Nautical tourism affects common bottlenose dolphin (Tursiops truncatus M.) foraging success in a NATURA 2000 site, North-Eastern Adriatic Sea


Veröffentlicht: May 10, 2021
DARJA RIBARIC
https://orcid.org/0000-0002-3175-226X
JACK CLARKSON
Abstract

Several studies indicate that unregulated nautical tourism can have negative implications on cetacean behaviour. In recent years, dolphin watching activities (DWA) have increased off the West coast of Istria, Croatia, a region in which the NATURA 2000 site: ‘Akvatorij zapadne Istre’ has been proposed to be designated for bottlenose dolphins (Tursiops truncatus M.). For data collected between 2016 and 2019, we compared dolphin group behaviours from this region during impact (presence of nautical tourism boats (NTBs)) and control (absence of NTBs) scenarios, as well as providing descriptive analysis on the displacement of individuals in the presence of NTBs. Throughout the study years, 48.5 % of NTBs were observed within 15m of the dolphin focal groups and 97 % were observed within 50 m distance. The greatest rates of displacement in dolphin focal groups occurred when NTB numbers were greatest per individual dolphin. Markov chain analysis were used to quantify the short-term effects of NTB presence on dolphin behaviour. In the presence of NTBs, dolphins were more likely to spend time milling and less time foraging. Cumulative behavioural budgets, derived by accounting for the time bottlenose dolphins spent in the presence or absence of NTBs, indicated that vessel exposure levels of 14 % and 25 % were enough to statistically affect milling and foraging behaviours respectively. To lessen the lack of sustainable DWA, the implementation of relevant guidelines, e.g. Global Best Practice Guidance for Responsible Whale and Dolphin Watching (50 m no approach and 300 m caution zone) is therefore crucial to mitigate any long-term consequences the actions of NTBs may have on this key species. To date, 162 bottlenose dolphins have been photo-identified off West coast of Istria and cumulative interference to this population could affect direct ecosystem functioning.

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Autor/innen-Biografien
DARJA RIBARIC, Vivamar – Society for Marine Mammal Research and Sea Conservation, Croatia & Slovenia
Head researcher
JACK CLARKSON, Marine Mammals Research Association, Kuskavagi Mah, 543 Sok. No. 6. D, 07070 Antalya, Turkey

Research Associate and Supervisor at Marine Mammal Research Association

Literaturhinweise
Affinito, F., Olaya Meza, C., Bas, A.A., Brill, D., Whittaker, G. et al., 2018. On the behaviour of an under-studied population of bottlenose dolphins in the Southern Adriatic Sea. Journal of the Marine Biological Association of the United Kingdom, 99 (4), 1017-1023.
ACCOBAMS, 2020. Guidelines for commercial cetacean-watching in the ACCOBAMS area. www.accobams.org/documents- resolutions/guidelines/ (Accessed 12 March 2020).
Aguilar de Soto, N., Díaz, F., Carrillo, M., Brito, A., Barquín, J. et al., 2001. Evidence of disturbance of protected cetacean populations in the Canary Islands. Faculty of Biology, La Laguna University, Tenerife. https://www.researchgate.net/ publication/228838145_Evidence_of_disturbance_of_protected_ cetacean_populations_in_the_Canary_Islands (Accessed 1 March 2020).
Akkaya Bas, A., Christiansen, F., Ozturk, A.A., Ozturk, B., McIntosh, C., 2017. The effects of marine traffic on the behaviour of Black Sea harbour porpoises (Phocoena phocoena relicta) within the Istanbul Strait, Turkey. PLoS ONE, 12 (3): e0172970.
Arcangeli, A., Crosti, R., 2009. The short-term impact of dolphin- watc hing on the behaviour of bottlenose dolphins (Tursiops truncatus) in western Australia. Journal of Marine Animals and Their Ecology, 2 (1), 3-9.
Altmann, J., 1974. Observational study of behavior: sampling methods. Behaviour, 49 (3-4) 227-267.
Bearzi, G., Politi, E., Notarbartolo di Scaria, G., 1999. Diurnal behaviour of free-ranging bottlenose dolphins in the Kvarneric (Northern Adriatic Sea). Marine Mammal Science, 15 (4), 1065-1097.
Bearzi, G., Politi, E., Agazzi, S., Azzellino, A., 2005. Prey depletion caused by overfishing and the decline of marine megafauna in eastern Ionian Sea coastal waters (central Mediterranean). Biological Conservation - Journal, 127 (4), 373-382.
Bearzi, G., Fortuna, C.M., and Reeves, R.R., 2008a. Ecology and conservation of common bottlenose dolphins Tursiops truncatus in the Mediterranean Sea. Mammal Review, 39 (2), 92.
