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Galápagos Sea Lion (Zalophus wollebaeki, Sivertsen 1953)
The Galápagos sea lion (GSL, Zalophus wollebaeki) is the smallest sea lion species in the world, endemic to the Galápagos archipelago and formerly...
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California Sea Lion (Zalophus californianus, Lesson 1828)
The California sea lion is distributed from British Columbia, Canada, to the Islas Marías and Gulf of California, Mexico. The population is divided...
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Galapagos Sea Lions and Fur Seals, Adapted to a Variable World
Galapagos otariids (Galapagos sea lions Zalophus wollebaeki, and Galapagos fur seal Arctocephalus galapagoensis) have developed a number of...
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Galápagos Fur Seal (Arctocephalus galapagoensis, Heller 1904)
The Galapagos fur seal (GFS; Arctocephalus galapagoensis) is the smallest seal species, endemic to the Galapagos archipelago and closely related to...
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Age prediction model for adult male Galapagos sea lions based on skull measures
The age of adult mammals is required for studies related to ontogeny patterns, growth rate, and life history. However, the reliable age determination...
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Infectious Diseases of Marine Mammals as Sentinels of Ecosystem Health in the Neotropics
Long-lived aquatic animals, such as marine mammals, can be exposed to several environmental threats. With a wide variety of lifestyles, from large...
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Polygyny in the Era of Molecular Biology: Revisiting Bartholomew’s Model
The theory of sexual selection hypothesizes that, when females are selected to perform most parental investment, males compete for access to mates...
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Genetic Consequences of Dispersal, Philopatry and Reproductive Behaviors
Otariid behaviors, such as decisions to disperse or return to breed at the natal site and certain reproductive behaviors, when repeated over...
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Conservation Relevance of Individuals and Societies
Marine mammalsMarine mammals exhibit a wide range of variation in both individualIndividual and group behavior. Here, we explore how individuals...
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Individuality counts: A new comprehensive approach to foraging strategies of a tropical marine predator
Foraging strategies are of great ecological interest, as they have a strong impact on the fitness of an individual and can affect its ability to cope...
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Bacterial septicemia and herpesvirus infection in Antarctic fur seals (Arctocephalus gazella) stranded in the São Paulo coast, Brazil
In August 2021, two juvenile male Antarctic fur seals ( Arctocephalus gazella ) stranded in the southeastern Brazilian coast and were referred to...
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Otariid Ethology: One Researcher’s Historical Perspective
This chapter summarizes methods used to study otariids from the late 1700s to the early 1960s, when a scientific publication claimed that the...
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Playing at the Edge of the Sea: A Comparative Analysis in Otariids and Odobenids
The role of play in the superfamily Otarioidea has not been widely explored. However, all play types found in other so-called “playful groups” (e.g.,...
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Maternal Behavior in Otariids and the Walrus
The most energetically costly phases of female reproduction in placental mammals are gestation and lactation. For the young, the success of this...
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δ13C and δ15N values in pup whiskers as a proxy for the trophic behavior of Galapagos sea lion females
The Galapagos sea lion ( Zalophus wollebaeki) is one of the few pinnipeds adapted to tropical ecosystems. This adaptation exposes this species to...
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First Report of Maternal Interference Behaviour towards Sibling Aggression in the Shell-brooding Cichlid Lamprologus ornatipinnis (Cichlidae)
AbstractIn some species, siblings aggressively compete for limited resources. Such aggressive competition can affect siblings’ survival probabilities...
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Investigating the land-to-sea transition in carnivorans from the evolution of sacrum morphology in pinnipeds
The form and function of the sacrum are of great relevance to understand the evolution of locomotion in tetrapods because it is a key piece of the...
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Foraging Capacities, Behaviors and Strategies of Otariids and Odobenids
Fur seals, sea lions and the walrus (Odobenus rosmarus) are breath-hold divers that rely on swimming at depth to feed at sea. As their diving...
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Variation in plasma protein levels in House Finches (Haemorhous mexicanus): effects of season, disease state, and urbanization
Bioindicators of wildlife health are useful tools for studying the viability of various organisms and populations, and can include a range of...
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Pinniped ‘Personality’, or Consistent Individual Differences
Animal behaviorists now extensively recognize that individuals within a population differ and are consistent within structured behavioral traits...