INVESTIGADORES
IRIBARNE Oscar Osvaldo
artículos
Título:
Trophic relationships between a Patagonian gastropod and its epibiotic anemone revealed by using stable isotopes and direct observations
Autor/es:
ZABALA, S; BIGATTI, F; BOTTO, F; O. IRIBARNE,; GALVAN, D
Revista:
MARINE BIOLOGY
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2013 vol. 160 p. 909 - 919
ISSN:
0025-3162
Resumen:
The carnivorous snail Adelomelon ancilla
usually carries, attached to its shell, the anemone Antholoba
achates, which also lives attached to hard substrates in
the same area. Interaction between both species was studied
by stable isotopes analyses (SIA), direct observations,
and analysis of gut contents. Results did not show evidences
of dietary overlap between anemones and snails.
A. ancilla consumed mainly bivalves and secondarily
gastropods. The diet of A. achates involved sea urchins and
echiurids as main prey. The trophic niches of anemones
and snails did not overlap; the species had similar d15N
values but differences in their d13C values. Sessile and
epibiotic anemones also showed differences in their d13C
means, revealing access to different resources. Whereas
SIA provided information on trophic relationships and
structure, observation of feeding events provided details of
prey utilization patterns. Combining direct and indirect
approaches helps to overtake method weaknesses and
greatly improve dietary descriptions.