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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	An assessment of the feeding success of young-of-the-year winter flounder (Pseudopleuronectes americanus) near a municipal pier in the Hudson River Estuary, USA
Auteurs :	J. T. Duffy-Anderson, Auteur ; K. W. Able, Auteur
Type de document :	Article
Dans :	Estuaries (24(3) JUN 2001)
Article en page(s) :	430-440
Résumé :	We examined feeding success of young-of-the-year winter flounder (Pseudopleuronectes americanus Walbaum) (20-50 mm TL) around a large, municipal pier in the Hudson River estuary, USA. Replicate, 3-h feeding experiments were conducted using benthic cages (0.64 m(2)) deployed under, at the edge, and outside of the pier during late spring and early summer in 1998 and 1999. Significantly more winter flounder caged under piers had empty stomachs ((x) over bar = 71.9%) than at the edge or in open water ((x) over bar = 29.2% and. 14.4%, respectively). Feeding intensity was significantly higher outside of the pier ((x) over bar = 0.40%) than the edge or under the pier ((x) over bar = 0.19% and 0.03%, respectively). Simultaneous with feeding experiments, benthic core samples were collected adjacent to cages. Variability was high, but abundances of prey were consistently higher under the pier ((x) over bar = 200.14 +/- 113.3 SD in 1998; 335 +/- 290.2 in 1999) than at the edge ((x) over bar = 126.6 +/- 50.2 in 1998; 70.8 +/- 68.5 in 1999) or in open water ((x) over bar = 53.4 +/- 16.1 in 1998; 123.8 +/- 193.9 in 1999). No significant differences in prey biomass were determined, suggesting that small, numerous prey were available under the pier and fewer, larger taxa were present at the edge and outside. Data indicate that feeding is suppressed among young-of-the-year winter flounder caged under piers in spite of sufficient prey available. Based on these and other experiments we submit that areas under piers are not suitable long-term habitats for juvenile fish because they interfere with normal feeding activities.

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