Food preferences of the sea urchin Diadema antillarum in Gran Canaria (Canary Islands, central-east Atlantic Ocean)
نویسندگان
چکیده
منابع مشابه
Actual status of the sea urchin Diadema aff. antillarum populations and macroalgal cover in marine protected areas compared to a highly fished area (Canary Islands-eastern Atlantic Ocean)
1. The aim was to determine the status of subtidal rocky benthic assemblages in three marine protected areas (MPAs) of the Canary Islands: (1) La Graciosa; (2) Mar de Las Calmas; (3) La Palma. Sea urchin (Diadema aff. antillarum) populations and non-crustose macroalgal cover were surveyed, and used as an indicator of conservation status in the three MPAs as well as in a highly fished area (HFA-...
متن کاملNeoparamoeba branchiphila infections in moribund sea urchins Diadema aff. antillarum in Tenerife, Canary Islands, Spain.
A total of 109 sea urchins from 3 species collected in 2 localities off the coast of Tenerife Island, Spain, were examined for the presence of free-living amoebae in their coelomic fluid. Amoeba trophozoites were isolated exclusively from moribund individuals of long-spined sea urchins Diadema aff. antillarum (Philippi) (Echinoidea, Echinodermata) that manifested lesions related to sea urchin b...
متن کاملSpatial and seasonal variation of the gonad index of Diadema antillarum (Echinodermata: Echinoidea) in the Canary Islands
The sea urchin Diadema antillarum Philippi has a tropical-subtropical amphiatlantic distribution. According to Lessios et al. (2001), there are two genetically separate forms, one from the western and central Atlantic (D. antillarum-a) and one from the eastern Atlantic (D. antillarum-b). The latter form is found from the Madeira Archipelago to the Gulf of Guinea, including the Selvages, Canary ...
متن کاملThe occurrence of melanin in the sea-urchin, Diadema antillarum Philippi.
The characteristic dark color of Diadema antillarum is chiefly attributable to a black pigment, most of which is contained in large epidermal chromatophores (see Fig. 1). A red pigment is also present, but is easily separable from the black, being readily soluble in ethanol and acetone, whereas the black is not. The nature of the red pigment is unknown and we have not studied its properties. Co...
متن کاملInfluence of wave exposure and habitat complexity in determining spatial variation of the sea urchin Diadema aff. antillarum (Echinoidea: Diadematidae) populations and macroalgal cover (Canary Islands - Eastern Atlantic Ocean)
Diadema aff. antillarum performs a key role in organizing and structuring rocky macroalgae assemblages in the Canary Islands; increased sea urchin population density can result in the formation of rocky grounds covered with crustose algae. In the Canary Islands this type of system alternates with non-crustose macroalgal systems. However, understanding of the process controlling formation, persi...
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ژورنال
عنوان ژورنال: Journal of the Marine Biological Association of the United Kingdom
سال: 2001
ISSN: 0025-3154,1469-7769
DOI: 10.1017/s0025315401004672