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ABSTRACT: Coastal fish populations are typically threatened by multiple human activities, including fishing pressure and run-off of terrestrial pollution. Linking multiple threats to their impacts on fish populations is challenging because the threats may influence a species directly, or indirectly, via its habitats and its interactions with other species. Here we examine spatial variation in abundance of coral reef fish across gradients of fishing pressure and turbidity in Fiji. We explicitly account for multiple pathways of influence to test the alternative hypotheses that (1) habitat moderates predation by providing shelter, so habitat loss only affects prey fish populations if there are abundant predators, (2) habitat change co-drives biomass of both prey and predator functional groups. We examined responses of 7 fish functional groups and found that habitat change co-drives both predator and prey responses to turbidity. Abundances of all functional groups were associated with changes in habitat cover; however, the responses of their habitats to turbidity were mixed. Planktivore and piscivore abundance were lower in areas of high turbidity, because cover of their preferred habitats was lower. Invertivore, browser and grazer abundance did not change strongly over the turbidity gradient, because different components of their habitats exhibited both increases and decreases with turbidity. The effects of turbidity on fish populations were minor in areas where fish populations were already depleted by fishing. These findings suggest that terrestrial run-off modifies the composition of reef fish communities indirectly by affecting the benthic habitats that reef fish use.

Coastal ecosystems can be degraded by poor water quality. Tracing the causes of poor water quality back to land-use change is necessary to target catchment management for coastal zone management. However, existing models for tracing the sources of pollution require extensive data-sets which are not available for many of the world’s coral reef regions that may have severe water quality issues. Here we develop a hierarchical Bayesian model that uses freely available satellite data to infer the connection between land-uses in catchments and water clarity in coastal oceans. We apply the model to estimate the influence of land-use change on water clarity in Fiji. We tested the model’s predictions against underwater surveys, finding that predictions of poor water quality are consistent with observations of high siltation and low coverage of sediment-sensitive coral genera. The model thus provides a means to link land-use change to declines in coastal water quality

Climate change is often referred to as the defining challenge of our time, and it is well known that Pacific Island States are particularly vulnerable to the adverse effects of climate change. Indeed, these adverse effects are already very tangible for most communities across the region. Coastal features are visibly changing, with rising sea-levels, higher king tides and storm surges, saltwater intrusion and changing weather patterns posing an increasing threat to the livelihoods of Pacific Island communities. The threats are amplified by extreme weather events becoming more intense and more damaging as a result of climate change, with Cyclone Pam recently causing loss of human life and catastrophic damage in Vanuatu, and to a lesser extent in the Solomon Islands, Tuvalu and Kiribati. 2 While communities and governments—assisted by regional, international and nongovernmental organizations—are proactively building resilience and adapting to climate change, there is a real risk of much more severe and damaging impacts materializing in the coming decades.3 The threats are so severe that most, if not all, Pacific Island States face the threat of losing some or all of their habitable territory as a result of climate change, with related risks of the loss of traditional livelihoods and large-scale involuntary displacement

Newsletter on Pacific Libraries

2008 Annual Report for the University of the South Pacific.

Traditionally, Pacific Island people have lived a subsistence lifestyle with taboos and practices that ensured sustainability of resource use. However, modernization with all its implications has reduced the quality of life with problems affecting the very pillars of sustainable development. There are many disadvantages that derive from small size, a narrow range of resources, excessive dependence on international trade, high population density, over use of natural resources, relatively small watersheds, costly infrastructure, fragile ecosystems and high levels of endemism.

Traditionally, Pacific Island people have lived a subsistence lifestyle with taboos and practices that ensured sustainability of resource use. However, modernization with all its implications has reduced the quality of life with problems affecting the very pillars of sustainable development. There are many disadvantages that derive from small size, a narrow range of resources, excessive dependence on international trade, high population density, over use of natural resources, relatively small watersheds, costly infrastructure, fragile ecosystems and high levels of endemism.

This report presents data from the most comprehensive assessment undertaken on differing levels of ecological survey effort employed in Fiji. The four methods examined in order of increasing taxonomic complexity (number of variables or species observed) were FLMMA community monitoring, Reef Check, Akuila Cakacaka's Masters thesis method* and that used by Coral Cay Conservation in Fiji. All of these methods utilise a belt transect underwater visual census methodology with differing lengths of transects though for standardisation, all were set at 20m long by 5m wide by 5m high in this investigation. All methods employed a target species list. Of these target species lists, only the FLMMA methodology observed individuals from all of its target taxa; the other methodologies observed only 67, 70 and 59% of the species included on the target species List for the 'Reef Check method', 'Akuila's method' and the 'Coral Cay method' respectively.