Data/hora: 11/06/2024 02:23:38

Provedor de dados: | 5
País: | France
Título: | Reproduction and growth of the deep-sea brittlestar ophiura-ljungmani (lyman)
Autores: | Tyler, Pa; Gage, Jd.
Data: | 1980
Ano: | 1980
Palavras-chave: | Ovocytes; Fécondité; Structure de la répartition des classes de tailles; Recrutement; Capacité de survie; Oocytes; Fecundity; Population structure; Recruitment; Survivorship.
Resumo: | Reproductive biology and population dynamics of Ophiura Ijungmani were studied by measuring disk diameters and by examining oocyte size-frequencies and fecundity from a sequential seasonal series of large samples from a 2900 m deep Permanent Station in the Rockall Trough (Northeast Atlantic). Egg size (max. 90 !lm) and fecundity (up to 57000 eggs per individual) suggests indirect planktotrophic development, while a clear annual cycle in gametogenesis, with probably synchronous spawning in JanuaryFebruary, confirms a marked seasonality that is also seen as an annual, summertime set of postlarvae on to the bottom. Analysis of size structure of the population indicates annually discrete year classes with a maximum longevitv of around 10 years. lndividuals show fastest growth and lowest survivorship as postlarvae with a higher survivorship and lower growth rate of about 1 mm. yr- 1 among sizes &gt; 1.5 mm. Reproductive maturity is reached in the third year at 3.5-4.0 mm with individuals thereafter probably reproducing annually. Possible factors controlling the annual cycle in the supposedly seasonless deep sea are discussed in relation to the possible significance of a likely seasonal pattern in downward flux of organic particles derived from surface production.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00323/43424/43087.pdf

http://archimer.ifremer.fr/doc/00323/43424/

Editor: | Gauthier-villars
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars), 1980 , Vol. 3 , N. 2 , P. 177-185

Fonte:

Gauthier-Villars

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