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The area south of the Po River delta (Italy) is a hot spot for strandings of loggerhead sea turtles

Published online by Cambridge University Press:  12 October 2023

Luca Marisaldi Open the ORCID record for Luca Marisaldi [Opens in a new window] ,
Andrea Torresan  and
Andrea Ferrari
Luca Marisaldi
Affiliation:
TAO Turtles of the Adriatic Organization, Via Tanari 431/A, 40024, Castel San Pietro Terme (BO), Emilia-Romagna, Italy
Andrea Torresan
Affiliation:
TAO Turtles of the Adriatic Organization, Via Tanari 431/A, 40024, Castel San Pietro Terme (BO), Emilia-Romagna, Italy
Andrea Ferrari*
Affiliation:
TAO Turtles of the Adriatic Organization, Via Tanari 431/A, 40024, Castel San Pietro Terme (BO), Emilia-Romagna, Italy
*
Corresponding author: Andrea Ferrari; Email: [email protected]
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Abstract

The northern Adriatic Sea is an important foraging ground for the loggerhead sea turtle Caretta caretta (Linnaeus, 1758) within the Mediterranean Sea. Here, stranding patterns of loggerhead sea turtles were examined over a four-year period (2019–2022) along a short (17 km) stretch of the Italian coast south of the Po River delta. A total of 355 records (alive, n = 24; dead, n = 331) were analysed, and the curved carapace lengths (CCL, notch to tip, cm) mainly reflected large juveniles and sub-adults (average CCL = 57.2 cm; 95% CI = 55.6–58.7). The month of July was identified as the critical month with the highest number of strandings, mirroring migratory processes towards this area during warmer months. The number of stranded turtles•km−1 as well as the absolute number of strandings along the short stretch of the coast might suggest this area as the most impacted in the Mediterranean Sea. This research emphasizes that human activities in the waters south of the Po River delta, particularly trawl fishing, are the primary cause of loggerhead sea turtle strandings and that tracking stranding patterns can offer valuable information about the geographic ranges, seasonal movements, and life cycles of this species.

Keywords

Adriatic SeaFishery InteractionLoggerhead Sea TurtlePo River DeltaStrandings
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 103 , 2023 , e81
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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References

Affronte, M and Scaravelli, D (2001) Analysis of stranded sea turtles in the north-western Adriatic Sea. Zoology in the Middle East 24, 101–108.CrossRefGoogle Scholar
Almpanidou, V, Tsapalou, V, Chatzimentor, A, Cardona, L, Claro, F, Hostetter, P, Kaska, Y, Liu, W, Mansui, J, Miliou, A, Pietroluongo, G, Sacchi, J, Sezgin, Ç, Sözbilen, D and Mazaris, AD (2022) Foraging grounds of adult loggerhead sea turtles across the Mediterranean Sea: Key sites and hotspots of risk. Biodiversity and Conservation 31, 143–160.CrossRefGoogle Scholar
Başkale, E, Sözbilen, D, Katılmış, Y, Azmaz, M and Kaska, Y (2018) An evaluation of sea turtle strandings in the Fethiye-Göcek Specially Protected Area: an important foraging ground with an increasing mortality rate. Ocean & Coastal Management 154, 26–33.CrossRefGoogle Scholar
Bellido, JJ, Castillo, JJ, Pinto, F, Martín, JJ, Mons, JL, Báez, JC and Real, R (2010) Differential geographical trends for loggerhead turtles stranding dead or alive along the Andalusian coast, southern Spain. Journal of the Marine Biological Association of the United Kingdom 90, 225–231.CrossRefGoogle Scholar
