sigit D. Sasmito; Mériadec Sillanpää; Thomas G. Cole; Joko Purbopuspito; Matthew W. Warren; Daniel Murdiyarso; Wolfram Mofu; Sahadev Sharma; Pham Hong Tinh; Pablo Riul. 2021. "Macroecological patterns of forest structure and allometric scaling in mangrove forests." Global Ecology and Biogeography 30, no. 5: 1000-1013.
Several ecological and biogeochemical processes in mangroves are influenced by crab activities through bioturbation, leaf litter consumption, or fecal deposition. Bioturbation might be influenced by crab burrow dynamics or surrounding abiotic and biotic factors or both. Therefore, it is necessary to examine burrow dynamics under different abiotic and biotic conditions. This study was conducted in the estuarine mangroves of Fukido River in the northern part of Ishigaki Island, Japan. Two transects consisting of five and seven 14-m diameter circular plots were established perpendicular to the mangrove/ocean interface. Spatial and seasonal burrow dynamics data were collected from five randomly chosen quadrates within each plot. Burrow density, renewed burrows per day, and collapsed burrows per day significantly varied spatially and seasonally. Burrow density strongly depended on sediment bulk density. Numbers of renewed and collapsed burrows per day were the same (R2 = 0.86) though they significantly differed among the four seasons with being lowest in the winter season. This suggests that temperature, precipitation and crabs occurrence might control seasonal burrow dynamics. Proportion of collapsed burrows were strongly and significantly correlated to sediment bulk density, salinity and sediment temperature, which suggests that sediment properties provide structural support for burrows maintenance. On the other hand, vegetation cover and sediment characteristics influence the proportion of renewed burrows. Burrow depth was significantly controlled by sediment particle size, which suggests that crabs do not create deeper burrow if sediments contain higher amount of coarse sand. Entrance diameter was correlated to percentage organic matter, salinity, fine sand and distance from the river that means seaward sites are occupied by smaller and shallow burrows. Our results suggest that the burrow dynamics depend on abiotic and biotic factors and are useful for understanding spatial and seasonal variations for estimating bioturbation effects on mangroves biogeochemical cycle.
Ryohei Egawa; Sahadev Sharma; Kazuo Nadaoka; Richard A. MacKenzie. Burrow dynamics of crabs in subtropical estuarine mangrove forest. Estuarine, Coastal and Shelf Science 2021, 252, 107244 .
AMA StyleRyohei Egawa, Sahadev Sharma, Kazuo Nadaoka, Richard A. MacKenzie. Burrow dynamics of crabs in subtropical estuarine mangrove forest. Estuarine, Coastal and Shelf Science. 2021; 252 ():107244.
Chicago/Turabian StyleRyohei Egawa; Sahadev Sharma; Kazuo Nadaoka; Richard A. MacKenzie. 2021. "Burrow dynamics of crabs in subtropical estuarine mangrove forest." Estuarine, Coastal and Shelf Science 252, no. : 107244.
Background and Objectives: In northern Vietnam, nearly 37,100 hectares of mangroves were lost from 1964–1997 due to unsustainable harvest and deforestation for the creation of shrimp aquaculture ponds. To offset these losses, efforts in the late 1990s have resulted in thousands of hectares of mangroves being restored, but few studies to date have examined how effective these efforts are at creating restored mangrove forests that function similarly to the intact mangroves they are intended to replace. Materials and Methods: We quantified and compared soil carbon (C) stocks among restored (mono and mixed species) and intact mangrove forests in the provinces of Quang Ninh, Thai Binh, Nam Dinh and Thanh Hoa in northern Vietnam. A total of 96 soil cores up to a depth of 200 cm were collected every 25 m (25, 50, 75, 100, 125, and 150 m) along 16 linear transects that were 150 m long and perpendicular to the mangrove upland interface (six cores along each transect) at Quang Ninh (four transects), Thai Binh (five), Nam Dinh (four) and Thanh Hoa (three). Five-cm-long soil samples were then collected from the 0–15 cm, 15–30 cm, 30–50 cm, 50–100 cm, and >100 cm depth intervals of each soil core. Results: The study confirmed that the soil C stock of 20–25-year-old restored mangrove forest (217.74 ± 16.82 Mg/ha) was not significantly different from that of intact mangrove forest (300.68 ± 51.61 Mg/ha) (p > 0.05). Soil C stocks of Quang Ninh (323.89 ± 28.43 Mg/ha) were not significantly different from Nam Dinh (249.81 ± 19.09 Mg/ha), but both of those were significantly larger than Thai Binh (201.42 ± 27.65 Mg/ha) and Thanh Hoa (178.98 ± 30.82 Mg/ha) (p < 0.05). Soil C stock differences among provinces could be due to their different geomorphological characteristics and mangrove age. Soil C stocks did not differ among mangroves that were restored with mixed mangrove species (289.75 ± 33.28 Mg/ha), Sonneratia caseolaris (L.) Engl. (255.67 ± 13.11 Mg/ha) or Aegiceras corniculatum (L.) Blanco (278.15 ± 43.86 Mg/ha), but soil C stocks of those mangroves were significantly greater than that of Kandelia obovata Sheue, Liu & Yong (174.04 ± 20.38 Mg/ha) (p < 0.05). Conclusion: There were significant differences in the soil C stocks of mangrove forests among species and provinces in northern Vietnam. The soil C stock of 20–25-year-old restored mangrove forest was not significantly different from that of intact mangrove forest.
