scholarly journals Spatial diet overlap and food resource in two congeneric mullet species revealed by stable isotopes and stomach content analyses

2018 ◽  
Vol 19 (2) ◽  
pp. 116-124 ◽  
Author(s):  
A.F.S. Garcia ◽  
A.M. Garcia ◽  
S.R. Vollrath ◽  
F. Schneck ◽  
C.F.M. Silva ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Stomach Content ◽  
Food Resource ◽  
Diet Overlap ◽  
Content Analyses

Stable isotopes and stomach content analyses indicate omnivorous habits and opportunistic feeding behavior of an invasive fish

2019 ◽  
Vol 53 (3) ◽  
pp. 365-381
Author(s):  
Débora Reis de Carvalho ◽  
Diego Marcel Parreira de Castro ◽  
Marcos Callisto ◽  
Antônio Júlio de Moura Chaves ◽  
Marcelo Zacharias Moreira ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Feeding Behavior ◽  
Stomach Content ◽  
Invasive Fish ◽  
Content Analyses ◽  
Opportunistic Feeding

Effects of large lake trout (Salvelinus namaycush) on the dietary habits of small lake trout: a comparison of stable isotopes (δ15N and δ13C) and stomach content analyses

Hydrobiologia ◽  
2006 ◽  
Vol 579 (1) ◽  
pp. 175-185 ◽  
Author(s):  
Matthew D. Keyse ◽  
Kenneth Fortino ◽  
Anne E. Hershey ◽  
W. John O’Brien ◽  
Philip W. Lienesch ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Stomach Content ◽  
Dietary Habits ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Large Lake ◽  
Small Lake ◽  
Content Analyses ◽  
Δ15n And Δ13c

Effects of Cage Culture on Growth, Abundance, and Survival of Resident Largemouth Bass (Micropterus salmoides)

1978 ◽  
Vol 35 (1) ◽  
pp. 157-160 ◽  
Author(s):  
Raj V. Kilambi ◽  
James C. Adams ◽  
William A. Wickizer
Keyword(s):  
Stomach Content ◽  
Ictalurus Punctatus ◽  
Largemouth Bass ◽  
Condition Factor ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Salmo Gairdneri ◽  
Cage Culture ◽  
Content Analyses ◽  
Culture Growth

Growth, population size, and survival of resident largemouth bass (Micropterus salmoides) were estimated before, during, and after the cage culture of Salmo gairdneri and Ictalurus punctatus. Growth in length, length–weight relationship, and condition factor were similar among the periods; however, abundance and survival of largemouth bass increased through the 3 yr of investigation. Stomach content analyses showed that the bass fed on fishes (mostly Lepomis macrochirus), crayfish, insects, and zooplankton (predominantly entomostracans). Increase in the standing crops of L. macrochirus and entomostracans during the study periods have provided forage to the increased bass population and thus resulted in greater survival of the young and adult bass of the cage culture and postcage culture periods. Key words: largemouth bass, Micropterus salmoides, cage culture, growth, abundance, survival

Feeding ecology and basal food sources that sustain the Paradoxal frog Pseudis minuta: a multiple approach combining stomach content, prey availability, and stable isotopes

Hydrobiologia ◽  
2014 ◽  
Vol 740 (1) ◽  
pp. 253-264 ◽  
Author(s):  
Sonia Huckembeck ◽  
Daniel Loebmann ◽  
Edelti F. Albertoni ◽  
Sonia M. Hefler ◽  
Mauro C. L. M. Oliveira ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Stomach Content ◽  
Feeding Ecology ◽  
Prey Availability ◽  
Food Sources ◽  
Multiple Approach ◽  
Pseudis Minuta

Effects of Bythotrephes on the trophic position of native macroinvertebrates

2010 ◽  
Vol 67 (1) ◽  
pp. 58-69 ◽  
Author(s):  
Sophie E. Foster ◽  
W. Gary Sprules
Keyword(s):  
Stable Isotopes ◽  
Trophic Position ◽  
Nitrogen Isotope ◽  
Diet Overlap ◽  
Invertebrate Predators ◽  
Invasion Impacts ◽  
Isotopic Baseline ◽  
Zooplankton Communities

