From mechanical to chemical impact of anchoring in seagrasses: The premises of anthropogenic patch generation in Posidonia oceanica meadows

MARINE POLLUTION BULLETIN

卷:109

Article

Abadie, Arnaud^1,2,3  Lejeune, Pierre¹  Pergent, Gerard³  Gobert, Sylvie² 

[1] Stn Rech Marines & Oceanog STARESO, BP 33, F-20260 Calvi, France

[2] Univ Liege, MARE Ctr, Lab Oceanol, B6C, B-4000 Liege, Sart Tilman, Belgium

[3] Univ Corsica, CNRS, UMR SPE 6134, EqEL FRES 3041, F-20250 Corte, France

关键词: Anchoring;    Conservation;    Seagrass;    Seascape;    Patch;   

DOI  :  10.1016/j.marpolbul.2016.06.022

来源: Elsevier

【 摘 要 】

Intensive anchoring of leisure boats in seagrass meadows leads to mechanical damages. This anthropogenic impact creates bare mat patches that are not easily recolonized by the plant. Several tools are used to study human impacts on the structure of seagrass meadows but they are not able to assess the indirect and long term implication of mechanical destruction. We chose to investigate the possible changes in the substrate chemistry given contrasted boat impacts. Our observations show that hydrogen sulfide concentrations remain high at 15 and 20 m depth (42.6 mu M and 18.8 mu M) several months after the highest period of anchoring during the summer. Moreover, our multidisciplinary study reveals that anchoring impacts of large boats at 15 and 20 m depth can potentially change the seascape structure. By taking into account both structural and chemical assessments, different managing strategies must be applied for coastal areas under anthropogenic pressures. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free