Effects of environmental variability on population dynamics of golden carpet shell clam (Polititapes aureus)
The population dynamics of the golden carpet shell clam Polititapes aureus (Gmelin, 1791) were studied over the course of six years in the ria of Arousa (Galicia, NW Spain). Density reached a value of 62.29 individuals m−2 and biomass was 76.30 g m−2. Recruitment was related to water temp...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Academia.edu Journals
2023-10-01
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| Series: | Academia Biology |
| Online Access: | https://www.academia.edu/108618140/Effects_of_environmental_variability_on_population_dynamics_of_golden_carpet_shell_clam_Polititapes_aureus_ |
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| Summary: | The population dynamics of the golden carpet shell clam Polititapes aureus (Gmelin, 1791) were studied over the course of six years in the ria of Arousa (Galicia, NW Spain). Density reached a value of 62.29 individuals m−2 and biomass was 76.30 g m−2. Recruitment was related to water temperature, to food availability measured as fluorescence and to density-dependent phenomena starting at 39 individuals m−2. The condition factor and mortality showed a clear annual periodicity, while growth rate G30 was biannual. Growth was fitted to a seasonal von Bertalanffy function, with L∞ = 43.6 mm; K = 0.360 y−1; C = 0.65 and ts = 1.21, with a confidence interval determined by bootstrapping. The instantaneous mortality rate for individuals aged 1 and 2 years was 0.94 in spring-summer and 0.14 in autumn-winter. The fishing mortality rate had little effect on the population. A model was built to explain the natural mortality rate as function of temperature, salinity, fluorescence, and the condition factor. The results allow the application of fishery management tools based on their population dynamics and to measure their effectiveness considering the environmental variability. They also show the vulnerability of these stocks to changes resulting from climate change. |
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| ISSN: | 2837-4010 |