Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts
The study of demographic parameters and social structure of vulnerable marine mammal populations is critical to assess their ecology and take conservation measures. In Tunisia, Data of bottlenose dolphin (Tursiops truncatus, Montagu 1821) social structure is lacking. This study describes group organization and social affiliation of these species. Surveys were assessed from 2017 to 2018 in the Tunisian North-eastern coasts. A total of 221.5 survey hours resulted from 79 surveys which only 35 surveys are on contact with 45 identified dolphins. Bottlenose dolphins were observed in all seasons. Seasonality was evident, with more encounters during the summer and fall. Groups encountered can include adults and immatures. Group size depend on group composition: groups with immature dolphins and groups formed only by adults were significantly different (Kruskal–Wallis test, p < 0.001). Encountered individuals are living in a fission-fusion society in which companionships are frequently change temporal analyses justify this observation with “casual acquaintance” as the best-fit model. The variability of social affiliations seems to be related to changes in groups composition and especially to the presence of immatures. Similarly, these affiliations seem to be dependent on the availability of prey or the presence of purse seiners in the bottlenose dolphin distribution area.
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| Format: | Journal Contribution biblioteca |
| Language: | English |
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2020
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| Subjects: | Tursiops truncatus, taille des groupes, structure sociale, marine mammal, |
| Online Access: | http://hdl.handle.net/1834/41598 |
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dig-aquadocs-1834-415982021-10-29T02:10:16Z Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts Démographie et structure sociale d’une population résidente de Grand Dauphin Tursiops truncatus (Montagu, 1821) des côtes Nord-Est de la Tunisie Ben Messaoud, Rimel Cherif, Mourad Koched, Wael Zaara, K. Ben Moumene, Y. Tursiops truncatus taille des groupes structure sociale marine mammal The study of demographic parameters and social structure of vulnerable marine mammal populations is critical to assess their ecology and take conservation measures. In Tunisia, Data of bottlenose dolphin (Tursiops truncatus, Montagu 1821) social structure is lacking. This study describes group organization and social affiliation of these species. Surveys were assessed from 2017 to 2018 in the Tunisian North-eastern coasts. A total of 221.5 survey hours resulted from 79 surveys which only 35 surveys are on contact with 45 identified dolphins. Bottlenose dolphins were observed in all seasons. Seasonality was evident, with more encounters during the summer and fall. Groups encountered can include adults and immatures. Group size depend on group composition: groups with immature dolphins and groups formed only by adults were significantly different (Kruskal–Wallis test, p < 0.001). Encountered individuals are living in a fission-fusion society in which companionships are frequently change temporal analyses justify this observation with “casual acquaintance” as the best-fit model. The variability of social affiliations seems to be related to changes in groups composition and especially to the presence of immatures. Similarly, these affiliations seem to be dependent on the availability of prey or the presence of purse seiners in the bottlenose dolphin distribution area. L'étude des paramètres démographiques et de la structure sociale des populations vulnérables de mammifères marins est essentielle pour pouvoir dégager des mesures de conservation. En Tunisie, les données sur la structure sociale du Grand Dauphin (Tursiops truncatus, Montagu 1821) font défaut. Cette présente étude décrit l'organisation et la socialite des groupes de Grand Dauphin résidents des côtes Nord-Est de la Tunisie. Des observations en mer ont été menées durant l’année 2017 - 2018. Au total 79 sorties ont été realisées avec un effort d’observation égale à 221,5 heures. Seules 38 sorties ont été sujettes d’observation directe avec 45 groupes de Grand Dauphin. Cette espèce a été observée à longueur d’année. La saisonnalité était évidente, avec plus de rencontres durant les saisons estivales et automnales. Les groupes rencontrés peuvent inclure des adultes et des immatures ce qui influençaient la taille des groupes. La taille des groupes incluant immatures et adultes se différenciait des groupes formés uniquement par des adultes (test de Kruskal – Wallis, p <0,001). Les individus rencontrés suivaient une structure sociale de type fission-fusion avec changement fréquent des compagnons. Les analyses temporelles justifient cette observation avec la «connaissance occasionnelle» comme modèle le mieux adapté.La variabilité des affiliations sociales semble être liée à des changements dans la composition des groupes et surtout à la présence d'immatures. De même, ces affiliations semblaient dépendre de la disponibilité de proies ou de la présence de senneurs dans l'aire de répartition de l’espèce étudiée. Published Refereed 2021-10-28T10:28:34Z 2021-10-28T10:28:34Z 2020 Journal Contribution Refereed http://hdl.handle.net/1834/41598 en 75-85 Nord-Est de la Tunisie |
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Tursiops truncatus taille des groupes structure sociale marine mammal Tursiops truncatus taille des groupes structure sociale marine mammal |
| spellingShingle |
Tursiops truncatus taille des groupes structure sociale marine mammal Tursiops truncatus taille des groupes structure sociale marine mammal Ben Messaoud, Rimel Cherif, Mourad Koched, Wael Zaara, K. Ben Moumene, Y. Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| description |
The study of demographic parameters and social structure of vulnerable marine mammal populations is critical to assess their ecology and take conservation measures. In Tunisia, Data of bottlenose dolphin (Tursiops truncatus, Montagu 1821) social structure is lacking. This study describes group organization and social affiliation of these species. Surveys were assessed from 2017 to 2018 in the Tunisian North-eastern coasts. A total of 221.5 survey hours resulted from 79 surveys which only 35 surveys are on contact with 45 identified dolphins. Bottlenose dolphins were observed in all seasons. Seasonality was evident, with more encounters during the summer and fall. Groups encountered can include adults and immatures. Group size depend on group composition: groups with immature dolphins and groups formed only by adults were significantly different (Kruskal–Wallis test, p < 0.001). Encountered individuals are living in a fission-fusion society in which companionships are frequently change temporal analyses justify this observation with “casual acquaintance” as the best-fit model. The variability of social affiliations seems to be related to changes in groups composition and especially to the presence of immatures. Similarly, these affiliations seem to be dependent on the availability of prey or the presence of purse seiners in the bottlenose dolphin distribution area. |
| format |
Journal Contribution |
| topic_facet |
Tursiops truncatus taille des groupes structure sociale marine mammal |
| author |
Ben Messaoud, Rimel Cherif, Mourad Koched, Wael Zaara, K. Ben Moumene, Y. |
| author_facet |
Ben Messaoud, Rimel Cherif, Mourad Koched, Wael Zaara, K. Ben Moumene, Y. |
| author_sort |
Ben Messaoud, Rimel |
| title |
Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| title_short |
Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| title_full |
Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| title_fullStr |
Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| title_full_unstemmed |
Demography and social structure of resident population of bottlenose dolphin Tursiops truncatus (Montagu, 1821) in Tunisian North-eastern coasts |
| title_sort |
demography and social structure of resident population of bottlenose dolphin tursiops truncatus (montagu, 1821) in tunisian north-eastern coasts |
| publishDate |
2020 |
| url |
http://hdl.handle.net/1834/41598 |
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