Changes in Food Web Structure Alter Trends of Mercury Uptake at Two Seabird Colonies in the Canadian Arctic

2014 ◽  
Vol 48 (22) ◽  
pp. 13246-13252 ◽  
Author(s):  
Birgit M. Braune ◽  
Anthony J. Gaston ◽  
Keith A. Hobson ◽  
H. Grant Gilchrist ◽  
Mark L. Mallory
Keyword(s):  
Food Web ◽  
Canadian Arctic ◽  
Food Web Structure ◽  
Web Structure ◽  
Mercury Uptake ◽  
Seabird Colonies

Benthic faunal assimilation pathways and depth-related changes in food-web structure across the Canadian Arctic

2015 ◽  
Vol 102 ◽  
pp. 55-71 ◽  
Author(s):  
Virginie Roy ◽  
Katrin Iken ◽  
Michel Gosselin ◽  
Jean-Éric Tremblay ◽  
Simon Bélanger ◽  
...  
Keyword(s):  
Food Web ◽  
Canadian Arctic ◽  
Food Web Structure ◽  
Web Structure

scholarly journals Biomarkers in Ringed Seals Reveal Recent Onset of Borealization in the High- Compared to the Mid-Latitude Canadian Arctic

2021 ◽  
Vol 8 ◽  
Author(s):  
Camille de la Vega ◽  
Claire Mahaffey ◽  
David J. Yurkowski ◽  
Louisa Norman ◽  
Elysia Simpson ◽  
...  
Keyword(s):  
Food Web ◽  
Trophic Position ◽  
Canadian Arctic ◽  
High Arctic ◽  
Trophic Levels ◽  
The Arctic ◽  
Food Web Structure ◽  
Web Structure ◽  
Ringed Seals ◽  
Ecological Changes

Warming of the Arctic has resulted in environmental and ecological changes, termed borealization, leading to the northward shift of temperate species. Borealization has occurred across all trophic levels, altering the structure of the food web. The onset and rate of borealization likely varies with latitude, depending on local warming and advection of warmer water into the Arctic. In order to assess latitudinal trends in food web structure in the Arctic, we analyzed stable nitrogen isotopes of specific amino acids alongside bulk stable carbon isotopes in ringed seal muscle tissue from the Canadian Arctic Archipelago (high-Arctic) and Southern Baffin Bay (mid-Arctic) from 1990 to 2016. Our results indicate a shift in food web structure in the high-Arctic that has occurred more recently when compared with the mid-Arctic. Specifically, over the past 25 years, the trophic position of ringed seals from the mid-Arctic was largely constant, whereas the trophic position of ringed seals decreased in the high-Arctic, reaching similar values observed in the mid-Arctic in 2015–2016. This suggests a potential shortening of the food chain length in the high-Arctic, possibly driven by changes in zooplankton communities feeding complexity in association with sea ice decline. This study identifies a temporal offset in the timing of borealization in the Canadian Arctic, resulting in different response of food webs to ecological changes, depending on latitude.

Invasive rodents have multiple indirect effects on seabird island invertebrate food web structure

2017 ◽  
Vol 27 (4) ◽  
pp. 1190-1198 ◽  
Author(s):  
Joshua J. Thoresen ◽  
David Towns ◽  
Sebastian Leuzinger ◽  
Mel Durrett ◽  
Christa P. H. Mulder ◽  
...  
Keyword(s):  
Food Web ◽  
Indirect Effects ◽  
Food Web Structure ◽  
Web Structure ◽  
Invasive Rodents

Impacts of environmental factors on the food web structure, energy flows, and system attributes along a subtropical urban river in southern China

2021 ◽  
pp. 148673
Author(s):  
Sai Wang ◽  
Tuan-Tuan Wang ◽  
Hsing-Juh Lin ◽  
Simon D. Stewart ◽  
Gong Cheng ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Food Web ◽  
Southern China ◽  
Urban River ◽  
Food Web Structure ◽  
Web Structure ◽  
Energy Flows

scholarly journals Hydrodynamics drive pelagic communities and food web structure in a tidal environment

2020 ◽  
Vol 106 (2) ◽  
pp. 69-85
Author(s):  
Matthew J. Young ◽  
Frederick Feyrer ◽  
Paul R. Stumpner ◽  
Veronica Larwood ◽  
Oliver Patton ◽  
...  
Keyword(s):  
Food Web ◽  
Food Web Structure ◽  
Web Structure ◽  
Pelagic Communities

scholarly journals The more food webs change, the more they stay the same

2009 ◽  
Vol 364 (1524) ◽  
pp. 1789-1801 ◽  
Author(s):  
Kevin Shear McCann ◽  
Neil Rooney
Keyword(s):  
Food Web ◽  
Food Webs ◽  
Temporal Variability ◽  
Spatial And Temporal Variability ◽  
Scale Invariant ◽  
Food Web Structure ◽  
Behavioural Responses ◽  
Web Structure ◽  
Food Web Ecology ◽  
Food Web Theory

Here, we synthesize a number of recent empirical and theoretical papers to argue that food-web dynamics are characterized by high amounts of spatial and temporal variability and that organisms respond predictably, via behaviour, to these changing conditions. Such behavioural responses on the landscape drive a highly adaptive food-web structure in space and time. Empirical evidence suggests that underlying attributes of food webs are potentially scale-invariant such that food webs are characterized by hump-shaped trophic structures with fast and slow pathways that repeat at different resolutions within the food web. We place these empirical patterns within the context of recent food-web theory to show that adaptable food-web structure confers stability to an assemblage of interacting organisms in a variable world. Finally, we show that recent food-web analyses agree with two of the major predictions of this theory. We argue that the next major frontier in food-web theory and applied food-web ecology must consider the influence of variability on food-web structure.

Environmental warming alters food-web structure and ecosystem function

Nature ◽  
10.1038/47023 ◽  
1999 ◽  
Vol 402 (6757) ◽  
pp. 69-72 ◽  
Author(s):  
Owen L. Petchey ◽  
P. Timon McPhearson ◽  
Timothy M. Casey ◽  
Peter J. Morin
Keyword(s):  
Food Web ◽  
Ecosystem Function ◽  
Food Web Structure ◽  
Web Structure ◽  
Environmental Warming
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