Rockfish trophic relationships in Prince William Sound, Alaska, based on natural abundances of stable isotopes

2007 ◽  
Author(s):  
T.C. Kline Jr.
Keyword(s):  
Stable Isotopes ◽  
Trophic Relationships ◽  
Prince William Sound

scholarly journals Assessment of trophic relationships between symbiotic tropical ophiuroids using C and N stable isotope analysis

2006 ◽  
Vol 86 (6) ◽  
pp. 1443-1447 ◽  
Author(s):  
D. Fourgon ◽  
G. Lepoint ◽  
I. Eeckhaut
Keyword(s):  
Stable Isotopes ◽  
Potential Benefit ◽  
Feeding Habits ◽  
Isotope Analysis ◽  
Tracer Experiment ◽  
Trophic Relationships ◽  
Nitrogen Stable Isotopes ◽  
Carbon And Nitrogen ◽  
C And N ◽  
The One

Analyses of the natural abundance of carbon and nitrogen stable isotopes were performed to investigate the feeding habits of two ophiuroids, Ophiomastix venosa and Ophiocoma scolopendrina, and to assess the potential benefit obtained by the symbiotic Ophiomastix venosa juveniles. A tracer experiment was also carried out to clarify the contribution of algae to the nitrogen uptake amongst the tested ophiuroids. Our results suggest that Ophiocoma scolopendrina adults occupy a higher position in the food web than Ophiomastix venosa and mainly feed on neuston. In contrast, O. venosa adults feed on the alga Sargassum densifolium and on organic matter associated with sediment. Free juveniles and symbiotic juveniles of O. venosa have intermediate δ13C values between both adult species. The high proportion of 13C in the symbiotic juveniles compared to the one in their conspecific adults indicates that their diet slightly differs from the latter and is closer to that of Ophiocoma scolopendrina. This raises the hypothesis that symbiotic juveniles steal neuston from their associated host, O. scolopendrina.

scholarly journals ‘Taking Fishers’ Knowledge to the Lab’: An Interdisciplinary Approach to Understand Fish Trophic Relationships in the Brazilian Amazon

2021 ◽  
Vol 9 ◽  
Author(s):  
Paula Evelyn Rubira Pereyra ◽  
Gustavo Hallwass ◽  
Mark Poesch ◽  
Renato Azevedo Matias Silvano
Keyword(s):  
Stable Isotopes ◽  
Food Webs ◽  
Fish Species ◽  
Trophic Interactions ◽  
Brazilian Amazon ◽  
Trophic Levels ◽  
Trophic Relationships ◽  
Ecological Knowledge ◽  
Data Limitations ◽  
Combining Data

Trophic levels can be applied to describe the ecological role of organisms in food webs and assess changes in ecosystems. Stable isotopes analysis can assist in the understanding of trophic interactions and use of food resources by aquatic organisms. The local ecological knowledge (LEK) of fishers can be an alternative to advance understanding about fish trophic interactions and to construct aquatic food webs, especially in regions lacking research capacity. The objectives of this study are: to calculate the trophic levels of six fish species important to fishing by combining data from stable isotopes analysis and fishers’ LEK in two clear water rivers (Tapajós and Tocantins) in the Brazilian Amazon; to compare the trophic levels of these fish between the two methods (stable isotopes analysis and LEK) and the two rivers; and to develop diagrams representing the trophic webs of the main fish prey and predators based on fisher’s LEK. The fish species studied were Pescada (Plagioscion squamosissimus), Tucunaré (Cichla pinima), Piranha (Serrasalmus rhombeus), Aracu (Leporinus fasciatus), Charuto (Hemiodus unimaculatus), and Jaraqui (Semaprochilodus spp.). A total of 98 interviews and 63 samples for stable isotopes analysis were carried out in both rivers. The average fish trophic levels did not differ between the stable isotopes analysis and the LEK in the Tapajós, nor in the Tocantins Rivers. The overall trophic level of the studied fish species obtained through the LEK did not differ from data obtained through the stable isotopes analysis in both rivers, except for the Aracu in the Tapajós River. The main food items consumed by the fish according to fishers’ LEK did agree with fish diets as described in the biological literature. Fishers provided useful information on fish predators and feeding habits of endangered species, such as river dolphin and river otter. Collaboration with fishers through LEK studies can be a viable approach to produce reliable data on fish trophic ecology to improve fisheries management and species conservation in tropical freshwater environments and other regions with data limitations.

scholarly journals Stable Isotopes Reveal Trophic Relationships and Diet of Consumers in Temperate Kelp Forest and Coral Reef Ecosystems

Oceanography ◽  
2013 ◽  
Vol 26 (3) ◽  
pp. 180-189 ◽  
Author(s):  
Henry Page ◽  
Andrew Brooks ◽  
Michel Kulbicki ◽  
Rene Galzin ◽  
Robert Miller ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Coral Reef ◽  
Kelp Forest ◽  
Trophic Relationships ◽  
Coral Reef Ecosystems

Stable isotopes in jumbo squid (Dosidicus gigas) beaks to estimate its trophic position: comparison between stomach contents and stable isotopes

2006 ◽  
Vol 86 (2) ◽  
pp. 437-445 ◽  
Author(s):  
R.I. Ruiz-Cooley ◽  
Unai Markaida ◽  
D. Gendron ◽  
S. Aguíñiga
Keyword(s):  
Stable Isotopes ◽  
Stable Isotope ◽  
Trophic Position ◽  
Stomach Contents ◽  
Isotope Ratios ◽  
Trophic Relationships ◽  
Dosidicus Gigas ◽  
Jumbo Squid ◽  
C And N ◽  
Biomass Increase

