II. MARCO TEORICO
2.2. Antecedentes de Investigación:
By comparing model selection between years and months, no variables were shown to be robust at predicting delphinid distribution over time. However, the full models with all years and months incorporated the same habitat preferences shown by the individual yearly and monthly models, so capturing the preferences over time within a single model.
Constricting the extent of the model resulted in two variables that showed some degree of spatial robustness: SST and thermocline depth. However, although depth had been the most significant predictor of delphinid distributions in the full extent, it was not significant at predicting delphinid distribution over a constrained extent. Overall, these results suggest that depth is a poor predictor of delphinid distributions off the west coast of Scotland. However, this result is likely to be influenced by the difficulty in separating out the depth preferences of different delphinid species. Overall, delphinids were found to be distributed fairly evenly over the deep waters of the west coast of Scotland, with lower rates of detection in shelf waters. They were found to associate with the deep (> 400 m) warm water (10.5°C-12.5°C) of the area, and in areas of deep thermocline. These results suggested that the most abundant species detected during the surveys were likely to be long-finned pilot whales and Atlantic white-sided dolphins, and that may be using the deep thermocline of the Shelf-Edge Current as a foraging ground. The areas highlighted to be of importance
to delphinids off the west coast of Scotland included the area south of the Wyville- Thompson Ridge, lying between the Scottish shelf edge and Rosemary Bank, and the shelf-edge itself. However, the models were able to explain only a small proportion of the deviance. Models that explain a higher amount of deviance may be obtained if future methods allow for the automatic identification of species from their whistles.
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