Breaking with tradition: redefining measures for diet description with a case study of the Aleutian skate Bathyraja aleutica (Gilbert 1896)

Brown, Simon; Bizzarro, Joseph J.; Cailliet, Gregor M.; Ebert, David A.

doi:10.1007/s10641-011-9959-z

Cited by 205 publications

(178 citation statements)

References 23 publications

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“…Although stomach content analysis appears to be the best way to specifically determine the diet of marine fishes, indices currently used to characterise diet composition remain critical (Brown et al 2012). In most studies, indices used for diet characterisation involve assessment of the number and mass of each prey inside the stomach content.…”

Section: Discussionmentioning

confidence: 99%

“…In this case, the measurement of the standardised Index of Relative Importance (IRI), calculated as: %IRI = (%N i + %W i ) %F i , cannot be done. The more consistent index, the Prey-Specific Index of Relative Importance (%PSIRI), cannot be used either (Brown et al 2012). This work is therefore based only on the use of W i as analysis of ingested biomass and F i in terms of prey consumption opportunity.…”

Section: Discussionmentioning

confidence: 99%

“…This approach relies on the random addition of samples by simulating 100 permutations. Cumulative curves that reached a stable asymptote with the slope of the linear regression (b) calculated over the last five sub-samples less than or equal to 0.05 were considered sufficient for diet identification (Brown et al 2012).…”

Section: Data Processing and Statistical Analysesmentioning

confidence: 99%

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Morphological identification and DNA barcoding used for diet analysis of gilthead seabream (Sparus aurata) in its expanding northerly range

Avignon¹,

Tastard²,

Weston³

et al. 2017

Aquat. Living Resour.

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-The gilthead seabream, Sparus aurata, is common in the Mediterranean Sea and along the Atlantic coasts of Portugal, Spain and France. Abundance of S. aurata has recently increased along the Brittany coast, showing good adaptation and acclimatisation to northern waters away from its original distribution range. The physiological adaptations (diet, reproduction, growth) of this fish to colder water could even lead to its colonisation of the English Channel. The ability to eat and digest hard prey makes this fish an important consumer of bivalves. The aim of this study was to make a preliminary evaluation of the diet of the gilthead seabream in its northern range of distribution. Prey items from stomach contents of wild adults from various sites along the East Atlantic coast of France to the English Channel were identified morphologically when it was possible, e.g. in presence of decapod appendices, shells of bivalves, or using DNA barcoding. Diet composition was analysed against sites, fish length and month of sampling using the frequency of occurrence (%F) and weight relative proportion (%W). Results showed that the diet of S. aurata was mainly composed of bivalves, malacostracans and gastropods with a huge dominance of Mytilus sp. (%F = 51.5 and %W = 40.2). This first diet analysis of individuals from the northern range of the species distribution showed its ability, as an opportunistic feeder, to find prey in newly colonised ecosystems and its preference for some organisms, especially mussels.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Data Processing and Statistical Analysesmentioning

confidence: 99%

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Morphological identification and DNA barcoding used for diet analysis of gilthead seabream (Sparus aurata) in its expanding northerly range

Avignon¹,

Tastard²,

Weston³

et al. 2017

Aquat. Living Resour.

View full text Add to dashboard Cite

show abstract

“…Prey weight was determined directly or was estimated using regressions of mass versus number. The proportional frequency of occurrence and the abundance of prey in the diet in terms of numbers and weight were calculated with the following equations (Brown et al 2012):…”

Section: Methodsmentioning

confidence: 99%

Zebra mussel (Dreissena polymorpha) affects the feeding ecology of early stage striped bass (Morone saxatilis) in the Hudson River estuary

