Determination of trophic relationships within a Bohai Bay food web using stable δ15N and δ13C analysis

2005 ◽  
Vol 50 (10) ◽  
pp. 1021 ◽  
Author(s):  
Yi WAN
Keyword(s):  
Food Web ◽  
Trophic Relationships ◽  
Bohai Bay ◽  
Δ15n And Δ13c

scholarly journals An ecosystem model of food web and fisheries interactions in the Baltic Sea

2003 ◽  
Vol 60 (5) ◽  
pp. 939-950 ◽  
Author(s):  
Chris J Harvey ◽  
Sean P Cox ◽  
Timothy E Essington ◽  
Sture Hansson ◽  
James F Kitchell
Keyword(s):  
Baltic Sea ◽  
Food Web ◽  
Species Interactions ◽  
Gadus Morhua ◽  
Population Analysis ◽  
Clupea Harengus ◽  
Trophic Relationships ◽  
The Baltic Sea ◽  
Management Actions ◽  
The Baltic

Abstract Because fisheries operate within a complex array of species interactions, scientists increasingly recommend multispecies approaches to fisheries management. We created a food web model for the Baltic Sea proper, using the Ecopath with Ecosim software, to evaluate interactions between fisheries and the food web from 1974 to 2000. The model was based largely on values generated by multispecies virtual population analysis (MSVPA). Ecosim outputs closely reproduced MSVPA biomass estimates and catch data for sprat (Sprattus sprattus), herring (Clupea harengus), and cod (Gadus morhua), but only after making adjustments to cod recruitment, to vulnerability to predation of specific species, and to foraging times. Among the necessary adjustments were divergent trophic relationships between cod and clupeids: cod exhibited top-down control on sprat biomass, but had little influence on herring. Fishing, the chief source of mortality for cod and herring, and cod reproduction, as driven by oceanographic conditions as well as unexplained variability, were also key structuring forces. The model generated many hypotheses about relationships between key biota in the Baltic Sea food web and may ultimately provide a basis for estimating community responses to management actions.

Trophic relationships in a tropical stream food web assessed by stable isotope analysis

2009 ◽  
Vol 54 (5) ◽  
pp. 1028-1041 ◽  
Author(s):  
SOPHIE COAT ◽  
DOMINIQUE MONTI ◽  
CLAUDE BOUCHON ◽  
GILLES LEPOINT
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Trophic Relationships ◽  
Tropical Stream

Trophic Relationships in Freshwater Pelagic Ecosystems

1986 ◽  
Vol 43 (8) ◽  
pp. 1571-1581 ◽  
Author(s):  
Donald J. McQueen ◽  
John R. Post ◽  
Edward L. Mills
Keyword(s):  
Food Web ◽  
Trophic Status ◽  
Size Structure ◽  
Trophic Relationships ◽  
Top Down ◽  
Eutrophic Lakes ◽  
Bottom Up ◽  
Coefficients Of Variation ◽  
Step Down ◽  
Pelagic Ecosystems

Relative impacts of bottom-up (producer controlled) and top-down (consumer controlled) forces on the biomass and size structure of five major components of freshwater pelagic systems (piscivores, planktivores, zooplankton, phytoplankton, and total phosphorus availability) were estimated. Predictions that emerge are (1) maximum biomass at each trophic level is controlled from below (bottom-up) by nutrient availability, (2) this bottom-up regulation is strongest at the bottom of the food web (i.e. phosphorus → phytoplankton) and weakens by a factor of 2 with each succeeding step up the food web, (3) as energy moves up a food web, the predictability of bottom-up interactions decreases, (4) near the top of the food web, top-down (predator mediated) interactions are strong and have low coefficients of variation, but weaken with every step down the food web, (5) variability around the bottom-up regressions can always be explained by top-down forces, and (6) interplay between top-down and bottom-up effects changes with the trophic status of lakes. In eutrophic lakes, top-down effects are strong for piscivore → zooplankton, weaker for planktivore → zooplankton, and have little impact for zooplankton → phytoplankton. For oligotrophic lakes, the model predicts that top-down effects are not strongly buffered, so that zooplankton → phytoplankton interactions are significant.

Isotopic discrimination of stable isotopes of nitrogen (δ15N) and carbon (δ13C) in a host-specific holocephalan tapeworm

2013 ◽  
Vol 88 (3) ◽  
pp. 371-375 ◽  
Author(s):  
J. Navarro ◽  
M. Albo-Puigserver ◽  
M. Coll ◽  
R. Saez ◽  
M.G. Forero ◽  
...  
Keyword(s):  
Food Web ◽  
Trophic Position ◽  
Feeding Habits ◽  
Fish Host ◽  
Trophic Relationships ◽  
Isotopic Discrimination ◽  
Lack Of Information ◽  
Available Information ◽  
Host Parasite ◽  
Host Body Size

AbstractDuring the past decade, parasites have been considered important components of their ecosystems since they can modify food-web structures and functioning. One constraint to the inclusion of parasites in food-web models is the scarcity of available information on their feeding habits and host–parasite relationships. The stable isotope approach is suggested as a useful methodology to determine the trophic position and feeding habits of parasites. However, the isotopic approach is limited by the lack of information on the isotopic discrimination (ID) values of parasites, which is pivotal to avoiding the biased interpretation of isotopic results. In the present study we aimed to provide the first ID values of δ15N and δ13C between the gyrocotylidean tapeworm Gyrocotyle urna and its definitive host, the holocephalan Chimaera monstrosa. We also test the effect of host body size (body length and body mass) and sex of the host on the ID values. Finally, we illustrate how the trophic relationships of the fish host C. monstrosa and the tapeworm G. urna could vary relative to ID values. Similar to other studies with parasites, the ID values of the parasite–host system were negative for both isotopic values of N (Δδ15N = − 3.33 ± 0.63‰) and C (Δδ13C = − 1.32 ± 0.65‰), independent of the sex and size of the host. By comparing the specific ID obtained here with ID from other studies, we illustrate the importance of using specific ID in parasite–host systems to avoid potential errors in the interpretation of the results when surrogate values from similar systems or organisms are used.

Trophic Relationships in the Rhine Food Web during Invasion and after Establishment of the Ponto-Caspian Invader Dikerogammarus villosus

Hydrobiologia ◽  
2006 ◽  
Vol 565 (1) ◽  
pp. 39-58 ◽  
Author(s):  
M. C. van Riel ◽  
G. van der Velde ◽  
S. Rajagopal ◽  
S. Marguillier ◽  
F. Dehairs ◽  
...  
Keyword(s):  
Food Web ◽  
Trophic Relationships ◽  
Dikerogammarus Villosus

Permeability Determination of Bohai Bay Field for Geologic Model Input

2006 ◽  
Author(s):  
Michael David Fetkovich ◽  
Matt Gerard ◽  
Lee Chin ◽  
ShuXing Dong
Keyword(s):  
Bohai Bay ◽  
Model Input ◽  
Geologic Model

Food web structure in two counter-rotating eddies based on δ15N and δ13C isotopic analyses

2007 ◽  
Vol 54 (8-10) ◽  
pp. 1055-1075 ◽  
Author(s):  
A.M. Waite ◽  
B.A. Muhling ◽  
C.M. Holl ◽  
L.E. Beckley ◽  
J.P. Montoya ◽  
...  
Keyword(s):  
Food Web ◽  
Food Web Structure ◽  
Web Structure ◽  
Isotopic Analyses ◽  
Δ15n And Δ13c
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