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  • Tags / Keywords mangrove
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  • Tags / Keywords pacifastacus leniusculus
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Successful eradication of signal crayfish (Pacifastacus leniusculus) using a non-specific biocide in a small isolated water body in Scotland
Island and Ocean Ecosystems, BRB
Available Online

Ballantyne, L.

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Baum, D.

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Bean, C.W.

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Long, J.

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Whitaker, S.

2019
The North American signal cray?sh (Pacifastacus leniusculus) has been present in Scotland since at least 1995 and the species is now known to be present in a number of catchments. Once established, few opportunities for containment exist and eradication can often be impossible to achieve. However, in small, isolated water bodies, the application of a non-cray?sh-speci?c biocide has provided the opportunity to remove this species permanently. In July 2011, signal cray?sh were discovered in a ?ooded quarry pond at Ballachulish in the Scottish Highlands. This is an isolated site located ~100 km from the nearest known population and it is likely that the population was established as the result of a deliberate release of these animals 10 years previously. Experience gained from using the eradication technique at other sites in the UK led to the site being treated with a natural pyrethrum biocide (Pyblast®) in June 2012. Post treatment monitoring from 2012–2017 indicates that eradication has been successful. Monitoring of native species a?ected by the biocide suggests that both invertebrates and amphibians quickly recolonised the quarry pond. Eradication of cray?sh using biocide is only feasible in water bodies where the entire population of cray?sh can be exposed to a lethal dose and the impact on non-target species can be accepted. The technique is not appropriate for large, connected water bodies, although it may be possible to treat short stretches of canals where biocide exposure can be controlled and isolated populations of cray?sh can be e?ectively treated.
Comprehensive Desk-top Review of Biodiversity, Conservation and Invasive Species Information for the Kingdom of Tonga
Island and Ocean Ecosystems, BRB
Available Online

Pagad. Shyama

2013
Situated between Fiji to the west and Samoa to the northeast, the Kingdom of Tonga (referred to as Tonga) is comprised of 171 scattered islands of which less than 50 are inhabited. The islands are mainly composed of limestone formed from uplifted coral. Current critical environmental concerns have arisen due to deforestation; damage to coral reefs and the introduction and spread of invasive alien species. Anthropogenic pressure has resulted in extensive modification of all ecosystems on the limestone islands of this group. Only uninhabited and steep volcanic islands still support large tracts of forest.