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Show me your body and I tell you how hold you are: a non-invasive methodto defi...

Hartman, Karin L.; Wittich, Anja; Azevedo, José M. N.

European Cetacean Society Conference Workshop, Galway, Ireland, 25th March 2012. ; "[…]. The objective of this paper is to present a new non-intrusive and inexpensive method to classify six life history stages in Risso's dolphins: from newborn calf to old-adult. We propose an age-class indicator model using the scarification patterns and the species unique discoloration process. We developed two methods and te...


The presence of the sperm whale (Physeter macrocephalus) around the Azores: a s...

Niemeijer, Stella Charlotte; Libotte, Jennifer; Hartman, Karin L.; Steiner, Lisa; Azevedo, José M. N.

27th Annual Conference of the European Cetacean Society. Setúbal, Portugal, 8-10 April 2013. ; Aim of the study: Find out if sperm whales that are seen during summer in the Azores are migrant or resident individuals to gain a better understranding of their life history.


Data analysis model selection for estimating local population size of the Risso...

Stap, Tim Van der; Hartman, Karin L.; Wittic, Anja; Azevedo, José M. N.; Heitkönig, Ignas M. A.

27th Annual Conference of the European Cetacean Society. Setúbal, Portugal, 8-10 April 2013. ; Different models estimating cetacean population size require making assumptions about the marking and recapturing of individuals, and on the structure of the population. Crucial in selecting the most appropriate model is a critical assessment of these assumptions. In this study we applied the robust parameterization ...


Habitat differentiation between groups of Risso's dolphins as evidence of coast...

Fernandez, Marc; Hartman, Karin L.; Azevedo, José M. N.

26th Annual Conference of the European Cetacean Society, Galway, Ireland 26-28 March 2012. ; Previous studies have shown strong site fidelity by Risso's dolphins at a site off Pico Island, Azores. Females with calves tend to be seen together, often with newborn calves. In this study we analyse position and photo-identification data gathered on ocean surveys from 2004 to 2007 to look at the distribution of fema...


Behavioural responses of Risso’s dolphin, Grampus griseus, to remote biopsy sam...

Hartman, Karin L.; Wittich, Anja; Neves, Dalia; Azevedo, José M. N.

25th Conference of the European Cetacean Society. Long-terms datasets on marine mammals: learning from the past to manage the future, Cadiz, Spain, 21-23 March 2011. ; Biopsy sampling from free-ranging cetaceans is a widespread method used in various biological studies. Since this is an intrusive research technique, it’s important to determine its impact. We examined the short-term behavioural reactions of Ris...


Temporal residency patterns of Risso's dolphins, Grampus griseus, off Pico Isla...

Hartman, Karin L.; Geelhoed, Steve C. V.; Visser, Fleur; Azevedo, José M. N.

Proceedings of the 18th Biennial Conference of the Society for Marine Mammalogy, Quebec City, Canada, October 12-16, 2009. ; Temporal residency patterns of Risso's dolphins, Grampus griseus, occurring off Pico Island, Azores archipelago, were studied by conducting photoidentification surveys during 25 sampling months (May 2004-January 2007). A total of 1102 dolphins was identified, of which a restricted popula...


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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia