Historical summer distribution of the endangered North Atlantic right whale (Eubalaena glacialis) : a hypothesis based on environmental preferences of a congeneric species

• Main Authors: Monsarrat, S., Pennino, M. G., Smith, T. D., Reeves, R. R., Meynard, C. N., /Kaplan, David, Rodrigues, A. S. L.
• Format: Text
• Language: English
• Published: 2015
• Subjects: Boosted regression trees; Eubalaena; historical distribution; right whale; species distribution models; whaling; Eubalaena glacialis; Greenland; Iceland; Newfoundland; North Atlantic; North Atlantic right whale; Northern Norway; Norwegian Sea
• Online Access: https://www.documentation.ird.fr/hor/fdi:010064834

AimTo obtain a plausible hypothesis for the historical distribution of North Atlantic right whales (NARWs) (Eubalaena glacialis) in their summer feeding grounds. Previously widespread in the North Atlantic, after centuries of hunting, these whales survive as a small population off eastern North America. Because their exploitation began before formal records started, information about their historical distribution is fragmentary. LocationNorth Atlantic and North Pacific oceans. MethodsWe linked historical records of North Pacific right whales (E.japonica; from 19th-century American whaling logbooks) with oceanographic data to generate a species distribution model. Assuming that the two species have similar environmental preferences, the model was projected into the North Atlantic to predict environmental suitability for NARWs. The reliability of these predictions was assessed by comparing the model results with historical and recent records in the North Atlantic. ResultsThe model predicts suitable environmental conditions over a wide, mostly offshore band across the North Atlantic. Predictions are well supported by historical and recent records, but discrepancies in some areas indicate lower discriminative ability in coastal, shallow-depth areas, suggesting that this model mainly describes the summer offshore distribution of right whales. Main conclusionsOur results suggest that the summer range of the NARW consisted of a relatively narrow band (width c.10 degrees in latitude), extending from the eastern coast of North America to northern Norway, over the Grand Banks of Newfoundland, south of Greenland and Iceland, north of the British Isles and in the Norwegian Sea. These results highlight possibilities for additional research both on the history of exploitation and on the current summer distribution of this species. In particular, better survey coverage of historical whaling grounds could help inform conservation efforts for this endangered species. More generally, this study illustrates the challenges and ...