Trawling disturbance effects on the trophic ecology of two co-generic Astropectinid species

M. C. Mangano, Michel J. Kaiser, E. M. D. Porporato, G. I. Lambert, N. Spanò

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Physical disturbance by trawling can have both negative and positive effects on populations of scavenging benthic organisms. In the present study the impact of fishing activity on feeding behaviour of the two Astropectinids, Astropecten bispinosus and A. irregularis, was assessed based on stomach contents analysis. The study was carried out along trawled seabed highlighting the positive response of the two facultative scavengers to carrion generated by trawl disturbance. Furthermore, there was greater food specialization in areas that were more heavily exploited by trawling. This specialisation could be linked to the availability of certain prey that results from the passage of fishing gears across the seabed. Interestingly, differences between the two species analysed have been highlighted in term of population dynamic, feeding rate, diet composition and diet diversity, testifying their capacity to coexist in the same fishing grounds.

Original languageEnglish
Pages (from-to)538-549
Number of pages12
JournalMediterranean Marine Science
Volume16
Issue number3
DOIs
Publication statusPublished - 2015

Keywords

  • Ecosystem approach
  • Energy subsidy
  • Scavengers
  • Southern Tyrrhenian Sea
  • Stomach contents analysis
  • Vessel Monitoring System data

ASJC Scopus subject areas

  • Oceanography
  • Environmental Engineering
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

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