Evidence of large increases in sedimentation rates due to fish trawling in submarine canyons of the Gulf of Palermo (SW Mediterranean)

MARINE POLLUTION BULLETIN

卷:172

Article

Paradis, Sarah^1,2,3  Lo Iacono, Claudio⁴  Masque, Pere^1,2,5,6  Puig, Pere⁴  Palanques, Albert⁴  Russo, Tommaso⁷ 

[1] Univ Autonoma Barcelona, Inst Environm Sci & Technol ICTA, Bellaterra 08193, Spain

[2] Univ Autonoma Barcelona, Phys Dept, Bellaterra 08193, Spain

[3] Swiss Fed Inst Technol, Dept Earth Sci, Geol Inst, CH-8092 Zurich, Switzerland

[4] CSIC, Marine Sci Inst, Barcelona 08003, Spain

[5] Edith Cowan Univ, Ctr Marine Ecosyst Res, Sch Nat Sci, Joondalup, WA 6027, Australia

[6] IAEA, 4a Quai Antoine 1er, MC-98000 Monaco, Monaco

[7] Univ Roma Tor Vergata, Dept Biol, Lab Expt Ecol & Aquaculture, I-00133 Rome, Italy

关键词: Submarine canyons;    Sedimentation rates;    Bottom trawling;    Pb-210;    NW Sicily;    Mediterranean;   

DOI  :  10.1016/j.marpolbul.2021.112861

来源: Elsevier

【 摘 要 】

Bottom trawling in submarine canyons can affect their natural sedimentation rates, but studies addressing this issue are still scarce. In the Gulf of Palermo (SW Mediterranean), bottom trawling occurs on the slope around Oreto, Arenella and Eleuterio canyons. Analyses of excess 210Pb concentrations and grain size fractions in sediment cores from their canyon axes revealed that sedimentation rates and silt contents increased in all canyons in the 1980s, due to the expansion of more powerful trawlers (>500 HP) to deeper fishing grounds. In Eleuterio and Arenella canyons, sedimentation rates increased by an order of magnitude (0.1-1.4 cm.yr(-1)), whereas they increased less (0.1-0.7 cm.yr(-1)) in Oreto Canyon, since the enhanced trawling-derived sediment fluxes into this canyon are affected by sediment resuspension from trawling along its axis. Considering the global expansion of bottom trawling, we anticipate similar alterations in other trawled canyons, with ecological consequences that should be addressed by management strategies.

【 授权许可】

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