Pham Hong Tinh; Nguyen Thi Hong Hanh; Vo Van Thanh; Mai Sy Tuan; Pham Van Quang; Sahadev Sharma; Richard A. MacKenzie. A Comparison of Soil Carbon Stocks of Intact and Restored Mangrove Forests in Northern Vietnam. Forests 2020, 11, 660 .
AMA StylePham Hong Tinh, Nguyen Thi Hong Hanh, Vo Van Thanh, Mai Sy Tuan, Pham Van Quang, Sahadev Sharma, Richard A. MacKenzie. A Comparison of Soil Carbon Stocks of Intact and Restored Mangrove Forests in Northern Vietnam. Forests. 2020; 11 (6):660.
Chicago/Turabian StylePham Hong Tinh; Nguyen Thi Hong Hanh; Vo Van Thanh; Mai Sy Tuan; Pham Van Quang; Sahadev Sharma; Richard A. MacKenzie. 2020. "A Comparison of Soil Carbon Stocks of Intact and Restored Mangrove Forests in Northern Vietnam." Forests 11, no. 6: 660.
Mangrove forest conservation can help reduce global C emissions. Despite this benefit to climate change mitigation and adaptation, mangrove forests are being deforested or degraded at an alarming rate, though restoration efforts may offset these losses. The impacts of deforestation to C stocks are relatively intuitive and result in significant decreases in C stocks. It remains unclear how degradation from selective harvesting of trees affects C stocks or how effective restoration efforts are at restoring C stocks. Furthermore, total ecosystem C (TEC) stocks of pristine mangroves can significantly vary spatially. To address these issues, we conducted an intensive, national assessment of mangrove forests across Cambodia using a grid approach to: 1) examine how land use land cover (i.e., pristine, deforested, degraded, and restored forests) impacts TEC stocks, and 2) how TEC stocks vary spatially across the country. TEC stocks from deforested mangroves were always lower than pristine forests, resulting in an overall loss of 60% C (480 Mg C ha−1). However, TEC stocks from degraded and 25-year-old restored mangroves forests did not differ from pristine forests. Mean TEC in mangroves was 784.7 ± 30.1 Mg C ha−1, decreasing from 957.2 ± 32.8 Mg C ha−1 in the northern region to 628.9 ± 33.1 Mg C ha−1 in the central region to 386.2 ± 19.1 Mg C ha−1 in the southern region of Cambodia. Intensive sampling in mangroves across Cambodia verified impacts of deforestation reported elsewhere, revealed the lack of degradation impacts on TEC stocks, and demonstrated the effectiveness of restoration on TEC stocks after only 25 years. Our gridded sampling approach was able to capture spatial variability across Cambodia and provide a more realistic TEC stock information that can be used for national reporting or participation in C markets.
Sahadev Sharma; Richard A. MacKenzie; Thida Tieng; Kim Soben; Natcha Tulyasuwan; Amomwan Resanond; Geoffrey Blate; Creighton M. Litton. The impacts of degradation, deforestation and restoration on mangrove ecosystem carbon stocks across Cambodia. Science of The Total Environment 2019, 706, 135416 .
