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Predictive modelling map of the most favorable observation zones for Azorean sperm whales (Physeter macrocephalus) according to depth, slope and sea surface temperature.

Authors:

Abstract

Sightings of sperm whales increase in summer due to the increasing number of trips and to the presence of family groups in the area.-75.2% of the sightings were recorded between 700 and 1300 m, according to the distribution of their main prey.-May sightings agree with the preferences of depth and slope finding for the rest of the year, but they were mostly around 17ºC, instead 20.5-23.5ºC.-Only 32.5% of the area studied is favorable to observe sperm whales in the day of may we studied, being with the better conditions only the 2.27% of the area, corresponding with areas around the islands and around the shalower oceanic waters-Study temporal and spatial distribution of sperm whales around São Miguel related with depth, slope and sea surface temperature (SST).-Prepare a predictive map of the most favorable zones to observe sperm whales in Azores Oriental for one especific day using forecast data for SST.
-Sightings of sperm whales increase in summer due to the
increasing number of trips and to the presence of family groups in the
area.
-75.2% of the sightings were recorded between 700 and 1300 m,
according to the distribution of their main prey.
-May sightings agree with the preferences of depth and slope
finding for the rest of the year, but they were mostly around 17ºC,
instead 20.5-23.5ºC.
-Only 32.5% of the area studied is favorable to observe sperm
whales in the day of may we studied, being with the better
conditions only the 2.27% of the area, corresponding with areas
around the islands and around the shalower oceanic waters
-Study temporal and spatial distribution of sperm whales around São Miguel related with
depth, slope and sea surface temperature (SST).
-Prepare a predictive map of the most favorable zones to observe sperm whales in Azores
Oriental for one especific day using forecast data for SST.
GONZÁLEZ, L. (1), TRONCOSO, J. (2)
& TORRES, J (1)
(1) Department of Applied Physics, University of Vigo, Spain.
(2) Department of Ecology and Animal Biology, University of Vigo, Spain.
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PREDICTIVE MODELLING MAP OF THE MOST FAVORABLE OBSERVATION ZONES
FOR AZOREAN SPERM WHALES (Physeter macrocephalus)
ACCORDING TO DEPTH, SLOPE AND SEA SURFACE TEMPERATURE.
INTRODUCTION
OBJECTIVES
Azores
The sperm whale (Physeter macrocephalus) has been considered
the most important species for Azorean society and economy since
the whaling times till now. Thus, the data collected firstly with the
whale hunting, and now with the whale watching is very appreciated
even its opportunistic nature.
WHALE WATCHING
(1990-now)
METHODS
BATHYMETRY
DATA (+ SLOPE)
SEA SURFACE
TEMPERATURE DATA
RESULTS
BIOLOGICAL DATA (2009-2011)
714 sightings of Pm
Biological data was collected off the south coast of
São Miguel during the commercial trips of Futurismo
Azores Whale Watching between 2009 and 2011. Boats
were guided by several lookers located on land, and
once with the animals, they registered species and
position among other records. For the predictive map,
only may data was used, and cross-tab analysis were
applying with GIS.
All the data was integrated with
Geographical InformationSystems.
Spatial distribution of sperm whale sightings DEPTH AND SLOPE
SST FORECAST FOR
ONE DAY OF MAY 2012
67.54 %
13.22 %
2.27 %
7.00 %
4.53 %
5.45 %
CONCLUSIONS
LOOKING FORWARD
χ2= 3392.78540; df = 12; P-Valor = 0.0000
Cramer's V = 0.1484
ADNOWLEDGEMENTS:
χ2= 1535.6420; df = 9; P-Valor = 0.0000
Cramer's V = 0.0998
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Frequency
days of the year
Temporal distribution of sperm whale sightings (2009-2011)
-It would be interesting to model the distribution with more variables,
finding the most important ones, and applying them in a predictive map.
-This kind of maps would be more interactive with another species, such
as the seasonal or migratory ones.
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