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Titolo:
Modeling the growth of the Chilean loco, Concholepas concholepas (Bruguiere, 1789) using a modified Gompertz-type function
Autore:
Rodriguez, L; Daneri, G; Torres, C; Leon, M; Bravo, L;
Indirizzi:
Univ Del Mar, Escuela Pesquerilas & Cultivos, Valparaiso, Chile Univ Del Mar Valparaiso Chile Pesquerilas & Cultivos, Valparaiso, Chile Univ Del Mar, CEA, Valparaiso, Chile Univ Del Mar Valparaiso ChileUniv Del Mar, CEA, Valparaiso, Chile
Titolo Testata:
JOURNAL OF SHELLFISH RESEARCH
fascicolo: 1, volume: 20, anno: 2001,
pagine: 309 - 315
SICI:
0730-8000(200106)20:1<309:MTGOTC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
PANULIRUS-CYGNUS; MURICIDAE; SHELL; AGE; GASTROPODA; MOLLUSCA; FISHES;
Keywords:
growth rate; Gompertz model; intertidal gastropods; aquaculture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Rodriguez, L Univ Del Mar, Escuela Pesquerilas & Cultivos, Carmen 446, Valparaiso, Chile Univ Del Mar Carmen 446 Valparaiso Chile Valparaiso, Chile
Citazione:
L. Rodriguez et al., "Modeling the growth of the Chilean loco, Concholepas concholepas (Bruguiere, 1789) using a modified Gompertz-type function", J SHELLFISH, 20(1), 2001, pp. 309-315

Abstract

A modified Gompertz-type function was fitted by nonlinear numerical methods to the absolute growth rates(mm/day) of the marine gastropod Concholepas concholepas, known in Chile as "loco. " The data for this study were obtained from laboratory and field experiments as well as from published and unpublished reports of loco growth. The fit of the modified Gompertz-type function was compared to the fit obtained with the commonly used von Bertalanffy function using the Akaike information criteria corrected by sample size bias (AIC(c)). The modified Gompertz function used in this study was dL/dt = (a(0)L(a1))*(exp(-a2L)) + a(3), where L is the peristomal length (mm), and a(0), a(1), a(2) and a(3) are the parameters of the model. The biological meaning of the constant a. of the function is equivalent to the asymptotic growth rate for the species. The von Bertalanffy growth rate equation can be expressed as dL/dt = - k (L-infinity - L). This equation represents a straight line with a negative slope equal to -k and with the y-axis intercept dL/dt = 0, providing an estimate of L-infinity The fitted parameters obtainedby fitting a modified Gompertz-type of model to the pooled growth rate data were a(0) = 2.9300e-05, a(1) = 4.2605, a(2) = 0.2011, and a(3) = 0.02852 with a degree of freedom corrected r(2) = 0.595. For the von Bertalanffy function the fitted parameters were k = 5.943e-04 (day(-1)) and L, = 150.6 min with r(2) = 0.387. The AlCc of the Gompertz fit was -6,086; whereas, the AICe of the von Bertalanffy fit was -5,611. The smaller AIC, value -6,086 indicates that the modified Gompertz function provides a better fit to the loco growth rate data. The form of the projected modified Gompertz-type growth curve differs notably from the traditional von Bertalanffy curve for juvenile growth. The modified Gompertz model does not reach an asymptotic growth level, predicting instead infinite growth, This latter property could easily explain reported historical findings of loco individuals measuring over 170 mm in peristomal length.

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Documento generato il 05/12/20 alle ore 18:49:45