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Impact of discards of beam trawl fishing on the nematode community from the Tagus estuary (Portugal).

Abstract：

:The impact of dead discards, originating from beam trawl fishing on the nematode community from the Tagus estuary was investigated in terms of vertical distribution of the dominant nematode groups. Sediment cores were collected from a mud-flat from the Tagus estuary. Crangoncrangon (Linnaeus, 1758) carcasses were added to the surface of the cores, simulating the settling of dead discards on the sediment. The vertical distribution of the dominant nematode groups was determined up to 4cm deep at four different moments in time post deposition (0, 2, 4 and 6h) and compared to control cores. The C.crangon addition to the sediment led to the formation of black spots and therefore oxygen depleted areas at the sediment surface. The Chromadora/Ptycholaimellus group, normally dominant at the surface layer, migrated downwards due to their high sensibility to toxic conditions. Sabatieria presented the opposite trend and became the dominant group at the surface layer. Since Sabatieria is tolerant to oxygen stressed conditions and high sulphide concentrations, we suggest that it migrated opportunistically towards an unoccupied niche. Daptonema, Metachromadora and Terschellingia did not show any vertical migration, reflecting their tolerance to anoxic and high sulphidic conditions. Our study showed that an accumulation of dead discards at the sediment surface might therefore alter the nematode community vertical distribution. This effect is apparently closely related to toxic conditions in the sediment, induced by the deposition of C.crangon at the sediment surface. These alterations might be temporal and reflect an adaptation of the nematode community to dynamic intertidal environments.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

Franco MA,Steyaert M,Cabral HN,Tenreiro R,Chambel L,Vincx M,Costa MJ,Vanaverbeke J

doi

10.1016/j.marpolbul.2008.07.003

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

1728-36

issue

10

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(08)00360-3

journal_volume

56

pub_type

杂志文章

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