6517 to 6528 of 13949 results
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Survival of sub-zero temperatures by two South Georgian beetles (Coleoptera, Perimylopidae)
Read more of: Survival of sub-zero temperatures by two South Georgian beetles (Coleoptera, Perimylopidae)The ability of adults and larvae of two species of perimylopid beetles (Hydromedion sparsutum, Perimylops antarcticus) to survive sub-zero temperatures was studied at Husvik, South Georgia in summer during October–December […]
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Long-term population studies of seabirds
Read more of: Long-term population studies of seabirdsLong-term studies of seabirds, some now 30–40 years old, have begun to reveal significant age-related changes in the survival and reproduction o f these long-lived animals. Evidence for density-dependent regulation […]
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Dinoflagellate cysts from the Marambio Group (Upper Cretaceous) of Humps Island
Read more of: Dinoflagellate cysts from the Marambio Group (Upper Cretaceous) of Humps IslandThirty samples from two sections on south-western Humps Island, James Ross Basin, northern Antarctic Peninsula, contain moderately diverse dinoflagellate cyst assemblages deposited in shallow shelf, open marine conditions. Assemblages contain […]
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The influence of global and local atmospheric pollution on the chemistry of Antarctic snow and ice
Read more of: The influence of global and local atmospheric pollution on the chemistry of Antarctic snow and iceThe Antarctic ice sheet is the main sink for atmospheric pollution reaching the Antarctic atmosphere from other continents. The ice preserves a historical record of the atmosphere that can be […]
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Diving Pattern and Performance in Nonbreeding Gentoo Penguins (Pygoscelis papua) during Winter
Read more of: Diving Pattern and Performance in Nonbreeding Gentoo Penguins (Pygoscelis papua) during WinterWe studied diving patterns and performance (dive depth, duration, frequency and organization during the foraging trip) in relation to diet in nonbreeding Gentoo Penguins (Pygoscelis papua) over 59 days (involving […]
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Breeding and moulting fasts in macaroni penguins: Do birds exhaust their fat reserves?
Read more of: Breeding and moulting fasts in macaroni penguins: Do birds exhaust their fat reserves?1. Plasma concentrations of urea, uric acid and total lipid were compared in pre- and late-fast breeding and moulting macaroni penguins (Eudyptes chrysolophus) to test the hypothesis that birds exhaust […]
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Diving pattern and performance in relation to foraging ecology in the gentoo penguin,Pygoscelis papua
Read more of: Diving pattern and performance in relation to foraging ecology in the gentoo penguin,Pygoscelis papuaWe present data on diving pattern and performance (dive depth, duration, frequency and organization during the foraging trip) in gentoo penguins Pygoscelis papua, obtained using time-depth recorders (n= 9 birds, […]
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Annual variation in return rate, mate and nest-site fidelity in breeding Gentoo and Macaroni Penguins
Read more of: Annual variation in return rate, mate and nest-site fidelity in breeding Gentoo and Macaroni PenguinsAnnual variation in return rate of breeding birds, mate and nest-site fidelity was studied in the resident Gentoo (Pygoscelis papua) and migratory Macaroni (Eudyptes chrysolophus) Penguin from 1986 to 1990 […]
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Reproductive endocrinology of macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins: II. Plasma levels of gonadal steroids and LH in immature birds in relation to deferred sexual maturity
Read more of: Reproductive endocrinology of macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins: II. Plasma levels of gonadal steroids and LH in immature birds in relation to deferred sexual maturityPlasma levels of LH, testosterone, estradiol, and progesterone were measured, during the breeding season, in adult and immature macaroni (Eudyptes chrysolophus) and gentoo (Pygoscelis papua) penguins, at Bird Island, South […]