Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2019-235
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-235
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 09 Sep 2019

Submitted as: research article | 09 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Influence of late Quaternary climate on the biogeography of Neotropical aquatic species as reflected by non-marine ostracodes

Sergio Cohuo1,2, Laura Macario-Gonzalez1,3, Sebastian Wagner4, Katrin Naumann1, Paula Echeverria1, Liseth Pérez1, Jason Curtis5, Mark Brenner5, and Antje Schwalb1 Sergio Cohuo et al.
  • 1Institut für Geosysteme und Bioindikation, Technische Universität Braunschweig, Langer Kamp 19c, 38106 Braunschweig, Germany
  • 2Tecnológico Nacional de México/I. T. Chetumal. Av. Insurgentes 330, Chetumal, 77013 Quintana Roo, México
  • 3Tecnológico Nacional de México/I. T. de la Zona Maya. Carretera Chetumal-Escárcega Km 21.5, ejido Juan Sarabia, 77965 Quintana Roo, México
  • 4Helmholtz-Zentrum Geesthacht, Zentrum für Material-und Küstenforschung. Max-Planck-Straße 1, 21502 Geesthacht, Germany
  • 5Department of Geological Sciences, and Land Use and Environmental Change Institute, University of Florida, Gainesville, Florida, 32611, USA

Abstract. We evaluated how ranges of four endemic and non-endemic aquatic ostracode species changed in response to long-term (glacial-interglacial cycles) and abrupt climate fluctuations during the last 155 ka in the northern Neotropical region. We employed two complementary approaches, fossil records and species distribution modeling (SDM). Fossil assemblages were obtained from sediment cores PI-1, PI-2, PI-6 and Petén-Itzá 22-VIII-99 from Petén Itzá Scientific Drilling Project, Lake Petén Itzá, Guatemala. To obtain a spatially resolved pattern of (past) species distribution, a downscaling cascade is employed. SDM's were reconstructed for the Last Interglacial (~ 120 ka BP), the Last Glacial Maximum (~ 22 ka BP) and the middle Holocene (~ 6 ka BP). During glacial/interglacial cycles and Marine Isotope Stages, modeled paleo-distributions and paleo-records show nearly continuous presence of endemic and non-endemic species in the region, suggesting negligible effects of long-term climate variations on aquatic niche stability. During periods of abrupt ecological disruption such as Heinrich Stadial 1 (HS1), endemic species were resilient, remaining within their current areas of distribution. Non-endemic species, however, proved to be more sensitive. Modeled paleo-distributions suggest that the geographic range of non-endemic species changed, moving southward into Central America. Due to the uncertainties involved in the downscaling from the global numerical to the highly resolved regional geospatial statistical modelling, results can be seen as benchmark for future studies using similar approaches. Given relatively moderate temperature decreases in Lake Petén Itzá waters (~ 5 ºC) and persistence of some aquatic ecosystems even during periods of severe drying in HS1, our data suggest 1) existence of micro-refugia and/or 2) continuous interaction between central metapopulations and surrounding populations, enabling aquatic taxa to survive climate fluctuations in the northern Neotropical region.

Sergio Cohuo et al.
Interactive discussion
Status: open (until 21 Oct 2019)
Status: open (until 21 Oct 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Sergio Cohuo et al.
Sergio Cohuo et al.
Viewed  
Total article views: 110 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
92 17 1 110 3 0 0
  • HTML: 92
  • PDF: 17
  • XML: 1
  • Total: 110
  • Supplement: 3
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 09 Sep 2019)
Cumulative views and downloads (calculated since 09 Sep 2019)
Viewed (geographical distribution)  
Total article views: 93 (including HTML, PDF, and XML) Thereof 93 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 19 Sep 2019
Publications Copernicus
Download
Short summary
We evaluated how freshwater ostracode species responded to long-term and abrupt climate fluctuations during the last 155 ka in the northern Neotropical region. We used fossil records and species distribution modelling. Fossil evidence suggests negligible effects of long-term climate variations on aquatic niche stability. Models suggest that abrupt climate fluctuation forced species to migrate south to Central America. Microrefugia and metapopulations can explain the survival of endemic species.
We evaluated how freshwater ostracode species responded to long-term and abrupt climate...
Citation