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Impact of fisheries on sea turtles

The bycatch of sea turtles by industrial fisheries is receiving an increasing attention in recent years due to the high impact it causes on these endangered species. This issue was evaluated in southern Spain waters that harbors an important feeding ground of loggerhead and leatherback turtles, including the endangered Eastern Atlantic loggerhead population. To quantify the impact that different fisheries represents to sea turtles, 272 fishermen answered to detailed illustrated questionnaires in all the main ports of Andalusia and Murcia (Spain) during 2014. This study has updated the knowledge of turtle bycatch in the southwestern Mediterranean revealing a widespread impact of fisheries on sea turtles. Fishermen recognized an annual catch of 2.3 turtles per boat. Considering the census of industrial fishing boats in the study area (1182), more than 2840 sea turtles could be bycaught per year in the study area. Most of captures (96.2%) were produced during the summer. These results suggest a severe impact of most of legal fisheries (surface longline, pursue seine, trawling and small scale fisheries) on loggerhead feeding grounds in the southwestern Mediterranean. Fishermen suggests that drift fishing conducted by foreign or illegal fishermen and almadrabas are also causing a significant bycatch of turtles. Several measures such as reviewing compliance of current fishing and environmental regulations, modifying turtle technics to reduce turtle bycatch (e.g. reduction of the use of squid as bait and disposal of hooks deeper in the water column), facilitating the rescue and handle of wound turtles and their transport to the port for recovery, and recognizing the efforts of anglers to perform a more sustainable fishing, are recommended to mitigate this impact. informacion[at]ebd.csic.es: Marco et al (2020) Sea turtle bycatch by different types of fisheries in southern Spain. Basic and Applied Herpetology https://doi.org/10.11160/bah.187


http://ojs.herpetologica.org/index.php/bah/article/view/187
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A global synthesis reveals biodiversity-mediated benefits for crop production

A global synthesis reveals biodiversity-mediated benefits for crop production

Human land use threatens global biodiversity and compromises multiple ecosystem functions critical to food production. Whether crop yield–related ecosystem services can be maintained by a few dominant species or rely on high richness remains unclear. Using a global database from 89 studies (with 1475 locations), the relative importance of species richness, abundance, and dominance (relative species abundance) for pollination; biological pest control, and final yields in the context of ongoing land-use change was partitioned. Pollinator and pest natural enemies richness directly supported ecosystem services in addition to and independent of abundance and dominance. Up to 50% of the negative effects of landscape simplification on ecosystem services was due to richness losses of service-providing organisms, with negative consequences for crop yields. Results confirm that the more intensive agriculture is, the more it reduces life around it. On the contrary, landscapes with mixed crops, with hedges and wasteland show a greater abundance of pollinators and up to 40% more variety of beneficial fauna. One of the many works included in this review deals with the cultivation of oilseed rape on 300 farms in western France. This study showed that crop yields and the gross income of rapeseed were greater (between 15% and 40%) in the areas with greater abundance of pollinators. Larger crops can be obtained by increasing agrochemicals or the abundance of pollinators, but the economic benefits of crops only improve with the latter as pesticides increase production costs. Maintaining the biodiversity of ecosystem service providers is therefore vital to sustain the flow of key agroecosystem benefits to society. informacion[at]ebd.csic.es: Dainese et al (2019) A global synthesis reveals biodiversity-mediated benefits for crop production. Sci Adv DOI 10.1126/sciadv.aax0121


https://advances.sciencemag.org/content/5/10/eaax0121