Tracking seabirds to identify potential Marine Protected Areas in the tropical western Indian Ocean

We conducted a regional tracking program on seabirdsin order to identify major forging hotspots and potential Marine Protected Areasin the tropical western Indian Ocean. Thirty-one species of seabirdsbreed in the region, totaling 7.4 million pairs. The main breeding grounds are in the Seychelles, in the Mozambique Channel and in the Mascarene. Seven pelagic species have been tracked so far from eight different islands of the region. Using count per sector analysiswe identified five major oceanic foraging hotspots, among which three include the breeding colonies and two are oceanic areas not connected to a breeding island. We found important overlaps between most of these seabirdforaging hotspots and potential threats (industrial fishery targeting surface dwelling tunas and marine pollutiondue to maritime routes) suggesting that in these regions seabirdsmay be at risk when foraging. Although this analysis is based on a limited number of tracking studies, the knowledge on seabirddistribution at sea has increased tremendously in the last 6 years in the tropical western Indian Ocean, and this trend will continue, as research is ongoing. The data, we present here for the first time in a single synthesis show clear spatial patterns that identify high priority locations for designation as Marine Protected Areasin the tropical western Indian Ocean.