Is the Spanish coast within the regular nesting range of the Mediterranean loggerhead sea turtle (<i>Caretta caretta</i>)?

Tòmàs, Jesús; Gazo, Manel; Alvarez, Carla N.; Gozalbes, Patricia; Perdiguero, D.; Raga, Juan Antonio; Alegre, Ferrán

doi:10.1017/s0025315408001768

Cited by 21 publications

(27 citation statements)

References 9 publications

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“…3B, Spearman rank-order correlation, N=7, rho=-0.75, P=0.06). Exceptional loggerhead nests laid on beaches of the central and western Mediterranean Sea (Sénégas et al, 2008;Tomas et al, 2008) may experience cooler incubation environments, and thus may produce male-biased hatchling sex ratios, although relative numbers of these nests are quite small.…”

Section: Hatchling Sex Ratiosmentioning

confidence: 99%

Predicting the impacts of climate change on a globally distributed species: the case of the loggerhead turtle

Witt

Hawkes

Godfrey

et al. 2010

Journal of Experimental Biology

175

159

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SummaryMarine turtles utilise terrestrial and marine habitats and several aspects of their life history are tied to environmental features that are altering due to rapid climate change. We overview the likely impacts of climate change on the biology of these species, which are likely centred upon the thermal ecology of this taxonomic group. Then, focusing in detail on three decades of research on the loggerhead turtle (Caretta caretta L.), we describe how much progress has been made to date and how future experimental and ecological focus should be directed. Key questions include: what are the current hatchling sex ratios from which to measure future climate-induced changes? What are wild adult sex ratios and how many males are necessary to maintain a fertile and productive population? How will climate change affect turtles in terms of their distribution?

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Section: Hatchling Sex Ratiosmentioning

confidence: 99%

Predicting the impacts of climate change on a globally distributed species: the case of the loggerhead turtle

Witt

Hawkes

Godfrey

et al. 2010

Journal of Experimental Biology

175

159

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“…Instead, most efforts focus on mapping individual nesting locations (e.g. Dow et al, 2007;Mingozzi et al, 2007;Tomás et al, 2008;Khan et al, 2010; but see work on olive ridley turtles in Bernardo & Plotkin, 2007), which is more likely to reflect research or survey effort, and represents only a subset of the overall suitable nesting habitat. In fact, new and important sea turtle nesting areas are still being found, even in well-populated regions (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, new and important sea turtle nesting areas are still being found, even in well-populated regions (e.g. Mingozzi et al, 2007;Patino-Martinez et al, 2008;Tomás et al, 2008;Witt et al, 2009;Khan et al, 2010). Orphan haplotypes from foraging areas also suggest important genetically distinct, but as yet unknown, nesting areas that are awaiting discovery (Laurent et al, 1998;Blumenthal et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Climate influences the global distribution of sea turtle nesting

Pike

2013

Global Ecology and Biogeography

102

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Aim To understand whether climate limits current sea turtle nesting distributions and shapes the ecological niche of the terrestrial life‐history stage of these wide‐ranging marine vertebrates. Location Coastlines world‐wide. Methods I predicted the spatial distributions of nesting habitat under current climatic conditions for seven sea turtle species using information criteria and maximum entropy modelling. I also compared niche similarity among species using three niche metrics: I, Schoener's D and relative rank. Results Sea turtles currently nest across their entire bioclimatic envelopes, with up to six species predicted to nest on a single beach. The Caribbean Sea, Gulf of Mexico and Australasia support high nesting diversity, with most regional areas supporting three to five species. Despite large overlap in nesting distributions among species, loggerhead and green turtles have the broadest environmental niches, while Kemp's ridley and flatback turtles have very narrow niches. Main conclusions The terrestrial nesting habitat of sea turtles is characterized by distinct climatic conditions, which are linked to the physical conditions necessary for eggs to hatch successfully and allow hatchlings to disperse from natal areas. Despite broad geographic patterns of overlap and similar embryonic tolerances to temperature and moisture among species, sea turtles partition habitat by nesting in different niche spaces. The tight link between current geographic patterns of nesting and climate, along with the dependence of developing embryos on nest microclimate, imply that regional or global changes in environmental conditions could differentially influence the distribution of sea turtle species under climate change. This could influence the adaptive potential of different populations, and predicting these responses before they occur will be important in mitigating the effects of climate change.

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“…In addition to other human activities such as egg predation and beach development, the incidental capture of sea turtles in global fisheries is considered a significant threat to numerous marine turtle species and populations worldwide (Hall et al, 2000;Lewison et al, 2004;Tomas et al, 2008). Specifically, shallow set longline fishing gear (o100 m) targeting broadbill swordfish (Xiphias gladius), surface-feeding tunas, and mahimahi or dolphin fish (Coryphaena hippurus) has been implicated in high rates of sea turtle interactions as a result of the shared shallow depths occupied by most hard-shelled sea turtles (Ferreira et al, 2001;Polovina et al, 2003;Swimmer et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparing the effects of offset and non‐offset circle hooks on catch rates of fish and sea turtles in a shallow longline fishery

Swimmer

Arauz²,

Wang

et al. 2010

Aquatic Conservation

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ABSTRACT1. This study compared the catch rates of targeted dolphinfish or mahimahi (Coryphaena hippurus), and sea turtles and other fish bycatch in a shallow-set Costa Rican longline fishery using 14/0 circle hooks with and without a 101 offset. The effect of hook offset on hooking location and injury in captured sea turtles, specifically if the hooking was external, in the mouth, or in the esophagus was also evaluated.2. Results were compared from six trips totalling 33 876 hooks with squid (Dosidicus gigas) used as bait. In total, mahimahi catch-per-unit-effort (CPUE, expressed as number caught per 1000 hooks) was similar between hook types (CPUE$52).3. Olive ridley sea turtles (Lepidochelys olivacea) were caught on all 42 sets. In total, 640 olive ridley turtles were caught and released alive. There were no significant differences in the number of sea turtles caught between hooks with and without an offset (CPUE$19) nor between hook type and anatomical hooking location, suggesting similar levels of injury for turtles caught on each hook type.4. These data suggest that a 101 offset on 14/0 circle hooks does not confer any selective advantages over hooks with no offset with respect to capture rates of mahimahi, sea turtles, sharks, or pelagic stingrays in a shallow set pelagic longline fishery.

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Is the Spanish coast within the regular nesting range of the Mediterranean loggerhead sea turtle (Caretta caretta)?

Cited by 21 publications

References 9 publications

Predicting the impacts of climate change on a globally distributed species: the case of the loggerhead turtle

Predicting the impacts of climate change on a globally distributed species: the case of the loggerhead turtle

Climate influences the global distribution of sea turtle nesting

Comparing the effects of offset and non‐offset circle hooks on catch rates of fish and sea turtles in a shallow longline fishery

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