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Dr. Aaron Koning
Department of Biology and Global Water Center, University of Nevada, Reno, NV, USA

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0 Aquatic Ecology
0 Conservation Biology
0 Ecosystem Ecology
0 Electrofishing
0 Freshwater Ecology

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Journal article
Published: 09 July 2021 in Water
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The Tonle Sap Lake and River ecosystem in the Lower Mekong Basin of Southeast Asia is one of the most productive inland fisheries globally but is currently threatened by overfishing, dam construction, and climate change. We compare the catch composition and amount from 2007–2013 of two fishery gear types, the bagnets of the largest commercial fishery, the Dai fishery, and gillnets, which are deployed ubiquitously by independent fishers. We found that the two methods captured a similar number of genera (81 and 88 in the Dai and gillnet). Catches of both fisheries were dominated (>75%) by three genera that migrate longitudinally, Henicorhynchus, Labiobarbus, and Paralaubuca. The catch of the Dai fishery followed annual variation in the flood pulse extent, but the gillnet catch did not. We used resource selection ratios to quantify selection pressure by the gillnet fishery, relative to the Dai fishery, on fish from different genera and trait groups. The gillnet selected for fish that migrate laterally from the floodplain to the main river and for higher trophic level fish. Gillnets may target groups of fish that are less impacted by the long-standing Dai fishery. For both fisheries, we note a need for monitoring fish lengths in order to understand the effects of selection on population dynamics and species-specific trait changes.

ACS Style

Suzanne Kelson; Zeb Hogan; Christopher Jerde; Sudeep Chandra; Peng Ngor; Aaron Koning. Fishing Methods Matter: Comparing the Community and Trait Composition of the Dai (Bagnet) and Gillnet Fisheries in the Tonle Sap River in Southeast Asia. Water 2021, 13, 1904 .

AMA Style

Suzanne Kelson, Zeb Hogan, Christopher Jerde, Sudeep Chandra, Peng Ngor, Aaron Koning. Fishing Methods Matter: Comparing the Community and Trait Composition of the Dai (Bagnet) and Gillnet Fisheries in the Tonle Sap River in Southeast Asia. Water. 2021; 13 (14):1904.

Chicago/Turabian Style

Suzanne Kelson; Zeb Hogan; Christopher Jerde; Sudeep Chandra; Peng Ngor; Aaron Koning. 2021. "Fishing Methods Matter: Comparing the Community and Trait Composition of the Dai (Bagnet) and Gillnet Fisheries in the Tonle Sap River in Southeast Asia." Water 13, no. 14: 1904.

Journal article
Published: 26 June 2021 in Water
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Environmental DNA (eDNA) metabarcoding approaches to surveillance have great potential for advancing biodiversity monitoring and fisheries management. For eDNA metabarcoding, having a genetic reference sequence identified to fish species is vital to reduce detection errors. Detection errors will increase when there is no reference sequence for a species or when the reference sequence is the same between different species at the same sequenced region of DNA. These errors will be acute in high biodiversity systems like the Mekong River Basin, where many fish species have no reference sequences and many congeners have the same or very similar sequences. Recently developed tools allow for inspection of reference database coverage and the sequence similarity between species. These evaluation tools provide a useful pre-deployment approach to evaluate the breadth of fish species richness potentially detectable using eDNA metabarcoding. Here we combined established species lists for the Mekong River Basin, resulting in a list of 1345 fish species, evaluated the genetic library coverage across 23 peer-reviewed primer pairs, and measured the species specificity for one primer pair across four genera to demonstrate that coverage of genetic reference libraries is but one consideration before deploying an eDNA metabarcoding surveillance program. This analysis identifies many of the eDNA metabarcoding knowledge gaps with the aim of improving the reliability of eDNA metabarcoding applications in the Mekong River Basin. Genetic reference libraries perform best for common and commercially valuable Mekong fishes, while sequence coverage does not exist for many regional endemics, IUCN data deficient, and threatened fishes.

ACS Style

Christopher Jerde; Andrew Mahon; Teresa Campbell; Mary McElroy; Kakada Pin; Jasmine Childress; Madeline Armstrong; Jessica Zehnpfennig; Suzanne Kelson; Aaron Koning; Peng Ngor; Vanna Nuon; Nam So; Sudeep Chandra; Zeb Hogan. Are Genetic Reference Libraries Sufficient for Environmental DNA Metabarcoding of Mekong River Basin Fish? Water 2021, 13, 1767 .

