| Abstract: | We compared Bythotrephes population demographics and dynamics to predator (planktivorous fish) and prey (small-bodied crustacean zooplankton) densities at a site sampled through the growing season in Lakes Michigan, Huron, and Erie. Although seasonal average densities of Bythotrephes were similar across lakes (222/m2 Erie, 247/m2 Huron, 162/m2 Michigan), temporal trends in abundance differed among lakes. In central Lake Erie where Bythotrephes‘ prey assemblage was dominated by small individuals (60%), where planktivorous fish densities were high (14,317/ha), and where a shallow water column limited availability of a deepwater refuge, the Bythotrephes population was characterized by a small mean body size, large broods with small neonates, allocation of length increases mainly to the spine rather than to the body, and a late summer population decline. By contrast, in Lake Michigan where Bythotrephes‘ prey assemblage was dominated by large individuals (72%) and planktivorous fish densities were lower (5052/ha), the Bythotrephes population was characterized by a large mean body size (i.e., 37–55% higher than in Erie), small broods with large neonates, nearly all growth in body length occurring between instars 1 and 2, and population persistence into fall. Life-history characteristics in Lake Huron tended to be intermediate to those found in Lakes Michigan and Erie, reflecting lower overall prey and predator densities (1224/ha) relative to the other lakes. Because plasticity in life history can affect interactions with other species, our findings point to the need to understand life-history variation among Great Lakes populations to improve our ability to model the dynamics of these ecosystems. |
| Genre: | Article |
| ProdID: | 70041367 |
| Citation Author: | Pothoven, Steven A.; Vanderploeg, Henry A.; Warner, David M.; Schaeffer, Jeffrey S.; Ludsin, Stuart A.; Claramunt, Randall M.; Nalepa, Thomas F. |
| Citation Contributing Office: | Great Lakes Science Center |
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| Citation End Page: | 141 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Great Lakes Research |
| Citation LatN: | 48.88 |
| Citation LatS: | 41.4 |
| Citation LonE: | -76.0002 |
| Citation LonW: | -92.11 |
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| Citation Online Only Flag: | |
| Citation Phsyical Description: | 8 p. |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | Influences on Bythotrephes longimanus life-history characteristics in the Great Lakes; 2012; Article; Journal; Journal of Great Lakes Research; Pothoven, Steven A.; Vanderploeg, Henry A.; Warner, David M.; Schaeffer, Jeffrey S.; Ludsin, Stuart A.; Claramunt, Randall M.; Nalepa, Thomas F. |
| Citation Start Page: | 134 |
| Citation Volume: | 38 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Influences on Bythotrephes longimanus life-history characteristics in the Great Lakes; 2012; Article; Journal; Journal of Great Lakes Research; Pothoven, Steven A.; Vanderploeg, Henry A.; Warner, David M.; Schaeffer, Jeffrey S.; Ludsin, Stuart A.; Claramunt, Randall M.; Nalepa, Thomas F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.jglr.2011.10.003 |
| Date Other: | Sat, 1 Dec 2012 00:00 -0600 |
| Publisher: | Elsevier |
