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Technical Support to Melad in Rat Eradication, Biosecurity Motu Surveys, and Seabird Monitoring at Kiritimati, Kiribati, November 2023
SPREP Publications, Biodiversity Conservation, BRB
Available Online

Cranwell, S.

,

Pierce, R.

,

Taabu, K.

2023
Field support and training was provided to Government of Kiribati staff at Kiritimati (Christmas Island) during 1-15 November 2023 as part of a Biopama project facilitated by BirdLife/SPREP. This project focused on rat eradication for biodiversity recovery, and associated outcome monitoring and capacity building. Specific objectives (and outcomes) included eradicating Kimoa (Rattus exulans) which had reinvaded Big Nimroona and SW Nimroona motu in 2017 (both motu were baited 6 days apart); confirming the status of invasives and birds on other key motu (checks of other significant motu indicated that Kimoa remain absent and rat-sensitive birds are thriving as a result); monitoring of endangered seabirds revealed that the Kiritimati population of Te Ruru continues to increase, while a large number of smaller motu provide secure nesting for Te Bwebwe ni Marawa; determining island and motu biosecurity needs (detailed biosecurity needs lists were completed and motu surveillance protocols adapted); and some additional training was completed for all.
Habitat change mediates the response of coral fish populations to terrestrial run-off
Available Online

Albert, Simon

,

Brown, Christopher J.

,

Jupiter, Stacy D.

,

Klein, Carissa

,

Lin, Hsien-Yung

,

Maina, Joseph M.

,

Mumby, Peter J.

,

Tullock, Vivitskaia J. D.

,

Wenger, Amelia S.

2017
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.