Larval abundance and recruitment of Carcinus maenas L. close to its southern geographic limit: a case of match and mismatch |
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Authors: | Martin Sprung |
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Institution: | (1) CCMAR UCTRA, Universidade do Algarve, Campus de Gambelas, 8000117 Faro, Portugal |
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Abstract: | In the Ria Formosa lagoon (S. Portugal), Carcinus maenas larvae have been observed only during the cold part of the year (October–May), when the water temperature stays below 23 °C. Larvae suffer high mortality during day time (about 80% during 6 h). Hence, they will only develop outside the lagoon, as proved by the observation of zoea I stages exclusively. Main recruitment starts in April, i.e. much later than the first larvae appear. Small crabs prefer Zostera noltii patches and colonize other sites when the carapace width exceeds about 5 mm. A reserve of some small crabs is found in Zostera noltii patches nearly all year round. It is postulated that one of the key factors for successful propagation of the species is a match between physiological reactions (here in particular temperature effect on reproductive cycle and larval release), and the ecological conditions for larval survival and recruitment, such as predator impact, food availability or currents. |
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Keywords: | Carcinus maenas larvae recruitment Zostera lagoon Ria Formosa |
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