Are endotherms emancipated?: some considerations on the cost of reproduction
In: Oecologia, Jg. 69 H. 4, S. 631-6331986



The behavioral ecology of maternal effort in fur seals and sea lions
In: Behaviour, Jg. 114 H. 1, S. 3-201990
The breeding season of the flightless cormorant Nannopterum harrisi at Cabo Hammond, Fernandina
In: The Ibis, Jg. 125 H. 2, S. 221-2231983
Characterization of proteins and fatty acid composition in galapagos fur seal milk. Occurrence of whey and casein protein polymorphisms
In: Comparative Biochemistry and Physiology, Part B: Biochemistry and Molecular Biology, Jg. 90 H. 2, S. 447-4521988

Distribution and abundance of sea lions (Otaria byronia) and fur seals (Arctocephalus australis) in Peru
In: Zeitschrift für Säugetierkunde, Jg. 46, S. 384-3931981



Effects of the 1982/83 El Nino on Galápagos fur seals and sea lions
In: Noticias de Galápagos, Jg. 42, S. 22-231985
Effects of the lunar cycle on the Galápagos fur seal, Arctocephalus galapagoensis
In: Oecologia, Jg. 48 H. 1, S. 85-921981
Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable?
In: Canadian journal of zoology, Jg. 66 H. 8, S. 1865-18701988
First observations on colony structure, behavior and vocal repertoire of the South American fur seal (Arctocephalus australis, Zimmermann 1783) in Peru
In: Zeitschrift für Säugetierkunde, Jg. 46, S. 310-3221981
Foraging strategies of the marine iguana, Amblyrhynchus cristatus
In: Behavioral Ecology and Sociobiology, Jg. 18 H. 4, S. 259-2661986
Intraspecific allometry of neonatal size in the antarctic fur seal (Arctocephalus galapagoensis)
In: Behavioral Ecology and Sociobiology, Jg. 22 H. 5, S. 361-3641988
Maternal investment and sex-allocation in the Galapagos fur seal, Arctocephalus galapagoensis
In: Behavioral Ecology and Sociobiology, Jg. 19 H. 3, S. 157-1641986
The mating systems of pinnipeds and marine iguanas: convergent evolution of polygyny
In: Biological Journal of the Linnean Society, Jg. 21, S. 209-2161984