Bearzi, G., Azzellino, A., Politi, E., Costa, M., Bastianini, M., 2008b. Influence of seasonal forcing on habitat use by bottlenose dolphins Tursiops truncatus in the Northern Adriatic Sea. Ocean Science Journal, 43 (4), 175.
Bearzi, G., Fortuna, C.M. and Reeves, R.R., 2012. Tursiops truncatus (Mediterranean subpopulation). IUCN Red List of Threatened Species. Version 2016.1. www.iucnredlist. org (Accessed 12 March 2020).
Bejder, L., Dawson, S.M., Harraway, J.A., 1999. Responses by Hector’s Dolphins to Boats and Swimmers in Porpoise Bay, New Zealand. Marine Mammal Science, 15 (3), 738-750.
Borrell, A., Aguilar, A., Tornero, V., Sequeira, M., Fernandez, G. et al., 2006. Organochlorine compounds and stable isotopes indicate bottlenose dolphin subpopulation structure around the Iberian Peninsula. Environment International, 32 (4), 516-523.
Brotons, J.M., Grau, A., Rendell, L., 2008. Estimating the impact of interactions between bottlenose dolphins and artisanal fisheries around the Balearic Islands. Marine Mammal Science, 24 (1), 112-127.
Christiansen, F., Lusseau, D., Stensland, E., Berrgren, P., 2010. Effects of tourist boats on the behaviour of Indo-Pacific bottlenose dolphins off the south coast of Zanzibar. Endangered Species Research, 11 (1), 91-99.
Christiansen, F., Rasmussen, M.H., Lusseau, D., 2013a. Whale watching disrupts the feeding activities of minke whales on a feeding ground. Marine Ecology Progress Series, 478, 239-251.
Christiansen, F., Rasmussen, M.H., Lusseau, D., 2013b. Inferring activity budgets in wild animals to estimate the consequences of disturbance. Behavioral Ecology, 24, 1415-142. Christiansen, F., Rasmussen, M.H., Lusseau, D., 2014. Inferring energy expenditure from respiration rates in minke whales to measure the effects of whale watching boat interactions. Journal of Experimental Marine Biology and Ecology, 459, 96-104.
Christiansen, F., Lusseau, D., 2015. Linking behavior to vital rates to measure the effects of non-lethal disturbance on wildlife. Conservation Letters 8: 424-443.
Clark, C.W., Mangel, M., 1986. The evolutionary advantages of group foraging. Theoretical Population Biology, 30, 45-75.
Clarkson, J., Christiansen, F., Awbery, T., Abbiss, L., Nikpaljevic, N. et al., 2020. Non-targeted tourism affects the behavioural budgets of bottlenose dolphins Tursiops truncatus in the South Adriatic (Montenegro). Marine Ecology Progress Series, 638, 165-176.
Constantine, R., Brunton, D.H., Dennis, T., 2004. Dolphin watching tour boats change bottlenose dolphin (Tursiops truncatus) behaviour. Biological Conservation, 117, 299-230.
Coomber, F.G., D’Incà, M., Rosso, M., Tepsich, P., Notarbartolo di Sciara, G. et al., 2016. Description of the vessel traffic within the north Pelagos Sanctuary: inputs for Marine Spatial Planning and management implications within an existing international Marine Protected Area. Marine Policy, 69, 102-113.
Državni zavod za zaštitu prirode, 2015 and 2020. NATURA 2000 standard data form. www.natura2000.dzzp.hr/reportpublish/ reportproxy.aspx?paramSITECODE=HR5000032 (Accessed 10 Mar 2020)
Emlen, S.T., 1991. Evolution of cooperative breeding in birds and mammals. p. 301-337. In: Behavioural Ecology: An Evolutionary Approach. Krebs, J.R., Davies, N.B. (Eds.). Blackwell Scientific Publications, UK. EU, 2020. European Environment Agency. The Natura 2000 protected areas network. www.eea.europa.eu/themes/biodiversity/ natura-2000 (Accessed 10 Mar 2020)
Fortuna, C.M., 2006. Ecology and conservation of bottlenose dolphins (Tursiops truncatus) in the north-eastern Adriatic Sea. PhD thesis, University of St. Andrews, UK, 256 pp.
Fossi, M.C., Marsili, L., 2003. Effects of endocrine disruptors in aquatic mammals. Journal of Macromolecular Science, Part A, Pure and Applied Chemistry, 75, 2235-224.
Gnone, G., Bellingeri, M., Dhermain, F., Dupraz, F., Nuti, S. et al., 2011. Distribution, abundance, and movements of the bottlenose dolphin (Tursiops truncatus) in the Pelagos Sanctuary MPA (north‐west Mediterranean Sea). Aquatic Conservation: Marine and Freshwater Ecosystems, 21, 372-388.