AMA Style

Christopher Jerde, Andrew Mahon, Teresa Campbell, Mary McElroy, Kakada Pin, Jasmine Childress, Madeline Armstrong, Jessica Zehnpfennig, Suzanne Kelson, Aaron Koning, Peng Ngor, Vanna Nuon, Nam So, Sudeep Chandra, Zeb Hogan. Are Genetic Reference Libraries Sufficient for Environmental DNA Metabarcoding of Mekong River Basin Fish? Water. 2021; 13 (13):1767.

Chicago/Turabian Style

Christopher Jerde; Andrew Mahon; Teresa Campbell; Mary McElroy; Kakada Pin; Jasmine Childress; Madeline Armstrong; Jessica Zehnpfennig; Suzanne Kelson; Aaron Koning; Peng Ngor; Vanna Nuon; Nam So; Sudeep Chandra; Zeb Hogan. 2021. "Are Genetic Reference Libraries Sufficient for Environmental DNA Metabarcoding of Mekong River Basin Fish?" Water 13, no. 13: 1767.

Research communications
Published: 19 January 2021 in Frontiers in Ecology and the Environment
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Intensive fishing is altering the functioning of aquatic ecosystems worldwide, threatening both biodiversity and food security. No‐fishing reserves have proven effective at restoring food‐web structure and enhancing fisheries in marine ecosystems, but remain virtually untested in freshwater systems. Using experiments inside and outside of community‐created riverine reserves in Thailand, we describe a trophic cascade across six trophic levels, from humans to algal responses to nutrient availability. Protection from fishing profoundly reconfigures fish communities – greatly increasing biodiversity, biomass, and body size – yet mean trophic position was unaffected. Cascade dynamics from fish to algae were observed regardless of protection status, although fishing intensified trophic interactions through strong effects on grazing insect behavior. The marked effectiveness of these small, grassroots reserves offers an important conservation‐planning model for protecting food webs and augmenting fishery yields in biodiverse tropical rivers.

ACS Style

Aaron A Koning; Peter B McIntyre. Grassroots reserves rescue a river food web from cascading impacts of overharvest. Frontiers in Ecology and the Environment 2021, 19, 152 -158.

AMA Style

Aaron A Koning, Peter B McIntyre. Grassroots reserves rescue a river food web from cascading impacts of overharvest. Frontiers in Ecology and the Environment. 2021; 19 (3):152-158.

Chicago/Turabian Style

Aaron A Koning; Peter B McIntyre. 2021. "Grassroots reserves rescue a river food web from cascading impacts of overharvest." Frontiers in Ecology and the Environment 19, no. 3: 152-158.

Journal article
Published: 25 November 2020 in Nature
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Intensive fisheries have reduced fish biodiversity and abundance in aquatic ecosystems worldwide1–3. ‘No-take’ marine reserves have become a cornerstone of marine ecosystem-based fisheries management4–6, and their benefits for adjacent fisheries are maximized when reserve design fosters synergies among nearby reserves7,8. The applicability of this marine reserve network paradigm to riverine biodiversity and inland fisheries remains largely untested. Here we show that reserves created by 23 separate communities in Thailand’s Salween basin have markedly increased fish richness, density, and biomass relative to adjacent areas. Moreover, key correlates of the success of protected areas in marine ecosystems—particularly reserve size and enforcement—predict differences in ecological benefits among riverine reserves. Occupying a central position in the network confers additional gains, underscoring the importance of connectivity within dendritic river systems. The emergence of network-based benefits is remarkable given that these reserves are young (less than 25 years old) and arose without formal coordination. Freshwater ecosystems are under-represented among the world’s protected areas9, and our findings suggest that networks of small, community-based reserves offer a generalizable model for protecting biodiversity and augmenting fisheries as the world’s rivers face unprecedented pressures10,11. A network of small, community-run river reserves in Thailand increases local fish biomass, diversity and richness.

ACS Style

Aaron A. Koning; K. Martin Perales; Etienne Fluet-Chouinard; Peter B. McIntyre. A network of grassroots reserves protects tropical river fish diversity. Nature 2020, 588, 631 -635.

AMA Style

Aaron A. Koning, K. Martin Perales, Etienne Fluet-Chouinard, Peter B. McIntyre. A network of grassroots reserves protects tropical river fish diversity. Nature. 2020; 588 (7839):631-635.

Chicago/Turabian Style

Aaron A. Koning; K. Martin Perales; Etienne Fluet-Chouinard; Peter B. McIntyre. 2020. "A network of grassroots reserves protects tropical river fish diversity." Nature 588, no. 7839: 631-635.