Feeding habits of the peracarid crustaceans associated to the alga Fucus spiralis in Tarifa Island, Cádiz (Southern Spain)
2012; University of Granada; Issue: 23 Linguagem: Inglês
ISSN
1130-4251
AutoresIrene T. Roca, José M. Guerra‐García,
Tópico(s)Marine and coastal ecosystems
ResumoespanolThe intertidal alga Fucus spiralis (Linnaeus, 1753) hosts an important mobile associated macrofauna, composed mainly of peracarid crustaceans such as the amphipod Hyale perieri (Lucas, 1849), the isopods Dynamene bidentata (Adams, 1800) and Ischyromene lacazei Racovitza, 1908 and the tanaid Tanais dulongii (Audouin, 1826). In the present study, we explored the feeding habits of these peracarid crustaceans associated to F. spiralis in Tarifa Island. The analysis of gut contents revealed that the community of F. spiralis is dominated by herbivorous, feeding mainly on the own algae along all year round. As expected, taking into consideration that F. spiralis inhabit the upper levels of the intertidal and it is emerged most of the day, detritus collected from the water column was very scarce in the gut of examined species. The amphipod H. perieri, the dominant species, fed also on crustaceans besides the fucoid algae, especially during the warmer season. Dinoflagellates, diatoms and vorticellids were also present in lower proportions. Further experimental studies are needed to better understand the strong effect of associated herbivorous on the growth and dynamics of F. spiralis. EnglishEl alga intermareal Fucus spiralis (Linnaeus, 1753) alberga una macrofauna movil asociada importante, constituida fundamentalmente por crustaceos peracaridos como el anfipodo Hyale perieri (Lucas, 1849), los isopodos Dynamene bidentata (Adams, 1800) e Ischyromene lacazei Racovitza, 1908 y el tanaidaceo Tanais dulongii (Audouin, 1826). En el presente estudio, exploramos la alimentacion de los peracaridos asociados a F. spiralis en la Isla de Tarifa. El analisis de los contenidos estomacales revelo que la comunidad de F. spiralis esta dominada por herbivoros, que se alimentan del alga durante todo el ano. Como cabria esperar, teniendo en cuenta que F. spiralis vive en los niveles superiores del intermareal en emersion la mayor parte del dia, se encontro poco detrito procedente de la columna de agua en las especies examinandas. El anfipodo H. perieri, la especie dominante, se alimento tambien de crustaceos ademas de alga, especialmente durante la estacion calida. Los dinoflagelados, diatomeas y vorticelidos tambien estuvieron presentes, aunque en proporciones menores. Se requieren estudios experimentales para comprender mejor el fuerte efecto de la presion de herbivoria sobre el crecimiento y dinamica de F. spiralis.
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