| testing olfactory foraging strategies in an antarctic seabird assemblage. | procellariiform seabirds (petrels, albatrosses and shearwaters) forage over thousands of square kilometres for patchily distributed prey resources. while these birds are known for their large olfactory bulbs and excellent sense of smell, how they use odour cues to locate prey patches in the vast ocean is not well understood. here, we investigate species-specific responses to 3-methyl pyrazine in a sub-antarctic species assemblage near south georgia island (54 degrees 00 ' s, 36 degrees 00 ' w). ... | 2004 | 15339950 |
| an assessment of oceanic seabird abundance and distribution off the southern brazilian coast using observations obtained during deep-water fishing operations. | the use of discarded fish over baited hooks used in longline fishery, and fish caught in gillnets, as a food source for gulls, albatrosses and petrels has been intensively studied in northern and southern oceans. this study describes the occurrence and abundance of seabirds observed from 20 foreign vessels which operated during the period between july 2001 and may 2005, off the southeastern and southern brazilian coast. a total of 353,557 seabirds were observed; comprising eight families and 28 ... | 2014 | 25627361 |
| diatom-specific highly branched isoprenoids as biomarkers in antarctic consumers. | the structure, functioning and dynamics of polar marine ecosystems are strongly influenced by the extent of sea ice. ice algae and pelagic phytoplankton represent the primary sources of nutrition for higher trophic-level organisms in seasonally ice-covered areas, but their relative contributions to polar marine consumers remain largely unexplored. here, we investigated the potential of diatom-specific lipid markers and highly branched isoprenoids (hbis) for estimating the importance of these two ... | 2013 | 23418580 |
| modulation of the prolactin and the corticosterone stress responses: do they tell the same story in a long-lived bird, the cape petrel? | over the last decades, the corticosterone stress response has been suggested as a major physiological tool to understand what strategy an individual might adopt in response to environmental perturbations. more recently, another hormone related to parental care--prolactin--has been suggested as a complementary tool to investigate this question. indeed, both of these hormones are affected by stressors and are involved in parental decisions, such as deserting the nest. because of these similarities ... | 2013 | 23142160 |
| energetics of nestling growth and parental effort in antarctic fulmarine petrels. | antarctic fulmarine petrels breed in some of the coldest conditions encountered by any bird and their young grow twice as fast as predicted allometrically. to examine the energetic consequences of fast growth in a cold environment, we used the doubly labeled water technique to measure field metabolic rates of adults (three species) and different-aged nestlings (four species) of antarctic fulmarine petrels in the rauer islands, east antarctica: antarctic fulmar fulmarus glacialoides, antarctic pe ... | 2003 | 12771162 |
| thermoregulation in antarctic fulmarine petrels. | we measured resting metabolic rates at air temperatures between ca. -5 and 30 degrees c in snow petrels (pagodroma nivea), cape petrels (daption capense), antarctic petrels (thalassoica antarctica), and antarctic fulmars (fulmarus glacialoides). we measured seven age classes for each species: adults, and nestlings that were 3, 8, 15, 28, 35, and 42 days old. basal metabolic rate (bmr) and thermal conductance (c) of adults averaged, respectively, 140% and 100% of values predicted allometrically f ... | 2000 | 11192262 |
| pelagic seabirds as biomonitors of persistent organic pollutants in the southwestern atlantic. | persistent organic pollutants (pops) are accumulated through time and can exert different effect on ecosystems. pops and chlorpyrifos, a current use pesticide, were assessed in body feathers of males and females of black-browed albatross (thalassarche melanophris, bba) and cape petrels (daption capense, cap) during their non-breeding seasons at the patagonian shelf, argentina. chlorpyrifos showed the highest values among all pollutants in both species (49.56-84.88 ng g-1), resulting from current ... | 2019 | 31425845 |
| high inter- and intraspecific niche overlap among three sympatrically breeding, closely related seabird species: generalist foraging as an adaptation to a highly variable environment? | ecological niche theory predicts sympatric species to show segregation in their spatio-temporal habitat utilization or diet as a strategy to avoid competition. similarly, within species individuals may specialize on specific dietary resources or foraging habitats. such individual specialization seems to occur particularly in environments with predictable resource distribution and limited environmental variability. still, little is known about how seasonal environmental variability affects segreg ... | 2020 | 31368149 |