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• W302508501 abstract "Irrawaddy dolphins, Orcaella brevirostris, and Indo-Pacific humpbackdolphins (hereafter humpback dolphins), Sousa chinensis, are two of the least knownspecies of coastal dolphins found in the Indian and West Pacific Ocean region. Bothspecies occur in sympatry throughout most of their range in Australian waters, wherethey have been little studied. As a result, the conservation status of Australianpopulations of Irrawaddy and humpback dolphins is unknown and conservation andmanagement actions have been hampered by this lack of knowledge.To overcome this lack of knowledge and improve the capacity to effectivelyconserve and manage Australian populations of Irrawaddy and humpback dolphins,this study aimed to contribute information on different aspects of their behaviouralecology. As both species co-occur throughout most of their range in Australianwaters, an additional aim of this study was to analyse the degree of ecologicalseparation between them. This comparative approach served two purposes: 1) toprovide species-specific information on different aspects of the behavioural ecology(e.g., habitat use, social structure) of these species, and 2) to provide insights into themechanisms promoting their coexistence.Boat-based surveys were carried out in different areas along the east coast ofQueensland between 1999-2002, focusing mainly in one area, Cleveland Bay DugongProtected Area (hereafter referred as Cleveland Bay), where populations of bothspecies are known to co-occur and where weather and logistical considerationsallowed for almost year-round boat-based observations.Analysis of data on the spatial distribution of Irrawaddy and humpbackdolphin schools along different areas along the east coast of Queensland indicated thatthe distribution of Irrawaddy and humpback dolphins was strongly influenced byproximity to the coast, with both species occurring closer to land than would beexpected under a random scenario. When comparing between species, Irrawaddydolphins occurred closer to river mouths than humpback dolphins, but thisinterspecific difference was not constant across study areas. Based on the spatialdistribution of both species in the areas surveyed, I found that the existing protectedareas may not include the most critical habitats for Irrawaddy and humpback dolphins.In Cleveland Bay, I found that Irrawaddy and humpback dolphins werepresent year round between 1999 and 2002. There was no evidence of variation intheir occurrence with year or season. Irrawaddy and humpback dolphins used coastal waters of Cleveland Bay mainly for foraging activities indicating this area representsan important feeding area within their home range.I also found that Irrawaddy and humpback dolphins exhibit significantlydifferent school dynamics, with Irrawaddy dolphins forming larger schools (mean ±SE = 5.3 ± 0.35) than humpback dolphins (mean ± SE = 3.5 ± 0.19). School of bothspecies were mainly composed of adult individuals and, in proportion to the totalnumber of animals within a school, Irrawaddy…" @default.
• W302508501 created "2016-06-24" @default.
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• W302508501 date "2005-01-01" @default.
• W302508501 modified "2023-09-27" @default.
• W302508501 title "Behavioural ecology of Irrawaddy, Orcaella brevirostris (Owen in Gray, 1866), and Indo-Pacific humpback dolphins, Sousa chinensis (Osbeck, 1765), in northeast Queensland, Australia : a comparative study" @default.
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