Modifications of the shore line in the Society islands (French Polynesia)

Aubanel, Annie; Marquet, Nicolas; Colombani, J.M.; Salvat, Bernard

doi:10.1016/s0964-5691(99)00023-x

Cited by 18 publications

(9 citation statements)

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“…The coastal marine habitats of Moorea that form the feeding, breeding and nursery areas for blacktip reef sharks (see Mourier & Planes ) have been subjected to extensive manipulation and destruction since 1960 (Aubanel et al . ; Lecchini et al . ; Benet ).…”

Section: Discussionmentioning

confidence: 99%

Blacktip reef sharks, Carcharhinus melanopterus, have high genetic structure and varying demographic histories in their Indo‐Pacific range

et al. 2014

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For free-swimming marine species like sharks, only population genetics and demographic history analyses can be used to assess population health/status as baseline population numbers are usually unknown. We investigated the population genetics of blacktip reef sharks, Carcharhinus melanopterus; one of the most abundant reef-associated sharks and the apex predator of many shallow water reefs of the Indian and Pacific Oceans. Our sampling includes 4 widely separated locations in the Indo-Pacific and 11 islands in French Polynesia with different levels of coastal development. Four-teen microsatellite loci were analysed for samples from all locations and two mitochondrial DNA fragments, the control region and cytochrome b, were examined for 10 locations. For microsatellites, genetic diversity is higher for the locations in the large open systems of the Red Sea and Australia than for the fragmented habitat of the smaller islands of French Polynesia. Strong significant structure was found for distant locations with FST values as high as ~0.3, and a smaller but still significant structure is found within French Polynesia. Both mitochondrial genes show only a few mutations across the sequences with a dominant shared haplotype in French Polynesia and New Caledonia suggesting a common lineage different to that of East Australia. Demographic history analyses indicate population expansions in the Red Sea and Australia that may coincide with sea level changes after climatic events. Expansions and flat signals are indicated for French Polynesia as well as a significant recent bottleneck for Moorea, the most human-impacted lagoon of the locations in French Polynesia.

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Section: Discussionmentioning

confidence: 99%

Blacktip reef sharks, Carcharhinus melanopterus, have high genetic structure and varying demographic histories in their Indo‐Pacific range

et al. 2014

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“…Human activities, in the form of sediment dredging, agriculture, pearl farming, tourism, and construction of buildings and protective shoreline structures may all have direct and indirect impacts on island sediment budgets and shoreline change (Aubanel et al, 1999;Ford, 2012). Only two islands on Manihi show evidence of direct shoreline modification: the first as a result of the construction of a port and the stabilization of the shoreline in the village (Figures 9a and b), and the second as a result of the construction of an airport runway (Figures 9c and d).…”

Section: Anthropogenic Activitiesmentioning

confidence: 99%

Multidecadal Atoll Shoreline Change on Manihi and Manuae, French Polynesia

Yates¹,

Cozannet²,

Garçin³

et al. 2013

Journal of Coastal Research

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International audienceAs interest in the impact of sea-level rise on atoll islands increases, this study contributes to the growing database of observations of shoreline changes on South Pacific Islands, where few observations are currently available. Historical aerial photographs and recent satellite images were used to evaluate multidecadal surface area and shoreline changes on two atolls in French Polynesia: Manihi and Manuae. During the 40- to 50-year study period, atoll island surface area primarily increased or remained stable on Manihi and decreased on Manuae. Distinct ocean and lagoon shoreline changes were observed in different geographical regions of each atoll. On Manihi, ocean shoreline accretion rates were larger on the NW rim than the SE rim. On Manuae, atoll islands on the NE rim were eroding on the lagoon side and accreting on the ocean side, whereas islands on the SE rim showed the opposite trend. Sea-level rise is often thought to cause atoll erosion, but in this study, lagoon and ocean shorelines both eroded and accreted over a period when sea-level rise rates were greater than the global mean. Surface area changes related directly to anthropogenic activities were identified on only two of the 47 atoll islands. After completing a classification of the incident wave field, it was hypothesized that waves have an important role in controlling the shoreline change variability. Additional field surveys and in situ observations are needed to validate this hypothesis and to understand better island response to changing forcing factors

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“…Peoples in the South Pacific rely heavily on the "health" of their coastal resources, so when runoff is impairing the performance of ecosystems such as lagoons and coral reefs, it becomes a management issue. A combined terrestrial-marine "landscape" or "ecoscape" PACIFIC SCIENCE· April 2002 approach to management (and science) is increasingly being advocated from a number of different perspectives (e.g., Soicher and Peterson 1997, Aubanel et al 1999, Heyman and Kjerfve 1999, Mueller-Dombois 1999, Nittrouer and Driscoll 1999.…”

Section: Implications Oflagoonal Mixed Sedimentsmentioning

confidence: 99%

Mixed Siliciclastic-Skeletal Carbonate Lagoon Sediments from a High Volcanic Island, Viti Levu, Fiji, Southwest Pacific

Gussmann¹,

Smith²

2002

Pacific Science

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Modem sedimentation in the Navua-Suva Lagoon, southeastern Viti Levu, Fiji, derives from both allochthonous siliciclastics and autochthonous marine carbonates. Sediments are characterized by a high insoluble load, small grain size, a wide range of textures, and a high degree of mixing. The distribution of the two facies (skeletal-dominated muddy sandy gravel and skeletalbearing very fine sand to mud) is controlled by both the shallow-marine carbonate sediment productivity and sediment supply and dispersal processes from siliciclastic point sources across a narrow lagoon. Mollusks and Halimeda dominate the gravel fraction of the skeletal grains. Sediment budget estimates indicate that 97% of the siliciclastic supply bypasses the lagoon. Some 0.2 Mt/yr is accumulating in the lagoon, not yet enough to inhibit potential carbonate production ("-'0.1 Mt/yr) by a interreefal benthos that is at least somewhat sediment-tolerant. Contemporary allochthonous siliciclastic and autochthonous skeletal carbonate sedimentation in the lagoon results in true syndepositional (in situ) mixing. The central high volcanic island mass in a tropical setting produces the geomorphological (high topographic relief, narrow shelf), environmental (high rainfall), and ecological (shallow benthic area) conditions that lead to carbonate-siliciclastic mixing in lagoons along adjacent, mostly carbonate, coasts of oceanic islands, a high volcanic island mass effect. We propose that tropical in situ mixing of carbonate and siliciclastic sediments is more common in high volcanic island settings than previously appreciated. Such islands are thus excellent testing grounds for the study of carbonate-siliciclastic interactions. Their special characteristics highlight the need for better understanding of coastal physical processes of tropical Pacific high volcanic islands.

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Modifications of the shore line in the Society islands (French Polynesia)

Cited by 18 publications

References 0 publications

Blacktip reef sharks, Carcharhinus melanopterus, have high genetic structure and varying demographic histories in their Indo‐Pacific range

Blacktip reef sharks, Carcharhinus melanopterus, have high genetic structure and varying demographic histories in their Indo‐Pacific range

Multidecadal Atoll Shoreline Change on Manihi and Manuae, French Polynesia

Mixed Siliciclastic-Skeletal Carbonate Lagoon Sediments from a High Volcanic Island, Viti Levu, Fiji, Southwest Pacific

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