Species‐specific phenological trends in shallow Pampean lakes’ (Argentina) zooplankton driven by contemporary climate change in the Southern Hemisphere

• DOI: 10.1111/gcb.14423
• Publication Date: 2018-08-16T06:48:27Z
• Authors: Nadia Diovisalvi; Mariana Odriozola; Javier Garcia de ...; Florencia Rojas M...; María S. Fontanar...; Roberto Escaray; José Bustingorry; Pablo Sanzano; Fabián Grosman; Horacio Zagarese
• Keywords: Lake ecosystem

The relationship between the timing of recurrent biological events and seasonal climatic patterns (i.e., phenology) is a crucial ecological process. Changes in phenology are increasingly linked to global climate change. However, current evidence phenological responses recent change subjected substantial regional biases. Most available on climate-driven changes comes from Northern Hemisphere (NH) ecosystems typically involves increases spring summer temperatures, which translate into earlier onsets population developments. In Argentine Pampa region, warming has occurred at much slower pace than NH, trends mostly restricted minimum temperatures. We used zooplankton abundance data Lake Chascomús (recorded every two weeks 2005 2015) evaluate potential phenology. adopted sequential screening approach identify taxa displaying evaluated whether such could be associated observe long-term water temperature. Two species displayed significant later shifts metrics (end date Brachionus havanaensis distribution: 31 day/decade, onset end dates Keratella americana 59 day/decade 82 respectively). observed shift B. was coincident with trend May lake temperature (4.7°C per decade). Analysis versus six additional shallow Pampean lakes, evaluation previous experimental results, provided further that responsible for delayed decline populations autumn. This study first report freshwater Southern (SH).