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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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Different responses to climate change in resident and migratory birds

Different responses to climate change in resident and migratory birds

The adjustment to climate change and the differential effects of temperature on resident and migratory birds were studied using the start dates of the laying in ten long-term studies in nest-boxes in Europe with data on at least one species of resident tit ??and one species of migratory flycatcher. Resident tit populations advanced their breeding more strongly in relation to temperature increases than migratory flycatchers. The divergence was strongest in the lower latitudes where the interval between tits and flycatchers is smaller and winter conditions are more favourable for residents. The phenological adjustment of flycatchers to climate change seems to be progressively further hampered by competition with resident species. The differential effect of climate change on groups of species with superimposed reproductive ecology affects the phenological interval between them, impinging on interspecific interactions. informacion[at]ebd.csic.es Samplonius et al. (2018) Phenological sensitivity to climate change is higher in resident than in migrant bird populations among European cavity breeders; Global Change Biol https://doi.org/10.1111/gcb.14160 


https://onlinelibrary.wiley.com/doi/epdf/10.1111/gcb.14160