Bellido López, JJ, Torreblanca, E, Baez, JC and Camiñas, JA (2018) Sea turtles in the eastern margin of the North Atlantic: The northern Ibero-Moroccan Gulf as an important neritic area for sea turtles. Mediterranean Marine Science 19, 662–672.Google Scholar
Belmahi, AE, Belmahi, Y, Benabdi, M, Bouziani, AL, Darna, SA, Bouslah, Y, Bendoula, M and Bouderbala, M (2020) First study of sea turtle strandings in Algeria (western Mediterranean) and associated threats: 2016–2017. Herpetozoa 33, 113–120.CrossRefGoogle Scholar
Bertuccio, V, Costantini, F, Angelini, V, Furii, G, Gobic, K and Abbiati, M (2019) Haplotype and biometric patterns in loggerhead turtles from the Adriatic foraging ground. Journal of Sea Research 147, 1–9.CrossRefGoogle Scholar
Bonanomi, S, Moro, F, Colombelli, A, Pulcinella, J and Fortuna, CM (2022) A 14-year time series of marine megafauna bycatch in the Italian midwater pair trawl fishery. Scientific Data 9, 51.CrossRefGoogle ScholarPubMed
Cambiè, G, Sánchez-Carnero, N, Mingozzi, T, Muiño, R and Freire, J (2013) Identifying and mapping local bycatch hotspots of loggerhead sea turtles using a GIS-based method: Implications for conservation. Marine Biology 160, 653–665.CrossRefGoogle Scholar
Casale, P (2011) Sea turtle by-catch in the Mediterranean. Fish and Fisheries 12, 299–316.CrossRefGoogle Scholar
Casale, P, Affronte, M, Insacco, G, Freggi, D, Vallini, C, Pino D'Astore, P, Basso, R, Paolillo, G, Abbate, G and Argano, R (2010) Sea turtle strandings reveal high anthropogenic mortality in Italian waters. Aquatic Conservation: Marine and Freshwater Ecosystems 20, 611–620.CrossRefGoogle Scholar
Casale, P, Affronte, M, Scaravelli, D, Lazar, B, Vallini, C and Luschi, P (2012) Foraging grounds, movement patterns and habitat connectivity of juvenile loggerhead turtles (Caretta caretta) tracked from the Adriatic Sea. Marine Biology 159, 1527–1535.CrossRefGoogle Scholar
Casale, P, Broderick, A, Camiñas, J, Cardona, L, Carreras, C, Demetropoulos, A, Fuller WJ, Godley BJ, Hochscheid, S, Kaska, Y, Lazar, B, Margaritoulis, D, Panagopoulou, A, Rees AF, Tomás, J and Türkozan, O (2018) Mediterranean Sea turtles: Current knowledge and priorities for conservation and research. Endangered Species Research 36, 229–267.CrossRefGoogle Scholar
Casale, P, Freggi, D, Basso, R and Argano, R (2005) Size at male maturity, sexing methods and adult sex ratio in loggerhead turtles (Caretta caretta) from Italian waters investigated through tail measurements. The Herpetological Journal 15, 145–148.Google Scholar
Casale, P, Laurent, L and De Metrio, G (2004) Incidental capture of marine turtles by the Italian trawl fishery in the north Adriatic Sea. Biological Conservation 119, 287–295.CrossRefGoogle Scholar
Casale, P, Mazaris, AD and Freggi, D (2011) Estimation of age at maturity of loggerhead sea turtles Caretta caretta in the Mediterranean using length-frequency data. Endangered Species Research 13, 123–129.CrossRefGoogle Scholar
Casale, P, Mazaris, AD, Freggi, D, Vallini, C and Argano, R (2009) Growth rates and age at adult size of loggerhead sea turtles (Caretta caretta) in the Mediterranean Sea, estimated through capture-mark-recapture records. Scientia Marina 73, 589–595.CrossRefGoogle Scholar
Corsini-Foka, M, Kondylatos, G and Santorinios, E (2013) Increase of sea turtles stranding records in Rhodes Island (eastern Mediterranean Sea): Update of a long-term survey. Journal of the Marine Biological Association of the United Kingdom 93, 1991–2002.CrossRefGoogle Scholar
