Estructura poblacional y distribución espacial de los moluscos gasterópodos "Osilinus atrata" y "Osilinus sauciatus" en el intermareal rocoso de las Islas Canarias (Atlántico centro-oriental)
- Ramírez, R. 1
- Tuya, F. 1
- Sánchez-Jerez, P. 2
- Fernández-Gil, C. 1
- Bergasa, O. 1
- Haroun, R.J. 1
- Hernández-Brito, J.J. 1
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1
Universidad de Las Palmas de Gran Canaria
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Universidad de Las Palmas de Gran Canaria
Las Palmas de Gran Canaria, España
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2
Universitat d'Alacant
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ISSN: 0185-3880, 2395-9053
Year of publication: 2005
Volume: 31
Issue: 4
Pages: 697-706
Type: Article
More publications in: Ciencias marinas
Sustainable development goals
Abstract
A hierarchical sampling design was used to study the population structure and the horizontal (differences among islands, locations within islands and sites within locations) and vertical (differences among intertidal bands) distribution patterns of the gastropod molluscs "Osilinus atrata" and "O. sauciatus" along the rocky intertidal zone of the Canary Islands. Differences in the spatial patterns of abundance, size and distribution were recorded for both species. "Osilinus atrata" was more abundant than "O. sauciatus" throughout the archipelago. Its abundance varied among islands and it presented a heterogeneous distribution in the bands from one island to another, though it was more frequent in the middle and high bands. "Osilinus sauciatus" was only found at the eastern islands and did not exhibit significant differences between the bands, even though 91.35% of the individuals appeared in the high band and the rest in the middle band. On the other hand, "O. sauciatus" had a larger mean size than "O. atrata", but both species presented the largest mean sizes in the high band.