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Diet of Engraulis encrasicolus in the northern Adriatic Sea (Mediterranean): ontogenetic changes and feeding selectivity (Articolo in rivista)

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Diet of Engraulis encrasicolus in the northern Adriatic Sea (Mediterranean): ontogenetic changes and feeding selectivity (Articolo in rivista) (literal)

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Borme D.; Tirelli V.; Brandt S.; Fonda Umani S.; Arneri E. (2009)
Diet of Engraulis encrasicolus in the northern Adriatic Sea (Mediterranean): ontogenetic changes and feeding selectivity
in Marine ecology. Progress series (Halstenbek); Inter-Research, Oldendorf Luhe (Germania)
(literal)

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In: Marine Ecology-Progress Series, vol. 392 pp. 193 - 209. Inter-research, 2009. (literal)

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OGS, Ist Nazl Oceanog & Geofis Sperimentale, Dipartimento Oceanog Biol, I-34014 Trieste, Italy; Oregon State Univ, Oregon Sea Grant Program, Corvallis, OR 97331 USA; Univ Trieste, Dept Life Sci, I-34143 Trieste, Italy; ISMAR-CNR Ancona, (literal)

Titolo

Diet of Engraulis encrasicolus in the northern Adriatic Sea (Mediterranean): ontogenetic changes and feeding selectivity (literal)

Abstract

Ontogenetic variation in the diet of Engraulis encrasicolus (L.) was examined in the northern Adriatic Sea, off the River Po delta, by stomach contents analysis. Anchovy (10 to 130 mm total length) were collected during a 1 wk cruise in October 2002. Feeding activity was mainly diurnal in all the length classes: stomach fullness, calculated for each 10 mm size class, was always higher during the day than at night, with maximal values measured for the 40 to 49 and 50 to 59 mm. size classes. All analysed life stages of E. encrasicolus had a strictly zooplanktivorous diet based on a few species of copepods. The principal prey of E. encrasicolus were small-sized copepods, measuring about 0.2 to 0.3 or 0.5 to 0.6 mm in prosoma length. The copepods Euterpina acutifrons and Oncaea spp. dominated anchovy diet during the day, both in terms of frequency, number and biomass, in all anchovy size classes. During the night, bivalve larvae were also important dietary items, with Oncaea spp. and E. acutifrons making up >69% of total prey number for all anchovy size classes. Within the considered size range, the dimensions of particles does not seem to be a limiting factor in food selection, and no relationship was found between anchovy length and the maximal dimension of ingested prey. Ivlev's electivity index confirmed that European anchovy was able to select specific food items and preferred small copepods such as E. acutifrons and Oncaea spp., and bivalve and decapod larvae. (literal)

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