Government of the Republic Croatia, 2013. Proposal for tourism development strategy of the Republic of Croatia until 2020 www.mint.gov.hr/UserDocsImages/arhiva/Tourism_ development_strategy_2020.pdf (Accessed 2 Mar 2020)
Gomerčić, T., Đuras Gomerčić, M., Gomerčić, H., 2008. Znanstvena analiza tri područja (HR5000032, HR3000419, HR3000426) važnih za vrstu dobri dupin (Tursiops truncatus) izrađena za potrebe izrade prijedloga potencijalnih NATURA 2000 područja, Udruga za zaštitu prirode “Val”, Zagreb. http://natura2000.dzzp.hr/reportpublish/reportproxy.aspx?paramSITECODE= HR5000032 (Accessed 2 Mar 2020)
Gonzalvo, J., Forcada, J., Grau, E., Aguilar, A., 2014. Strong site-fidelity increases vulnerability of common bottlenose dolphins Tursiops truncatus in a mass tourism destination in the western Mediterranean Sea. Journal of the Marine Biological Association of the United Kingdom, 94 (6), 1227-1235.
Gračan, D., Gregorić, M., Martinić, T., 2016. Nautical tourism in Croatia: current situation and outlook. p. 66-79. In: Tourism & Hospitality Industry 2016. Congress Proceedings.
Heithaus, M.R., Dill, L.M., 2002. Food availability and tiger shark predation risk influences bottlenose dolphin habitat use. Ecology, 83, 480-491.
Ilič, J.A., 2018. The correlation between chlorophyll-a concentration and bottlenose dolphin (Tursiops truncatus) distribution in the North Adriatic Sea. Proc Keystone and Wildlife Research, Viva Presentation. Nottingham Trent University, UK. IUCN-MMPATF, 2017. Northern Adriatic IMMA Factsheet. IUCN Joint SSC/WCPA Marine Mammal Protected Areas Task Force. https://www.iucn.org/commissions/world-commission- protected-areas/our-work/marine-mammal-protected- areas (Accessed 2 March 2020) JNCC, 2016. Resource Hub. https://hub.jncc.gov.uk/ (Accessed 2 March 2020)
Lewis, S., Walker, D., 2018. Global Best Practice Guidance for Responsible Whale and Dolphin Watching: Tourism activities involving wild cetaceans. A guide by the World Cetacean Alliance with support from Club Med. Brighton, UK.
Lusseau, D., 2003. Effects of tour boats on the behaviour of bottlenose dolphins: using Markov chains to model anthropogenic impacts. Conservation Biology, 17 (6), 1785-1793.
Lusseau, D., 2004. The hidden cost of tourism: detecting longterm effects of tourism using behavioural information. Ecology and Society, 9 (1) 2.
Lusseau, D., Higham, J.E.S., 2004. Managing the impacts of dolphin- based tourism through the definition of critical habitats: the case of bottlenose dolphins (Tursiops spp.) in Doubtful Sound, New Zealand. Tour Management, 25, 657-667.
Lusseau, D., 2006. Why do dolphins jump? Interpreting the behavioural repertoire of bottlenose dolphins (Tursiops sp.) in Doubtful Sound, New Zealand. Behavioural Processes, 73, 257-265.
Lusseau, D., Slooten, L., Currey, R.J., 2006. Unsustainable dolphin- watching tourism in Fiordland, New Zealand”. Tourism in Marine Environments, 3 (2), 173-178.
Marley, S.A., Kent, C.P.S., Erbe, C., Parnum, I.M., 2017. Effects of vessel traffic and underwater noise on the movement, behaviour and vocalisations of bottlenose dolphins in an urbanised estuary. Scientific Reports - Nature, 7, 13437.
Meissner, A.M., Christiansen, F., Martinez, E., Pawley, M.D.M., Orams, M.B. et al., 2015. Behavioural Effects of Tourism on Oceanic Common Dolphins, Delphinus sp., in New Zealand: The Effects of Markov Analysis Variations and Current Tour Operator Compliance with Regulations. PLoS ONE 10 (1): e0116962. (Accessed 3 March 2020)
Nabe-Nielsen, J., Sibly, R.M., Tougaard, J., Teilmann, J., Sveegaard, S., 2014. Effects of noise and by-catch on a Danish harbour porpoise population. Ecological Modelling, 272, 242-251.
NATURA, 2000. Network viewer. http://natura2000.eea.europa. eu (Accessed 3 Mar 2020)
New, L.F., Clark, J.S., Costa, D.P., Fleisham, E., Hindell, M.A. et al., 2014. Using short-term measures of behaviour to estimate long-term fitness of southern elephant seals. Marine Ecology Progress Series, 496, 99-108.
