Evaluación de los índices de abundancia para corvina rubia (Micropogonias furnieri) y pez palo (Percophis brasiliensis) obtenidos mediante modelos lineales generales: simulaciones de Monte Carlo y análisis de las interacciones con el factor año
Assessment of abundance indexes for whitemouth croaker (Micropogonias furnieri) and brazilian flathead (Percophis brasiliensis) obtained with general linear models: Monte Carlo simulation and analysis of the interactions with the “year” factor. The effect of interactions with the year factor on the annual index of relative abundance obtained with general linear models applied to the cath per unit of effort data of whitemouth croaker and brazilian flathead commercial fleet was evaluated applying the Monte Carlo simulation. Levels on the relative percentage of variance explained by the interactions with the year factor (%RVEAÑO) were determined, above which loss of proportionality between the relative abundance series given by the index and the real series may occur. Its effect on the estimate of parameters of resources dynamics models that may distort assessments was evaluated. It was found that, to avoid compromising estimates of the population growth intrinsic rate and the maximum sustainable yield, the %RVEAÑO for whitemouth croaker and brazilian flathead should not exceed 25% and 30%, respectively. Considering that the percentage amounts to 7.88% for whitemouth croaker and 24.54% for brazilian flathead, it follows that said indexes can be used to evaluate both resources. Results depend on the species and the dynamics model considered.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2013
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| Subjects: | Stock assessment, Abundance, Catch/effort, Simulation, Commercial species, Coastal fisheries, |
| Online Access: | http://hdl.handle.net/1834/5503 |
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| Summary: | Assessment of abundance indexes for whitemouth croaker (Micropogonias furnieri) and brazilian flathead (Percophis brasiliensis) obtained with general linear models: Monte Carlo simulation and analysis of the interactions with the “year” factor. The effect of interactions with the year factor on the annual index of relative abundance obtained with general linear models applied to the cath per unit of effort data of whitemouth croaker and brazilian flathead commercial fleet was evaluated applying the Monte Carlo simulation. Levels on the relative percentage of variance explained by the interactions with the year factor (%RVEAÑO) were determined, above which loss of proportionality between the relative abundance series given by the index and the real series may occur. Its effect on the estimate of parameters of resources dynamics models that may distort assessments was evaluated. It was found that, to avoid compromising estimates of the population growth intrinsic rate and the maximum sustainable yield, the %RVEAÑO for whitemouth croaker and brazilian flathead should not exceed 25% and 30%, respectively. Considering that the percentage amounts to 7.88% for whitemouth croaker and 24.54% for brazilian flathead, it follows that said indexes can be used to evaluate both resources. Results depend on the species and the dynamics model considered. |
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