Demography and population structure of Northeastern mediterranean monk seal population

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Published: Jan 27, 2021
DOI: https://doi.org/10.12681/mms.21913
Keywords:
Mediterranean monk seal Photo-id Camera traps Northeastern Mediterranean.
MERVE KURT
Institute of Marine Sciences, Middle East Technical University, Mersin, 33731, Turkey
https://orcid.org/0000-0003-3298-4027
ALI CEMAL GÜCÜ
Institute of Marine Sciences, Middle East Technical University, Mersin, 33731, Turkey
https://orcid.org/0000-0001-9727-5358
Abstract

The Northeastern Mediterranean coasts that border southern Turkey host one of the last strongholds for the survival of the endangered Mediterranean monk seal (Monachus monachus, 1779). The seal colonies inhabiting south coast of Turkey have been studied since 1994 through various short-term research projects focusing on distinct small populations that were thought to be isolated. In this study, the entire extent of the area was monitored approximately for 3 years (between 2015 and 2018) with camera traps places in 20 caves known to be actively used by the seals. A total of 7014 images taken throughout the study period, along with 25,100 images taken previously, were used to identify the seals inhabiting the area.  In total, 37 individuals were identified based on the natural marks on the body. Based on photo-identified seals, a mark-recapture method was applied to estimate the total population size within the Northeastern Mediterranean. The overall population size was found to be 46 (SE=7.7) in the case of closed population and 53(SE=34.8) in the case of open population during the study period.  The range of identified seals was almost six times larger than previously documented in the same area, reaching distances up to 245 km. The population estimate indicated a decrease in population size compared to previous studies.  Finally, the study emphasises the importance of long-term monitoring studies elucidating changes in the demographic parameters in relation to threats posed, rather than cut-paste measurement suggestions which are not applicable in reality, while structuring the conservation actions targeting survival of this highly endangered species.

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Author Biographies
MERVE KURT, Institute of Marine Sciences, Middle East Technical University, Mersin, 33731, Turkey
Marine Biology and Fisheries
ALI CEMAL GÜCÜ, Institute of Marine Sciences, Middle East Technical University, Mersin, 33731, Turkey
Marine Biology and Fisheries
References
Abou-Zahra, A., 2013. Rare and pregnant monk seal falls victim to Arab instability. International Fund for Animal Welfare. http://www.ifaw.org/unitedkingdom/news/rare-and-pregnant- monk-seal-falls-victim-arab-instability (Accessed 10 April 2019).
Adamantopoulou, S., Androukaki, E., Dendrinos, P., Kotomatas, S., Paravas, V. et al., 2011. Movements of Mediterranean monk seals (Monachus monachus) in the eastern Mediterranean Sea. Aquatic Mammals, 37 (3), 256-261.
Anonymous, (2010) Seal sightings in Lebanon. The Monachus Guardian. https://monachus-guardian.org/wordpress/ 2010/09/12/seal-sightings-in-lebanon/ (Accessed 5 February 2019).
Badosa, E., Pastor, T., Gazo, M., Aguilar, A., 2006. Moult in the Mediterranean monk seal from Cap Blanc, Western Sahara. African Zoology, 41 (2), 183-192.
Brown, J. H., Kodric-Brown, A., 1977. Turnover rates in insular biogeography: effect of immigration on extinction. Ecology 58 (2), 445-449.
Demetropoulos, A., 2011. National action plan for the conservation of the Mediterranean monk seal in Cyprus. RAC/ SPA, N20/RAC/SPA_2011, 24 p.
Dendrinos, P., Tounta, E., Kotomatas, S., 1999. A Field Method for AgeEstimation of the Mediterranean Monk Seal Pups. 48. In: 13th Biennial Conferenceon the Biology of Marine Mammals, Maui, Hawaii, 28 November-3 December 1999. Monachus Guardian, Greece (12.08.2019, https://www.monachus- guardian.org/mguard06/06scien2.htm ).
Forcada, J., Aguilar, A., 2000. Use of photographic identification in capture‐recapture studies of Mediterranean monk seals. Marine Mammal Science, 16 (4), 767-793.
Galatius, A., Ahola, M., Härkönen, T., Jüssi, I., Karlsson, O. et al., 2015. Guidelines for Seal abundance monitoring in the HELCOM area 2014. HELCOM, 11 pp.
