This page has only limited features, please log in for full access.
The last 85,000 years were characterized by high climate and environmental variability on the Yucatán Peninsula. Heinrich stadials are examples of abrupt climate transitions that involved shifts in regional temperatures and moisture availability. Thus, they serve as natural experiments to evaluate the contrasting responses of aquatic and terrestrial ecosystems. We used ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6, ~85 ka) recovered from Lake Petén Itzá, Guatemala, to assess the magnitude and velocity of community responses. Ostracodes are sensitive to changes in water temperature and conductivity. Vegetation responds to shifts in temperature and the ratio of evaporation to precipitation. Ostracodes display larger and more rapid community changes than does vegetation. Heinrich Stadial 5-1 (HS5-1) was cold and dry and is associated with lower ostracode and vegetation species richness and diversity. In contrast, the slightly warmer and dry conditions during HS6 and HS5a are reflected in higher ostracode species richness and diversity. Our paleoecological study revealed the greatest ecological turnover for ostracodes occurred from 62.5 to 51.0 ka; for pollen, it was at the Pleistocene/Holocene transition. Future studies should use various climate and environmental indicators from lake and marine sediment records to further explore late glacial paleoclimate causes and effects in the northern neotropics.
Liseth Pérez; Alex Correa-Metrio; Sergio Cohuo; Laura Macario González; Paula Echeverría-Galindo; Mark Brenner; Jason Curtis; Steffen Kutterolf; Mona Stockhecke; Frederik Schenk; Thorsten Bauersachs; Antje Schwalb. Ecological turnover in neotropical freshwater and terrestrial communities during episodes of abrupt climate change. Quaternary Research 2021, 101, 26 -36.
AMA StyleLiseth Pérez, Alex Correa-Metrio, Sergio Cohuo, Laura Macario González, Paula Echeverría-Galindo, Mark Brenner, Jason Curtis, Steffen Kutterolf, Mona Stockhecke, Frederik Schenk, Thorsten Bauersachs, Antje Schwalb. Ecological turnover in neotropical freshwater and terrestrial communities during episodes of abrupt climate change. Quaternary Research. 2021; 101 ():26-36.
Chicago/Turabian StyleLiseth Pérez; Alex Correa-Metrio; Sergio Cohuo; Laura Macario González; Paula Echeverría-Galindo; Mark Brenner; Jason Curtis; Steffen Kutterolf; Mona Stockhecke; Frederik Schenk; Thorsten Bauersachs; Antje Schwalb. 2021. "Ecological turnover in neotropical freshwater and terrestrial communities during episodes of abrupt climate change." Quaternary Research 101, no. : 26-36.
The Yucatán Peninsula is a karstic region, rich in subterranean environments with a diverse crustacean stygobiont fauna. In order to gain insights into the biological evolution of the subterranean environments of this region, we evaluated the ostracode species composition of caves and cenotes in five independent sampling campaigns (2008, 2013, 2017–2019). Using morphometric analyses, we evaluated inter-population morphological variability; using molecular analysis based on mitochondrial COI and nuclear 18S rDNA, we evaluated genetic differentiation in selected species. The observed fauna is composed of 20 (epigean) species, presenting a lack of strict stygobionts. Morphometric analyses discriminated up to three morphotypes in each of the three most abundant species: Cytheridella ilosvayi, Alicenula sp. and Cypridopsis vidua. High intraspecific morphological variability was found either in shape or size. Phylogenetic analysis based on COI demonstrated the existence of three lineages on C. ilosvayi, with high support (>0.9). The 18S rDNA sequences were identical among individuals of different populations. A lack of congruence between the genetic markers precluded us from postulating speciation in subterranean environments. It is likely that Late Pleistocene—Early Holocene climate variation related to sea level and precipitation was forcing agent for epigean ostracode dominance in subterranean environments of the Peninsula.
Laura Macario-González; Sergio Cohuo; Dorottya Angyal; Liseth Pérez; Maite Mascaró. Subterranean Waters of Yucatán Peninsula, Mexico Reveal Epigean Species Dominance and Intraspecific Variability in Freshwater Ostracodes (Crustacea: Ostracoda). Diversity 2021, 13, 44 .
AMA StyleLaura Macario-González, Sergio Cohuo, Dorottya Angyal, Liseth Pérez, Maite Mascaró. Subterranean Waters of Yucatán Peninsula, Mexico Reveal Epigean Species Dominance and Intraspecific Variability in Freshwater Ostracodes (Crustacea: Ostracoda). Diversity. 2021; 13 (2):44.
Chicago/Turabian StyleLaura Macario-González; Sergio Cohuo; Dorottya Angyal; Liseth Pérez; Maite Mascaró. 2021. "Subterranean Waters of Yucatán Peninsula, Mexico Reveal Epigean Species Dominance and Intraspecific Variability in Freshwater Ostracodes (Crustacea: Ostracoda)." Diversity 13, no. 2: 44.