Dimitriadis, C, Mazaris, AD, Katsanevakis, S, Iosifakis, A, Spinos, E, Kalli, E, Sourbès, L, Ghinis, S, Kapellaki, K, Mpeka, E, Evagelopoulos, A and Koutsoubas, D (2022) Stranding records and cumulative pressures for sea turtles as tools to delineate risk hot spots across different marine habitats. Ocean & Coastal Management 217, 106017.CrossRefGoogle Scholar
Domènech, F, Aznar, FJ, Raga, JA and Tomás, J (2019) Two decades of monitoring in marine debris ingestion in loggerhead sea turtle, Caretta caretta, from the western Mediterranean. Environmental Pollution 244, 367–378.CrossRefGoogle ScholarPubMed
Fortuna, CM, Vallini, C, Filidei, E, Ruffino, M, Consalvo, I, Di Muccio, S, Gion, C, Scacco, U, Tarulli, E, Giovanardi, O and Mazzola, A (2010) By-catch of cetaceans and other species of conservation concern during pair trawl fishing operations in the Adriatic Sea (Italy). Chemistry and Ecology 26, 65–76.CrossRefGoogle Scholar
Franchini, D, Valastro, C, Ciccarelli, S, Trerotoli, P, Paci, S, Caprio, F, Salvemini, P, Lucchetti, A and Di Bello, A (2021) Analysis of risk factors associated with gas embolism and evaluation of predictors of mortality in 482 loggerhead sea turtles. Scientific Reports 11, 22693.CrossRefGoogle ScholarPubMed
Hama, FL, Karaica, D, Karaica, B, Rodić, P, Jelić, K, Mahečić, I and Jelić, D (2020) Sea turtle strandings, sightings and accidental catch along the Croatian Adriatic coast. Mediterranean Marine Science 21, 452–459.Google Scholar
ISPRA (2013) Linee Guida per il recupero, soccorso, affidamento e gestione delle tartarughe marine ai fini della riabilitazione e per la manipolazione a scopi scientifici.Google Scholar
Karaa, S, Jribi, I and Bradai, MN (2015) Results of seven years of follow up of marine turtle strandings in the Gulf of Gabes (Tunisia). In Proceedings of the 35th Annual Symposium on Sea Turtle Biology and Conservation. Dalaman, Muğla, Turkey, p. 103.Google Scholar
Lazar, B, Gracan, R, Katic, J, Zavodnik, D, Jaklin, A and Tvrtkovic, N (2011) Loggerhead sea turtles (Caretta caretta) as bioturbators in neritic habitats: An insight through the analysis of benthic molluscs in the diet. Marine Ecology 32, 65–74.CrossRefGoogle Scholar
Lazar, B, Margaritoulis, D and Tvrtković, N (2004) Tag recoveries of the loggerhead sea turtle Caretta caretta in the eastern Adriatic Sea: Implications for conservation. Journal of the Marine Biological Association of the United Kingdom 84, 475–480.CrossRefGoogle Scholar
Lejeusne, C, Chevaldonné, P, Pergent-Martini, C, Boudouresque, CF and Pérez, T (2010) Climate change effects on a miniature ocean: The highly diverse, highly impacted Mediterranean Sea. Trends in Ecology & Evolution 25, 250–260.CrossRefGoogle ScholarPubMed
Lucchetti, A, Bargione, G, Petetta, A, Vasapollo, C and Virgili, M (2019) Reducing Sea turtle bycatch in the Mediterranean mixed demersal fisheries. Frontiers in Marine Science 6, 387.CrossRefGoogle Scholar
Lucchetti, A, Pulcinella, J, Angelini, V, Pari, S, Russo, T and Cataudella, S (2016) An interaction index to predict turtle bycatch in a Mediterranean bottom trawl fishery. Ecological Indicators 60, 557–564.CrossRefGoogle Scholar
Lucchetti, A and Sala, A (2010) An overview of loggerhead sea turtle (Caretta caretta) bycatch and technical mitigation measures in the Mediterranean Sea. Reviews in Fish Biology and Fisheries 20, 141–161.Google Scholar
Lucchetti, A, Vasapollo, C and Virgili, M (2017) Sea turtles bycatch in the Adriatic Sea set net fisheries and possible hot-spot identification. Aquatic Conservation: Marine and Freshwater Ecosystems 27, 1176–1185.CrossRefGoogle Scholar