AMA StyleSahadev Sharma, Richard A. MacKenzie, Thida Tieng, Kim Soben, Natcha Tulyasuwan, Amomwan Resanond, Geoffrey Blate, Creighton M. Litton. The impacts of degradation, deforestation and restoration on mangrove ecosystem carbon stocks across Cambodia. Science of The Total Environment. 2019; 706 ():135416.
Chicago/Turabian StyleSahadev Sharma; Richard A. MacKenzie; Thida Tieng; Kim Soben; Natcha Tulyasuwan; Amomwan Resanond; Geoffrey Blate; Creighton M. Litton. 2019. "The impacts of degradation, deforestation and restoration on mangrove ecosystem carbon stocks across Cambodia." Science of The Total Environment 706, no. : 135416.
Kangkuso Analuddin; Andi Septiana; Nasaruddin; Yusuf Sabilu; Sahadev Sharma. Mangrove Fruit Bioprospecting: Nutritional and Antioxidant Potential as a Food Source for Coastal Communities in the Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia. International Journal of Fruit Science 2019, 19, 423 -436.
AMA StyleKangkuso Analuddin, Andi Septiana, Nasaruddin, Yusuf Sabilu, Sahadev Sharma. Mangrove Fruit Bioprospecting: Nutritional and Antioxidant Potential as a Food Source for Coastal Communities in the Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia. International Journal of Fruit Science. 2019; 19 (4):423-436.
Chicago/Turabian StyleKangkuso Analuddin; Andi Septiana; Nasaruddin; Yusuf Sabilu; Sahadev Sharma. 2019. "Mangrove Fruit Bioprospecting: Nutritional and Antioxidant Potential as a Food Source for Coastal Communities in the Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia." International Journal of Fruit Science 19, no. 4: 423-436.
This study was conducted to quantify and compare the above- and belowground biomass, litterfall and net primary productivity of three mangrove species in the family Rhizophoraceae: Bruguiera gymnorrhiza, Kandelia obovata, and Rhizophora stylosa, in Manko Wetland, Okinawa Island, Japan. A total of thirty five plots were monitored over five years. The studied mangrove stands of all three species were mostly dominated by a large number of small sized trees. Total above-ground biomass of B. gymnorrhiza, K. obovata, and R. stylosa was 64.9,111.6, and 208.290.6 Mg ha−1, respectively. There was no significant difference in AGB between B. gymnorrhiza and K. obovata, but AGB of both of these species differed significantly from that of R. stylosa. Similarly, there was no significant difference in total BGB between B. gymnorrhiza and R. stylosa, but BGB of both of these species differed significantly from that of K. obovata AGB and BGB of K. obovata increased with increasing basal area of this species. On the other hand, in case of AGB and BGB of B. gymnorrhiza and R. stylosa, it did not show any relationship with basal area of the respective species. The average annual rate of above-ground biomass increment was 15.7 Mg ha−1 yr−1 in the R. stylosa stands. Hence, R. stylosa stands recored a higher AGNPP (43.8 Mg ha−1 yr−1) than B. gymnorrhiza (17.7 Mg ha−1 yr−1) and K. obovata (22.3 Mg ha−1 yr−1). Annual total litterfall rates for B. gymnorrhiza, K. obovata, and R. stylosa during the five-year period was 10.1, 9.9, and 12.3 Mg ha−1 yr−1, respectively. The annual rate of NPP in the R. stylosa stands was greater than that of two other species. R. stylosa was the most productive tree in the mangroves of Manko Wetland area in terms of dry matter production.
Kamruzzaman; Kamara Mouctar; Sahadev Sharma; Akira Osawa. Comparison of biomass and net primary productivity among three species in a subtropical mangrove forest at Manko Wetland, Okinawa, Japan. Regional Studies in Marine Science 2018, 25, 100475 .
AMA StyleKamruzzaman, Kamara Mouctar, Sahadev Sharma, Akira Osawa. Comparison of biomass and net primary productivity among three species in a subtropical mangrove forest at Manko Wetland, Okinawa, Japan. Regional Studies in Marine Science. 2018; 25 ():100475.
Chicago/Turabian StyleKamruzzaman; Kamara Mouctar; Sahadev Sharma; Akira Osawa. 2018. "Comparison of biomass and net primary productivity among three species in a subtropical mangrove forest at Manko Wetland, Okinawa, Japan." Regional Studies in Marine Science 25, no. : 100475.
