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Allometry and population structure of Nicolea uspiana (Polychaeta: Terebellidae)

Published online by Cambridge University Press:  12 February 2010

A.R.S. Garraffoni ,
L.Q. Yokoyama  and
A.C.Z. Amaral
A.R.S. Garraffoni*
Affiliation:
Laboratório de Macrobentos Marinho, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, CEP: 13083-970, CP: 6109, Campinas, Brazil
L.Q. Yokoyama
Affiliation:
Pós-Graduação em Zoologia, Departamento de Zoologia, IB, Universidade de São Paulo, São Paulo, Brazil Laboratório de Macrobentos Marinho, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, CEP: 13083-970, CP: 6109, Campinas, Brazil
A.C.Z. Amaral*
Affiliation:
Laboratório de Macrobentos Marinho, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, CEP: 13083-970, CP: 6109, Campinas, Brazil
*
Correspondence should be addressed to: A.R.S. Garraffoni and A.C.Z. Amaral, Laboratório de Macrobentos Marinho, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, CEP: 13083-970, CP: 6109 Campinas, Brazil emails: [email protected]; [email protected]
Correspondence should be addressed to: A.R.S. Garraffoni and A.C.Z. Amaral, Laboratório de Macrobentos Marinho, Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, CEP: 13083-970, CP: 6109 Campinas, Brazil emails: [email protected]; [email protected]
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Abstract

The relative growth and population structure of the terebellid Nicolea uspiana were investigated in the intertidal zone of a rocky shore on the south-east coast of Brazil, from May 2006 to May 2007. Eight hundred and forty-seven individuals of N. uspiana were analysed: 391 males, 163 females, and 293 immatures. Although significant differences in some morphometric parameters were found, there was no sexual dimorphism between males and females. There were differences in total length, width of segment 5, and length of the notopodial region between matures and immatures. The negative allometry of the total length in relation to five other parameters showed that this feature is a good measure for estimating the individual size, which was then used in the analysis of population structure. This population of N. uspiana showed a bimodal size–frequency distribution, with immature and mature individuals found during the entire year. This pattern indicates continuous reproduction, with each cohort growing for at least three to four months and being responsible for two consecutive settlement peaks.

Keywords

relative growthage-class structurepopulation dynamics
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 5 , August 2010 , pp. 877 - 883
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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