| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Long-term changes in density, population structure and growth rate of Tellina tenuis from Dublin Bay, Ireland
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| Autores: |
Wilson, Jg
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| Data: |
1997
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| Ano: |
1997
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| Palavras-chave: |
Tellina tenuis
Long-term
Population
Growth
Ireland
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| Resumo: |
Changes in the Tellina tenuis population in Dublin Bay, Ireland since 1977 are described. Population density at the monitoring site increased from 260 m(-2) (although a maximum density of 548 m(-2) was found nearby) in 1977 to a peak of 434 m(-2) in 1989. Densities recently have been the lowest recorded, around 170 m(-2). These changes do not seem to have been associated with any change in elevation of the site. The population structure has changed considerably, from one dominated by larger, older animals in 1977, when there did not seem to have been any significant recruitment for the previous two years, to one in which recruitment, if not in any great numbers, has at least been more or less regular, with the last two years (1993 and 1994) showing the highest densities of young (<10 mm) recruits despite having the lowest overall population densities. However there was no direct correlation between population density and recruits, but there is some indication that the level of recruitment into the population was higher following milder winters. The larger sizes seen in the 1977 population appear to be due to the longevity of the population, as the L-infinity value (derived from Ford-Walford plots) was not noticeably higher than for other years. There were differences from year to year in both the L-infinity and the coefficient of catabolism k, but as the growth parameter w (= L-infinity . k) stayed relatively constant with a ten year mean of 6.15, it is suggested that the different rates of growth could be due to better feeding conditions and reallocation of resources.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00093/20396/18063.pdf
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| Editor: |
Gauthier-Villars
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| Relação: |
http://archimer.ifremer.fr/doc/00093/20396/
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| Formato: |
application/pdf
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| Fonte: |
Oceanolica Acta (0399-1784) (Gauthier-Villars), 1997 , Vol. 20 , N. 1 , P. 267-274
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