Stomach contents and carbon (C) and nitrogen (N) stable isotope analysis were used to evaluate trophic relationships of jumbo squid, Dosidicus gigas. Buccal masses, beaks and stomach contents of large and medium maturing-sized jumbo squid and muscle from its main prey, the myctophid Benthosema panamense, were collected in the Gulf of California, Mexico during 1996, 1997 and 1999. Both the quantified C and N-isotope ratios in muscle, and stomach content analysis revealed that larger-sized maturing squid showed a higher trophic position than medium-sized individuals. However, a discrepancy between stomach contents versus stable isotope analyses was found in evaluating trophic relationships. Simple dilution models as a function of growth were used to estimate the C and N renewal dietary shift for jumbo squid. Estimates of the initial C and N pools in D. gigas with an initial age of 70 days and 210 days indicated isotopic shifts of 32% after a threefold biomass increase and 25% after a fourfold biomass increase, respectively. Additionally, beak samples of jumbo squid were evaluated as an alternative tissue to estimate squid trophic position using stable isotopes. The results showed a significant correlation between stable isotope ratios from muscle and beak samples. Muscle isotope values were higher than beak by 1% and 4% for δ13C and δ15N respectively. A test with jumbo squid beaks collected from a stomach of a stranded sperm whale confirmed the viability of this method.

Trophic relationships between a Patagonian gastropod and its epibiotic anemone revealed by using stable isotopes and direct observations

2012 ◽  
Vol 160 (4) ◽  
pp. 909-919 ◽  
Author(s):  
Soledad Zabala ◽  
Gregorio Bigatti ◽  
Florencia Botto ◽  
Oscar O. Iribarne ◽  
David E. Galván
Keyword(s):  
Stable Isotopes ◽  
Trophic Relationships ◽  
Direct Observations

scholarly journals Impacts of host phylogeny, feeding styles, and parasite attachment site on isotopic discrimination in helminths infecting coral reef fish hosts

2020 ◽  
Author(s):  
Philip M. Riekenberg ◽  
Marine J. Briand ◽  
Thibaud Moléana ◽  
Pierre Sasal ◽  
Marcel van der Meer ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Trophic Ecology ◽  
Negative Relationship ◽  
Attachment Site ◽  
Trophic Relationships ◽  
Host Phylogeny ◽  
Host Parasite

AbstractStable isotopes of carbon and nitrogen characterize trophic relationships in predator-prey relationships, with clear differences between consumer and diet (discrimination factor, Δ13C, Δ15N). However, parasite-host isotopic relationships remain unclear, with Δ13C and Δ15N remaining incompletely characterized, especially for helminths. In this study, we used stable isotopes to determine discrimination factors for 13 parasite-host pairings of helminths in coral reef fish. Δ15N differences grouped according to phylogeny and attachment site on the hosts: Δ15N was positive for trematodes and nematodes from the digestive tract and varied for cestodes and nematodes from the general cavity. Δ13C showed more complex patterns with no effect of phylogeny or attachment site. A negative relationship was observed between Δ15N and host δ15N value among different host-parasite pairings as well as within 7 out of the 13 parings, indicating that host metabolic processing affects host-parasite discrimination values. In contrast, no relationships were observed for Δ13C. Our results indicate that host phylogeny, attachment site and host stable isotope value drive Δ15N of helminths in coral reef fish while Δ13C is more idiosyncratic. These results call for use of taxon- or species-specific and scaled framework for bulk stable isotopes in the trophic ecology of parasites.

scholarly journals Trophic relationships between sperm whales and jumbo squid using stable isotopes of C and N

2004 ◽  
Vol 277 ◽  
pp. 275-283 ◽  
Author(s):  
RI Ruiz-Cooley ◽  
D Gendron ◽  
S Aguíñiga ◽  
S Mesnick ◽  
JD Carriquiry
Keyword(s):  
Stable Isotopes ◽  
Trophic Relationships ◽  
Sperm Whales ◽  
Jumbo Squid ◽  
C And N

scholarly journals Isotopic discrimination in helminths infecting coral reef fishes depends on parasite group, habitat within host, and host stable isotope value

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Philip M. Riekenberg ◽  
Marine J. Briand ◽  
Thibaud Moléana ◽  
Pierre Sasal ◽  
Marcel T. J. van der Meer ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Coral Reef ◽  
Stable Isotope ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Trophic Ecology ◽  
Negative Relationship ◽  
Reef Fishes ◽  
Trophic Relationships ◽  
Host Parasite

AbstractStable isotopes of carbon and nitrogen characterize trophic relationships in predator–prey relationships, with clear differences between consumer and diet (discrimination factor Δ13C and Δ15N). However, parasite–host isotopic relationships remain unclear, with Δ13C and Δ15N remaining incompletely characterized, especially for helminths. In this study, we used stable isotopes to determine discrimination factors for 13 parasite–host pairings of helminths in coral reef fish. Differences in Δ15N values grouped according to parasite groups and habitat within the host with positive Δ15N values observed for trematodes and nematodes from the digestive tract and variable Δ15N values observed for cestodes and nematodes from the general cavity. Furthermore, Δ13C values showed more complex patterns with no effect of parasite group or habitat within host. A negative relationship was observed between Δ15N and host δ15N values among different host-parasite pairings as well as within 7 out of the 13 pairings, indicating that host metabolic processing affects host-parasite discrimination values. In contrast, no relationships were observed for Δ13C values. Our results indicate that parasite group, habitat within host, and host stable isotope value drive Δ15N of helminths in coral reef fish while their effect on Δ13C is more idiosyncratic. These results call for use of taxon- or species-specific and scaled framework for bulk stable isotopes in the trophic ecology of parasites.

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