Luschi, P, Mencacci, R, Vallini, C, Ligas, A, Lambardi, P and Benvenuti, S (2013) Long-term tracking of adult Loggerhead Turtles (Caretta caretta) in the Mediterranean Sea. Journal of Herpetology 47, 227–231.CrossRefGoogle Scholar
Maesano, G, Di Vita, G, Chinnici, G, Pappalardo, G and D'Amico, M (2020) The role of credence attributes in consumer choices of sustainable fish products: a review. Sustainability 12, 10008.CrossRefGoogle Scholar
Margaritoulis, D, Argano, R, Baran, I, Bentivegna, F, Bradai, MN, Camiñas, JA, Casale, P, De Metrio, G, Demetropoulos, A, Gerosa, G, Godley, BJ, Haddoud, DA, Houghton, J, Laurent, L and Lazar, B (2003) Loggerhead turtles in the Mediterranean Sea: present knowledge and conservation perspectives. In Bolten, A and Witherington, B (eds), Biology and Conservation of Loggerhead Sea Turtles. Washington DC, USA: Smithsonian Institution Press, pp. 175–198.Google Scholar
Mghili, B, Benhardouze, W, Aksissou, M and Tiwari, M (2023) Sea turtle strandings along the Northwestern Moroccan coast: Spatio-temporal distribution and main threats. Ocean and Coastal Management 237, 106539.CrossRefGoogle Scholar
Pulcinella, J, Bonanomi, S, Colombelli, A, Fortuna, CM, Moro, F, Lucchetti, A and Sala, A (2019) Bycatch of loggerhead turtle (Caretta caretta) in the Italian Adriatic midwater pair trawl fishery. Frontiers in Marine Science 6, 1–11.CrossRefGoogle Scholar
Ramírez, F, Coll, M, Navarro, J, Bustamante, J and Green, AJ (2018) Spatial congruence between multiple stressors in the Mediterranean Sea may reduce its resilience to climate impacts. Scientific Reports 8, 14871.CrossRefGoogle ScholarPubMed
R Core Team (2021) R: A Language and Environment for Statistical Computing. Vienna, Austria: R Foundation for Statistical Computing.Google Scholar
Sala, A, Lucchetti, A and Affronte, M (2011) Effects of turtle excluder devices on bycatch and discard reduction in the demersal fisheries of Mediterranean Sea. Aquatic Living Resources 24, 183–192.CrossRefGoogle Scholar
Sasso, CR and Epperly, SP (2006) Seasonal sea turtle mortality risk from forced submergence in bottom trawls. Fisheries Research 81, 86–88.CrossRefGoogle Scholar
Smith, JA, Tommasi, D, Welch, H, Hazen, EL, Sweeney, J, Brodie, S, Muhling, B, Stohs, SM and Jacox, MG (2021) Comparing dynamic and static time-area closures for bycatch mitigation: A management strategy evaluation of a swordfish fishery. Frontiers in Marine Science 8, 1–19.CrossRefGoogle Scholar
Tolve, L, Casale, P, Formia, A, Garofalo, L, Lazar, B, Natali, C, Novelletto, A, Vallini, C, Bužan, E, Chelazzi, G, Gaspari, S, Fortuna, C, Kocijan, I, Marchiori, E, Novarini, N, Poppi, L, Salvemini, P and Ciofi, C (2018) A comprehensive mitochondrial DNA mixed-stock analysis clarifies the composition of loggerhead turtle aggregates in the Adriatic Sea. Marine Biology 165, 68.CrossRefGoogle Scholar
Tomás, J, Gozalbes, P, Raga, J and Godley, B (2008) Bycatch of loggerhead sea turtles: Insights from 14 years of stranding data. Endangered Species Research 5, 161–169.CrossRefGoogle Scholar
Türkozan, O, Özdilek, ŞY, Ergene, S, Uçar, AH, Sönmez, B, Yilmaz, C, Kaçar, Y and Aymak, C (2013) Strandings of loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtles along the eastern Mediterranean coast of Turkey. Herpetological Journal 23, 11–15.Google Scholar
Zbinden, JA, Aebischer, A, Margaritoulis, D and Arlettaz, R (2008) Important areas at sea for adult loggerhead sea turtles in the Mediterranean Sea: Satellite tracking corroborates findings from potentially biased sources. Marine Biology 153, 899–906.CrossRefGoogle Scholar