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Throughout the Marquesas Islands of French Polynesia, forest spirits share space with ancestral ruins and active agricultural plots, affecting land use and heritage preservation. As Marquesans continue their efforts to establish UNESCO World Heritage status, they grapple with questions about when sites should be preserved intact, when neglect is an appropriate option, and when deterioration resulting from local livelihoods should be accepted.In Working with the Ancestors Emily Donaldson considers how Marquesan perceptions of heritage and mana, or sacred power, have influenced the use of land in the islands and how both cultural and environmental sustainability can be achieved. The Marquesas’ relative geographical isolation and ecological richness are the backdrop for the confluence of international heritage preservation and sustainability efforts that affect both resources and Indigenous peoples. Donaldson demonstrates how anthropological concepts of embodiment, alienation, place, and power can inform global resource management, offering a new approach that integrates analyses of policy, practice, and heritage.

Hawaiian Melicope are one of the major adaptive radiations of the Hawaiian Islands comprising 54 endemic species. The lineage is monophyletic with an estimated crown age predating the rise of the current high islands. Phylogenetic inference based on Sanger sequencing has not been sufficient to resolve species or deeper level relationships. Here, we apply restriction site-associated DNA sequencing (RAD-seq) to the lineage to infer phylogenetic relationships. We employ Quartet Sampling to assess information content and statistical support, and to quantify discordance as well as partitioned ABBA-BABA tests to uncover evidence of introgression. Our new results drastically improved resolution of relationships within Hawaiian Melicope . The lineage is divided into five fully supported main clades, two of which correspond to morphologically circumscribed infrageneric groups. We provide evidence for both ancestral and current hybridization events. We confirm the necessity for a taxonomic revision of the Melicope section Pelea , as well as a re-evaluation of several species complexes by combining genomic and morphological data.

Mutualistic relationships such as the one between Trapezia crabs and coral colonies are common in reef organisms and play a crucial role in coral resilience and resistance to climate‐induced stressor, yet very little is known about the taxonomic diversity and evolutionary history of the species involved. Despite being essential actors of coral reefs and threatened by the ongoing degradation of their habitat, little genetic information is available for Trapezia crabs, including the exact number of species and their relationships. To overcome this limitation, we sampled Natural History Collections, an important and underutilized source of genomic data. We used a novel approach optimized for degraded DNA to generate high‐quality genomic data from a combination of 166 museum tissues and freshly collected samples and recovered a strongly supported phylogeny of the Trapezia genus, clarifying species relationships of a majority of taxa and suggesting the potential division of Trapezia into two genera. We then focused on the most widespread species T. bidentata and identified four distinct genetic clusters, suggesting high divergence and cryptic speciation in the Indian Ocean and the Marquesas Islands. Populations of the Central and West Pacific showed signs of admixture across a heterogeneous seascape, attributing to a potentially long pelagic dispersal phase and expansive gene pool. Our results highlight the need to further explore the genetic diversity within other Trapezia species and other coral‐associated organisms, as they are likely to exhibit more complex genetic patterns than previously understood. We explored the evolutionary history of Trapezia crabs, key coral mutualists, using genomic data from museum and freshly collected samples. We recovered a well‐supported phylogeny of the Trapezia genus, clarifying species relationships and supporting the division of Trapezia into two genera. Detailed analyses of the widespread species T. bidentata identified four distinct genetic clusters and two cryptic species in the Indian Ocean and the Marquesas Islands, while populations in the Central and West Pacific showed signs of admixture, indicating extensive gene flow. These findings underscore the need for further investigation into the genetic diversity of Trapezia and other coral‐associated species, as they likely exhibit more complex patterns than previously known.

In Central-East Polynesia (CEP), development of warfare remains poorly documented except for the fortified villages of Rapa iti. In the Marquesas islands, previous research briefly reported the existence of defensive structures, especially some fortified pā, in areas usually qualified as ‘marginal’. However, no site has yet been investigated in depth. In 2015, within the context of the larger Ua Huka project, we documented the pā of Mahaki, located between 700 and 800 m in altitude, and known in local oral traditions as a fortified refuge site for the Hokatu community during periods of conflicts. We recorded various categories of archaeological remains, the interpretations of which revealed a complex occupation of this area combining economic, defensive, and ritual functions. We argue that increasing inter-community violence and environmental pressure drove the progressive occupation of the high plateau. This study sheds new light on the Marquesan pā and their integration into the territories of the ‘enata chiefdoms. KEYWORDS: settlement patterns, margins, warfare, ritual, Polynesia, Marquesas Islands.

