Comparisons between the diets of four abundant species of elasmobranchs in a subtropical embayment: implications for resource partitioning

White, William T.; Platell, M. E.; Potter, I. C.

doi:10.1007/s00227-003-1218-1

Cited by 123 publications

(119 citation statements)

References 36 publications

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“…Data preparation for multivariate analysis was carried out according to White et al (2004) and Marshall et al (2008). Namely, dietary data for a single individual contained large numbers of zero values, giving rise to instabilities in the calculation of similarities at an individual level, which greatly reduces the effectiveness of multivariate analyses of dietary data.…”

Section: Methodsmentioning

confidence: 99%

Variation of feeding habits of Lutjanus peru (Actinopterygii: Perciformes: Lutjanidae) caught in two regions of the Gulf of California, Mexico

Moreno-Sánchez¹

2016

Acta Ichthyol. Piscat.

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3 Fundación colombiana para la investigación y conservación de tiburones y rayas, Cali, ColombiaMoreno-Sánchez X.G., Abitia-Cardenas L.A., Trujillo-Retana G., Navia A.F., Ramírez-Pérez J.S., Shirasago-German B. 2016. Variation of feeding habits of Lutjanus peru (Actinopterygii: Perciformes: Lutjanidae) caught in two regions of the Gulf of California, Mexico. Acta Ichthyol. Piscat. 46 (2): 97-108.Background. The Pacifi c red snapper, Lutjanus peru (Nichols et Murphy, 1922), is one of the most exploited species by artisanal fi sheries in Mexico, where it is valued due to its high catch rates and economic value. This study investigated the feeding habits of L. peru in two ecosystems of the southern Gulf of California with contrasting physical and oceanographic conditions. Feeding habits were compared by sex (male or female), size (juvenile or adult), and season (cold or warm), in order to determine whether this species plays the same trophic role in the two ecosystems. Materials and methods. Samples were obtained from the northern Sinaloa coast (SIN region) and south-eastern Baja California Sur coast (BCS region). Percentages by number, weight, and frequency of each food category were determined, and the index of relative importance (%IRI) was calculated to defi ne the main food categories. Diet breadth and diet similarity between sexes, sizes and among seasons were also calculated. Results. A total of 182 stomachs from the SIN region were analysed and 32 prey items from 15 families, 18 genera, and 25 species were identifi ed. According to the index of relative importance (IRI), the most important prey items were the shrimp, Penaeus californiensis (73%); the ostracods, Myodocopida gen spp. (10%); and the squid, Loligo spp. (5%). A total of 233 stomachs from BCS were analysed and 31 prey items from 17 families, 19 genera, and 26 species were identifi ed. The most important prey items according to the IRI were the red pelagic crab, Pleuroncodes planipes (42%); the ostracods, Myodocopida gen spp. (28%); and the shrimp, Penaeus californiensis (20%). Signifi cant differences were identifi ed in the trophic spectra by region, size and season. There were no signifi cant differences by sex. Conclusion. Lutjanus peru displayed a specialist trophic behaviour, with differential utilization of the trophic niche and adequate food resource distribution.

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Section: Methodsmentioning

confidence: 99%

Variation of feeding habits of Lutjanus peru (Actinopterygii: Perciformes: Lutjanidae) caught in two regions of the Gulf of California, Mexico

Moreno-Sánchez¹

2016

Acta Ichthyol. Piscat.

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“…Posteriormente, se utilizó el análisis de similitud (ANOSIM) para evaluar la hipótesis nula de no diferencias en la composición de dietas entre sexos y estadios de madurez (Platell et al 1998, Flores-Ortega et al 2011, Bornatowski et al 2012. Los valores del estadístico R se utilizaron para describir el grado de similitud (Clarke 1993, Platell et al 1998, Clarke y Warwick 2001, White et al 2004; los valores cercanos a 1 indicaron que los dos grupos estaban completamente separados y los valores cercanos a 0 indicaron que no existían diferencias entre los dos grupos.…”

Section: Diet Analysis and Quantitative Assessmentunclassified

“…Afterwards, analyses of similarity (ANOSIM) were used to test the null hypothesis of no difference in the diet composition between sexes and maturity stages (Platell et al 1998, Flores-Ortega et al 2011, Bornatowski et al 2012. The R-statistic values were used to describe the extent of similarity (Clarke 1993, Platell et al 1998, Clarke and Warwick 2001, White et al 2004, with values near 1 indicating that the two groups are entirely separate and values close to 0 indicating that there are no differences between the two groups.…”

Section: Diet Analysis and Quantitative Assessmentmentioning

confidence: 99%

“…The guitarfish diet is dominated by small crustaceans, fishes being a complementary component (Talent 1982, White et al 2004, Bizzarro 2005, Downton-Hoffman 2007, Navia et al 2007, Valadez-González 2007, Payán et al 2011. However, changes in the diet composition of several ray species have been described to be influenced by sex or maturity stage, as well as spatial and temporal effects (Ellis et al 1996, Bethea et al 2004, Bizzarro 2005, Braccini and Perez 2005, Magraña and Gilberto 2007, Belleggia et al 2008.…”

Section: Introductionmentioning

confidence: 99%

“…En todos estos hábitats se alimentan de especies bénticas (Barbini et al 2011, BlancoParra et al 2012. Su dieta está dominada por pequeños crustáceos, y los peces son un componente complementario (Talent 1982, White et al 2004, Bizzarro 2005, DowntonHoffman 2007, Navia et al 2007, Valadez-González 2007, Payán et al 2011. Sin embargo, para varias especies, se han descrito cambios en la composición de dieta según el sexo o estado de desarrollo, así como los efectos espaciales o estacionales (Ellis et al 1996, Bethea et al 2004, Bizzarro 2005, Braccini y Perez 2005, Magraña y Gilberto 2007, Belleggia et al 2008.…”

Section: Introductionunclassified

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Feeding habits of the speckled guitarfish Rhinobatos glaucostigma (Elasmobranchii, Batoidea) in the southeastern Gulf of California

Rosa-Meza

Cueva

2013

Cienc. Mar.

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INTRODUCCIÓNEn el nivel más básico, el papel ecológico de una especie se define por su posición en la red trófica. Los batoideos, con un nivel trófico bajo (<4), están considerados como consumidores secundarios cuando son comparados con la mayoría de las especies de tiburones. Sin embargo, todavía se desconoce el nivel trófico estándar de muchos de ellos (Heithaus et al. 2010). Se predice que los batoideos tienen un papel crítico en la dinámica de los ecosistemas marinos como especies depredadoras a niveles intermedios (Ritchie ABSTRACT.To assess the feeding habits of Rhinobatos glaucostigma (speckled guitarfish), the stomach contents of 176 individuals were examined. Specimens were obtained from the artisanal gillnet fisheries operating off Nayarit, Mexico, in the southeastern region of the Gulf of California, during January-August 2008 and January-May 2009. Relative measures of prey quantities and nonparametric multivariate methods were used to analyze diet differences between sex and maturity stages. The trophic relationship and feeding strategy were determined using Levin's niche amplitude index, the Costello method modified by Amundsen, and Pianka's diet overlap index. The overall diet was dominated by crustaceans, primarily decapods, brachyurans, and cumaceans. Diets were similar between sexes and maturity stages, except between mature females and males where only slight differences were found. Mature females and immature specimens of both sexes showed specialized diets, while mature males had a generalist diet. A significant overlap between sexes and maturity stage diets was found. Diet compositions allowed us to estimate a standardized trophic level of 3.57 for R. glaucostigma. The diet compositions between sexes and maturity stages suggest that all individuals consume similar prey items and have similar trophic roles in the benthic community of the southeastern region of the Gulf of California, where R. glaucostigma should be considered a secondary consumer.Key words: guitarfish diet, feeding strategy, trophic level, diet overlap, feeding habitat.RESUMEN. Para caracterizar los hábitos alimentarios de Rhinobatos glaucostigma (guitarra punteada), se muestrearon los contenidos estomacales de 176 individuos. Los especímenes fueron capturados con redes agalleras por la pesca artesanal que opera frente a Nayarit, México, en la región sureste del golfo de California, durante los periodos de enero a agosto de 2008 y de enero a mayo de 2009. Para analizar las diferencias de dieta entre sexos y estadios de madurez, se utilizaron las medidas relativas de cuantificación de dieta y métodos no paramétricos multivariados. Las relaciones tróficas y la estrategia de alimentación fueron determinadas con el índice de amplitud de nicho de Levin, el método gráfico de Costello modificado por Amundsen y el índice de traslapo de dietas de Pianka. La dieta global estuvo dominada por crustáceos, principalmente por decápodos, braquiuros y cumáceos. Las dietas fueron similares entre sexos y estadios de madurez, excepto entre hemb...

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Collaborative methods identify a remote global diversity hotspot of threatened, large‐bodied rhino rays

Bateman,

Morgan,

Wueringer

et al. 2024

Aquatic Conservation

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North‐western Australia is considered a refuge to several highly threatened elasmobranch species, but there has been little research effort targeting lesser known, large‐bodied rhino rays. This study identified 2,343 records of globally threatened rays of the order Rhinopristiformes from the Pilbara region of Western Australia, with a focus on the Ningaloo Coast World Heritage Area and adjacent Exmouth Gulf. Occurrence data were compiled from various sources including commercial fishing reports (35%), citizen science records (34%), targeted scientific surveys (30%) and published literature (1%). The region was inhabited by all of Australia's Pristidae (four sawfish species), all of Australia's Rhinidae (three wedgefish species) and the sole Australian representative of the Glaucostegidae (giant shovelnose ray). Of the 2,343 records, ~49% were sawfishes, while giant guitarfish and wedgefishes contributed to ~33% and 18% of records, respectively. The Exmouth Gulf appears to be a globally important refuge and pupping area for green sawfish (Pristis zijsron) which was the most commonly encountered pristid. Bottlenose wedgefish (Rhynchobatus australiae) were the most commonly identified rhinid, with less frequent encounters of shark rays (Rhina ancylostoma) and eyebrow wedgefish (Rhynchobatus palpebratus). The Ningaloo Coast World Heritage Area and adjacent Exmouth Gulf host all life stages of giant shovelnose ray (Glaucostegus typus). The combined use of several data sources has highlighted the study region as a ‘lifeboat’ for these globally threatened large‐bodied rays. These data are essential in creating effective conservation and management plans in this globally important refuge, and are highly relevant to global conservation initiatives.

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Comparisons between the diets of four abundant species of elasmobranchs in a subtropical embayment: implications for resource partitioning

Cited by 123 publications

References 36 publications

Variation of feeding habits of Lutjanus peru (Actinopterygii: Perciformes: Lutjanidae) caught in two regions of the Gulf of California, Mexico

Variation of feeding habits of Lutjanus peru (Actinopterygii: Perciformes: Lutjanidae) caught in two regions of the Gulf of California, Mexico

Feeding habits of the speckled guitarfish Rhinobatos glaucostigma (Elasmobranchii, Batoidea) in the southeastern Gulf of California

Collaborative methods identify a remote global diversity hotspot of threatened, large‐bodied rhino rays

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