2016

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Variability in the feeding ecology of young fishes over short and long time scales in estuaries is likely to affect population dynamics. We studied 14 years of early stage Striped Bass feeding ecology in the Hudson River Estuary over a 25-year time span, including years in which invasive zebra mussels markedly altered energy flow within the estuary. We predicted that feeding success would be low and that diet composition would be altered during years of high zebra mussel impact, particularly in upriver locations where mussels occur. Feeding success in the short term was indicated by volume of gut contents and in the long term by dry mass at length, i.e. condition; these measures were positively intercorrelated and varied significantly year to year. We tested for associations between condition and multiple biotic and abiotic environmental variables. There was a strong negative effect of zebra mussel grazing rate on condition in upriver locations and a weak positive effect in downriver locations. In upriver locations, condition was 33% higher when local salinity was high and zebra mussel grazing rates were low, whereas in downriver locations, condition was 35% higher when zebra mussel grazing rates and copepod abundance were high and local dissolved oxygen was low. Copepods, amphipods, mysids, and Leptodora constituted the highest prey-specific index of relative importance throughout the estuary. There was no evident effect of the zebra mussel invasion on diet composition. This long-term study corroborates the inferences of earlier studies that zebra mussels reduced early-stage striped bass growth rate.

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“…Making matters worse, IRI is nonadditive across taxonomic levels; therefore, IRI values are arbitrarily controlled by the taxonomic resolution chosen by the researcher, which further complicates comparisons among studies (Brown et al 2012). The intrinsic flaws associated with the IRI have caused researchers to develop a more appropriate compound index known as the prey-specific index of relative importance (PSIRI; Brown et al 2012). This new index corrects the mathematical flaws associated with IRI and enables researchers to draw comparisons among studies regardless of the taxonomic level chosen by the researchers.…”

Section: Feeding Habit Shifts In Barndoor Skatementioning

confidence: 99%

Ontogenetic and Sex‐Specific Shifts in the Feeding Habits of the Barndoor Skate

et al. 2015

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Diet analysis is critical in understanding the flow of energy within marine food webs and is necessary for trophic ecosystem modeling and subsequent ecosystem‐based management recommendations. This study represents the first comprehensive diet description for the Barndoor Skate Dipturus laevis, the largest rajid species found on the continental shelf in the northwestern Atlantic Ocean. Stomach contents were extracted from 273 individual skate caught as bycatch in the commercial scallop fishery on Georges Bank and a total of 31 prey species were identified. The Barndoor Skate feeds primarily upon sand shrimp Crangon septemspinosa, the rock crab Cancer irroratus, the Acadian hermit crab Pagurus acadianus, and teleost fish. Length‐specific analysis revealed four significant feeding groups (ANOVA: P < 0.01). Skate < 35 cm TL were specialized feeders foraging solely on caridean shrimp, and as size increased (35–75 cm TL), they began to feed upon rock crab and then the Acadian hermit crab. At lengths ranging from 85 to 105 cm TL, no caridean shrimp were found in the skate's diet and the prevalence of crustaceans decreased. Large skate (>105 cm TL) began to prey heavily upon teleost fish, yet also continued to consume larger crustaceans. Significant sex‐specific differences in food habits were also observed in the biggest skate (>105 cm TL): males fed primarily on teleost fish (∼80%); however, females maintained a diet of approximately equal amounts of fish and crustaceans. These sex‐specific feeding patterns and differential food niche utilization may be mitigated by sexually dimorphic dentition. Received November 18, 2014; accepted June 11, 2015

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Breaking with tradition: redefining measures for diet description with a case study of the Aleutian skate Bathyraja aleutica (Gilbert 1896)

Cited by 205 publications

References 23 publications

Morphological identification and DNA barcoding used for diet analysis of gilthead seabream (Sparus aurata) in its expanding northerly range

Morphological identification and DNA barcoding used for diet analysis of gilthead seabream (Sparus aurata) in its expanding northerly range

Zebra mussel (Dreissena polymorpha) affects the feeding ecology of early stage striped bass (Morone saxatilis) in the Hudson River estuary

Ontogenetic and Sex‐Specific Shifts in the Feeding Habits of the Barndoor Skate

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