Rapid assessment for a new invasive species threat: the case of the Gambian giant pouched rat in Florida.

Wildlife Research 33: 439–448.

Volltext

Abstract:

The Gambian giant pouched rat (Cricetomys gambianus) is a large rodent that has established a breeding population in the Florida Keys. Should it successfully disperse to mainland Florida, it could continue spreading through much of North America where significant negative ecological and agricultural consequences could result. We rapidly developed the information for implementing an efficient and successful eradication program before dispersal to the mainland occurs. This included development of monitoring and indexing methods and their application to define the animal’s range, the development of baits attractive to Gambian giant pouched rats, efficacy testing of toxicants, and development of bait-delivery devices that exclude native animals. Gambian giant pouched rats appeared confined to the western two-thirds of Grassy Key, but have dispersed across a soil-filled causeway west to Crawl Key. We identified preferred habitat characteristics and potential dispersal pathways. We developed photographic and tracking tile methods for detecting and indexing Gambian giant pouched rats, both of which work well in the face of high densities of non-target species. We identified a commercial anticoagulant bait and we developed a zinc phosphide (an acute toxicant) bait matrix that were well accepted and effective for controlling Gambian giant pouched rats. We also developed a bait station for delivering toxic bait to Gambian giant pouched rats without risk to native species. We consider that the criteria are met for a successful eradication to commence.

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Donnerstag, 12 Januar 2023 14:32

WITMER, G. W. & HALL, P. (2011)

Attempting to eradicate invasive Gambian giant pouched rats (Cricetomys gambianus) in the United States: lessons learned.

In: VEITCH, C. R., CLOUT, M. N. & Towns, D. R. (eds.). Island invasives: eradication and management: 131-134. IUCN, Gland, Switzerland.

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Abstract:

Gambian giant pouched rats (Cricetomys gambianus) are native to Africa, but they are popular pets in the United States. They caused a monkeypox outbreak in the Midwestern United States in 2003 in which 72 people were infected. A free-ranging population became established on the 400 ha Grassy Key in the Florida Keys, apparently after a release by a pet breeder. This rodent species is known to cause extensive crop damage in Africa and if it reaches the mainland US, many impacts, especially to the agriculture industry of Florida, can be expected. An apparently successful inter-agency eradication effort has run for just over three years. We discuss the strategy that has been employed and some of the difficulties encountered, especially our inability to ensure that every animal could be put at risk, which is one of the prime pre-requisites for successful eradication. We also discuss some of the recent research with rodenticides and attractants, using captive Gambian rats, that may help with future control and eradication efforts.

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Buffalo in the Northern Territory.

21 Seiten. Technical Bulletin of the  Conservation Commission of the Niorthern Territory.

Abstract:

An aerial survey was conducted to obtain an estimate of the numbers of buffalo throughout their range in the Northern Territory and to determine their distributional pattern at the time of the survey. These data were required to form the basis for future management decisions.

The total of 282,870 head was higher than previous estimates. Higher densities were all associated with the coastal floodplain systems. Major concentrations were found in the Wagait, Marrakai and Kapaiga strata. No lage concentrations occurred more than about 100 km inland from the coast.

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Sonntag, 08 Januar 2023 10:45

SAALFELD, K. (2014)

Feral buffalo (Bubalus bubalis): distribution and abundance in Arnhem Land, Northern Territory.

21 Seiten, NT Govt.

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Summary:

Populations of feral buffalo Bubulas bubalis in Arnhem Land provide both an economic opportunity and a source of significant environmental damage. There has been no consistent management of feral buffalo in the Northern Territory since the Brucellosis and Tuberculosis Eradication Campaign (BTEC) of the late 1980s and early 1990s. Local control programs have been undertaken in response to concern about buffalo impacts, but these programs have not been coordinated or integrated at the regional level. The development of a strategic management program for feral buffalo in Arnhem Land requires adequate baseline data on the distribution and abundance of buffalo across the region.

From 9 June to 23 June 2014, an aerial survey was conducted to determine the distribution and abundance of feral buffalo (and other large feral vertebrates) in Arnhem Land, Northern Territory. The total survey area of 91,658 km2 was surveyed at a sampling intensity of 3.6%. Species counted were buffalo, cattle, donkey, horse and pig. Buffalo counts were corrected for perception (observer) bias, but uncorrected for availability (habitat) bias.

