Considering sub-basins in the spatio-temporal dynamics of lake food webs

TY - JOUR

T1 - Considering sub-basins in the spatio-temporal dynamics of lake food webs

AU - Borrelli, Jonathan J.

AU - Schuler, Matthew S.

AU - Hintz, William D.

AU - Mattes, Brian

AU - Schermerhorn, Candace

AU - Yates, Erika

AU - Eichler, Lawrence W.

AU - Lucius, Mark A.

AU - Ahrens, Laurie

AU - Relyea, Rick A.

N1 - Publisher Copyright: © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

PY - 2024/1

Y1 - 2024/1

N2 - The dynamics of populations in lake food webs are driven by a combination of spatial, environmental, and trophic processes. Differences among taxa in their ability to disperse and respond to the environment impact the food web and will be reflected in their abundances over time at different sites within a lake. The level of synchrony among lake sub-basins (within and across populations in a lake) is critical for determining the importance of spatial resolution when sampling and developing models. Using 7 years of survey data in Lake George, New York State (USA), we provide a high-level overview of changes in the densities of key food web groups over time (phytoplankton, zooplankton, and macroinvertebrates) and the synchrony of their dynamics among sub-basins. Phytoplankton biomass (measured as chlorophyll a) and zooplankton densities showed strong seasonal and multi-year trends that were synchronous across space within each group. Several macroinvertebrate groups showed significant non-linear multi-year trends, but synchrony was lower. For phytoplankton and some macroinvertebrate groups, we found that densities were highest in the South Basin, likely reflecting the gradient of decreasing nutrients in the lake from south to north. Collectively, these results suggest that modeling the food web using sub-basins is a useful scale for better understanding species dynamics in large lakes.

AB - The dynamics of populations in lake food webs are driven by a combination of spatial, environmental, and trophic processes. Differences among taxa in their ability to disperse and respond to the environment impact the food web and will be reflected in their abundances over time at different sites within a lake. The level of synchrony among lake sub-basins (within and across populations in a lake) is critical for determining the importance of spatial resolution when sampling and developing models. Using 7 years of survey data in Lake George, New York State (USA), we provide a high-level overview of changes in the densities of key food web groups over time (phytoplankton, zooplankton, and macroinvertebrates) and the synchrony of their dynamics among sub-basins. Phytoplankton biomass (measured as chlorophyll a) and zooplankton densities showed strong seasonal and multi-year trends that were synchronous across space within each group. Several macroinvertebrate groups showed significant non-linear multi-year trends, but synchrony was lower. For phytoplankton and some macroinvertebrate groups, we found that densities were highest in the South Basin, likely reflecting the gradient of decreasing nutrients in the lake from south to north. Collectively, these results suggest that modeling the food web using sub-basins is a useful scale for better understanding species dynamics in large lakes.

KW - Freshwater

KW - Lake food web

KW - Population dynamics

KW - Spatial heterogeneity

KW - Synchrony

KW - Time-series

UR - http://www.scopus.com/inward/record.url?scp=85176940472&partnerID=8YFLogxK

U2 - 10.1007/s00027-023-01022-1

DO - 10.1007/s00027-023-01022-1

M3 - Article

SN - 1015-1621

VL - 86

JO - Aquatic Sciences

JF - Aquatic Sciences

IS - 1

M1 - 8

ER -