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Five eradications, three species, three islands: overview, insights and recommendations from invasive bird eradications in the Seychelles

Biodiversity Conservation, BRB

Available Online

Agricole, J.

Angell, G.

Banville, P.

Bunbury, N.

Constance A.

Fleischer-Dogley, F.

Friedlander J.

Haverson, P.

Leite, L.

Mahoune, T.

Melton-Durup, E.

Moumou, J.

Page, N.

Raines, K.

van de Crommenacker, J.

Management and eradication techniques for invasive alien birds remain in their infancy compared to invasive mammal control methods, and there are still relatively few examples of successful avian eradications. Since 2011, five separate eradication programmes for invasive birds have been conducted on three islands by the Seychelles Islands Foundation (SIF). Target species were prioritised according to their threat level to the native biodiversity of the UNESCO World Heritage Sites of the Seychelles, Aldabra Atoll and Vallée de Mai, which SIF is responsible for managing and protecting. Red-whiskered bulbuls (Pycnonotus jocosus) and Madagascar fodies (Foudia madagascariensis) occurred on Assumption, the closest island to Aldabra, which, at the time, had no known introduced bird species. The growing population of ring-necked parakeets (Psittacula krameri) on Mahé posed a threat to endemic Seychelles black parrots (Coracopsis barklyi) on Praslin where the Vallée de Mai forms their core breeding habitat. In 2012, red-whiskered bulbuls and Madagascar fodies were detected on Aldabra, so an additional eradication was started. All eradications used a combination of mist-netting and shooting. The intensive part of each eradication lasted three years or less. On Assumption, 5,279 red-whiskered bulbuls and 3,291 Madagascar fodies were culled; on Mahé, 545 parakeets were culled; and on Aldabra 262 Madagascar fodies and one red-whiskered bulbul were culled. Each programme underwent 12 years of follow-up monitoring before eradication was confi rmed, and four of the fi ve eradications have been successful so far. None of these species had previously been eradicated in large numbers from other islands so the successes substantially advance this fi eld of invasive species management. The challenges and insights of these eradications also provide unique learning opportunities for other invasive avian eradications.

House sparrow eradication attempt on Robinson Crusoe Island, Juan Fernández Archipelago, Chile

Biodiversity Conservation, BRB

Available Online

Bonham, J.

Campbell, K.

Hagen, E.

House sparrows (Passer domesticus) compete with native bird species, consume crops, and are vectors for diseases in areas where they have been introduced. Sparrow eradication attempts aimed at eliminating these negative effects highlight the importance of deploying multiple alternative methods to remove individuals while maintaining the remaining population naïve to techniques. House sparrow eradication was attempted from Robinson Crusoe Island, Chile, in the austral winter of 2012 using an experimental approach sequencing passive multi-catch traps, passive single-catch traps, and then active multi-catch methods, and finally active single-catch methods. In parallel, multiple detection methods were employed and local stakeholders were engaged. The majority of removals were via passive trapping, and individuals were successfully targeted with active methods (mist nets and shooting). Automated acoustic recording, point counts and camera traps declined in power to detect individual sparrows as the population size decreased; however, we continued to detect sparrows at all population densities using visual observations, underscoring the importance of local residents participation in monitoring. Four surviving sparrows were known to persist at the conclusion of eff orts in 2012. Given the lack of formal biosecurity measures within the Juan Fernández archipelago, reinvasion is possible. A local network of citizen observers is the best tool available to detect house sparrows at low density, however ongoing, dedicated eradication funding does not exist. Opportunistic removals via shooting have been possible from 20132016, but elusive individual sparrows were seen during a small number of days each year suggesting remnant group(s) exist in yet unknown forest locations.

GEF6 regional invasives project - project overview.

Available Online

Secretariat of the Pacific Regional Environment Programme.

Pacific island ecosystems make up one of the worlds biodiversity hotspots, with high levels of endemism. However, Pacific islands areparticularly vulnerable to invasive species; because of their isolation and relatively recent human occupation, native species have not evolved to cope with the impacts of predators, herbivores...

