Browsing by Author "Regalla, A."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Adaptation of sea turtles to climate warming: Will phenological responses be sufficient to counteract changes in reproductive output?Publication . Fuentes, Mariana; Santos, Armando Jose Barsante; Abreu-Grobois, F. Alberto; Briseño‐Dueñas, R.; Al-Khayat, Jassim; Hamza, Shafeeq; Saliba, Sally; Anderson, D.; Rusenko, Kirt; Mitchell, N. J.; Gammon, Malindi Jane; Bentley, Blair P; Beton, Damla; Booth, David; Broderick, Annette; Colman, Liliana; Snape, Robin; Calderon‐Campuzano, M. F.; Cuevas, Eduardo; López-Castro, M. C.; Flores-Aguirre, Cynthia Dinorah; Mendez, Fausto; Segura‐Garcia, Y.; Ruiz‐Garcia, A.; Fossette, Sabrina; Gatto, Christopher; Reina, Richard; Girondot, Marc; Godfrey, M.; Guzman Hernandez, Vicente; Hart, Catherine Edwina; Kaska, Yakup; Lara, P.H.; Marcovaldi, Maria Angela; Leblanc, Nia; Rostal, D.; Liles, Mark; Wyneken, Jeanette; Lolavar, Alexandra; Williamson, Sean; Manoharakrishnan, Muralidharan; Pusapati, Chandana; Chatting, Mark; Mohd Salleh, Sarahaizad; Patrício, Ana Rita; Regalla, A.; Restrepo, J.; Garcia, R.; Tomillo, Pilar Santidrián; Sezgin, Çisem; Shanker, Kartik; Tapilatu, F.; Turkozan, Oguz; Valverde, Clodoaldo; Carroll, Kristina Williams; Yilmaz, Can; Tolen, Nicholas; Tucek, J.; Le Gouvello Du Timat, Diane, Zelica, Marie; Rivas, Marga; Freire, Jordana; Touron, M.; Genet, Q.; Salmon, M.; Araujo, M. R.; Freire, J. B.; Davel Castheloge, Vinicius; Jesus, Paulo Roberto; Júnior, Paulo Dias Ferreira; Paladino, Frank V.; Montero‐Flores, D.; Sözbilen, Doğan; Monsinjon, JonathanSea turtles are vulnerable to climate change since their reproductive output is influenced by incubating temperatures, with warmer temperatures causing lower hatching success and increased feminization of embryos. Their ability to cope with projected increases in ambient temperatures will depend on their capacity to adapt to shifts in climatic regimes. Here, we assessed the extent to which phenological shifts could impacts from increases in ambient temperatures (from 1.5 to 3°C in air temperatures and from 1.4 to 2.3°C in sea surface temperatures by 2100 at our sites) on four species of sea turtles, under a “middle of the road” scenario (SSP2-4.5). Sand temperatures at sea turtle nesting sites are projected to increase from 0.58 to 4.17°C by 2100 and expected shifts in nesting of 26–43 days earlier will not be sufficient to maintain current incubation temperatures at 7 (29%) of our sites, hatching success rates at 10 (42%) of our sites, with current trends in hatchling sex ratio being able to be maintained at half of the sites. We also calculated the phenological shifts that would be required (both backward for an earlier shift in nesting and forward for a later shift) to keep up with present-day incubation temperatures, hatching success rates, and sex ratios. The required shifts backward in nesting for incubation temperatures ranged from −20 to −191 days, whereas the required shifts forward ranged from +54 to +180 days. However, for half of the sites, no matter the shift the median incubation temperature will always be warmer than the 75th percentile of current ranges. Given that phenological shifts will not be able to ameliorate predicted changes in temperature, hatching success and sex ratio at most sites, turtles may need to use other adaptive responses and/or there is the need to enhance sea turtle resilience to climate warming.
- Green turtles highlight connectivity across a regional marine protected area network in west AfricaPublication . Patrício, A. R.; Beal, M.; Barbosa, C.; Diouck, D.; Godley, B. J.; Madeira, F. M.; Regalla, A.; Traoré, M. S.; Senhoury, C.; Sidina, E.; Catry, P.Networks of marine protected areas (MPAs) are invaluable for the protection of species with high dispersal capacity, yet connectivity within networks is poorly understood. We demonstrate the connectivity within the regional MPA network in West Africa (RAMPAO), mediated by the largest green turtle population in the eastern Atlantic Ocean. We equipped with satellite tags 45 female green turtles nesting in the Bijagó s Archipelago, Guinea-Bissau, and tracked them during internesting, migration, and foraging to quantify the degree of coverage the RAMPAO network provides during each of these critical periods. During the internesting period, turtles were largely concentrated around the nesting islands, with a mean of 94.8% (SD 0.1%, range: 46% - 100%, n = 40 turtles) of tracking positions falling within MPA limits. Among the 35 turtles successfully tracked into the foraging period, we identified variable migratory strategies, with 12 turtles remaining near-resident at distances of 40-90 km from breeding sites, 10 turtles migrating 300-400 km to The Gambia and Senegal, and 13 turtles traveling >1000 km to northern Mauritania. Of the 35 foraging turtles, 26 used MPAs, with a mean of 78.0% (SD 34.8%, range: 3.7% - 100%) of their tracking positions falling within the limits of RAMPAO MPAs, across Guinea-Bissau, Senegal and Mauritania. Migration corridors with high concentrations of passing turtles were mostly located nearshore, and 21% of these high passage areas fell within the MPA network. Overall, we found that this population connects five RAMPAO MPAs, yet some foraging sites (e.g., in the Bijagó s) and important migration areas (e.g., Cap-Vert peninsula) described here are currently unprotected. These results are relevant to any considerations of MPA extension or establishment within the regional network, which would contribute towards meeting the Convention on Biological Diversity targets for national marine protected area estate coverage. By documenting biological connectivity across RAMPAO, this study represents an important example of the relevance of international protected area networks for green turtle conservation and for wider conservation action at a regional scale.