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RELATIVE ABUNDANCE OF LARGE WHALES AROUND SOUTH GEORGIA (1979–1998) (1999)

Moore, M. J. ; Berrow, S. D. ; Jensen, B. A. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Marine mammal science 15 (1999), S. 0

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ISSN: 1748-7692

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: To assess large-whale stocks following the cessation of land-based South Georgia whaling in 1965, we report three independent sighting databases: a cruise in 1997, observations from Bird Island (NW of South Georgia) between 1979 and 1998, and mariner sightings between 1992 and 1997. All species were rare, with sightings of southern right whales being the most common event. Two right whales photographed off South Georgia matched animals known from Peninsula Valdés, Argentina, a population known to be growing at 7%per annum. In contrast, blue and fin whales appeared to be less abundant. A single blue whale mother-calf pair was observed off the Shag Rocks in February 1997. Extirpation of animals from this particular feeding ground is the most likely reason for ongoing low numbers of all species. Other factors may include competition for krill by traditional predators such as penguins and seals and more recently by humans, an unusually high rate of natural mortality, habitat change such as alteration in sea ice coverage, and/or the impact of ongoing whaling. The history of this critical area of large-whale habitat and this report demonstrate the need for improved, consistent longterm monitoring of population trends for these depleted stocks.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1748-7692.1999.tb00891.x

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Oxidative Myocytes of Heart and Skeletal Muscle Express Abundant Sarcomeric Mitochondrial Creatine Kinase (1999)

Qin, Wenning ; Khuchua, Zaza ; Boero, Jaime ; [et al.]

Springer

Journal of molecular histology 31 (1999), S. 357-365

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ISSN: 1573-6865

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract Sarcomeric mitochondrial creatine kinase catalyzes the reversible transfer of a high energy phosphate between ATP and creatine. To study cellular distribution of the kinase, we performed immunocytochemical studies using a peptide antiserum specific for the kinase protein. Our results demonstrated that the sarcomeric mitochondrial creatine kinase gene is abundantly expressed in heart and skeletal muscle, with no protein detected in other tissues examined, including brain, lung, liver, spleen, kidney, bladder, testis, stomach, intestine, and colon. RNA blot study showed that there is no detectable expression of the kinase mRNA in the thymus gland. In heart and skeletal muscle, the kinase protein is expressed in atrial and ventricular cardiomyocytes and a subpopulation of skeletal myofibres. In skeletal muscle, fast myosin heavy chain co-localization studies demonstrated that the sarcomeric mitochondrial creatine kinase is highly expressed in type 1, slow-oxidative and type 2A, fast-oxidative-glycolytic myofibres. We conclude that the kinase gene is abundantly expressed in oxidative myocytes of heart and skeletal muscle and may contribute to oxidative capacity of these cells.