Laneri K.,CSIC - Mediterranean Institute for Advanced Studies |
Laneri K.,Fundacio Institute Catala Of Ciencies Del Clima Ic3 |
Louzao M.,CSIC - Mediterranean Institute for Advanced Studies |
Louzao M.,University of Oviedo |
And 10 more authors.
Marine Ecology Progress Series | Year: 2010
Unintended mortality in longlines emerged in the early 1990s as one of the most important threats for pelagic seabirds worldwide. Most of the studies were focused on highly developed industrial fisheries, overlooking bycatch in small-scale artisanal fisheries. However, bycatch in smallscale fisheries might have negative effects similar to those of industrial fisheries when they overlap with hotspot areas of top predators. Moreover, different types of fishing gear coexist in the same oceanographic area, particularly in highly exploited marine ecosystems such as the western Mediterranean. We quantify for the first time the influence of trawling regime on Cory's shearwater Calonectris diomedea bycatch in the western Mediterranean longline artisanal fishery. The availability of trawling discards has substantial influence on the foraging and reeding ecology of many seabirds, and trawling inactivity may drive shearwaters to seek alternative food resources, such as baits used in longline fishing. Based on our previous knowledge of the system, we also tested other variables affecting bycatch over 8 yr (1998 to 2005). Within this 2-fishery framework, we found that trawling regime, longline fishing time and breeding stage were key factors explaining shearwater attendance to longline vessels, but mainly trawling regime and fishing time increased the incidental capture of Cory's shearwaters. More specifically, during the pre-breeding and chick-rearing periods, bycatch dramatically increased during sunrise sets in the absence of trawling activity. Importantly, this study indicates the need for an integrated multi-fisheries management approach for the conservation of seabirds and highlights the necessity of banning longline fishing during periods of trawling inactivity. © Inter-Research 2010.
Guillen J.E.,Institute dEcologia Litoral |
Jimenez S.,Institute dEcologia Litoral |
Martinez J.,Institute dEcologia Litoral |
Trivino A.,Institute dEcologia Litoral |
And 3 more authors.
Thalassas | Year: 2010
The present study contains the results gathered from the programme monitoring the implantation of invasive species of algae in the Region of Valencia. The programme has been in operation since 1993 and consists of an annual inspection at 40 points considered to be at most risk along the coast, as well as responding to warnings given by entities and individuals. The programme was initially designed to detect the presence of Caulerpa taxifolia (Vahl) C.Agardh 1817, which has not been detected during any of the inspections carried out in the last 15 years. However, C. racemosa var. cylindracea (Sonder) Verlaque, Huisman & Boudouresque, 2003 was detected in 1999, more specifically on the approaches to the Port of Castellón de La Plana and since then it has expanded exponentially and is now present along the coast of all three Valencian provinces, with the area colonised being estimated at 168 Km2 in late 2008. The programme has also detected the presence of other invasive species of algae, namely Asparagopsis taxiformis (Delile) Trevisan de Saint- Léon, 1845 and Lophocladia lallemandii (Montagne) F. Schmitz, 1893, currently present exclusively in the Islas Columbretes archipelago.