Coastal development at sea turtles nesting ground: Efforts to establish a tool for supporting conservation and coastal management in northeastern Brazil

Lopez, Gustave G.; Saliés, Eduardo de C.; Lara, Paulo; Tognin, Frederico; Marcovaldi, Maria Ângela; Serafini, Thiago Zagonel

doi:10.1016/j.ocecoaman.2015.07.027

Cited by 30 publications

(18 citation statements)

References 14 publications

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“…Relocating and shading of nests at other rookeries is likely to produce different results than those reported in this study, so we emphasize that our results should be perceived as guidelines only. A vulnerability assessment framework 37 , microclimate model 38 or sensitivity map 39 may assist with gaining a thorough understanding of natural variability of beach temperatures before planning conservation strategies such as relocation or artificial shading. A further issue for consideration is the practicality of management interventions, i.e.…”

Section: Discussionmentioning

confidence: 99%

Optimism for mitigation of climate warming impacts for sea turtles through nest shading and relocation

Esteban

Laloë

Kiggen

et al. 2018

Sci Rep

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Increasing incubation temperatures may threaten the viability of sea turtle populations. We explored opportunities for decreasing incubation temperatures at a Caribbean rookery with extreme female-biased hatchling production. To investigate the effect of artificial shading, temperatures were measured under simple materials (white sheet, white sand, palm leaves). To test natural drivers of incubation temperature, temperatures were measured at average nest depths with shading on two beaches. Results from a pilot experiment suggest the most effective material was palm leaves. Shading decreased temperatures by a mean of 0.60 °C (SE = 0.10 °C, N = 20). Variation between beaches averaged 1.88 °C (SE = 0.13 °C, N = 20). We used long-term rookery data combined with experimental data to estimate the effect on sex ratio: relocation and shading could shift ratios from current ranges (97–100% female) to 60–90% female. A conservation mitigation matrix summarises our evidence that artificial shading and nest relocation are effective, low-cost, low-technology conservation strategies to mitigate impacts of climate warming for sea turtles.

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Section: Discussionmentioning

confidence: 99%

Optimism for mitigation of climate warming impacts for sea turtles through nest shading and relocation

Esteban

Laloë

Kiggen

et al. 2018

Sci Rep

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“…The green turtle ( Chelonia mydas Linnaeus, 1758) is listed as globally endangered and protected by the International Union for Conservation of Nature (IUCN), on the Red List, and by the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) under Appendix I. Recently, various attempts of in situ conservation have tried to reverse the green turtle population decline in the wild [Troëng and Rankin, ; Baudouin et al, ; Lopez et al, ]. However, the survival rate of this species is still poor.…”

Section: Introductionmentioning

confidence: 99%

Optimal-rearing density for head-starting green turtles (Chelonia mydasLinnaeus, 1758)

et al. 2016

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While ex situ conservation programs of juvenile green turtles (Chelonia mydas Linnaeus, 1758), before release to natural habitats, have been conducted in several countries, the optimal-stocking density for husbandry has not yet been reported. The optimization of stocking density was the main purpose of this study. The 15-day-old post-hatching turtles (29.30 ± 0.05 g body weight) were reared in round fiberglass tanks at various stocking densities including 20 turtles/m (20TM), 40 turtles/m (40TM), 60 turtles/m (60TM), and 80 turtles/m (80TM), over an 8-week trial. Water quality, survival, growth performance, feed utilization, aggressive behavior, fecal digestive enzymes, and hematological parameters were compared between the treatments, and were used as indicators of a successful captive rearing program. The water quality across the four treatments was in the standard range, but a high-stocking density reduced the quality significantly. No mortality was observed in any treatment group. Superior growth and feed utilization were only observed with the 40TM treatment, relative to the others (P < 0.05). The turtles in this group had no aggressive behavior, as indicated by observing hind limb biting. This treatment manipulated the level of proteolytic activity of pepsin and trypsin in response to density stressor, but not amylase, lipase, and chymotrypsin. The 40TM treatment also maintained the hematological characteristics, indicating no negative effects on health status. Overall, the findings indicate that the captivity program of post-hatching turtles at 40 turtles/m is the preferred option in their head-started propagation, as well as in public displays in zoos or aquaria. Zoo Biol. 35:454-461, 2016. © Wiley Periodicals, Inc.

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“…The human population in Brazil has grown considerably throughout the study period and much of the population growth was seen in coastal areas, where the largest urban centres are currently located (Instituto Brasileiro de Geografia e Estatística 2013). With an extensive and diverse coastline, coastal development and artificial lighting have evolved distinctly among regions in Brazil, mostly driven by tourism (Lopez et al 2015), industrial activities or the development of the communities themselves.…”

Section: Discussionmentioning

confidence: 99%

Assessing coastal artificial light and potential exposure of wildlife at a national scale: the case of marine turtles in Brazil

Colman

Lara²,

Bennie

et al. 2020

Biodivers Conserv

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Coastal areas provide critical nesting habitat for marine turtles. Understanding how artificial light might impact populations is key to guide management strategies. Here we assess the extent to which nesting populations of four marine turtle species-leatherback (Dermochelys coriacea), olive ridley (Lepidochelys olivacea), hawksbill (Eretmochelys imbricata) and two subpopulations of loggerhead (Caretta caretta) turtles-are exposed to light pollution across 604 km of the Brazilian coast. We used yearly night-time satellite images from two 5-year periods (1992-1996 and 2008-2012) from the US Air Force Defense Meteorological Satellite Programme (DMSP) to determine the proportion of nesting areas that are exposed to detectable levels of artificial light and identify how this has changed over time. Over the monitored time-frame, 63.7% of the nesting beaches experienced an increase in night light levels. Based on nest densities, we identified 54 reproductive hotspots: 62.9% were located in areas potentially exposed to light pollution. Light levels appeared to have a significant effect on nest densities of hawksbills and the northern loggerhead turtle stock, however high nest densities were also seen in lit areas. The status of all species/subpopulations has improved across the time period despite increased light levels. These findings suggest that (1) nest site selection is likely primarily determined by variables other than light and (2) conservation strategies in Brazil appear to have been successful in contributing to reducing impacts on nesting beaches. There is, however, the possibility that light also affects hatchlings in coastal waters, and impacts on population recruitment may take longer to fully manifest in nesting numbers. Recommendations are made to further this work to provide deeper insights into the impacts of anthropogenic light on marine turtles. Keywords Artificial light • Coastal development • Remote sensing • Loggerhead turtle • Hawksbill turtle • Olive ridley turtle • Leatherback turtle Communicated by David Hawksworth.

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Coastal development at sea turtles nesting ground: Efforts to establish a tool for supporting conservation and coastal management in northeastern Brazil

Cited by 30 publications

References 14 publications

Optimism for mitigation of climate warming impacts for sea turtles through nest shading and relocation

Optimism for mitigation of climate warming impacts for sea turtles through nest shading and relocation

Optimal-rearing density for head-starting green turtles (Chelonia mydasLinnaeus, 1758)

Assessing coastal artificial light and potential exposure of wildlife at a national scale: the case of marine turtles in Brazil

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