Standardized diet compositions and trophic levels of skates (Chondrichthyes: Rajiformes: Rajoidei)

Ebert, David A.; Bizzarro, Joseph J.

doi:10.1007/978-1-4020-9703-4_8

Cited by 76 publications

(160 citation statements)

References 45 publications

Supporting

Mentioning

144

Contrasting

Unclassified

Order By: Relevance

“…The taxonomic categories used to calculate the standardized trophic level of R. radula were Teleosts, Cephalopoda, Mollusca (excluding cephalopods), Decapods, Amphipods (Amphipods and Isopods), Mysids, Other crustaceans (stomatopods), Polychaetes and other invertebrates (sipunculids and echinoderms). The trophic level of each prey category was obtained from Ebert and Bizarro (2007).…”

Section: Level Trophic and Feeding Strategymentioning

confidence: 99%

Food habits of the rough rayRaja radula(Chondrichthyes: Rajidae) from the Gulf of Gabès (central Mediterranean Sea)

Kadri

Saïdi

Marouani

et al. 2013

Italian Journal of Zoology

View full text Add to dashboard Cite

The food habits of rough ray Raja radula were investigated, with respect to sex, size and season, based on stomach content analyses of specimens collected from commercial fisheries, monthly during 2007 in the Gulf of Gabès (Central Mediterranean Sea). Of 950 stomachs examined, 183 were empty (19.26%). The overall diet of R. radula mainly consisted of crustacean decapods, teleosts and molluscs. Polycheates, sipunculids and echinoderms were minor dietary components. No differences were observed in the major preys consumed between the sexes, but ontogenetic and seasonal changes were found. The dietary trend with size shifted from crustaceans to teleosts. The consumptions of minor preys were independent from both size and season. Quantitative analysis and graphical methods indicated the rough ray to be a specialized feeder.

show abstract

Section: Level Trophic and Feeding Strategymentioning

confidence: 99%

Food habits of the rough rayRaja radula(Chondrichthyes: Rajidae) from the Gulf of Gabès (central Mediterranean Sea)

Kadri

Saïdi

Marouani

et al. 2013

Italian Journal of Zoology

View full text Add to dashboard Cite

show abstract

“…Prey accumulation as a function of number of samples was plotted to determine if sufficient samples were collected to characterize the diets of the MPA and reference areas (Ferry & Cailliet 1996, Bizzarro et al 2007). The relationship between number of samples and number of prey taxa observed was plotted using the specaccum function in the vegan community ecology package of the software program R 2.10.1 (Bizzarro et al 2007, Oksanen et al 2010). Diet evenness was calculated using Pielou's evenness measure (J '):…”

Section: Determining Long-term Effects Of Fishing Exclusion At Point mentioning

confidence: 99%

“…The trophic level of each fish was calculated from stomach contents following Cortés (1999) and Ebert & Bizzarro (2007): (5) where TL k is the trophic level of species k, P j is the proportion of prey category j in the diet of species k, n is total number of prey categories, and TL j is the trophic level of prey category j. Percent weight values were used for P j , and prey groups were assigned trophic levels following the characterization of Ebert & Bizzarro (2007). An independent 2-sample t-test was used to detect differences in mean trophic level …”

Section: Determining Long-term Effects Of Fishing Exclusion At Point mentioning

confidence: 99%

Trophic ecology of the gopher rockfish Sebastes carnatus inside and outside of central California marine protected areas

Loury¹,

Bros²,

Starr³

et al. 2015

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Marine protected areas (MPAs) can potentially alter food web dynamics by increasing the density of fishes within their borders. Such increases in the density of potential competitors can cause generalist predators to contract the scope of their diets. This study investigated the effects of increased conspecific fish density on the diets of gopher rockfish Sebastes carnatus at a 35 yr old MPA in Point Lobos, California, and at 4 newly established MPAs in Año Nuevo, Point Lobos, Piedras Blancas, and Point Buchon in central California. Analyses were conducted for 707 stomachs collected from 2007 to 2009. Diets did not differ inside versus outside the old Point Lobos MPA in terms of prey richness, evenness, composition, or gopher rockfish trophic level. However, fish outside the MPA had greater levels of individual specialization. No consistent differences in these metrics were observed inside versus outside the 4 new MPAs, although prey composition and evenness did differ significantly among geographic locations. Diets at Año Nuevo, the most northern and shallow location, consisted predominantly of Cancer spp. and porcelain crabs (Porcellanidae), while diets from southern, deeper locations were dominated by brittle stars (Ophiuroidea). The case study of the old Point Lobos MPA indicates that fish feeding ecology may not change in an MPA after several decades. Differences in prey observed among geographic locations suggest variation in the community composition among central California's new MPAs, which may influence the effect of each MPA on food web dynamics over time.

