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Leachate from microplastics impairs larval development in brown mussels
Biodiversity Conservation

Gandara e Silva, Pablo Pena

,

Gusmão, Felipe

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Nobre, Caio Rodrigues

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Pereira, Camilo Dias Seabra

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Resaffe, Pryscila

2016
Microplastic debris is a pervasive type of contaminant in marine ecosystems, being considered a major threat to marine biota. One of the problems of microplastics is that they can adsorb contaminants in extremely high concentrations. When released from the particle, these contaminants have the potential to cause toxic effects in the biota. So far, reports of toxic effects are mostly linked with the direct exposure of organisms through ingestion of contaminated microplastics. There is little information on the toxicity of leachates from microplastics to marine organisms. In this study, we conducted experiments to evaluate the toxicity of leachates from virgin and beached plastic pellets to embryo development of the brown mussel (Perna perna). We compared the efficiency of two test procedures, and evaluated the toxicity of beached pellets collected in a coastal marine protected area.We observed that mussel embryo is sensitive to leachate from both virgin and beached pellets. However, the toxicity of the leachate from beached pellets was much higher than that of virgin pellets.We suggest contaminants adsorbed onto the surface of beached pellets were responsible for the high toxicity of leachate from beached pellets, while the toxicity of leachate from virgin pellets was mainly due to plastic additives. Our results suggest microplastic debris may be harmful even if ingestion is not the only or main pathway of interaction of marine organisms with contaminated plastic debris.
Evaluation of storm surge risk: A case study from Rarotonga, Cook Islands
Climate Change Resilience

de Scally, Fes A.

2013
This study reports on a preliminary assessment of storm surge risk from tropical cyclones at Rarotonga, Cook Islands. Analysis of a 175 year record of cyclones from the Cook Islands indicates minimum annual probabilities of 16% for storm surges and 5% for major storm surge impacts at Rarotonga. Storm surges have historically inundated areas of the coastal lowland where virtually all human activities and infrastructure are currently located. The impacts of such events have been particularly severe in the Cook Islands' capital of Avarua and adjacent communities on the north coast of Rarotonga. Detailed infrastructure mapping combined with analysis of historic storm surge impacts and cyclones tracks in the vicinity of Rarotonga indicates that the storm surge risk is greatest along the north coast where the majority of the Cook Islands' government functions and commercials, industrial, transportation and communication infrastructure is located. Damage to this infrastructure at the shoreline can have serious repercussions throughout the Cook Islands. Any efforts to increase the country's resilience to such impacts must be undertaken within the larger goal of adaptation to future climate changes and rising sea levels. The greatest risk presently to human life arises from many cyclone safety centres in locations where they are exposed to storm surges or flooding. A top priority should be relocation of these shelters to safer locations further inland so that they can provide suitable shelter from storm surges and flooding as well as tsunamis, taking into account other hazards presented by Rarotonga's rugged topography.
Cetacean diversity, common occurrence and community importance in Fijian waters

Batibasaga, Aisake

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Chand, Prerna

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Dulunaqio, Sirilo

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Fox, Margaret

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Jupiter, Stacy

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Miller, Cara E.

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Naisilisili, Waisea

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Nand, Yashika

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Sharma-Gounder, Saras

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Smith, Brian

2016
Fiji has demonstrated a strong commitment to cetacean conservation via national, regional and international plans and agreements. To provide baseline information in support of these efforts, this paper provides an updated listing of cetacean species found in Fijian waters and identifies locations where cetaceans have been noted on a consistent basis. Information for this review was sourced from peer-reviewed publications, field reports, historical whaling records, national consultations, anecdotal and opportunistic sources, as well as a national database held by the Fiji Government's Department of Fisheries. Reliable and recent records were confirmed for 10 cetacean species in Fijian waters. In addition, less reliable records and regional species' information provides support for the occurrence of at least 14 additional species or groups of similar-looking species that could not be identified more specifically. Thirteen hotspot areas within the Fiji Economic Exclusive Zone were preliminarily identified as being particularly important for cetaceans, including numerous sites within the Vatu-i-Ra and Lomaiviti passages and surrounding waters. Issues with the available data include uneven coverage, inherent biases within available sources, and difficulties with species identification and verification in some cases. Nevertheless, it is hoped that this review will provide a reference point from which to move forward with cetacean management and conservation efforts in Fiji.
Status and Genetic Structure of Nesting Populations of Leatherback Turtles (Dermochelys coriacea) in the Western Pacific
Available Online

Ambio, Levi

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Bakaressy, Jacob

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Benson, Scott R.

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Dutton, Peter H.

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Hitipeuw, Creusa

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Petro, George

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Pita, John

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Rei, Vagi

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Zein, Mohammad

2007
A group of researchers, managers and tribal leaders with extensive local knowledge from Papua New Guinea, Solomon Islands, Vanuatu and Papua, Indonesia, provided new information on the status of leatherback nesting populations in the western Pacific Ocean. Twenty-eight nesting sites were identified, of which 21 were previously unknown or poorly described. Although data are still incomplete, we estimate a total of ca. 5000-9200 nests currently laid at 4 sites along the northwest coast (Bird's Head Peninsula) of Papua, Indonesia. Genetic analysis by using mitochondrial deoxyribonucleic acid sequences identified a total of 6 haplotypes among the 106 samples analysed for Solomon Islands, Papua and Papua New Guinea, including a unique common haplotype that is only found in these western Pacific populations. There was no significant difference in haplotype that is only found in these western Pacific populations. There was no significant difference in haplotype frequencies among these rookeries, which suggests that they represent a metapopulation composed of a single genetic rock. Further work is needed to define the demographic structure within this metapopulation.