Gazo, M., Layna, J. F., Aparicio, F., Cedenilla, M. A., González, L. M. et al., 1999. Pupping season, perinatal sex ratio and natality rates of the Mediterranean monk seal (Monachus monachus) from the Cabo Blanco colony. Journal of Zoology, 249 (4), 393-401.
Gazo, M., Aparicio, F., Cedenilla, M.A., Layna, J.F., González, L.M., 2000. Pup survival in the Mediterranean monk seal (Monachus monachus) colony at Cabo Blanco Peninsula (Western Sahara-Mauritania). Marine Mammal Science, 16 (1), 158-168.
Gücü, A. C., 2003. The Cilician monk seal colony is growing. The Monachus Guardian, 6 (2), 51-53.
Gücü, A.C., Erkan, F., 2005. A holistic approach for the conservation of the Mediterranean monk seal on the Cilician coast of Turkey. 1-11. In: INOC International Workshop on Marine and Coastal Protected Areas. 23-25 March 2005, Meknes, Morocco.
Gücü, A.C., Ok, M., Orek, H., 2003. Seeking answers in the Gulf of Iskenderun: do eastern Mediterranean monk seals migrate. The Monachus Guardian, 6 (2), 54-56.
Gücü, A.C., Ok, M., 2004. Arab the pilgrim. The Monachus Guardian, 7 (1), 1-4.
Gücü, A.C., Gücü, G., Orek, H., 2004. Habitat use and preliminary demographic evaluation of the critically endangered Mediterranean monk seal (Monachus monachus) in the Cilician Basin (Eastern Mediterranean). Biological Conservation, 116 (3), 417-431.
Gücü, A.C., 2009. Preliminary study on the effects of photo traps used to monitor Mediterranean monk seals Monachus monachus. Endangered Species Research, 10 (1), 281-285.
Gücü, A.C., Ok, M., Sakinan, S., 2009a. A Survey of the critically endangered Mediterranean monk seal, Monachus monachus (Hermann, 1779) along the coast of Northern Cyprus. Israel Journal of Ecology & Evolution, 55 (1), 77-82.
Gücü, A.C., Sakinan, S., Ok, M., 2009b. Occurrence of the critically endangered Mediterranean Monk Seal, Monachus monachus, at Olympos-Beydağları National Park, Turkey. (Mammalia: Phocidae). Zoology in the Middle East, 46 (1), 3-8.
Gücü, A.C., Ok, M., Sakınan, S., Saydam, G., Akkuş, G., Kurmuş, N., 2012. Kuzeydoğu Akdeniz Fok (Monachus monachus) Popülasyonu Yaşamsallık Analizi. TUBITAK, Project report, No 111T681, 45 pp.
Gücü A.C., Ok, M., Sakınan S., Saydam G., Akkuş G., Kurmuş N., 2015. Mapping the habitats of the critically endangered Mediterranean monk seal (Monachus monachus) in the Northeastern Mediteranean. TUBITAK, Project report, No 114Z573, 70 pp.
Google Earth V 7.3.2.5491, 2018. https://www.google.com/ earth/index.html (Accessed February 2019).
Harding, K.G., McNamara, J.M., 2002. A unifying framework for metapopulation dynamics. The American Naturalist, 160 (2), 173-185.
Hiby, A.R., Jeffery, J.S., 1987. Census techniques for small populations, with special reference to the Mediterranean monk seal. 193-210. In: Symposium of the Zoological Society of London, London, 8th April–9th April 1987, Oxford: Clarendon Press.
Hiby, L., Paterson, W.D., Redman, P., Watkins, J., Twiss, S.D. et al., 2013. Analysis of photo‐id data allowing for missed matches and individuals identified from opposite sides. Methods in Ecology and Evolution, 4 (3), 252-259.
Holt, R.D., Keitt, T.H., Lewis, M.A., Maurer, B.A., Taper, M.L., 2005. Theoretical models of species’ borders: single species approaches. Oikos, 108 (1), 18-27.
IUCN/UNEP, 1998. The Mediterranean monk seal. IUCN, Gland, Switzerland, 59p. Jolly, G.M., 1965. Explicit estimates from capture-recapture data with both death and immigration - stochastic model. Biometrika, 52, 225-247.
Karamanlidis, A., Dendrinos, P., 2015. Monachus monachus. The IUCN Red List of Threatened Species 2015. 25 pp.
Karamanlidis, A., Dendrinos, P., De Larrinoa, P.F., Gücü, A. C., Johnson, W.M. et al., 2016. The Mediterranean monk seal Monachus monachus: status, biology, threats, and conservation priorities. Mammal Review, 46 (2), 92-105.
