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Title: Predicting amphipods' brood size variation in brackish environments: an empirical model for Corophium multisetosum Stock, 1952 (Corophiidae) in Ria de Aveiro (NW Portugal)
Author: Cunha, M. R.
Moreira, M. H.
Sorbe, J. C.
Keywords: Amphipods
Ria de Aveiro
Issue Date: 31-May-2000
Publisher: Elsevier
Abstract: Data on fecundity of Corophium multisetosum from Areao (Ria de Aveiro, Portugal) are analysed by non linear regression to quantify the relationship between brood size (N-e) and head length (L-h, in mm), water temperature (T, in: degrees Celsius) and salinity (S, in psu). The aim of the analysis is to obtain a simple line N-e = a + bL(h), in which the slope (b) and the gamma intercept (a) are functions of salinity and/or temperature on each sampling occasion. The equation N-e = (-2.940 - 8.027S + (-89.431 + 18.171S + 12.904T - 0.368T(2)) L-h explains 64% of the variability of brood size throughout the breeding period. The model predicts an optimal temperature around 18 degrees C and a very low fecundity at low salinities. The graphical comparison of the lines obtained by the model and by a usual linear regression illustrates its potential usefulness to predict fecundity changes. The authors suggest that the observed variation in the fecundity of other brackish-water amphipods can be described and predicted using similar models. (C) 2000 Elsevier Science B.V. All rights reserved.
Peer review: yes
DOI: 10.1016/S0022-0981(00)00164-7
ISSN: 0022-0981
Appears in Collections:DBio - Artigos
Ria de Aveiro - Artigos

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