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  • Tags / Keywords Management of established invasives
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Predation of sea turtle eggs by rats and crabs
BRB

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

2023
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.
Clean Boats, Clean Ports - A Framework to Protect Pacific Island Countries and Territories from Invasive Species
SPREP Publications, Island and Ocean Ecosystems, BRB
Available Online

Secretariat of the Pacific Regional Environment Programme

2023
The clean boats, clean ports framework is a Pacific Regional Invasive Species Management Support Service (PRISMSS) Protect our Islands (POI) initiative to enable countries to better secure international entry ports that are gateways to priority domestic destinations. This Battler Series publication supports the prevention of the spread of invasive species among islands within countries. The document outlines a flexible framework that recognises the diverse situations in Pacific island countries and territories and that capitalises on existing strengths, while highlighting achievable and aspirational targets. This publication is part of a collection of Battler guides on preventing the spread of invasive species in the Pacific region. For an introduction, read the Battler publications Protect our islands with biosecurity and Catch it early: invasive species early detection and rapid response. This guide is targeted for decision-makers prioritising improvements to prevent invasive species arriving, establishing, and spreading, to guide the implementation of targeted enhancements. The guide aligns with many aspects of the regional Guidelines and particularly C1. Biosecurity – Preventing the spread of invasive species across international or internal borders.