Sahadev Sharma. Introductory Chapter: Mangrove Ecosystem Research Trends - Where has the Focus been So Far. Mangrove Ecosystem Ecology and Function 2018, 1 .
AMA StyleSahadev Sharma. Introductory Chapter: Mangrove Ecosystem Research Trends - Where has the Focus been So Far. Mangrove Ecosystem Ecology and Function. 2018; ():1.
Chicago/Turabian StyleSahadev Sharma. 2018. "Introductory Chapter: Mangrove Ecosystem Research Trends - Where has the Focus been So Far." Mangrove Ecosystem Ecology and Function , no. : 1.
This study aims to establish allometric models and estimate aboveground biomass (AGB) of mangroves Rhizophoraceae in the Southeast Sulawesi, Indonesia. Allometric models of the AGB of mangroves Rhizophora apiculata, R. mucronata, and Ceriops tagal were established using independent variables consisting stem diameter at 30 cm from the ground (D30), diameter at breast height (DBH), D302H and DBH2H. The AGB of mangroves was estimated by applying allometric model and tree census. The results showed that the best fitting allometric models of AGB for R. apiculata is based on variable DBH, while DBH2H is the best variable for R. mucronata trees. Conversely, the D30 is the best variable for estimating AGB of C. tagal trees. Thus, there is some variation of independent variables on allometric models for the estimation of AGB for Rhizophoraceae mangroves. The AGB (ton ha−1) of R. apiculata, R. mucronata, and C. tagal was estimated respective 651.60, 232.11 and 154.56 in the protected area, and respective 137.59, 189.35 and 39.06 ton ha−1 in the unprotected area. Higher AGB of mangroves growing in the protected area indicated the suitable condition and undisturbed by human activities. The conservation of mangroves is necessary for the sustainability of mangroves and coastal ecosystems in the Coral Triangle ecoregion.
Analuddin Kangkuso; Sahadev Sharma; Jamili Jamili; Andi Septiana; Idin Sahidin; Usman Rianse; Saban Rahim; Kazuo Nadaoka. Trends in allometric models and aboveground biomass of familyRhizophoraceaemangroves in the Coral Triangle ecoregion, Southeast Sulawesi, Indonesia. Journal of Sustainable Forestry 2018, 37, 691 -711.
AMA StyleAnaluddin Kangkuso, Sahadev Sharma, Jamili Jamili, Andi Septiana, Idin Sahidin, Usman Rianse, Saban Rahim, Kazuo Nadaoka. Trends in allometric models and aboveground biomass of familyRhizophoraceaemangroves in the Coral Triangle ecoregion, Southeast Sulawesi, Indonesia. Journal of Sustainable Forestry. 2018; 37 (7):691-711.
Chicago/Turabian StyleAnaluddin Kangkuso; Sahadev Sharma; Jamili Jamili; Andi Septiana; Idin Sahidin; Usman Rianse; Saban Rahim; Kazuo Nadaoka. 2018. "Trends in allometric models and aboveground biomass of familyRhizophoraceaemangroves in the Coral Triangle ecoregion, Southeast Sulawesi, Indonesia." Journal of Sustainable Forestry 37, no. 7: 691-711.
The Philippines has lost nearly 70% of its natural mangrove cover since the early 1900s. As a result, large investments have been made to restore mangrove forests and the many ecosystem services that they provide. Most of these restoration efforts have been through outplanting of Rhizophora sp. seedlings, many of which have failed because the proper hydrological and ecological conditions were not properly assessed. Other afforestation projects involved planting seedlings in inappropriate places (e.g., seagrass beds, mudflats) that resulted in replacing one valuable ecosystem with another. The aim of this research was to investigate the growth of 3-, 9-, and 21-year-old afforested stands of Rhizophora spp. mangrove forest. We also investigated the impact of these plantations on local seagrass beds. The total aboveground biomass was 42.6, 74.4, and 111.7 Mg ha−1 for the 3-, 9-, and 21-year-old mangrove stands, respectively. Seagrass bed cover decreased under the closed canopy of the mangrove due to reduced photosynthetically active radiation and competition for growing space. This study shows that mangroves can grow to some extent on seagrass beds, though mangrove planting in these areas could eventually lead to seagrass loss. Thus, mangroves should not be planted in areas that are naturally occupied by other ecologically important ecosystems. The purpose of mangrove restoration should be clear and efforts should be focused on formerly deforested or degraded areas. Additional studies are needed from different locations to understand how mangrove planting in seagrass beds impacts growth performance and ecological functions of the latter ecosystem.
