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Spatial variation in trophic structure of nearshore fishes in Lake Michigan as it relates to water clarity
- Source :
- Canadian Journal of Fisheries and Aquatic Sciences. 76:364-377
- Publication Year :
- 2019
- Publisher :
- Canadian Science Publishing, 2019.
-
Abstract
- Nearshore water clarity, as measured by remotely sensed Kd(490), and stable C and N isotopes of several nearshore fishes differed across the Lake Michigan basin. Values of δ13C of round goby (Neogobius melanstomus), yellow perch (Perca flavescens), and spottail shiner (Notropis hudsonis) were depleted in the southeast where water clarity was low relative to the southwest where water clarity was greater. Bayesian analyses were used to evaluate spatial variation in diet composition and quantify the relationship between water clarity and the proportional importance of pelagic energy in fish diets. Water clarity in nearshore areas is likely related to variable riverine inputs, resuspension, and upwelling processes. While these processes may not directly impact δ13C or δ15N of nearshore fishes, we hypothesize that water clarity differentially affects benthic and pelagic algal production. Lower water clarity in the benthos and subsequently lower benthic productivity may be related to regional diet differences and increased reliance on pelagic energy sources. Mobile fishes such as alewife (Alosa pseudoharengus) may not be in isotopic equilibrium with regional prey sources and depart from spatial patterns observed in other nearshore fishes.
- Subjects :
- 0106 biological sciences
biology
δ13C
010604 marine biology & hydrobiology
Aquatic Science
Structural basin
biology.organism_classification
010603 evolutionary biology
01 natural sciences
Water clarity
Oceanography
Round goby
Environmental science
Spatial variability
Ecology, Evolution, Behavior and Systematics
Trophic level
Subjects
Details
- ISSN :
- 12057533 and 0706652X
- Volume :
- 76
- Database :
- OpenAIRE
- Journal :
- Canadian Journal of Fisheries and Aquatic Sciences
- Accession number :
- edsair.doi...........6ba630b8d5ad7e1e6a0c6b6859a45bf8