Details:

Journal Title:
Ecological Applications
Personal Author:
Larson, James H. ; Richardson, William B. ; Evans, Mary Anne ; Schaeffer, Jeff ; Wynne, Timothy ; ... More +
Larson, James H. ; Richardson, William B. ; Evans, Mary Anne ; Schaeffer, Jeff ; Wynne, Timothy ; Bartsch, Michelle ; Bartsch, Lynn ; Nelson, John. C. ; Vallazza, Jon Less -
NOAA Program & Office:
NOS (National Ocean Service)
Description:
Lake Erie is a large lake straddling the border of the USA and Canada that has become increasingly eutrophic in recent years. Eutrophication is particularly focused in the shallow western basin. The western basin of Lake Erie is hydrodynamically similar to a large estuary, with riverine inputs from the Detroit and Maumee Rivers mixing together and creating gradients in chemical and physical conditions. This study was driven by two questions: (1) How does secondary production and food quality for consumers vary across this large mixing zone? and (2) Are there correlations between cyanobacterial abundance and secondary production or food quality for consumers? Measuring spatial and temporal variation in secondary production and food quality is difficult for a variety of logistical reasons, so here a common consumer approach was used. In a common consumer approach, individuals of a single species are raised under similar conditions until placed in the field across environmental gradients of interest. After some period of exposure, the response of that common consumer is measured to provide an index of spatial variation in conditions. Here, a freshwater mussel (Lampsilis siliquoidea) was deployed at 32 locations that spanned habitat types and a gradient in cyanobacterial abundance in the western basin of Lake Erie to measure spatial variation in growth (an index of secondary production) and fatty acid (FA) content (an index of food quality). We found secondary production was highest within the Maumee river mouth and lowest in the open waters of the lake. Mussel tissues in the Maumee river mouth also included more eicosapentaenoic and docosapentaenoic fatty acids (EPA and DPA, respectively), but fewer bacterial FAs, suggesting more algae at the base of the food web in the Maumee river mouth compared to open lake sites. The satellite-derived estimate of cyanobacterial abundance was not correlated to secondary production, but was positively related to EPA and DPA content in the mussels, suggesting more of these important FAs in locations with more cyanobacteria. These results suggest that growth of secondary consumers and the availability of important fatty acids in the western basin are centered on the Maumee river mouth.
Source:
Ecological Applications, 26(3), 873-885.
DOI:
https://doi.org/10.1890/15-0440
Document Type:
Journal Article
Compliance:
Submitted
Main Document Checksum:
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urn:sha256:e820a0509552c82f9f709d4ead4b4460623f51f74c65e4de6cc05a939a1dfb59
Download URL:
https://repository.library.noaa.gov/view/noaa/13759/noaa_13759_DS1.pdf
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