The Marquesas islands are a place of strong phytoplanktonic enhancement, whose original mechanisms have not been explained yet. Several mechanisms such as current−bathymetry interactions or island run-off can fertilize waters in the immediate vicinity or downstream of the islands, allowing phytoplankton enhancement. Here, we took the opportunity of an oceanographic cruise carried out at the end of 2018, to combine in situ and satellite observations to investigate two phytoplanktonic blooms occurring north and south of the archipelago. First, Lagrangian diagnostics show that both chlorophyll-a concentrations (Chl) plumes are advected from the islands. Second, the use of Finite-size Lyaponov Exponent and frontogenesis diagnostics reveal how the Chl plumes are shaped by the passage of a mesoscale cyclonic eddy in the south and by a converging front and finer-scale dynamic activity in the north. Our results based on these observations provide clues to the hypothesis of a fertilization from the islands themselves allowing phytoplankton to thrive. They also highlight the role of advection to disperse and shape the Chl plumes in two regions with contrasting dynamical regimes.

The islands of French Polynesia cover an area the size of Europe, though total land area is smaller than Rhode Island. Each hot spot archipelago (Societies, Marquesas, Australs) is chronologically arranged. With the advent of molecular techniques, relatively precise estimations of timing and source of colonization have become feasible. We compile data for the region, first examining colonization (some lineages dispersed from the west, others from the east). Within archipelagos, blackflies (Simulium) provide the best example of adaptive radiation in the Societies, though a similar radiation occurs in weevils (Rhyncogonus). Both lineages indicate that Tahiti hosts the highest diversity. The more remote Marquesas show clear examples of adaptive radiation in birds, arthropods and snails. The Austral Islands, though generally depauperate, host astonishing diversity on the single island of Rapa, while lineages on other islands are generally widespread but with large genetic distances between islands. More recent human colonization has changed the face of Polynesian biogeography. Molecular markers highlight the rapidity of Polynesian human (plus commensal) migrations and the importance of admixture from other populations during the period of prehistoric human voyages. However, recent increase in traffic has brought many new, invasive species to the region, with the future of the indigenous biota uncertain.

A new grenadier species, Coelorinchus ganymedes sp. nova, from the waters of the Marquesas Islands, belonging to the group of species “ C. hubbsi ”, has been described. The new species is most similar to C. gladius and C. spilonotus , but differs in color, fewer rows of spinules on body scales, and a number of proportions. A key has been compiled to determine the species of the group “ C. hubbsi ”.

Classified as Critically Endangered, the Ultramarine Lorikeet Vini ultramarina is one of the world’s most threatened lorikeet species. Endemic to the Marquesas Islands in French Polynesia, the species was formerly distributed over most islands in the archipelago, but is today found primarily on the island of Ua Huka, its range having contracted significantly in recent decades. Habitat alteration and loss, and over-exploitation of natural resources, are cited as impacting the Ultramarine Lorikeet, but the influence of introduced black rats Rattus rattus as predators has been implicated as the primary threat to the species. To assess population status and document aspects of the species biology, including habitat preferences and diet, we conducted the first systematic surveys of the species during two independent surveys spaced seven years apart (2002 and 2009). Population estimates of 2,011 ± 284 (in 2002) and 1,922 (in 2009) individuals on Ua Huka suggest the population was relatively healthy and stable between these periods. However, surveys and searches of other islands in the species’ contemporary range, where black rats occur, either failed to document the species or noted very few individuals. These findings highlight the critical importance of Ua Huka as a rat-free refuge and the value of our surveys as baseline estimates of the population status of the species. We discuss the conservation implications of our findings and propose recommendations to secure the species’ future survival.

In this paper Thor Heyerdahl's early attempts at ethnography and his first contact with Polynesian archaeology are discussed. It is argued that Heyerdahl, prior to his first Pacific expedition to the Marquesas Islands in 1937, carried with him a romanticized perception of the Polynesian people, imagining them to be the last living 'natural men'. This perception was shattered during his expedition, and the disappointing contrast between the imagined reality and the lived reality led Heyerdahl to separate the contemporary Polynesian population from the Polynesian archaeological record. It is further argued that this separation between contemporary Polynesians and the Polynesian archaeological record would form the foundation for the dual migration wave hypothesis Heyerdahl later launched with his 'Kon-Tiki theory'.