Search Results - "Bertellotti, M."

Integrative assessment of immunity, health-state, growth and survival of Magellanic penguin chicks in a colony exposed to ecotourism by Cumplido, M., D'Amico, V., Bertellotti, M., Atencio, M., Dinsmore, S.J., Palacios, M.G.

“…Accumulating reports of negative impacts of tourist activities on wildlife emphasize the importance of closely monitoring focal populations. Although some…”
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Food resource utilisation by the Magellanic penguin evaluated through stable-isotope analysis: segregation by sex and age and influence on offspring quality by Forero, Manuela G., Hobson, Keith A., Bortolotti, Gary R., Donázar, Jose A., Bertellotti, M., Blanco, G.

“…We used stable-isotope analysis (SIA) to evaluate sources of variation in the diet of and prey selection by Magellanic penguinsSpheniscus magellanicusbreeding…”
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interplay among grazing history, plant-plant spatial interactions and species traits affects vegetation recovery processes in Patagonian steppe by Catorci, A, F. M. Tardella, S. Cesaretti, M. Bertellotti, R. Santolini

“…Since the early 20th century Patagonian arid steppes have been subjected to overgrazing that led to the degradation of plant communities. We hypothesized that…”
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Offspring body condition and immunocompetence are negatively affected by high breeding densities in a colonial seabird: a multiscale approach by Tella, J. L., Forero, M. G., Bertellotti, M., Donázar, J. A., Blanco, G., Ceballos, O.

“…of nests, and decreased with increasing numbers of breeding pairs competing within the parental foraging ranges (100 km), probably as a result of…”
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Conspecific Food Competition Explains Variability in Colony Size: A Test in Magellanic Penguins by Forero, M. G., Tella, J. L., Hobson, K. A., Bertellotti, M., Blanco, G.

“…Food availability has been proposed as one of the main factors regulating population sizes in birds. Seabirds have provided evidence for the hypothesis that…”
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Effects of habitat degradation on the abundance, richness and diversity of raptors across Neotropical biomes by Carrete, Martina, Tella, José L., Blanco, Guillermo, Bertellotti, Marcelo

“…Population growth and human development result in biodiversity loss and biological homogenization not only in developed countries, but increasingly in the less…”
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Erysipelothrix rhusiopathiae isolated from gull-inflicted wounds in southern right whale calves by Fiorito, Carla D, Bentancor, Adriana, Lombardo, Daniel, Bertellotti, Marcelo

“…Southern right whales Eubalaena australis from Peninsula Valdés, Argentina, show wounds produced by kelp gulls Larus dominicanus that feed on the whales'…”
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Identification, molecular and phylogenetic analysis of poxvirus in skin lesions of southern right whale by Fiorito, Carla, Palacios, Carlos, Golemba, Marcelo, Bratanich, Ana, Argüelles, Maria Belen, Fazio, Ana, Bertellotti, Marcelo, Lombardo, Daniel

“…Poxvirus skin disease has been reported in several species of cetaceans, principally in odontocetes, and a single report in mysticetes. Southern right whales…”
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Effects of Research Activity on Hatching Success in a Colony of South American Terns by Blanco, Guillermo, Yorio, Pablo, Bertellotti, Marcelo

“…Determination of breeding success of birds requires a variable amount of disturbance by human observers. The effects of human disturbance during research…”
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Stable isotopes reveal trophic segregation by sex and age in the southern giant petrel in two different food webs by Forero, Manuela G., González-Solís, Jacob, Hobson, Keith A., Donázar, José A., Bertellotti, Marcelo, Blanco, Guillermo, Bortolotti, Gary R.

“…We investigated trophic ecology variation among colonies as well as sex- and age-related differences in the diet of the southern giant petrelMacronectes…”
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J Wildl Dis.: Hematologic and plasma biochemistry values for endangered red knots at wintering and migratory sites in Argentina by D'Amico, V.L, Bertellotti, M, Baker, A.J

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Spatial and Temporal Patterns in the Diet of the Kelp Gull in Patagonia by Bertellotti, Marcelo, Yorio, Pablo

“…The Kelp Gull (Larus dominicanus) is an abundant and widely distributed species in coastal Patagonia, and has increased in number at many locations during the…”
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Differential predation by mammals and birds: implications for egg-colour polymorphism in a nomadic breeding seabird by BLANCO, GUILLERMO, BERTELLOTTI, MARCELO

“…Selection for crypsis in varying environments has long been established as the main evolutionary force promoting the huge variation in avian egg coloration. In…”
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Apparent selective advantage of leucism in a coastal population of Southern caracaras (Falconidae) by Edelaar, P, Donazar, J, Soriano, M, Santillan, MA, Gonzalez-Zevallos, D, Borboroglu, P G, Lisnizer, N, Gatto, A J, Agueero, M L, Passera, CA, Ebert, LA, Bertellotti, M, Blanco, G, Abril, M

“…Background: Southern caracaras are medium-sized raptors with a large range stretching to the southern tip of South America. An aberrant, leucistic plumage is…”
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J Wildl Dis.: Exposure of red knots to select avian pathogens; Patagonia, Argentina by D'Amico, V.L, Bertellotti, M, Baker, A.J, Diaz, L.A

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Determining Sex of Magellanic Penguins Using Molecular Procedures and Discriminant Functions by Bertellotti, Marcelo, Tella, José L, Godoy, José A, Blanco, Guillermo, Forero, Manuela G, Donázar, José A, Ceballos, Olga

“…Magellanic Penguins (Spheniscus magellanicus) show little sexual dimorphism, and although males are usually larger than females, sexing by direct observation…”
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Stable isotopes reveal trophic segregation by sex and age in the southern giant petrel in two different foodwebs by Forero, M.G, González-Solís, Jacob, Hobson, K.A, Donázar Sancho, José Antonio, Bertellotti, M, Blanco, G, Bortolotti, G. R

“…We investigated trophic ecology variation among colonies as well as sex- and age-related differences in the diet of the southern giant petrel Macronectes…”
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USE OF TIPS BY NESTING KELP GULLS AT A GROWING COLONY IN PATAGONIA by Bertellotti, Marcelo, Yorio, Pablo, Blanco, Guillermo, Giaccardi, Maricel

“…We evaluated the magnitude of use of waste tips by Kelp Gulls (Larus dominicanus) nesting at Isla de los Pájaros, a large and growing colony in Patagonia,…”
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Population and conservation status of gulls breeding in coastal Argentina by Yorio, P, Bertellotti, M, Garcia Borboroglu, P

“…Three gull species breed along the coasts of Argentina (SW Atlantic): the Kelp Gull (Larus dominicanus), the Olrog Gull (Larus atlanticus), and the Dolphin…”
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Intraspecific Host Selection by Kleptoparasitic Kelp Gulls in Patagonia by Bertellotti, Marcelo, Yorio, Pablo

“…We studied kleptoparasitic behavior of Kelp Gulls (Larus dominicanus) feeding on fishery waste at trawl vessels in northern Patagonia, Argentina, by…”
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