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Новые данные о средней продолжительности жизни черноморских афалин в природе (Постер)

March 2024

DOI:10.13140/RG.2.2.35323.12322

Conference: XII Международная научно-практическая конференция «Морские исследования и образование (MARESEDU-2023)»
At: Moscow

Authors:

Irina V. Suvorova

The center of oceanography and marine biology Moskvarium, Moscow

Anastasia N. Postnikova

Marine mammal research, rescue and rehabilitation center "Serene Sea"

Anastasia V. Korosteleva

Marine mammal research, rescue and rehabilitation center "Serene Sea"

New data on the average lifespan of the Black Sea bottlenose dolphins in the wild

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February 2002

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We provide first data on the life span, growth and seasonal aspects of the life history of Black Sea bottlenose dolphins Tursiops truncatus in the wild and compare these with historical data and conspecific populations in other geographical regions. Average life span is 20 to 32 yr; the oldest record is 41 yr. The reproductive season lasts at least from February to September or October and ... [Show full abstract] includes the coldest months of the year (February and March). Average adult body lengths are 240 ± 14 cm for females and 255 ± 10 cm for males. Rapid early body growth ceases by 3–4 yr. Two morphs, one large (offshore) and one small (coastal), possibly co-exist in the Black Sea. The larger morph may include winter-breeding migrants or immigrants from the Mediterranean Sea. The small coastal form is similar in its body size and growth patterns to coastal populations in the eastern Mediterranean region and the Gulf of Mexico, but is characterized by early growth to maturity with a small asymptotic body size. Small-sized dolphin populations in enclosed water bodies can be treated as an example of the 'island rule', and their dwarfism may hypothetically be explained as an effect of smaller prey size.

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Cetacean Sightings in the Aegean Sea in Summer 2007 and 2008

March 2009

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January 1970

The exploitation of the living marine resources should take into account the effects on marine ecosystems. It consequently includes direct and indirect impacts of fishing activities on marine communities of non-market value for the fishing industry. Protecting the marine species victims of by-catch such as sea mammals is essential as it could be a serious threat for endangered species -See COM ... [Show full abstract] (1999) 363 final. The entire group of cetaceans are among the protected species listed by CITES against over-exploitation through international trade. Similarly, several international agreements on cetaceans conservation have been signed, including the Agreement on the Conservation of Small Cetaceans of the Baltic and North Seas (ASCOBANS), the ACCOBAMS agreement for the Mediterranean Sea and the Black Sea, and the Barcelona Convention for the Protection of the Marine Environment and the Coastal Region of the Mediterranean that recommends a specific conservation area in the Mediterranean Sea,.... Regarding the European Union waters, the central tenet of the EU Habitats directive 92/43/CEE on the conservation of natural habitats and of wild flora and fauna is to maintain at, or restore to, favourable conservation status, the habitats and species of environmental importance. This directive, in annex II, lists the Bottlenose Dolphin and the harbour porpoise as species that require the designation of special areas of conservation. Small cetaceans are one of the more high profile victims of accidental catches in fisheries although some fishing industry incidentally catches other mammals (seals, whales...). This chapter aims at better defining and understanding the interactions between fishing activities and the populations of sea mammals. L'exploitation des ressources marines vivantes doit tenir compte de ses conséquences pour l'écosystème marin. Cela nécessite la prise en compte des conséquences tant indirectes que directes des activités de pêche pour les éléments de l'écosystème marin qui n'ont pas de valeur commerciale pour le secteur de la pêche. Cela passe par la protection des espèces marines non commerciales comme les mammifères marins dont les captures involontaires par la pêche peuvent représenter une menace sérieuse pour les espèces en danger (COM(1999) 363 final). La Convention internationale de Washington (CITES) relative au commerce a fait figurer tout le groupe des cétacés dans les espèces protégées contre l'exploitation. Il existe divers accords internationaux relatifs à la conservation des cétacés, qui portent le nom de ASCOBANS pour la Baltique et la Mer du Nord, ACCOBAMS pour la Méditerranée et mer Noire, Convention de Barcelone qui préconise une aire spéciale de conservation en Méditerranée,.... Sur un plan strictement européen, la directive 92/43/CEE concernant la conservation des habitats naturels, de la faune et de la flore sauvages (directive " Habitats " ) vise à assurer le rétablissement ou le maintien dans un état de conservation favorable des espèces de grande importance écologique. Cette directive " Habitats " mentionne le Grand dauphin et le marsouin, dans son annexe II au titre des espèces nécessitant des mesures spéciales de conservation. Les mammifères marins les plus concernés par les captures accidentelles de la pêche européenne sont les petits cétacés bien que certaines pêcheries capturent aussi accidentellement d'autres mammifères (phoques, baleines,...). Ce chapitre a pour objectif de mieux définir et comprendre les interactions entre les activités de pêche et les populations de mammifères marins.

Last Updated: 28 Oct 2024