Pirotta, E., Merchant, N.D., Thompson, P.M., Barton, T.R., Lusseau, D., 2015. Quantifying the effect of boat disturbance on bottlenose dolphin foraging. Activity. Biological Conservation, 181, 82-89. RAC/SPA, 2004. Guidelines for Commercial Cetacean-Watching Activities in the Black Sea, the Mediterranean Sea and Contiguous Atlantic Area. https://www.rac-spa.org/sites/default/files/ doc_cetacean/watching.pdf (Accessed 3 Mar 2020)
Rako, N., Fortuna, C.M., Holcer, D., Mackelworth, P., Nimak- Wood, M. et al., 2013. Leisure boating noise as a trigger for the displacement of the bottlenose dolphins of the Cres–Lošinj archipelago (northern Adriatic Sea, Croatia). Marine pollution bulletin, 68 (1-2), 77-84.
Ribarič, D., Herlec T., 2008. A first report about Botllenose Dolphins (Tursiops truncatus) off the tip of Istria, Croatia. In: Proceedings 22nd Conference of the European Cetacean Society, Egmond aan Zee, Netherlands.
Ribarič, D., 2013. Bottlenose Dolphins (Tursiops truncatus) off Rovinj archipelago (Istria, Croatia). A mosaic stone to a picture in north-east Adriatic. p. 245. In: Proceedings 27th Conference of the European Cetacean Society, Setubal, Portugal.
Ribarič, D., 2017. First report on abundance and distribution of common bottlenose dolphins (Tursiops truncatus) in the NATURA 2000 area, Istria, North-Eastern Adriatic Sea. Journal of the Marine Biological Association of the United Kingdom, 98 (5), 1039-1053.
Rolland, R.M., Schick, R.S., Pettis, H.M., Knowlton, A.R., Hamilton, P.K. et al., 2016. Health of North Atlantic right whales Eubalaena glacialis over three decades: From individual health to demographic and population health trends. Marine Ecology Progress Series, 542, 265-28.
Severini N., 2013. Management and overfishing problems in the High Adriatic sea and the future policy perspectives. pp.8. In: 2nd AIEAA Conference, Parma, Italy, 6-7 June 2013. http://ageconsearch.umn.edu/bitstream/149930/2/127_Severini. pdf (Accessed 5 June 2020)
Shane, S.H., Wells, R.S., Würsig, B., 1986. Ecology, behaviour, and social organisation of the bottlenose dolphin: a review. Marine Mammal Science, 2, 34-63.
Shane, S.H., 1990. Behavior and ecology of the bottlenose dolphin at Sanibel Island, Florida. pp. 245-265. In: The Bottlenose Dolphin. S. Leatherwood and R.R. Reeves (Eds.). Academic Press, San Diego, CA.
Stanton, M.A., Mann, J., 2012. Early social networks predict survival in wild bottlenose dolphins. PLOS ONE 7: e4750. (Accessed 3 March 2020).
Steckenreuter, A., Harcourt, R., Moller, L., 2011. Distance does matter: Close approaches by boats impede feeding and resting behaviour of Indo-Pacific bottlenose dolphins. Wildlife Research, 38, 455-463.
Stensland, E., Berggren, P., 2007. Behavioural changes in female Indo-Pacific bottlenose dolphins in response to boat-based tourism. Marine Ecology Progress Series, 332, 225-234.
Štrbenac, A., 2015. Strategy on the conservation of cetaceans in the Adriatic Sea for the period 2016-2025. Document produced under the NETCET project, IPA Adriatic Cross-border Cooperation Programme. www.netcet. eu/ files/ Booklets/ NETCET _ WP7 _ Common _ strategy _ for _ cetaceans _ conservation _ booklet.pdf (Accessed 5 June 2020).
Triossi, F., Willis, T.J., Pace, D.S., 2013. Occurrence of bottlenose dolphins Tursiops truncatus in natural gas fields of the northwestern Adriatic Sea. Marine Ecology, 34, 373-379.
UNEP-MAP-RAC/SPA., 2014. Status and Conservation of Cetaceans in the Adriatic Sea. By Holcer D, Fortuna CM & Mackelworth PC. Draft internal report for the purposes of the Mediterranean Regional Workshop to Facilitate the Description of Ecologically or Biologically Significant Marine Areas, Malaga, Spain.
Williams, R., Lusseau, D., Hammond, P.S., 2006. Estimating relative energetic costs of human disturbance to killer whales (Orcinus orca). Biological Conservation, 133, 301-331.
Wisniewska, D.M., Johnson, M., Teilmann, J., Rojano-Donate, L., Shearer, J. et al., 2016. Ultra-high foraging rates of harbor porpoises make them vulnerable to anthropogenic disturbance. Current Biology, 26, 1-6.
Yazdi, P., 2005. Einfluss der Tourismusboote auf das Verhalten und die Energetik der Großen Tümmler (Tursiops truncatus) vor der Insel Choros, Chile. PhD dissertation, University of Kiel, Germany, 197 pp.