ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    PUP PRODUCTION AND POPULATION TRENDS OF THE AUSTRALIAN FUR SEAL (ARCTOCEPHALUS PUSILLUS DORIFERUS) (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 21 (2005), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We estimated the number of live Australian fur seal pups using capture-markresights, direct ground counts, or aerial photography at all breeding sites following the pupping season of November-December 2002. Pups were recorded at 17 locations; nine previously known colony sites, one newly recognized colony and seven haul-out sites where pups are occasionally born. In order of size, the colonies were Lady Julia Percy Island (5,899 pups), Seal Rocks (4,882), The Skerries (2,486), Judgment Rocks (2,427), Kanowna Island (2,301), Moriarty Rocks (1,007), Reid Rocks (384), West Moncoeur Island (257), and Tenth Island (124). The newly recognized site was Rag Island, in the Cliffy Group, where we recorded 30 pups. We also recorded pups at the following haul-out sites: Cape Bridge-water (7 pups), Bull Rock (7), Wright Rock (5), Twin Islet (1), The Friars (1), He des Phoques (1), and Montague Island (1). In total, we estimate there were 19,819 (SE = 163) live pups at the time of the counts. We discuss trends in pup numbers and derive current population estimates for the Australian fur seal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2005.tb01227.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    USE OF BIOELECTRICAL IMPEDANCE ANALYSIS TO ASSESS BODY COMPOSITION OF SEALS (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 10 (1994), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Bioelectrical impedance analysis (BIA) measures resistance and reactance of a current as it passes through an organism. The validity of using BIA as a tool to measure body water content, and hence body composition and condition, was tested on harp and ringed seals. The resistance and reactance readings from BIA were compared to estimates of total body water (TBW) determined via tritiated water dilution. The relationship between resistance and TBW (% of body mass) was linear after logarithmic transformation and the two variables were highly correlated. We describe the electrode configuration and placements which provide reliable results in these seals. Our findings indicate that BIA has considerable potential as an inexpensive, rapid, and reliable technique for estimating body composition of phocid seals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1994.tb00385.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    STOMACH CONTENTS OF LONG-FINNED PILOT WHALES (GLOBICEPHALA MELAS) AND BOTTLENOSE DOLPHINS (TURSIOPS TRUNCATUS) IN TASMANIA (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 8 (1992), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1992.tb00055.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Inter-annual consistency in the fluctuating energy requirements of captive harp seals Phoca groenlandica (1997)
    Springer
    Polar biology 18 (1997), S. 311-318 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To examine seasonal and inter-annual shifts in the energy requirements of captive harp seals (Phoca groenlandica), metabolic rate and body temperature were repeatedly measured over the annual cycle. Seasonal shifts were evident in both parameters, with spring and summer (April to September) peaks decreasing throughout fall and winter (October to March). Seasonal changes in oxygen consumption concur with earlier published reports and data presented here validate these trends inter-annually. The standard metabolic rates (SMRs) of all seals were lower than predicted during fall/winter, but were indistinguishable from expected rates during spring/summer. Although individual variation in metabolic rate was largely independent of changes in both total body mass and predicted total body fat over the year, such variation was more closely related to changes in predicted lean body mass. Both deep rectal and core body temperatures co-varied with metabolic rate, perhaps indicating a metabolic defense of fat for thermoregulation. The implications of these shifting basal requirements are considered in the light of calculating the impact of the harp seal herd on fisheries resources in the Northwest Atlantic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050193
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Mercury and cadmium concentrations in the tissues of three species of southern albatrosses (1999)
    Springer
    Polar biology 22 (1999), S. 102-108 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cadmium and mercury concentrations were measured in the tissues of 64 individual albatrosses [23 wandering albatrosses (Diomedea exulans), 9 royal albatrosses (Diomedea epomophora) and 32 shy albatrosses (Thalassarche cauta)] which were killed as by-catch in longline fishing activities between 1991 and 1994. Mercury concentrations were also determined for 33 shy albatross eggs (excluding shells). The birds were all sexed and assigned to one of two age classes (immature and adult). The three species exhibited differences both in overall concentrations of cadmium and mercury, and also in the pattern of accumulation of metals with age and sex. Wandering albatrosses exhibited the highest mercury concentrations with a mean concentration in adult liver samples of 920.0 ± 794.1 μg g−1 dry weight. Shy albatrosses had the lowest mercury concentrations with mean concentrations in adult livers of 36.3 ± 21.4 mg g−1 dry weight. The highest mercury concentration was 1800 μg g−1 for an adult female wandering albatross. Cadmium concentrations were less variable, with adult royal albatrosses having the highest average concentrations (180.0 ± 165.0 in adult kidneys) and adult shy albatrosses the lowest (40.1 ± 20.0 in adult kidney). The highest individual cadmium concentration was 287 μg g−1 for a juvenile wandering albatross. There was no evidence of increased accumulation of cadmium with age in any of the species, but wandering albatrosses showed higher mercury concentrations in adults than juveniles. Female wandering albatrosses also had significantly higher mercury concentrations than males. The mercury contents of the shy albatross eggs were very low, with a maximum concentration of 5.4 μg g−1. The results of this study are consistent with the findings of previous work on albatrosses and support the notion that the life-history strategy of these species (i.e. long-lived with low reproductive output) may be an important determinant in the concentrations of some metals found in their tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050396
