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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.
Ria de Aveiro
|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.|
|Appears in Collections:||DBio - Artigos|
Ria de Aveiro - Artigos
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