Drastic effects of El Nino on Galapagos pinnipeds
In: Oecologia, Jg. 67 H. 1, S. 19-22
Effects of the 1982/83 El Nino on Galápagos fur seals and sea lions
In: Noticias de Galápagos, Jg. 42, S. 22-23Effects of the lunar cycle on the Galápagos fur seal, Arctocephalus galapagoensis
In: Oecologia, Jg. 48 H. 1, S. 85-92El Nino: effects of environmental stress on pinniped populations
In: Stress - auf allen Ebenen, Jg. 6, S. 103 ff.1992Energetic limits to brood care: influences on fertility, and longterm fitness consequences
In: Verhandlungen der Deutschen Zoologischen Gesellschaft, Jg. 84, S. 79-87Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable?
In: Canadian journal of zoology, Jg. 66 H. 8, S. 1865-1870Evolution of age at primiparity in pinnipeds in the absence of the quality–quantity trade‐off in reproduction
In: Ecology and Evolution, Jg. 9 H. 9, S. 5450-5456Feeding territories and breeding success of South Polar skuas
In: The Auk, Jg. 95 H. 1, S. 23-33Female aggression and male peace-keeping in a cichlid fish harem: conflict between and within the sexes in Lamprologus ocellatus
In: Behavioral Ecology and Sociobiology, Jg. 34 H. 2, S. 105-112First 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. 310-322Foraging strategies of the Galapagos Marine Iguana (Amblyrhynchus Cristatus): adapting behavioral rules to ontogenetic size change
In: Behaviour, Jg. 128 H. 3, S. 255-279Foraging strategies of the marine iguana, Amblyrhynchus cristatus
In: Behavioral Ecology and Sociobiology, Jg. 18 H. 4, S. 259-266Galápagos sea lions and fur seals
In: Noticias de Galápagos, Jg. 29, S. 8-14The influence of separation on the pair bond in budgerigars (Melopsittacus undulatus; Aves, Psittacidae
In: Zeitschrift für Tierpsychologie, Jg. 41, S. 396-408