Association patterns of bottlenose dolphins (Tursiops aduncus) off Point Lookout, Queensland, Australia

2002 ◽  
Vol 80 (6) ◽  
pp. 973-979 ◽  
Author(s):  
B Louise Chilvers ◽  
Peter J Corkeron
Keyword(s):  
Selection Criteria ◽  
Bottlenose Dolphins ◽  
Community Size ◽  
Association Patterns ◽  
Entire Study ◽  
Tursiops Aduncus ◽  
Association Pattern ◽  
Time Period ◽  
The Social ◽  
Animal Communities

The social structure of animal communities is usually measured through interactions or associations of individuals within the community. However, investigating and identifying association patterns for large communities of social animals can be difficult, given the logistical difficulties of identifying a large number of individuals within a given area and time period. In this study, over 550 individuals were identified within a large community of bottlenose dolphins (Tursiops aduncus) sampled intensively during the winters of 1998 and 1999 off Point Lookout, Queensland, Australia. Association patterns within this community were analysed using the half-weight index of association, including seven criteria for selecting individuals for inclusion in the analysis. Selection criteria were based on the number of times an individual was sighted during the entire study period. Overall, the community showed a highly fluid association pattern, with only two selection criteria showing association patterns that differed significantly from random. This type of association pattern is commonly reported for large communities of cetaceans. However, without the inclusion of other population information such as estimates of the proportion of identifiable individuals in the community and of community size, it appears that association patterns for these large communities may not be accurately assessed.

Association patterns and kinship in female Indo-Pacific bottlenose dolphins (Tursiops aduncus) of southeastern Australia

2006 ◽  
Vol 61 (1) ◽  
pp. 109-117 ◽  
Author(s):  
Luciana M. Möller ◽  
Luciano B. Beheregaray ◽  
Simon J. Allen ◽  
Robert G. Harcourt
Keyword(s):  
Bottlenose Dolphins ◽  
Association Patterns ◽  
Tursiops Aduncus ◽  
Southeastern Australia

Resighting and association patterns of bottlenose dolphins (Tursiops truncatus) in the Cedar Keys, Florida: insights into social organization

2001 ◽  
Vol 79 (3) ◽  
pp. 447-456 ◽  
Author(s):  
Ester Quintana-Rizzo ◽  
Randall S Wells
Keyword(s):  
Social Organization ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Aquatic Systems ◽  
Estuarine System ◽  
Association Patterns ◽  
Selective Pressures ◽  
The Social ◽  
Estuarine Systems ◽  
Common Dolphins

Little is known about the social organization of bottlenose dolphins (Tursiops truncatus) inhabiting open estuarine systems. Our purpose was to identify and quantify the resightings of bottlenose dolphins and associations formed among them to provide insights into the social organization of the species in the open estuarine system of the Cedar Keys, Florida. We conducted monthly photographic-identification surveys from June 1996 through May 1997. We identified a total of 233 dolphins of which 217 (93%) were classified into one of four categories based on the number of months in which they were sighted. "Rare" dolphins (sighted during 1–2 months) constituted more than half of these individuals (61%), followed by "occasional" (3–5 months; 20%), "common" (>8 months; 12%), and "frequent" (5–6 months; 7%) dolphins. We quantified the associations for dolphins sighted 10 times (26 common, 12 frequent, and 8 occasional) and found that individuals with different resighting patterns associate with each other but the association is mostly at a low level. The level of association among common dolphins, however, was higher within than between the sexes. Association patterns of common dolphins in the Cedar Keys resemble the associations of resident bottlenose dolphins inhabiting closed estuarine bays, suggesting that the selective pressures which induce such associations are the same in these aquatic systems.

scholarly journals Estimates of abundance and change in abundance of the Indo-Pacific bottlenose dolphins (Tursiops aduncus) along the south coast of South Africa

2019 ◽  
Author(s):  
OA Vargas-Fonseca ◽  
SP Kirkman ◽  
WC Oosthuizen ◽  
T Bouveroux ◽  
V Cockcroft ◽  
...  
Keyword(s):  
South Africa ◽  
Conservation Status ◽  
Bottlenose Dolphins ◽  
South Coast ◽  
The South ◽  
Model Estimate ◽  
Entire Study ◽  
Tursiops Aduncus ◽  
Photo Identification ◽  
Open Population

AbstractWe investigated the abundance of Indo-Pacific bottlenose dolphins (Tursiops aduncus) along the south coast of South Africa, from the Goukamma Marine Protected Area (MPA) to the Tsitsikamma MPA, between 2014 and 2016. During this period, 662.3h of boat-based photo-identification survey effort was carried out, and the sighting histories of 817 identified individuals were used to estimate abundance using mark-recapture modelling. The selected open population model (POPAN) provided an estimate of 2,295 individuals (95% CI: 1,157-4,553) for the entire study area. A model estimate was produced for a subset of the study area, Plettenberg Bay, which could be compared with a past estimate for this location (2002-2003). The comparison suggested a 72.3% decrease in abundance, from 6,997 (95% CI: 5,230-9,492) in 2002-2003 to 1,940 (95% CI: 1,448-2,600) in 2014-2016. The decline in abundance was supported by a 72% reduction in mean group size for Plettenberg Bay between the periods. It is essential to be able to assess abundance changes at other locations to inform revision of T. aduncus conservation status in South Africa.

Social and Behavioural Characteristics of Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) in northern New South Wales, Australia.