show abstract

“…From a trophic viewpoint, skates may have an important role in structuring marine communities due to their wide distribution and high abundance (Ebert & Bizzarro, 2007). These roles in the marine communities can be influenced by traits of the predator (e.g.…”

Section: Introductionmentioning

confidence: 99%

Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Barbini

Lucifora

2016

Neotrop. ichthyol.

View full text Add to dashboard Cite

The eyespot skate, Atlantoraja cyclophora, is an endemic species from the southwestern Atlantic, occurring from Rio de Janeiro, Brazil, to northern Patagonia, Argentina. The feeding habits of this species, from off Uruguay and north Argentina, were evaluated using a multiple hypothesis modelling approach. In general, the diet was composed mainly of decapod crustaceans, followed by teleost fishes. Molluscs, mysidaceans, amphipods, isopods, lancelets and elasmobranchs were consumed in lower proportion. The consumption of shrimps drecreased with increasing body size of A. cyclophora. On the other hand, the consumption of teleosts increased with body size. Mature individuals preyed more heavily on crabs than immature individuals. Teleosts were consumed more in the south region (34º -38ºS) and crabs in the north region (38º -41ºS). Shrimps were eaten more in the warm season than in the cold season. Prey size increased with increasing body size of A. cyclophora, but large individuals also consumed small teleosts and crabs. Atlantoraja cyclophora has demersal-benthic feeding habits, shifts its diet with increasing body size and in response to seasonal and regional changes in prey availability and distribution.La raya de círculos, Atlantoraja cyclophora, es una especie endémica del Atlántico Sudoccidental, que se distribuye desde Río de Janeiro, Brasil, hasta el norte de la Patagonia, Argentina. Los hábitos alimentarios de esta especie fueron evaluados frente a la costa de Uruguay y norte de Argentina, utilizando un enfoque de modelado de múltiples hipótesis. En general, la dieta estuvo compuesta principalmente por crustáceos decápodos (71,37 %IRI), seguido de peces teleósteos (28,54 %IRI). En menor proporción fueron consumidos moluscos, misidáceos, anfípodos, isópodos, anfioxos y elasmobranquios. El consumo de decápodos Natantia disminuyó con el incremento del tamaño del cuerpo de A. cyclophora. Por otro lado, el consumo de teleósteos se incrementó con el incremento del tamaño del cuerpo. Individuos maduros consumieron cangrejos en mayor proporción que individuos inmaduros. Los teleósteos fueron consumidos mayormente en la región sur (34º -38ºS) y los cangrejos en la región norte (38º -41ºS). Los decápodos Natantia fueron más consumidos en la estación cálida que en la estación fría. El tamaño de las presas consumidas se incrementó con el aumento del tamaño corporal de A. cyclophora, pero individuos de mayor tamaño no abandonadon el consumo de pequeños cangrejos y teleósteos. Atlantoraja cyclophora presenta hábitos alimentarios demersal-bentónicos, cambia su dieta con el incremento del tamaño corporal y en respuesta a cambios estacionales y regionales en la disponibilidad y distribución de las presas.

show abstract

Standardized diet compositions and trophic levels of skates (Chondrichthyes: Rajiformes: Rajoidei)

Cited by 76 publications

References 45 publications

Food habits of the rough rayRaja radula(Chondrichthyes: Rajidae) from the Gulf of Gabès (central Mediterranean Sea)

Food habits of the rough rayRaja radula(Chondrichthyes: Rajidae) from the Gulf of Gabès (central Mediterranean Sea)

Trophic ecology of the gopher rockfish Sebastes carnatus inside and outside of central California marine protected areas

Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Contact Info

Product

Resources

About