| the complete primary structure of the marine carnivora, galapagoes fur seal (arctocephalus galapagoensis, otariidae) hemoglobins. | the complete primary structure of the two hemoglobin components of the fur seal (arctocephalus galapagoensis) is presented. the two components (hbi and hbii) occur in nearly equal amounts and have identical beta-chains; whereas the two alpha-chains (alpha i/alpha ii) differ by six exchanges ile/val, met/thr, ser/ala, pro/his, lys/gly, and thr/ala at positions 10, 34, 35, 50, 78, and 131, respectively. the components were isolated by deae-sephacel chromatography and were separated into the globin ... | 1991 | 1910457 |
| characterization of proteins and fatty acid composition in galapagos fur seal milk. occurrence of whey and casein protein polymorphisms. | 1. milk proteins of the galapagos fur seal (arctocephalus galapagoensis) were separated adequately into whey and casein fractions using bovine milk analysis methods. 2. in samples from days 5-30 of lactation 40% of the total proteins were whey and 60% caseins; in mid-lactation, day 150, 25% were whey and 75% casein proteins. 3. electrophoretic and isoelectric focusing patterns of fur seal whey protein differed widely from bovine patterns, whereas those of caseins were similar. 4. polymorphisms o ... | 1988 | 3409671 |
| tracing early stages of species differentiation: ecological, morphological and genetic divergence of galápagos sea lion populations. | oceans are high gene flow environments that are traditionally believed to hamper the build-up of genetic divergence. despite this, divergence appears to occur occasionally at surprisingly small scales. the galápagos archipelago provides an ideal opportunity to examine the evolutionary processes of local divergence in an isolated marine environment. galápagos sea lions (zalophus wollebaeki) are top predators in this unique setting and have an essentially unlimited dispersal capacity across the en ... | 2008 | 18485220 |
| rotavirus infections in galapagos sea lions. | group a rotaviruses infect and cause diarrhea in the young of a broad range of terrestrial mammals, but it is unknown, to our knowledge, whether they infect marine mammals. during february and march of 2002 and 2003, we collected 125 serum samples and 18 rectal swab samples from galapagos sea lion pups (gsl, zalophus wollebaeki), and 22 serum samples from galapagos fur seal pups (gfs, arctocephalus galapagoensis) from nine islands of the galapagos archipelago, ecuador. sera were tested for antib ... | 2009 | 19617482 |
| individual foraging strategies reveal niche overlap between endangered galapagos pinnipeds. | most competition studies between species are conducted from a population-level approach. few studies have examined inter-specific competition in conjunction with intra-specific competition, with an individual-based approach. to our knowledge, none has been conducted on marine top predators. sympatric galapagos fur seals (arctocephalus galapagoensis) and sea lions (zalophus wollebaeki) share similar geographic habitats and potentially compete. we studied their foraging niche overlap at cabo dougl ... | 2013 | 23967096 |
| same size--same niche? foraging niche separation between sympatric juvenile galapagos sea lions and adult galapagos fur seals. | 1. in vertebrates, patterns of resource utilization change throughout development according to age- and or size-specific abilities and requirements. thus, interspecific competition affects different age classes differently. 2. adults of sympatric species often show distinct foraging niche segregation, but juvenile resource use might overlap with adult competitors of similar body size. resultant negative effects on juveniles can have important consequences for population dynamics, yet such intera ... | 2013 | 23351022 |
| field metabolic rate of lactating female galápagos fur seals (arctocephalus galapagoensis): the influence of offspring age and environment. | galápagos fur seals, arctocephalus galapagoensis, live in a seasonal environment which varies strongly in productivity from year to year. we measured how the field metabolic rates (fmr) of lactating females varied with season, pup age and year. energy expenditure was measured using doubly labeled water (dlw) during the cold seasons of 1984 and 1985 in 9 mothers of 1-3-month-old pups and 5 mothers of yearlings, and during the 1986 warm season in 8 mothers of 6-month-old pups. young pups gained 0. ... | 2001 | 11440861 |
| temperature regulation and microhabitat choice by free-ranging galapagos fur seal pups (arctocephalus galapagoensis). | behavioural activity, and core and surface temperatures of 4 unrestrained galapagos fur seals were recorded in the natural habitat during their first weeks of life. climatic variables were registered simultaneously. pup behaviours were divided into bouts of resting (55% of total time), sucking (23%) and other activities (22%). pups maintained a constant body temperature from their first day. core temperature (t e ) was 37.7° c±0.3° c (x ± sd) over 39 pup-days and 8 pup-nights. skin temperature w ... | 1986 | 28311684 |
| drastic effects of el niño on galapagos pinnipeds. | population dynamics of pinnipeds living in the tropical upwelling ecosystem of the galapagos were strongly influenced by the 1982-83 southern oscillation-el niño (en) event which was the strongest recorded in this century. the galapagos fur seal (arctocephalus galapagoensis) population lost the four youngest year classes (1980-1983) almost entirely and approximately 30% of the adult females and non-territorial males. mortality of large territorial males was almost 100%. most of the 1982 year cla ... | 1985 | 28309839 |
| effects of the lunar cycle on the galápagos fur seal, arctocephalus galapagoensis. | during the 1977 and 1979 reproductive periods of the galápagos fur seals a census taken in the mornings and evenings at cabo hammond, fernandina, showed a marked, synodic lunar rhythm in numbers of animals ashore. about twice as many fur seals were ashore at full moon than at new moon. by use of two independent fourier analysis methods, the curve of the morning counts is shown to lag 15°-20° of the lunar month behind the curve of the evening counts. the lunar effect is demonstrated for males, fe ... | 1981 | 28309937 |