Sahadev Sharma; Kazuo Nadaoka; Masahiro Nakaoka; Wilfredo H. Uy; Richard A. MacKenzie; Daniel A. Friess; Miguel D. Fortes. Growth performance and structure of a mangrove afforestation project on a former seagrass bed, Mindanao Island, Philippines. Hydrobiologia 2017, 803, 359 -371.
AMA StyleSahadev Sharma, Kazuo Nadaoka, Masahiro Nakaoka, Wilfredo H. Uy, Richard A. MacKenzie, Daniel A. Friess, Miguel D. Fortes. Growth performance and structure of a mangrove afforestation project on a former seagrass bed, Mindanao Island, Philippines. Hydrobiologia. 2017; 803 (1):359-371.
Chicago/Turabian StyleSahadev Sharma; Kazuo Nadaoka; Masahiro Nakaoka; Wilfredo H. Uy; Richard A. MacKenzie; Daniel A. Friess; Miguel D. Fortes. 2017. "Growth performance and structure of a mangrove afforestation project on a former seagrass bed, Mindanao Island, Philippines." Hydrobiologia 803, no. 1: 359-371.
Kamruzzaman; Akira Osawa; Rashila Deshar; Sahadev Sharma; Kamara Mouctar. Species composition, biomass, and net primary productivity of mangrove forest in Okukubi River, Okinawa Island, Japan. Regional Studies in Marine Science 2017, 12, 19 -27.
AMA StyleKamruzzaman, Akira Osawa, Rashila Deshar, Sahadev Sharma, Kamara Mouctar. Species composition, biomass, and net primary productivity of mangrove forest in Okukubi River, Okinawa Island, Japan. Regional Studies in Marine Science. 2017; 12 ():19-27.
Chicago/Turabian StyleKamruzzaman; Akira Osawa; Rashila Deshar; Sahadev Sharma; Kamara Mouctar. 2017. "Species composition, biomass, and net primary productivity of mangrove forest in Okukubi River, Okinawa Island, Japan." Regional Studies in Marine Science 12, no. : 19-27.
Kamruzzaman; Akira Osawa; Kamara Mouctar; Sahadev Sharma. Comparative reproductive phenology of subtropical mangrove communities at Manko Wetland, Okinawa Island, Japan. Journal of Forest Research 2017, 22, 118 -125.
AMA StyleKamruzzaman, Akira Osawa, Kamara Mouctar, Sahadev Sharma. Comparative reproductive phenology of subtropical mangrove communities at Manko Wetland, Okinawa Island, Japan. Journal of Forest Research. 2017; 22 (2):118-125.
Chicago/Turabian StyleKamruzzaman; Akira Osawa; Kamara Mouctar; Sahadev Sharma. 2017. "Comparative reproductive phenology of subtropical mangrove communities at Manko Wetland, Okinawa Island, Japan." Journal of Forest Research 22, no. 2: 118-125.
Analuddin K, Septiana A, Sharma S, Hagihara A. 2016. Crown shape dynamics of dense mangrove Kandelia obovata standsin Manko Wetland, Okinawa Island, Japan. Biodiversitas 17: 865-872. The objectives of this study were to elucidate the crown structure dynamics for dense mangrove stands, and to know the crown shape maintenances and its important role for ensuring the stability and vitality the crowded mangrove forest. The growth parameters of K. obovata Shue, Liu & Yong stands, such as tree height H (m), height at the lowest living leaves HL (m), crown length CL (m) and crown width CW (m), were measured in the summer from 2004 to 2008. The crown shape dynamics were analyzed. The results showed that the HL was significantly increased with increasing H, which suggests thatthe crown changed to be dumpy as the stands grew. However, the CL of young stands increased and then decreased continuously as the stands grew, while the CL of mature stands decreased from 2004 to 2007 and then increased in 2008. Meanwhile, the CL/CW ratio of young stands decreased as the stands grew, while the CL/CW ratio of mature stands decreased and then increased, which imply that dense Kandelia obovata trees might transform their crown shape for reducing of competition for light among trees. Therefore, these resultssuggested that the crown shape of dense mangrove treesare dynamics as developing stands.
