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  • 1
    Electronic Resource
    Electronic Resource
    Are direct developers more locally adapted than planktonic developers? (1989)
    Springer
    Marine biology 103 (1989), S. 403-411 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hypothesis that populations of direct developers exhibit greater geographic differentiation in life history features than populations of planktonic developers, was tested with two species of grazing snails of the genus Littorina from 1986 to 1987. Littorina sitkana (direct developer) and L. scutulata (planktonic developer) coexist on sun- and wave-sheltered beaches from Alaska to Oregon, USA. Seasonal patterns in growth, survival and reproduction were monitored for samples from four geographically separated populations of each species grown in population cages at a common site, Friday Harbor, Washington, USA. The environmental and population effects on growth in the two species were determined in a four-way reciprocal transplant experiment with the same populations. Both the direct and planktonic developers exhibited geographic differentiation in life history features. Differentiation in the direct developer occurred over distances shorter than 30 km, while differentiation in the planktonic developer occurred over the 500 km distance examined (greater than their larvae would likely travel).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397275
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth and longevity of the mud snail Batillaria attramentaria (1982)
    Springer
    Marine biology 67 (1982), S. 187-192 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Batillaria attramentaria (Sowerby), a recent introduction to North America from Japan, occurs on tidal mudflats from California to British Columbia. A population of this deposit-feeder was followed for 10 yr on Galiano Island, British Columbia by recovering marked individuals and by following shifts in size-frequency distributions. Growth as well as erosion pattern and age class analysis indicate that the average size of B. attramentaria in the first 6 yr of life is 3, 9, 12, 15, 17, and 18 mm in length and that longevity falls between 6 and 10 yr. Recruitment of young B. attramentaria occurred every year. The key to B. attramentaria's success must lie in its combination of both a relatively predictable annual recruitment and a moderately long longevity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401284
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Strontium marking of hatchery reared coho salmon, Oncorhynchus kisutch Walbaum, identification of adults (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 20 (1982), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Hatchery-raised coho salmon were marked with stable strontium prior to their release to sea. Returning marked spawners were correctly identified after 18 months at sea by measuring the Strontium (Sr) concentration of the central region of their scales and vertebrae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1982.tb03889.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Strontium marking of hatchery-reared coho salmon (Oncorhynchm kisutch, Walbaum) (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 14 (1979), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the management of saimonid populations it is often necessary to distinguish hatchery-reared from wild stocks. This study examines the feasability of marking fish tissue by substituting a biologically rare element, strontium, for calcium.Sixteen-month-old hatchery-reared coho salmon (Oncorhynchus kisutch, Walbaum 1792) were fed a diet, to which 10000 ppm stable strontium was added, for 60 days. Prior to their seaward migration in June 1976, the treated coho contained 32 times as much strontium in their vertebrae as did the control coho.Sixty-eight precocious males‘jacks’ returned to the hatchery in the fall of 1976 and 1200 adults in the fall of 1977. Strontium-treated ‘jacks’ contained 1·4 times as much strontium as did control ‘jacks’ however, treated and untreated fish could not be distinguished as adults. The reduction in the strontium concentration of the treated fish could be accounted for by growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1979.tb03518.x
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    Paper (German National Licenses)
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