Complexity of the food web structure of the Ascophyllum nodosum zone evidenced by a δ13C and δ15N study

2010 ◽  
Vol 64 (3) ◽  
pp. 304-312 ◽  
Author(s):  
Claire Golléty ◽  
Pascal Riera ◽  
Dominique Davoult
Keyword(s):  
Food Web ◽  
Ascophyllum Nodosum ◽  
Food Web Structure ◽  
Δ13c And Δ15n ◽  
Web Structure

Food web structure of a subtropical headwater stream

2007 ◽  
Vol 58 (7) ◽  
pp. 596 ◽  
Author(s):  
I-Yu Huang ◽  
Yao-Sung Lin ◽  
Chang-Po Chen ◽  
Hwey-Lian Hsieh
Keyword(s):  
Food Web ◽  
Carbon Sources ◽  
Benthic Algae ◽  
Foraging Strategy ◽  
Headwater Stream ◽  
Feeding Guilds ◽  
Food Web Structure ◽  
Feeding Mode ◽  
Δ13c And Δ15n ◽  
Web Structure

The food web structure of a headwater stream (Hapen Creek) in subtropical northern Taiwan, which is subject to regular typhoon disturbances, was characterised using stable isotope techniques. δ13C and δ15N signatures were used to examine (i) the relative contributions of allochthonous versus. autochthonous sources to the web, and (ii) the trophic organisation of the community including the predominant feeding guilds and the most prevalent feeding mode. This study presents food web attributes for one of the very few food webs studied to date in a subtropical region. Consumers utilised allochthonous and autochthonous carbon sources differently depending on their trophic positions. The majority of consumers exploited more autochthonous carbon sources. Consumers at higher trophic positions in the food web had more direct and greater association with benthic algae. Higher-order consumers also consumed allochthonous carbon in an indirect manner by assimilating lower-order insects. The results reveal the importance of invertebrate consumer snails and aquatic insects in the transfer of organic matter. Omnivores predominated in the food web; this may reflect an opportunistic foraging strategy that enables them to adapt to hydrological disturbances and a fluctuating food supply.

Benthic food web structure in the southeastern Chukchi Sea: an assessment using δ13C and δ15N analyses

Polar Biology ◽  
2010 ◽  
Vol 34 (4) ◽  
pp. 521-532 ◽  
Author(s):  
Howard M. Feder ◽  
Katrin Iken ◽  
Arny L. Blanchard ◽  
Stephen C. Jewett ◽  
Susan Schonberg
Keyword(s):  
Food Web ◽  
Chukchi Sea ◽  
Food Web Structure ◽  
Δ13c And Δ15n ◽  
Benthic Food Web ◽  
Web Structure ◽  
Benthic Food

Food-web structure in a subtropical coastal lake: how phylogenetic constraints may affect species linkages

2014 ◽  
Vol 65 (5) ◽  
pp. 453 ◽  
Author(s):  
Lúcia Ribeiro Rodrigues ◽  
Nelson Ferreira Fontoura ◽  
David da Motta Marques
Keyword(s):  
Food Web ◽  
Fish Species ◽  
Relative Size ◽  
Stomach Contents ◽  
Nitrogen Isotope ◽  
Trophic Levels ◽  
Coastal Lake ◽  
Food Web Structure ◽  
Δ13c And Δ15n ◽  
Web Structure

To describe a food-web structure is a main goal in any attempt to understand ecosystem functioning. In the present study, we analysed the isotopic composition (δ13C and δ15N) of primary producers and consumers in the large subtropical Mangueira Lake in southern Brazil. On the basis of the δ13C and δ15N values and analysis of stomach contents of several fish species, we provide a description of the food-web structure and trophic positions of the dominant fish species. Analysis of nitrogen isotope ratios indicated the existence of two consumer trophic levels. Isotopic signatures of primary consumers were compatible with those of producers, indicating a food web sustained by autochthonous carbon. Nevertheless, when food items were classified in larger groups by relative size and source, the combined analysis of isotopic signature and feeding preferences revealed a phylogenetically structured arrangement for the fish species of Mangueira Lake. This indicates that the main feeding niches are shared by taxonomically related species.

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

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.

Sign in / Sign up

Export Citation Format

Share Document