Kangkuso Analuddin; Andi Septiana; Sahadev Sharma; Akio Hagihara. Crown shape dynamics of dense mangrove Kandelia obovata stands in Manko Wetland, Okinawa Island, Japan. Biodiversitas Journal of Biological Diversity 2016, 17, 1 .
AMA StyleKangkuso Analuddin, Andi Septiana, Sahadev Sharma, Akio Hagihara. Crown shape dynamics of dense mangrove Kandelia obovata stands in Manko Wetland, Okinawa Island, Japan. Biodiversitas Journal of Biological Diversity. 2016; 17 (2):1.
Chicago/Turabian StyleKangkuso Analuddin; Andi Septiana; Sahadev Sharma; Akio Hagihara. 2016. "Crown shape dynamics of dense mangrove Kandelia obovata stands in Manko Wetland, Okinawa Island, Japan." Biodiversitas Journal of Biological Diversity 17, no. 2: 1.
We evaluated the phenology and litterfall dynamics of the mangrove Bruguiera gymnorrhiza (L.) Lamk along the Okukubi River, Okinawa Island, Japan. Over 3 years, this species showed the highest litterfall of leaves and stipules in summer and the lowest litterfall in winter. From Kendall’s coefficient of concordance, the monthly changes in leaf, stipule, and branch were strongly and significantly concordant among years. Leaf and stipule litterfall could be governed by monthly maximum wind speed, monthly day length, and monthly mean air temperature. Branch litterfall depended on monthly maximum wind speed and monthly rainfall, and increased exponentially with increasing monthly maximum wind speed. Mean total litterfall was 11.8 Mg ha−1 yr−1, with the largest component being leaf litterfall (65.8 %). Annual leaf litterfall per plot was almost constant regardless of the tree density of the plot. Mean leaf longevity was 18 months. Flower and mature propagule litterfall might be influenced by monthly mean air temperature, monthly day length and monthly mean air temperature. The average development periods from flower buds to flowers and flower buds to mature propagules were 1 and 8 months, respectively. Except for leaf and branch, all vegetative and reproductive organ litterfall had clear annual cycles. B. gymnorrhiza showed a positive correlation between leaf production and reproductive organ production.
Kamruzzaman; Mouctar Kamara; Sahadev Sharma; Akio Hagihara. Stand structure, phenology and litterfall dynamics of a subtropical mangrove Bruguiera gymnorrhiza. Journal of Forestry Research 2015, 27, 513 -523.
AMA StyleKamruzzaman, Mouctar Kamara, Sahadev Sharma, Akio Hagihara. Stand structure, phenology and litterfall dynamics of a subtropical mangrove Bruguiera gymnorrhiza. Journal of Forestry Research. 2015; 27 (3):513-523.
Chicago/Turabian StyleKamruzzaman; Mouctar Kamara; Sahadev Sharma; Akio Hagihara. 2015. "Stand structure, phenology and litterfall dynamics of a subtropical mangrove Bruguiera gymnorrhiza." Journal of Forestry Research 27, no. 3: 513-523.
Analuddin Kangkuso; Jamili Jamili; Andi Septiana; Rasas Raya; Idin Sahidin; Usman Rianse; Saban Rahim; Alfirman Alfirman; Sahadev Sharma; Kazuo Nadaoka. Allometric models and aboveground biomass of Lumnitzera racemosa Willd. forest in Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia. Forest Science and Technology 2015, 12, 43 -50.
AMA StyleAnaluddin Kangkuso, Jamili Jamili, Andi Septiana, Rasas Raya, Idin Sahidin, Usman Rianse, Saban Rahim, Alfirman Alfirman, Sahadev Sharma, Kazuo Nadaoka. Allometric models and aboveground biomass of Lumnitzera racemosa Willd. forest in Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia. Forest Science and Technology. 2015; 12 (1):43-50.