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The stomach contents of Antarctic petrels Thalassoica antarctica feeding young chicks at Scullin Monolith, Mawson Coast, Antarctica (1990)
    Springer
    Polar biology 10 (1990), S. 545-547 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Antarctic petrels (Thalassoica antarctica) brooding young chicks at Scullin Monolith (67°7′S, 66°42′E), Antarctica, fed fish and crustaceans (87% and 13%, respectively, on a mass basis) to their young. Amounts of solids fed were equivalent to 6.6% of the body mass of adult birds with an empty stomach. The prey comprised species known to occur in the surface layers of the Antarctic ocean in the east wind drift, such as Pleuragramma antarcticum, Notolepis coatsi and Euphausia superba, consistent with the surface feeding habits of Antarctic petrels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233704
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Assessment of body condition of harp seals (1994)
    Springer
    Polar biology 14 (1994), S. 381-387 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the relationships between blubber content and a suite of condition indices in harp seals (Phoca groenlandica). Although blubber content was significantly correlated with xiphosternal blubber depth and “Condition index” they were insensitive indicators of condition. Blubber depth was most variable at a site ca. 60–70% down the length of the body and a more recent index incorporating length, mass and blubber depth devised for phocids was an improved indicator of blubbler mass. Blubber volume was calculated in three ways based on a geometric approximation of a cylinder and also via truncated cones. The cone method accounted for more variance than the other methods although it overestimated blubber mass. Surface area was ascertained using the girth measurements of serial cones and was significantly correlated with total body mass and total body water. We suggest that estimates of total body water generated from surface area could be used to calculate total fat mass and lean body mass
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240258
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Use of temperature telemetry to monitor ingestion by a harbour seal mother and her pup throughout lactation (1995)
    Springer
    Polar biology 15 (1995), S. 155-160 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The applicability of using stomach temperature telemetry to detect and estimate milk intake throughout lactation was investigated in harbour seals (Phoca vitulina). Observations of a mother-pup pair were conducted daily while stomach temperature was concurrently logged. Milk intake caused a decrease in the pup's stomach temperature. The duration of stomach temperature change was related to the length of the nursing bout (r 2=0.82, P〈0.001). Laboratory stomach simulations suggested a strong relationship between milk volume and duration of temperature change (r 2=0.98, P〈0.001). This relationship was used to estimate the volume of milk consumed by the pup. Suckling bout length and the estimated milk intake per bout increased, as a weekly average, with pup age (one-way ANOVA; F 3.67=11.66, P〈0.001) over the 5-week lactation period. A diel change in nursing time was noted, with a transition from largely nocturnal to daytime feedings. Although not visually confirmed, stomach temperature data collected from the mother provided evidence of seawater ingestion. Methods that could improve estimates of milk intake are discussed. Stomach temperature telemetry proved to be a useful technique for detecting ingestion events in harbour seals, and may provide a valuable tool for investigating lactation energetics and aspects of maternal investment in a variety of nursing species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239055
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Can stomach temperature telemetry be used to quantify prey consumption by seals? A re-examination (1996)
    Springer
    Polar biology 16 (1996), S. 261-270 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  To further determine the efficacy of stomach temperature probes in quantifying harp seal (Phoca groenlandica) feeding behaviour, captive seals were fed stomach temperature sensors and given pre-weighed meals of herring (Clupea harengus) and crushed ice. Ingestion of either substance caused a decrease in stomach temperature. Results suggested that the magnitude of the stomach temperature change could indicate whether an ingested substance was a prey item or ice. The duration of stomach temperature change was significantly related to the quantity of fish consumed, but it accounted for just 27% of the overall variation. This percentage was considerably less than previously reported, perhaps due to the more extensive sampling regime of this study. Both the magnitude and duration of temperature change were related to the quantity of ice consumed, accounting for 69% of the mass variation. However, subsequent modelling revealed that the relationship was not robust. Despite problems with quantification, combining the use of stomach temperature telemetry with time-depth and satellite recordings could provide valuable information on the location, timing and frequency of prey consumption by seals. Results indicate that, with sufficient samples, this technique may provide a valuable tool for investigating the feeding ecology of seals and other marine endotherms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050053
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    facet.materialart.
    Unknown
    Use of temperature telemetry to monitor ingestion by a harbour seal mother and her pup throughout lactation (1995)
    Springer
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0722-4060
    Electronic ISSN: 1432-2056
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...