Variation in dental occlusion and arches among melanesians of bougainville island,papua New Guinea. I. Methods,age changes,sex differences and population comparisons

Population studies of malocclusion lack comparability because of the subjective criteria employed in the definition of malocclusion. Alternatively, individual characteristics of occlusion can be quantified and compared within and between populations. Measurements were taken from the dental cases of 319 male an 359 female Melanesians from Bougainville, Papua New Guinea. The cross-sectional age changes from 12 to 68 years of age included an increase in intermolar arch width, a decrease in arch length and intercanine arch width, and increased crowding and malalignment. Neither age nor sex accounted for a large proportion of the differences among individuals. When compared to industrialized groups, the Bougainville population had a slight reduction in variance for most characteristics. Only the sagittal molar relationship was markedly less variable on Bougainville. The results emphasize that a quantitative evaluation of individual occlusal variables may reveal differences within and between populations not detected when simple malocclusion frequencies are reported.     

Good anthropology in dark times: Critical appraisal and ethnographic application

‘Dark Anthropology’ and its complementary ‘Anthropology of the Good’ have become influential and debated notions in anthropology in recent years. I here parse distinctive features of these emphases, address their relation to theory and to ethnography, and consider the stakes involved in concretely applying their conceptual designations. I discuss the general shift in anthropology from grand theory to key concept, and the topical delimitation of theory that results. In larger purview, Dark Anthropology and the Anthropology of the Good both have long theoretical genealogies as well as practical contexts of political and social understanding, including vis‐à‐vis recent events in the U.S. and elsewhere. I suggest that considering the relationship between politico‐economically structured inequality and attempts to assert positive meaning and purpose is the most productive way to ethnographically apply their alternative conceptualisations. This brings to greater focus the thorny question of whose understanding of inequality or suffering, or of moral value and positive wellbeing, is being articulated—the sentiments of the people studied, or the concepts of the analyst? It seems vital to examine both analytic and indigenous views of dark times, and of the good, to refine our understanding of both, that is, in order to consider our complementary conceptualisations in relation to both sides of the emic/etic coin. This refines our understanding of local sensibilities and also of the appropriate limit points of our own conceptual associations.     

Phylogenetic identification and population differentiation of bottlenose dolphins (Tursiops spp.) in Melanesia,as revealed by mitochondrial DNA

The taxonomic status of many dolphin populations remains uncertain in poorly studied regions of the world's ocean. Here we attempt to clarify the phylogenetic identity of two distinct forms of bottlenose dolphins (Tursiops spp.) described in the Melanesian region of the Pacific Ocean. Mitochondrial DNA control region sequences from samples collected in New Caledonia (n = 88) and the Solomon Islands (n = 19) were compared to previously published sequences of Tursiops spp., representing four phylogenetic units currently recognized within the genus. Phylogenetic reconstructions confirm that the smaller coastal form in Melanesia belongs to the same phylogenetic unit as T. aduncus populations in the Pacific, but differs from T. aduncus in Africa, and that the larger more oceanic form belongs to the species T. truncatus. Analyses of population diversity reveal high levels of regional population structuring among the two forms, with contrasting levels of diversity. From a conservation perspective, genetic isolation of T. aduncus in the Solomon Islands raises further concern about recent impacts of the commercial, live‐capture export industry. Furthermore, the low level of mtDNA diversity in T. aduncus of New Caledonia suggests a recent population bottleneck or founder effect and isolation. This raises concerns for the conservation status of these local populations.     

Drinking Money and Pulling Women: Mobile Phone Talk,Gender, and Agency in Vanuatu

This paper examines aspects of gendered discourse around mobile phones in Vanuatu, focusing especially on the talk of high-ranking men from the northern Raga-speaking region of Pentecost Island. Rather than being restricted to the technologies or their direct capacities alone, it is argued that the local reception of new technologies such as mobile phones should be contextualised in terms of broader dialogues of change, and should also take into account the visual and discursive expressions of culture that accompanies them, including in the form of marketing. Examination of the ‘impact’ of such new technologies should also include taking account of broader local meanings and messages that become associated with them. As the ethnography presented here suggests, while mobile phones themselves certainly provide a useful tool for furthering positive social change, such as in the empowerment of women, the meanings and narratives that surround them may by marked contrast entail more negative entrenchments of unequal relations of power.     