Chicago/Turabian StyleAnaluddin Kangkuso; Jamili Jamili; Andi Septiana; Rasas Raya; Idin Sahidin; Usman Rianse; Saban Rahim; Alfirman Alfirman; Sahadev Sharma; Kazuo Nadaoka. 2015. "Allometric models and aboveground biomass of Lumnitzera racemosa Willd. forest in Rawa Aopa Watumohai National Park, Southeast Sulawesi, Indonesia." Forest Science and Technology 12, no. 1: 43-50.
Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliage in order to understand the productivity of mangroves, which play an important role in the subtropical and tropical coastlines of the world.
Sahadev Sharma; A T M Rafiqul Hoque; Kangkuso Analuddin; Akio Hagihara. A model of seasonal foliage dynamics of the subtropical mangrove species Rhizophora stylosa Griff. growing at the northern limit of its distribution. Forest Ecosystems 2014, 1, 15 .
AMA StyleSahadev Sharma, A T M Rafiqul Hoque, Kangkuso Analuddin, Akio Hagihara. A model of seasonal foliage dynamics of the subtropical mangrove species Rhizophora stylosa Griff. growing at the northern limit of its distribution. Forest Ecosystems. 2014; 1 (1):15.
Chicago/Turabian StyleSahadev Sharma; A T M Rafiqul Hoque; Kangkuso Analuddin; Akio Hagihara. 2014. "A model of seasonal foliage dynamics of the subtropical mangrove species Rhizophora stylosa Griff. growing at the northern limit of its distribution." Forest Ecosystems 1, no. 1: 15.
The vegetative and reproductive phenology of the subtropical mangrove species Rhizophora stylosa was investigated at Manko Wetland, Okinawa Island, Japan. We assessed phenology using litterfall data over four years. Leaf and stipule litterfall occurred throughout the year, with distinct seasonal patterns. Kendall’s coefficient of concordance, W, revealed that the monthly changes in leaf and stipule litterfall were strongly and significantly concordant among years. Leaf litterfall was significantly correlated with monthly maximum wind speed and monthly day length, and stipule litterfall was significantly correlated with monthly mean air temperature and relative humidity. Branch litterfall showed no clear monthly pattern and correlated well with monthly maximum wind speed. Mean total litterfall was 11.2 Mg ha−1 year−1, with the largest component being vegetative organs (78.7 %). Flower, fruit, and propagule litterfall were all highest in summer and lowest in winter. The W values revealed that most reproductive organs in litterfall had significant monthly trends. Flower and fruit litterfall were significantly correlated with monthly day length and monthly mean air temperature, respectively. The average development periods from flower buds to flowers, fruits, and mature propagules were approximately 2–3 months, 4–5 months, and 11–12 months, respectively. Except for branches, all vegetative and reproductive components of litterfall had approximately one year cycles.
Kamruzzaman; Sahadev Sharma; Mouctar Kamara; Akio Hagihara. Phenological traits of the mangrove Rhizophora stylosa Griff. at the northern limit of its biogeographical distribution. Wetlands Ecology and Management 2013, 21, 277 -288.
AMA StyleKamruzzaman, Sahadev Sharma, Mouctar Kamara, Akio Hagihara. Phenological traits of the mangrove Rhizophora stylosa Griff. at the northern limit of its biogeographical distribution. Wetlands Ecology and Management. 2013; 21 (4):277-288.
Chicago/Turabian StyleKamruzzaman; Sahadev Sharma; Mouctar Kamara; Akio Hagihara. 2013. "Phenological traits of the mangrove Rhizophora stylosa Griff. at the northern limit of its biogeographical distribution." Wetlands Ecology and Management 21, no. 4: 277-288.
Information on mangrove stand development is rare because long-term monitoring data is often lacking. Such information is important in order to plan management measures effectively. Novel approaches based on existing datasets are required to bridge this gap of knowledge. This study uses a unique combination of field data analyses with simulation experiments in order to demonstrate how information on mangrove dynamics can be extracted if data are sparse. The paper provides a baseline characterization of stand development in a monospecific pioneer mangrove stand of Kandelia obovata. Point pattern analyses revealed that in the young stage, self-thinning has started but has not yet lead to a regularity of spatial tree distribution in the entire stand, and trees located in smaller clumps hinder each other in growth but do not lead to a significant size class differentiation. However, after ca. 2 decades the self-thinning and the size class differentiation start to become more visible. A mutual inhibition of growth was observed within 2 m circular distance (r) in the young stage and within 3 m distance after two decades of stand development as confirmed by the negative values of mark correlation function. As a stand grows older the spatial pattern of individuals become more regular from a clustered pattern. In order to understand and predict the future stand development, simulation experiments were carried out by means of the individual-based model KiWi.
