ISSN:
1573-5117
Schlagwort(e):
macrobenthos
;
recolonization dynamics
;
anthropic impact
;
Adriatic Sea
;
Lagoon of Venice
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract Results of two investigations on the effects of disturbance on benthic communities in lagoon and coastal areas, caused by bottom fishing-gears (‘hydraulic dredge’ for clams and ‘rapido’, a kind of beam-trawl for soles and scallops employed in the Northern Adriatic sea), are given. Such gears, although characterised by different features and targets, have similar effects on the sea bottom: both produce deep furrows (7–13 cm for the ‘rapido’, up to 20 cm for the ‘hydraulic dredge’), thus affecting the texture of the bottom. In 1992 (’hydraulic dredge‘) and in 1995 (‘rapido’) two different research projects were carried out; samples of benthos were collected immediately after the passage of the gears and at fortnightly-intervals, in treated and control areas. This allowed study of the modifications of the macrobenthic communities and investigation of the short and medium-term (dredge: 60 days, ‘rapido’: 15 days) progression of the recolonization processes in the disturbed areas. These dynamics have been analysed by giving emphasis to the species and to their time-space fluctuations. It has been found that characteristically ‘non-opportunistic’ species can assume an opportunistic behaviour during the initial phase of the recolonization processes of the disturbed areas.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1017056905625
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