Pacific Regional Invasive Management Support Services (PRISMSS) Invasive species programme management course

Available Online

Factsheet for the Invasive species programme management course

Pacific Regional Invasive Species Management Support Service (PRISMSS)

SPREP Publications, Biodiversity Conservation, BRB

Available Online

The PRISMSS is a regional mechanism, which facilitates the scaling up of invasive species management in the Pacific. It provides management support for on the groud invasive species actions

Regional assessment on ecosystem-based disaster risk reduction and biodiversity in Oceania.

Available Online

The Oceania region is very prone to natural disasters having experienced two Category 5 cyclones in as many years; Tropical Cyclone (TC)Pam struck Vanuatu on 13 March 2015 and TC Winston struck Fiji on 20 February 2016.

Using the mitigation hierarchy to manage impacts on biodiversity in Pacific island countries and territories = Renforcer la hiérarchie datténuation1dans les Etats et Territoires Insulaires Océaniens.

Available Online

The mitigation hierarchy (MH) is a step-by-step tool used to limit the negative impacts of development projects. It can be used for many disciplines; this guidance note focuses on its use to manage risks and impacts to biodiversity. Very similar approaches can be used for ecosystem services and even social impacts.

Wetlands of Wallis and Futuna.

Biodiversity Conservation, BRB

Available Online

Secretariat of the Pacific Regional Environment Programme.

In 2014, with support from the French Government, Wallis and Futuna informed SPREP of its intention to identify nationally significant wetlands for future designation as wetlands of international importance (Ramsar Sites) under the Convention on Wetlands (Ramsar, Iran, 1971).

Regional joint meeting of the ACPMEA2 and Inform projects.

Available Online

SPREPs Environmental and Monitoring Governance (EMG) Programme convened a regional meeting for participants to review the successes of the ACPMEA Project Phase 2, discuss and share experiences in implementing the ACPMEA project, and establish clear linkages to the Inform project.

Rat and lagomorph eradication on two large islands of central Mediterranean: differences in island morphology and consequences on methods, problems and targets

Biodiversity Conservation, BRB

Available Online

Baccetti, N.

Capizzi, D.

Cencetti, T.

De Pietro, F.

Giannini, F.

Gotti, C.

Puppo, F.

Quilghini, E.

Raganella Pelliccion, E.

Sammuri, G.

Sposimo, P.

Trocchi, V.

Vagniluca, S.

Zanichelli, F.

Montecristo and Pianosa islands, although approximately equal in surface area (c. 1,000 ha), di?er greatly in substrate, human presence, vegetation and altitude (650 m vs. 30 m asl, respectively). The former island hosts one of the largest yelkouan shearwater (Pu?nus yelkouan) populations in Italy, the latter a depleted remnant of once numerous Scopolis shearwaters (Calonectris diomedea). Two consecutive EU-funded LIFE projects have been designed to protect these seabird populations. On Montecristo, rough and inaccessible, aerial delivery of toxic baits in January-February 2012 eradicated black rats (Rattus rattus) and feral rabbits (Oryctolagus cuniculus) (originally a non-target species), with no permanent consequences on a local, ancient population of wild goats (Capra hircus). Eradication on Pianosa, currently underway (started January 2017), is being performed by ground baiting, delivered by 4,750 dispensers placed on a 50 m × 50 m grid throughout the island. The latter operation is included in a multi-species eradication aimed at several other target species, among which was the brown hare (Lepus europaeus), apparently introduced around 1840. Genetic analyses on the ?rst trapped hares showed that this was the last uncontaminated and viable population of L. europaeus subsp. meridiei in existence. Whether of natural origin or introduced, the commencement of eradication of this population has instead created the awareness of a taxon otherwise unavailable for conservation elsewhere. While both projects address the same conservation issues (protection of shearwater colonies and restoration of natural communities), they di?er greatly regarding economic cost, public perception, e? ort needed to maintain results in the long term and e?ects on non-target species. In the present paper, speci?c attention has been paid to the comparison between bait delivering techniques, results obtained, the array of problems originating from the complex regulatory framework and reactions by the general public.

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