A Trophic Position Model of Pelagic Food Webs: Impact on Contaminant Bioaccumulation in Lake Trout

1996 ◽  
Vol 66 (4) ◽  
pp. 451-477 ◽  
Author(s):  
M. Jake Vander Zanden ◽  
Joseph B. Rasmussen
Keyword(s):  
Food Webs ◽  
Lake Trout ◽  
Trophic Position ◽  
Pelagic Food Webs

scholarly journals First study of food webs in a large glacial river: the trophic role of invasive trout

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Marina Tagliaferro ◽  
Sean P. Kelly ◽  
Miguel Pascual
Keyword(s):  
Rainbow Trout ◽  
Food Webs ◽  
Fish Species ◽  
Lake Trout ◽  
Trophic Position ◽  
Life Stage ◽  
Trophic Levels ◽  
Basal Resources ◽  
Ecological Importance ◽  
Δ15n And Δ13c

Abstract The aim of this study was to determine the food webs structure of a large Patagonian river in two river sections (Upstream and Midstream) and to evaluate isotopic overlap between native and introduced species. We used stable isotope analyses of δ15N and δ13C and stomach content. The Upstream section had a more complex food webs structure with a greater richness of macroinvertebrates and fish species than Midstream. Upstream basal resources were dominated by filamentous algae. Lake Trout were found to have a higher trophic position than all other fish species in that area although, the most abundant fish species, were Rainbow Trout. Depending on the life stage, Rainbow Trout shifted from prey to competitor/predator. In the Midstream section, the base of the food webs was dominated by coarse particulate organic matter, and adult Rainbow Trout had the highest trophic level. Isotopic values changed among macroinvertebrates and fish for both areas. The two most abundant native and invasive species — Puyen and Rainbow Trout — showed an isotopic separation in Midstream but did not in Upstream areas. The presence of invasive fish that occupy top trophic levels can have a significant impact on native fish populations that have great ecological importance in the region.

scholarly journals Eutrophication induces shifts in the trophic position of invertebrates in aquatic food webs

Ecology ◽  
2020 ◽  
Author(s):  
Gea H. Lee ◽  
J. Arie Vonk ◽  
Ralf C.M. Verdonschot ◽  
Michiel H.S. Kraak ◽  
Piet F.M. Verdonschot ◽  
...  
Keyword(s):  
Food Webs ◽  
Trophic Position ◽  
Aquatic Food Webs ◽  
Aquatic Food

The paradox of pelagic food webs in the northern Bering Sea—I. Seabird food habits

1987 ◽  
Vol 7 (8) ◽  
pp. 895-911 ◽  
Author(s):  
Alan M. Springer ◽  
Edward C. Murphy ◽  
David G. Roseneau ◽  
C. Peter McRoy ◽  
Brian A. Cooper
Keyword(s):  
Food Webs ◽  
Bering Sea ◽  
Food Habits ◽  
Northern Bering Sea ◽  
Pelagic Food Webs

FISHES AS INTEGRATORS OF BENTHIC AND PELAGIC FOOD WEBS IN LAKES

Ecology ◽  
2002 ◽  
Vol 83 (8) ◽  
pp. 2152-2161 ◽  
Author(s):  
M. Jake Vander Zanden ◽  
Yvonne Vadeboncoeur
Keyword(s):  
Food Webs ◽  
Pelagic Food Webs

Food Webs as Complex Adaptive Systems

2011 ◽  
Author(s):  
Kevin S. McCann
Keyword(s):  
Food Webs ◽  
Complex Adaptive Systems ◽  
Adaptive Systems ◽  
Lake Trout ◽  
Human Impacts ◽  
Interaction Strength ◽  
Ecosystem Dynamics ◽  
Ecosystem Size ◽  
Complex Adaptive

This chapter examines some of the potential empirical signatures of instability in complex adaptive food webs. It first considers the role of adaptive behavior on food web topology, ecosystem size, and interaction strength before discussing the implications of this behavior for ecosystem dynamics and stability. It then analyzes the results of empirical investigations of Canadian Shield lake trout food webs and how human influences and ecosystems coupled in space may drive biomass pyramids, potentially leading to species loss. It also explores the tendency of subsidies, through human impacts, to homogenize natural ecosytems and concludes by assessing some of the changing conditions that are being driven by humans and how these may change ecosystems.

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