Lancia, R.A., Nichols, J.D., Pollock, K.H., 1994. Estimating the number of animals in wildlife populations. p. 215-253 In:. Research and management techniques for wildlife and habitats. Bookhout, T.A., (Eds). The Wildlife Society, Bethesda, MD.
Lavigne, D.M., Johnson, W.M., 2001. Hanging by a thread. BBC Wildlife, 19 (8), 54-60. Marchessaux, D., Muller, N., 1989. Le phoque moine, Monachus monachus: distribution, statut et biologie sur la cote saharienne. Port Cros National Park (France), Scientific Reports of the Port Cros National Park, No 13, 60 pp.
Marcou, M., 2015. The Mediterranean monk seal Monachus monachus in Cyprus. (Accessed 7 February 2019) https:// monachus-guardian.org/wordpress/2015/05/21/the-mediterranean- monk-seal-monachus-monachus-in-cyprus/
Martínez-Jauregui, M., Tavecchia, G., Cedenilla, M.A., Coulson, T., Fernández de Larrinoa, P. et al., 2012. Population resilience of the Mediterranean monk seal Monachus monachus at Cabo Blanco peninsula. Marine Ecology Progress Series 461, 273-281.
Mo, G., Güçlüsoy, H., Savaş, Y., Sigismondi, C., 2001. Pilot study on the use of infrared-sensitive video cameras for the continuous monitoring of caves used by Mediterranean monk seals, Monachus monachus. Mammalia, 65 (3), 383-386.
Mo, G., Gazo, M., Ibrahim, A., Ammar, I., Ghanem, W., 2003. Monk seal presence and habitat assessment: results of a preliminary mission carried out in Syria. The Monachus Guardian, 6 (1), 1-7.
Notarbartolo di Sciara, G., Kotomatas S., 2016. Are Mediterranean Monk Seals, Monachus monachus, Being Left to Save Themselves from Extinction? Advances in Marine Biology 75, 359-386.
Ok, M., 2006. Past, Present Status and Future of The Mediterranean Monk Seal (Monachus monachus, Hermann 1779) in The Northeastern Mediterranean. M.Sc. Thesis, METU Institute of Marine Sciences, Mersin-Turkey, 114p.
Ok, M., Sakinan, S., Gücü, A. C., 2019. A story of how a critical habitat of an endangered species is lost: the Mediterranean monk seal in the Northeastern (NE) Mediterranean, In: World Marine Mammal Conference 19, Dec 2019, Barcelona.
OSPAR, 2016. Common Indicator: Seal abundance and distribution (M3). https://www.ospar.org/documents?v=38980 (Accessed 5 April 2020).
Pastor, T., Aguilar, A., 2003. Reproductive cycle of the female Mediterranean monk seal in the Western Sahara. Marine Mammal Science, 19 (2), 318-330.
Reijnders, P.J.H., Ries, E.H., 1989. Release and radiotracking of two rehabilitated monk seals in the marine park “Northern Sporades”, Greece. A report on research conducted by the Research Institute for Nature Management. Texel. 17pp. R Core Team, 2013. R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. URL http://www.R-project.org/.
Roditi‐Elasar, M., Bundone, L., Goffman, O., Scheinin, A.P., Kerem, D.H., 2020. Mediterranean monk seal (Monachus monachus) sightings in Israel 2009–2020: Extralimital records or signs of population expansion? Marine Mammal Science, 37 (1), 344-351.
Samaranch, R., González, L.M., 2000. Changes in morphology with age in Mediterranean monk seals (Monachus monachus). Marine Mammal Science, 16 (1), 141-157.
Seber, G. A. F., 1965 A note on the multiple recapture census. Biometrika, 52(1/2), 249-259.
Scheinin, A. P., Goffman, O., Elasar, M., Perelberg, A., Kerem, D. H., 2011. Mediterranean monk seal (Monachus monachus) resighted along the Israeli coastline after more than half a century. Aquatic Mammals, 37 (3), 241.
Scoullos, M., Mantzara, M., Constantianos,V., 1994. The Book-Directory for the Mediterranean Monk Seal (Monachus monachus) in Greece. Elliniki Etairia, 1994, Greece, 167pp.
Stacey, P.B., Taper, M., 1992. Environmental variation and the persistence of small populations. Ecological Applications, 2 (1), 18-29.