We measured the δ15N and δ13C stable isotopes of pelagic invertebrate predators in six central Ontario lakes, three invaded by Bythotrephes and three not invaded, to determine the effects of Bythotrephes invasion on diet overlap and trophic position of the predators. Seasonally averaged, lake-specific isotope signatures of bulk zooplankton were used as the isotopic baseline for determining nitrogen-based trophic position or carbon enrichment of the predators. Trophic positions of native Chaoborus , Leptodora , and Mysis in invaded lakes were not elevated compared with noninvaded lakes, suggesting that these predators do not feed directly on Bythotrephes. Nitrogen signatures of Mysis and Chaoborus were similar as were those of Leptodora and Bythotrephes, suggesting that invasion impacts will be greatest on Leptodora as has been observed. The trophic position of large Mysis was generally the highest and most variable of all predators, probably because it feeds on copepods that are more enriched in the heavier nitrogen isotope than bulk zooplankton and because Bythotrephes tends to decrease the ratio of cladocerans to copepods in invaded zooplankton communities.

scholarly journals Food Resource Utilization by Five Species of Benthic Feeding Fish in Passamaquoddy Bay, New Brunswick

1986 ◽  
Vol 43 (8) ◽  
pp. 1534-1546 ◽  
Author(s):  
J. Stevenson Macdonald ◽  
Roger H. Green
Keyword(s):  
Fish Species ◽  
Gadus Morhua ◽  
Function Analysis ◽  
Food Resource ◽  
Stomach Contents ◽  
Diet Overlap ◽  
Data Matrix ◽  
Pseudopleuronectes Americanus ◽  
Predator Species ◽  
Benthic Composition

Feeding relationships of various fish species, and their relationship to the composition of the surrounding sediments, were observed for 1 yr at two sites in the lower Bay of Fundy region. The fishes were the ocean pout (Macrozoarces americanus, Zoarcidae), winter flounder (Pseudopleuronectes americanus, Pleuronectidae), plaice (Hippoglossoides platessoides, Pleuronectidae), cod (Gadus morhua, Gadidae), and witch flounder (Glyptocephalus cynoglossus, Pleuronectidae). After reducing the size of the data matrix by removing redundant variables, we used discriminant function analysis to assess interspecific diet overlap and the degree to which stomach contents reflect benthic composition. Variables were ranked by their power to discriminate in pairwise comparisons among fish species and between a given fish species and benthic grab samples. Many amphipods are utilized to an equal or greater extent than their abundances in the sediments would suggest. Many annelids are underutilized. Predation by each fish species was a selective process, and interspecific diet differences are related to the morphology of the predator and the behavior and microhabitat of the prey. The fishes diets, however, are also correlated with spatial and temporal changes in the benthic composition. Specific examples are presented. As benthic food abundance increased in the surrounding sediments all predator species increased their food consumption and interspecific diet overlap declined. In some cases the degree of exploitation depended upon the size rather than the abundance of the prey item.

Sources of variability and comparability between salmonid stomach contents and isotopic analyses: study design lessons and recommendations

2011 ◽  
Vol 68 (1) ◽  
pp. 137-151 ◽  
Author(s):  
Mark R. Vinson ◽  
Phaedra Budy
Keyword(s):  
Stable Isotope ◽  
Study Design ◽  
Stomach Content ◽  
Stomach Contents ◽  
Stomach Content Analysis ◽  
Diet Overlap ◽  
Target Species ◽  
Relative Information ◽  
Isotopic Analyses ◽  
Diet Analyses

We compared sources of variability and cost in paired stomach content and stable isotope samples from three salmonid species collected in September 2001–2005 and describe the relative information provided by each method in terms of measuring diet overlap and food web study design. Based on diet analyses, diet overlap among brown trout, rainbow trout, and mountain whitefish was high, and we observed little variation in diets among years. In contrast, for sample sizes n ≥ 25, 95% confidence interval (CI) around mean δ15Ν and δ13C for the three target species did not overlap, and species, year, and fish size effects were significantly different, implying that these species likely consumed similar prey but in different proportions. Stable isotope processing costs were US$12 per sample, while stomach content analysis costs averaged US$25.49 ± $2.91 (95% CI) and ranged from US$1.50 for an empty stomach to US$291.50 for a sample with 2330 items. Precision in both δ15Ν and δ13C and mean diet overlap values based on stomach contents increased considerably up to a sample size of n = 10 and plateaued around n = 25, with little further increase in precision.

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