Dispersal of butterflies in a New Guinea rainforest: using mark–recapture methods in a large,homogeneous habitat

相似文献   

Panbiogeography of New Caledonia,south‐west Pacific: basal angiosperms on basement terranes,ultramafic endemics inherited from volcanic island arcs and old taxa endemic to young islands

Aim To investigate areas of endemism in New Caledonia and their relationship with tectonic history. Location New Caledonia, south‐west Pacific. Methods Panbiogeographical analysis. Results Biogeographical patterns within New Caledonia are described and illustrated with reference to eight terranes and ten centres of endemism. The basement terranes make up a centre of endemism for taxa including Amborella, the basal angiosperm. Three of the terranes that accreted to the basement in the Eocene (high‐pressure metamorphic terrane, ultramafic nappe and Loyalty Ridge) have their own endemics. Main conclusions New Caledonia is not simply a fragment of Gondwana but, like New Zealand and New Guinea, is a complex mosaic of allochthonous terranes. The four New Caledonian basement terranes were all formed from island arc‐derived and arc‐associated material (including ophiolites) which accumulated in the pre‐Pacific Ocean, not in Gondwana. They amalgamated and were accreted to Gondwana (eastern Australia) in the Late Jurassic/Early Cretaceous, but in the Late Cretaceous they separated from Australia with the opening of the Tasman Sea and break‐up of Gondwana. An Eocene collision of the basement terranes with an island arc to the north‐east – possibly the Loyalty Ridge – is of special biogeographical interest in connection with New Caledonia–central Pacific affinities. The Loyalty–Three Kings Ridge has had a separate history from that of the Norfolk Ridge/New Caledonia, although both now run in parallel between Vanuatu and New Zealand. The South Loyalty Basin opened between Grande Terre and the Loyalty Ridge in the Cretaceous and attained a width of 750 km. However, it was almost completely destroyed by subduction in the Eocene which brought the Loyalty Ridge and Grande Terre together again, after 30 Myr of separation. The tectonic history is reflected in the strong biogeographical differences between Grande Terre and the Loyalty Islands. Many Loyalty Islands taxa are widespread in the Pacific but do not occur on Grande Terre, and many Grande Terre/Australian groups are not on the Loyalty Islands. The Loyalty Islands are young (2 Myr old) but they are merely the currently emergent parts of the Loyalty Ridge whose ancestor arcs have a history of volcanism dating back to the Cretaceous. Old taxa endemic to the young Loyalty Ridge islands persist over geological time as a dynamic metapopulation surviving in situ on the individually ephemeral islands and atolls found around subduction zones. The current Loyalty Islands, like the Grande Terre terranes, have inherited their biota from previous islands. On Grande Terre, the ultramafic terrane was emplaced on Grande Terre in the Eocene (about the same time as the collision with the island arc). The very diverse endemic flora on the ultramafics may have been inherited by the obducting nappe from prior base‐rich habitat in the region, including the mafic Poya terrane and the limestones typical of arc and intraplate volcanic islands.     

Dispersal has inhibited avian diversification in Australasian archipelagoes

Different models of speciation predict contrasting patterns in the relationship between the dispersal ability of lineages and their diversification rates. This relationship is expected to be negative in isolation-limited models and positive in founder-event models. In addition, the combination of negative and positive effects of dispersal on speciation can result in higher diversification rates at intermediate levels of dispersal ability. Using molecular phylogenies to estimate diversification rates, and wing morphology to estimate dispersal ability, we analysed the influence of dispersal on diversification in the avifauna of Australasian archipelagoes. Contrary to expectations given the fragmented nature of island systems, the relationship between dispersal ability and diversification rate was monotonically negative. While multiple mechanisms could generate this pattern, they all share a phase of range expansion that is decoupled from speciation.     

Quantitative hair form variation in seven populations

Although hair form has received much attention in the past, it has rarely been studied systematically, and never using direct curling variables. In the present study, seven groups were scored on eight variables, including four newly-devised curling variables. These data were analyzed using univariate and multivariate techniques to give information about the population relations and mechanisms of hair form. “Racial” groups were separated using a principal components analysis. African and Melanesian populations were shown to have significantly different quantitative hair form traits, especially in regard to their regularity of curvature. The physiological, environmental, and genetic factors contributing to hair form variation are discussed.