2008 ◽  
Vol 30 (2) ◽  
pp. 71 ◽  
Author(s):  
E. R. Hawkins ◽  
D. F. Gartside
Keyword(s):  
Human Impacts ◽  
New South ◽  
Bottlenose Dolphins ◽  
New South Wales ◽  
Movement Patterns ◽  
Base Line ◽  
Tursiops Aduncus ◽  
South Wales ◽  
The Social ◽  
The Mean

Bottlenose dolphins (Tursiops spp.) are one of the most common genera of cetacea encountered throughout the world?s tropical and temperate regions. However, there is relatively little knowledge on the populations of bottlenose dolphins in Australia. The present study assessed the pod characteristics, behaviour, movement patterns and social structure of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in coastal inshore waters off northern New South Wales, Australia, using vessel-based and land-based surveys. Dolphins spent most time travelling (38%), followed by milling (31%), feeding (19%), and socialising (12%). The mean pod size of dolphins in Byron Bay was 13 (S.D. = 12). The social foundation of this population was characterised by sexual segregation. Significant variations were found between the mean size of mother-calf pods (21; S.D. = 15) and adult-only pods (5; S.D. = 5). Two ?resident? groups of females were identified that occupied adjacent territories of between 177 km� and 320 km�. ?Resident? females appeared to maintain loose associations with other ?resident? females (HWI = 0.28; S.D. = 0.66). Despite the large differences in environmental conditions, habitats and prey species, it appeared that the social organisation, movement patterns and behaviour of T. aduncus populations in coastal regions is similar. The Byron Bay population of dolphins is not presently heavily impacted by interactions with humans, compared to populations with regular commercial dolphin-watching operations. This means the population may provide important base-line data for assessment of potential human impacts on dolphin populations.

Identification of a resident community of bottlenose dolphins (Tursiops aduncus) in the Swan Canning Riverpark, Western Australia, using behavioural information.

2012 ◽  
Vol 18 (4) ◽  
pp. 247 ◽  
Author(s):  
Delphine Chabanne ◽  
Hugh Finn ◽  
Chandra Salgado-Kent ◽  
Lars Bedjer
Keyword(s):  
Western Australia ◽  
Permutation Test ◽  
Bottlenose Dolphins ◽  
Management Unit ◽  
Adult Males ◽  
Community Size ◽  
Association Analyses ◽  
Tursiops Aduncus ◽  
Best Fitting ◽  
Simple Ratio

Identifying appropriate management units is vital for wildlife management. Here we investigate one potential management unit — resident communities of bottlenose dolphins — using information from ranging, occupancy, and association patterns. We identify a resident community of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in the Swan Canning Riverpark, Western Australia based on: ranging patterns, sighting rates, Lagged Identification Rates (LIR), and three measures of social affinity and structure (Simple Ratio Index, preferred dyadic association analyses, and Lagged Association Rates (LAR)). The analyses yielded an estimated ‘community size’ of 17–18 individuals (excluding calves). High seasonal sighting rates (> 0.75 sightings per season) and a long mean residence time (ca. nine years) indicated year-round residency. The model best-fitting the LIR (emigration and mortality) also supported this. The social structure of dolphins was species-typical, characterized by significant dyadic associations within agesex classes (permutation test; P < 0.001), stronger associations among adult males than among adult females (LAR males > LAR females), and temporally stable associations (LAR > null LAR). Constant companions or long-lasting association models best explained adult male and female LARs. While behavioural information identified a resident community in the Riverpark, genetic and demographic information is needed to assess its appropriateness as a management unit.

Reduced Detection of Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) in an Inner Harbour Channel During Pile Driving Activities

2015 ◽  
Vol 41 (4) ◽  
pp. 455-468 ◽  
Author(s):  
Estênio G. Paiva ◽  
Chandra P. Salgado Kent ◽  
Marthe Monique Gagnon ◽  
Robert McCauley ◽  
Hugh Finn
Keyword(s):  
Bottlenose Dolphins ◽  
Pile Driving ◽  
Tursiops Aduncus

The Ideology of Socialism and the Armenian Political Parties

wisdom ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 107-113
Author(s):  
Gegham HOVHANNISYAN
Keyword(s):  
Political Parties ◽  
Political Life ◽  
The Political ◽  
Political Organizations ◽  
Social Democrats ◽  
Time Period ◽  
The Social ◽  
Political Forces ◽  
The 19Th Century ◽  
The Given

The article covers the manifestations and peculiarities of the ideology of socialism in the social-political life of Armenia at the end of the 19th century and the beginning of the 20th century. General characteristics, aims and directions of activity of the political organizations functioning in the Armenian reality within the given time-period, whose program documents feature the ideology of socialism to one degree or another, are given (Hunchakian Party, Dashnaktsutyun, Armenian Social-democrats, Specifics, Socialists-revolutionaries). The specific peculiarities of the national-political life of Armenia in the given time-period and their impact on the ideology of political forces are introduced.

Whistle Characteristics of Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) in the Fremantle Inner Harbour, Western Australia

2016 ◽  
Vol 44 (1) ◽  
pp. 159-169 ◽  
Author(s):  
Rhianne Ward ◽  
Iain Parnum ◽  
Christine Erbe ◽  
Chandra Salgado-Kent
Keyword(s):  
Western Australia ◽  
Bottlenose Dolphins ◽  
Tursiops Aduncus
Sign in / Sign up

Export Citation Format

Share Document