Nabiul Islam Khan; Sahadev Sharma; Uta Berger; Nico Koedam; Farid Dahdouh-Guebas; Akio A. Hagihara. How do tree competition and stand dynamics lead to spatial patterns in monospecific mangroves? Biogeosciences 2013, 10, 2803 -2814.
AMA StyleNabiul Islam Khan, Sahadev Sharma, Uta Berger, Nico Koedam, Farid Dahdouh-Guebas, Akio A. Hagihara. How do tree competition and stand dynamics lead to spatial patterns in monospecific mangroves? Biogeosciences. 2013; 10 (4):2803-2814.
Chicago/Turabian StyleNabiul Islam Khan; Sahadev Sharma; Uta Berger; Nico Koedam; Farid Dahdouh-Guebas; Akio A. Hagihara. 2013. "How do tree competition and stand dynamics lead to spatial patterns in monospecific mangroves?" Biogeosciences 10, no. 4: 2803-2814.
Vegetative and reproductive phenology of the subtropical mangrove Bruguieragymnorrhiza was investigated at Manko Wetland, Okinawa Island, Japan. Phenology was assessed using litterfall data over 4 years. Leaf and stipule litterfall occurred throughout the year, with distinct seasonal patterns. Kendall’s coefficient of concordance, W, revealed that the monthly changes in leaf and stipule litterfall were strongly and significantly concordant among years. Leaf litterfall was linked to monthly day length and maximum wind speed, and stipule litterfall was linked to monthly mean air temperature, monthly rainfall, and maximum wind speed. Branch litterfall showed no clear monthly pattern, but tended to vary with monthly maximum wind speed. Mean leaf longevity was 19 months. Mean total litterfall was 10.1 Mg ha−1 year−1, with the largest component being vegetative organs (58 %). Flower and propagule litterfall were highest in autumn and summer, respectively, and lowest in winter. The W values revealed that, of the reproductive organs, only flower litterfall had a significant monthly trend. Flower litterfall was correlated with monthly mean air temperature and relative humidity. The average development periods from flower buds to flowers and from flowers to mature propagules were approximately 1 and 8 months, respectively. It took 9 months to produce mature propagules from flower buds. Except for branches, all vegetative and reproductive components of litterfall had clear annual cycles.
Kamruzzaman; Sahadev Sharma; Mouctar Kamara; Akio Hagihara. Vegetative and reproductive phenology of the mangrove Bruguiera gymnorrhiza (L.) Lam. on Okinawa Island, Japan. Trees 2012, 27, 619 -628.
AMA StyleKamruzzaman, Sahadev Sharma, Mouctar Kamara, Akio Hagihara. Vegetative and reproductive phenology of the mangrove Bruguiera gymnorrhiza (L.) Lam. on Okinawa Island, Japan. Trees. 2012; 27 (3):619-628.
Chicago/Turabian StyleKamruzzaman; Sahadev Sharma; Mouctar Kamara; Akio Hagihara. 2012. "Vegetative and reproductive phenology of the mangrove Bruguiera gymnorrhiza (L.) Lam. on Okinawa Island, Japan." Trees 27, no. 3: 619-628.
Sahadev Sharma; Kamruzzaman; A. T. M. Rafiqul Hoque; Akio Hagihara. Leaf phenological traits and leaf longevity of three mangrove species (Rhizophoraceae) on Okinawa Island, Japan. Journal of Oceanography 2012, 68, 831 -840.
AMA StyleSahadev Sharma, Kamruzzaman, A. T. M. Rafiqul Hoque, Akio Hagihara. Leaf phenological traits and leaf longevity of three mangrove species (Rhizophoraceae) on Okinawa Island, Japan. Journal of Oceanography. 2012; 68 (6):831-840.
Chicago/Turabian StyleSahadev Sharma; Kamruzzaman; A. T. M. Rafiqul Hoque; Akio Hagihara. 2012. "Leaf phenological traits and leaf longevity of three mangrove species (Rhizophoraceae) on Okinawa Island, Japan." Journal of Oceanography 68, no. 6: 831-840.