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Citation

Thesis Title
The New Zealand common dolphin (Delphinus sp.): Identity, ecology and conservation

Read article at Massey Research Online:

Ms Stockin鈥檚 research focused on the ecology and conservation of New Zealand common dolphins (genus聽Delphinus). Both field- and laboratory-based methods were employed to examine genetic identity, stock structure, occurrence, demographics, behaviour and diet. In addition, impact assessments examined the effects of tourism and pollution on the Hauraki Gulf population. Ms Stockin鈥檚 research revealed that common dolphins exhibit high genetic variability, sharing haplotypes with both short- (D .delphis) and long-beaked species (D. capensis). Furthermore, evidence of stock structure was found for the Hauraki population. Activity budgets suggest this region to be an important feeding and calving area for the genus. Stomach content analyses revealed overlap with commercial fisheries, with arrow squid (Nototodarus聽spp.), jack mackerel (Trachurus聽spp.) and anchovy (Engraulis australis) identified as predominant prey. Further results suggest common dolphins are susceptible to human induced impacts including tourism disturbance and pollution. Ms Stockin鈥檚 research challenges previous assumptions concerningDelphinus聽and calls for the reclassification of this genus to聽Data deficient聽within New Zealand waters.

Supervisors
Professor Dianne Brunton
Dr Mark Orams
Dr Padraig Duignan
Professor Wendi Roe