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Areas beyond national jurisdiction (ABNJ), or "high seas", cover around half of the planet’s surface and are home to a fragile and poorly known biodiversity. Over the past decades, threats against these areas have grown, linked to the exponential use of ABNJ and of their resources (overexploitation of fish stocks, illegal fishing, destructive fishing practices, oil and noise pollution, emerging threats linked to deep-sea mining…). Against this background, the international community felt necessary to engage the discussions on the conservation and sustainable use of marine biodiversity in ABNJ. This has been done under the auspices of the United Nations General Assembly (UNGA) and of its Ad-Hoc Open-ended Informal Working Group to study issues relating to the conservation and sustainable use of marine biological diversity beyond areas of national jurisdiction (BBNJ Working Group). Within this framework, States must decide by the end of the 69th session of the UNGA (2014) if they agree to launch the negotiations of an Implementing Agreement to the United Nations Convention on the Law of the Sea (UNCLOS).

This monograph sheds light on the status of secondary plant cover, heretofore little known, on slopes between sea level and about 750m in the Marquesas Islands, a remote tropical Polynesian archipelago of high islands of volcanic origin situated in the dry tradewind zone of the South Pacific. Plant cover types are described and assigned to xerotropical, transitional and pluviotropical floristic zones determined in part by comparison with similar zones previously devised for Oahu Island, Hawaii.