[MARMAM] New publication: Australian Snubfin and humpback dolphins

Guido Parra g.parra at uq.edu.au
Sun Jun 4 23:20:38 PDT 2006

Dear Marmamers, 


The following paper on Australian Snubfin and Indo-Pacific humpback dolphins
was recently published:  

Parra, G. J., Schick, R. and Corkeron, P. J. 2006. Spatial distribution and
environmental correlates of Australian snubfin and Indo-Pacific humpback
dolphins. Ecography 29:1-11





We present data on the spatial distribution of Australian snubfin and
humpback dolphins using boat-based line transect surveys in three adjacent
bays located in the Far Northern Section of the Great Barrier Reef Marine
Park, northeast Queensland. We used Geographic Information Systems (GIS),
and both randomization and Mantel tests to examine the relationship between
the spatial distribution of the dolphins and three simple, readily
quantified, environmental variables: distance to land, distance to river
mouth, and water depth. Mantel tests allowed us to make clear inferences
about the correlation of the species' distributions with environmental
variables, while taking into account spatial autocorrelation and
intercorrelation among variables. Randomization tests indicated snubfin and
humpback dolphins occur closer to land than would be expected at random.
Two-sample randomization tests indicated snubfin dolphins were found closer
to river mouths than were humpback dolphins. Taking spatial autocorrelation
into account, Mantel tests indicated all environmental variables were
correlated with the spatial distribution of snubfin and humpback dolphins.
Interspecific differences in spatial distribution appeared to be related to
proximity to river mouths. Preference by snubfin and humpback dolphins for
nearshore, estuarine waters is likely related to the productivity of these
tropical coastal areas. This spatial analysis suggests that existing
protected areas in this region may not include the most critical habitats
for snubfin and humpback dolphins. The techniques used here shown
relationships between the spatial distribution of the dolphins and
environmental features that should facilitate their management and

The paper is available through the online early issue service of Blackwell:


Those without a subscription to the journal can request a PDF copy from me:
g.parra at uq.edu.au






Guido J. Parra, PhD

Postdoctoral Fellow

School of Veterinary Science
University of Queensland
St Lucia, QLD 4072, Australia

Ph: (07) 3365-3066  Mob: 0437630843
Fax: (07) 3365-1255  Email: g.parra at uq.edu.au



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