From lavage to lipids: estimating diets of seabirds

Karnovsky, Nina J.; Hobson, Keith A.; Iverson, Sara J.

doi:10.3354/meps09713

Cited by 96 publications

(50 citation statements)

References 160 publications

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“…Los estudios en el consumo de alimento en las aves permiten aportar información sobre la cadena alimenticia y la productividad de las áreas de forrajeo, así como sus requerimientos alimenticios, energéticos y reproductivos (Gullion 1966, Montevecchi 1993, Gill 1995, Barrett et al 2007, Karnovsky et al 2012. Para obtener datos cualitativos es posible utilizar la técnica de fotografía digital a distancia o digiscoping en inglés, en la que se emplea una cámara fotográfica y lentes telescópi-cos para observar el comportamiento de ingesta de presas sin perturbarlas (Leary 2004, Larson y Craig 2006.…”

Section: Gurrola-hidalgounclassified

Observaciones generales de la dieta del zanate mexicano Quiscalus mexicanus en Puerto Vallarta, México

Cupul-Magaña

Cann

Escobedo-Galván

2017

Huitzil Rev. Mex. Ornitol.

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Presentamos evidencia fotográfica de la depredación del zanate mexicano Quiscalus mexicanus sobre las especies Sceloporus melanorhinus (lagartija espinosa de nariz negra) e Iguana iguana (iguana verde), y canibalismo de huevos en un área urbana de Puerto Vallarta, México. Para documentar este comportamiento de alimentación utilizamos la fotografía digital a distancia. En esta nota se presenta el primer registro fotográfico de Q. mexicanus en depredación sobre S. melanorhinus e I. iguana, así como la confirmación del consumo de huevos conespecíficos. Nuestras observaciones pueden proveer información que estimule la investigación sobre el uso de recursos alimenticios en esta especie de zanate de amplia distribución.

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Section: Gurrola-hidalgounclassified

Observaciones generales de la dieta del zanate mexicano Quiscalus mexicanus en Puerto Vallarta, México

Cupul-Magaña

Cann

Escobedo-Galván

2017

Huitzil Rev. Mex. Ornitol.

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“…Recent advances in the fields of modeling habitat and species' distributions (Louzao et al 2011a, Louzao et al 2012, animal tracking (Hobson and Wassenaar 2008, Boersma et al 2009, Navarro et al 2009) and the use of endogenous tracers of diet including fatty acids and stable isotopes (Navarro et al 2009, Ramos et al 2011, Karnovsky et al 2012) offer a unique opportunity to investigate the feeding response of central-place foragers to spatiotemporal variations in the availability of marine food resources. In particular, remote sensing data on oceanographic features for the last decades are now available (e.g., Acha et al 2004, Boersma et al 2009, Louzao et al 2012, thus providing valuable information on marine productivity patterns at large spatial and temporal scales.…”

Section: Introductionmentioning

confidence: 99%

Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin

et al. 2014

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Abstract. Understanding how top predators respond to natural and anthropogenically induced changes in their environment is a major conservation challenge especially in marine environments. We used a multidisciplinary approach to explore the mechanisms through which a typical central-place forager, the Magellanic penguin (Spheniscus magellanicus) from the Chubut province of Argentina, responds to variations in oceanic conditions and prey resources. We combined habitat and species distribution modeling with isotopic dietary reconstructions based on blood d 13 C and d 15N values to quantify the role of bathymetry, sea-surface temperature and chlorophyll-a concentration, abundance of conspecifics, and extent of fisheries activities in explaining the foraging and feeding ecology of individuals breeding at different colonies. The at-sea distribution of penguins was tightly coupled with the spatial distribution of their staple prey species, anchovies (Engraulis anchoita), especially in areas over the continental shelf (.200 m depth), with relatively warm water (from 168 to 218C), and moderate abundances of conspecifics (from 50 to 250 individuals). Competition with conspecifics and human fisheries were also identified as important factors explaining penguin diet with decreasing relative contributions of anchovies with increasing abundance of conspecifics and fishing activity. Our multifactorial approach allowed us to simultaneously explore different physical, biological and anthropogenic features likely affecting marine resource availability, and, consequently, driving the feeding and foraging ecology of this central-place forager. Our approach can be extended to a large suite of central-place foragers, thus providing important advances in the way we investigate how to effectively conserve and manage these species.

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“…In particular, the analysis of stable isotopes has been shown to be an effective technique to investigate the trophic structure of marine food webs and resource allocation of sympatric seabirds (Cherel et al 2008Moreno et al 2013). The principle underlying this approach is that stable isotope ratios of nitrogen (δ 15 N) and carbon (δ 13 C) in predators reflect those of their prey species in a predictable manner (Karnovsky et al 2012). δ 15 N values show a stepwise enrichment between 3‰ to 5‰ with each trophic level and are reliable indicators of the consumer's trophic position (Inger and Bearhop 2008).…”

Section: Introductionmentioning

confidence: 99%

Resource partitioning between incubating and chick-rearing brown boobies and red-tailed tropicbirds on Christmas Island

et al. 2014

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Background: In oligotrophic tropical marine environments, the main mechanism explaining the coexistence of sympatric seabirds is segregation by habitat or segregation by prey within the same habitat. Both types of segregation can play a role during the breeding season due to different constraints associated with different phases of the breeding cycle. By using stable isotope analyses, we investigated intra-and interspecific foraging segregation in two tropical seabird species, the red-tailed tropicbird Phaeton rubricauda and the brown booby Sula leucogaster, breeding sympatrically on Christmas Island, Indian Ocean. We compared isotopic values of δ 13 C and δ 15 N in blood from incubating and chick-rearing adults of both species. Results: The results showed small but significantly interspecific and intraspecific differences in δ 13 C and δ 15 N values. Differences in δ 13 C values suggest spatial segregation in the main foraging grounds between the two species during the breeding season as well as between incubating and chick-rearing brown boobies. In contrast, red-tailed tropicbirds probably exploited similar foraging habitats during both breeding stages. δ 15 N values did not indicate diet-related differences, neither within nor between species, suggesting a highly opportunistic feeding behavior to cope with the limited prey available in the oligotrophic marine environment. Conclusions: Competition for prey in breeding red-tailed tropicbirds and brown boobies seems to be reduced by spatial segregation enabling both species to successfully reproduce in sympatry in an oligotrophic tropical marine environment.

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From lavage to lipids: estimating diets of seabirds

Cited by 96 publications

References 160 publications

Observaciones generales de la dieta del zanate mexicano Quiscalus mexicanus en Puerto Vallarta, México

Observaciones generales de la dieta del zanate mexicano Quiscalus mexicanus en Puerto Vallarta, México

Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin

Resource partitioning between incubating and chick-rearing brown boobies and red-tailed tropicbirds on Christmas Island

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