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Structure, growth and secondary production of two Tyrrhenian populations of the white gorgonian Eunicella singularis (Esper 1791)
Munari, C.; Serafin, G.; Mistri, M. (2013). Structure, growth and secondary production of two Tyrrhenian populations of the white gorgonian Eunicella singularis (Esper 1791). Est., Coast. and Shelf Sci. 119: 162-166. https://dx.doi.org/10.1016/j.ecss.2013.01.007
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer
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| Trefwoorden |
Eunicella singularis (Esper, 1791) [WoRMS]
Marien/Kust |
| Author keywords |
Eunicella singularis; gorgonians; population structure; secondary production; Tyrrhenian Sea |
| Auteurs | | Top |
- Munari, C.
- Serafin, G.
- Mistri, M.
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| Abstract |
Growth and secondary production of the shallow-water gorgonian Eunicella singularis were investigated at two infralittoral rocky stations located in the Tyrrhenian Sea (Cannitello and Cape Enfola), separated by a cline of 4° latitude. Colonies were aged by counting the number of annual growth rings at the base of the skeleton. Mean annual linear growth rates were calculated by fitting a von Bertalanffy growth equation for the species. Growth rates were 3.55 and 4.52 cm yr−1 respectively. The Enfola population exhibited an age structure reflecting a past pulse in recruitment. The Cannitello population exhibited a gamma-type distribution, dominated by younger age classes, thus suggesting a continuous recruitment rate over time. The two population differed also in colony density, which was higher at Enfola. Secondary production was estimated by means of the increment-summation method, and yielded 5.6 and 3.2 g ash-free dry weight (AFDW) m−2 yr−1 for Cannitello and Enfola populations, respectively. P/B ratio was higher at Cannitello, because of the age structure of the population. Strong currents probably cause population density-thinning mechanisms, favoring a more continuous recruitment. |
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