TY - JOUR
T1 - Full year seasonality of benthos in the nearshore of Lake Superior
AU - Shchapov, Kirill
AU - Ozersky, Ted
N1 - Publisher Copyright:
© 2024 The Author(s)
PY - 2025/2
Y1 - 2025/2
N2 - Relatively little is known about the full-year dynamics of benthic invertebrates in seasonally-freezing lakes. In this study, we describe the seasonal variability in benthic invertebrate abundance and coarse-level taxonomic composition across five nearshore locations in Lake Superior, with a focus on the winter period. We found that benthos abundances were relatively stable across the year, with similar winter (2294 ± 987 SD ind. m−2) and summer densities (2710 ± 1445 SD ind. m−2) across all stations. Community composition was also relatively stable across the year at our study stations, with Hexagenia sp., chironomids, and oligochaetes dominating our shallowest station (Duluth Harbor) and oligochaetes, Diporeia sp., and clams (Sphaeriidae) dominating deeper locations. Across all stations, diversity was similar across seasons, with the highest number of taxa observed in the fall (5.4 ± 1.8) and lowest number in the summer (4.5 ± 1.4). We found that the winter-spring period was an important time for the reproduction of the Lake Superior keystone amphipod Diporeia sp. Finally, we show that community structure was more variable across sites than across seasons. This is one of very few studies of winter benthos in the Great Lakes and suggests that benthic invertebrate communities show muted seasonal variability compared to planktonic organisms.
AB - Relatively little is known about the full-year dynamics of benthic invertebrates in seasonally-freezing lakes. In this study, we describe the seasonal variability in benthic invertebrate abundance and coarse-level taxonomic composition across five nearshore locations in Lake Superior, with a focus on the winter period. We found that benthos abundances were relatively stable across the year, with similar winter (2294 ± 987 SD ind. m−2) and summer densities (2710 ± 1445 SD ind. m−2) across all stations. Community composition was also relatively stable across the year at our study stations, with Hexagenia sp., chironomids, and oligochaetes dominating our shallowest station (Duluth Harbor) and oligochaetes, Diporeia sp., and clams (Sphaeriidae) dominating deeper locations. Across all stations, diversity was similar across seasons, with the highest number of taxa observed in the fall (5.4 ± 1.8) and lowest number in the summer (4.5 ± 1.4). We found that the winter-spring period was an important time for the reproduction of the Lake Superior keystone amphipod Diporeia sp. Finally, we show that community structure was more variable across sites than across seasons. This is one of very few studies of winter benthos in the Great Lakes and suggests that benthic invertebrate communities show muted seasonal variability compared to planktonic organisms.
KW - Benthic macroinvertebrates
KW - Lake Superior
KW - Large lakes
KW - Seasonality
KW - Winter
UR - http://www.scopus.com/inward/record.url?scp=85186255571&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85186255571&partnerID=8YFLogxK
U2 - 10.1016/j.jglr.2024.102314
DO - 10.1016/j.jglr.2024.102314
M3 - Article
AN - SCOPUS:85186255571
SN - 0380-1330
VL - 51
JO - Journal of Great Lakes Research
JF - Journal of Great Lakes Research
IS - 1
M1 - 102314
ER -