Estudio del contenido gástrico de la estrella de arena (Astropecten aranciacus L.) en la bahía de Alcudia (Mallorca)

The gastric content of a group of sand-starfishes (Astropecten aranciacus L.) can be taken as a slightly deformed samplc of the biocoenoscs of the sandy bottoms which they inhabit. Research of three samples of at least 25 starfishcs collected in the area of Na Borja (Alcudia Bay, Mallorca) is made. The specimens obtained are classified and their frequency is estimated.
A list of the existent species is obtained as well as the degree of agregation of the more frequent species. We observe a series of changes from one sample to another. These changes seem to be related to the variations of the  biological cycle of the found species.