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Predation of sea turtle eggs by rats and crabs

Stokes, H., Esteban, N., Hays, G. C.

Egg predation by invasive and native species may have severe impacts on endangered species and negatively affect species recovery. We assessed the levels of egg predation within green turtle (Chelonia mydas) clutches on the island of Diego Garcia (7.42°S, 72.45°E), Chagos Archipelago (Indian Ocean). Native coconut crabs (Birgus latro) and ghost crabs (Ocypode spp.), as well as introduced black rats (Rattus rattus), were predators of eggs, with these species entering nests via tunnels dug obliquely in the sand. Often whole eggs were removed from clutches. For example, the mean clutch size at oviposition (mean 127.8 eggs, n = 23, range = 74–176) was significantly larger than at the end of incubation (mean 110.9 hatched and unhatched eggs, n = 16, range = 9–147). In other cases, egg predation was recorded where the egg had been opened and contents were eaten in the nest. Overall, hatching success (the percentage of eggs laid leading to a hatchling emerging from the egg) was 64.9%, while 3.1% of eggs were predated within nests, 18.1% died during incubation without predation and 13.9% were removed. We reviewed evidence from 34 sites around the world identifying 36 predators that were either native (e.g., crabs, and goannas, n = 30) or invasive (e.g., rats, and pigs, n = 8). Depending on location, a predator could be identified as both native and invasive (e.g., dogs). We discuss how either nest protection and/or invasive predator eradication may be used to increase egg survival and when these approaches might be used.

Operations Manual - Regional Technical Support Mechanism (RTSM) and Rapid Response Fund (RRF)

SPREP Publications, Climate Change Resilience

Available Online

SPREP

The Regional Technical Support Mechanism (RTSM) and Rapid Response Fund (RRF) is a collaborative undertaking of all Council of Regional Organisations in the Pacific (CROP) agencies and their associated development partners and donors. It is a true reflection of the Pacific island region, which promotes the spirit of cooperation and collaboration. The establishment of the RTSM and RRF is a step towards a ‘transformative change’ that is taken by the CROP agencies, to efficiently serve the priority and needs of Pacific Island Countries and Territories in relation to climate change adaptation and mitigation The purpose of this Manual is to guide the members of the RTSM Project Committee (PC), the Working Arm of the CEO Subcommittee on Climate Change and Disaster Resilient Development (WARD) and the RTSM Coordinator (RC) on the operations of the RTSM and associated RRF. It sets out the standards of probity, transparency and accountability that contributors and potential contributors to the Fund expect in the governance and operations of both the RTSM and RRF. The Manual includes an RTSM & RRF Policies and Procedures which lists the types of assistance available, and how to request assistance under the RRF. As part of the ‘scaling up of good practices’ approach, the standards as set out in the Manual also provide an example for countries that do not have Pilot Programme for Climate Resilience (PPCR) country tracks and are interested in replicating such a mechanism to administer and manage climate change funding. The RTSM PC and the WARD may approve amendments to the Manual and associated RTSM and RRF Policies and Procedures.

Demonstration of predator management methods / by Dave Harding and Dick Veitch

Harding, D. and Veitch, D.

Predator control activities conducted in Hawaii/Pacific Islands: can New Zealand's model be applied in this area? / by Ernie Kosaka

Island and Ocean Ecosystems, BRB

Kosaka, E.

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