The corrected population estimate for feral buffalo in Arnhem Land was 97,923 ± 9,327, a density of 1.07 ± 0.10 buffalo per km2. This estimate has a precision of 9%, which is considered good for such broad-scale aerial survey. Population estimates for other feral species were not calculated as sightings were too few for estimation with an acceptable level of precision.

The 2014 survey recorded relatively high buffalo densities in a number of areas:

  • a large area to the north-west of Bulman and south-east of the Arnhem Land Plateau;
  • the floodplains of the Blyth and Cadell Rivers;
  • the coastal floodplains between the Blyth and Glyde River mouths;
  • the floodplains and wetlands to the south-west of Buckingham Bay;
  • the floodplains and wetlands north of the Roper River, downstream from Ngukurr;
  • the south-west corner of the survey area.

Previous (1985 and 1998) surveys also recorded high buffalo densities in the Bulman area, but these surveys showed moderate to low buffalo density throughout the rest of Arnhem
Land.

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Sonntag, 18 Dezember 2022 11:19

LÉGER, F. & RUETTE, S. (2005)

Le Chien viverrin en France.

faune sauvage n° 269/novembre 2005: 5-13.

Zusammenfassung:

Le Chien viverrin, petit carnivore de la famille des canidés, est présent en France mais ne nous est pas familier pour autant (lire l’encadré 1).Il est vrai qu’il s’agit d’une nouvelle acquisition pour la faune européenne et que son aire de répartition originelle se limitait à l’Asie orientale.Comme pour d’autres espèces exogènes, son histoire récente a été celle d’une introduction suivie d’une rapide extension sur notre continent. Le présent article fait le point des quelque 70 mentions du Chien viverrin enregistrées depuis une trentaine d’années sur notre territoire...

Volltext (PDF)

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Sonntag, 18 Dezember 2022 10:48

BAUER, K. (1983)

Der Marderhund Nyctereutes procyonoides (Gray, 1834) in Österreich - erste gesicherte Nachweise (Mammalia austriaca 9).

Annalen des Naturhistorischen Museums in Wien. Serie B für Botanik und Zoologie 87:131-136.

Zusammenfassung:

Die Meldungen über Marderhund-Beobachtungen in Österreich werden listen-und kartenmäßig zusammengefaßt und das erste zur Untersuchung gelangende Belegstück dokumentiert.

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Sonntag, 18 Dezember 2022 10:44

AUBRECHT, G. (1995)

Waschbär (Procyon lotor) und Marderhund (Nyctereutes procyonoides) - zwei faunenfremde Tierarten erobern Österreich.

Stapfia 37, zugleich Kataloge des OÖ. Landesmuseums N.F. 84 (1995), 225-236.

Zusammenfassung:

Der ursprünglich nordamerikanische Waschbär ist seit 1974 von Westen her nach Österreich vorgedrungen und der ostasiatische Marderhund, der von Osten her einwandert, lässt sich in Österreich schon seit den 1950er Jahren nachweisen. Unterscheidungsmerkmale und die Ausbreitungsgeschichte dieser beiden Arten werden kurz beschrieben. Mit den Ergebnissen einer Umfrage bei den österreichischen
Landesjagdverbänden, Literaturhinweisen und Auskünften von Fachkollegen wird die aktuelle Situation seit 1984 diskutiert. Waschbären sind in Vorarlberg, Salzburg, Oberösterreich, Niederösterreich und neuerdings auch in der Steiermark nachgewiesen. Hinweise in Tirol dürften auf lokal entkommene Tiere zurückzuführen sein. Der sehr vereinzelt schon seit den 1950er Jahren in Österreich nachgewiesene Marderhund, wird in den 1970er Jahren und seit Ende der 1980er Jahre häufiger festgestellt. Er kommt im Burgenland, in Niederösterreich, Oberösterreich und Salzburg vor. Eine Dynamik der Ausbreitung und des Populationswachstums ist bei beiden Arten zu beobachten, die Bestände haben sich bisher nicht stabilisiert.

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European Code of Conduct om Zoological Gardens and Aquaria and Invasive Alien Species.

$40 Seiten, illustriert. Europarat, Straßburg.

Inhalt

1. INTRODUCTION
2. SCOPE AND AIM
3. BACKGROUND
3.1. The history of zoological gardens and aquaria
3.2. Zoological gardens and aquaria as pathways for IAS
3.2.1. IAS originating from zoological gardens and aquaria
3.3. The multifaceted role of zoological gardens and aquaria in conservation
4. LEGAL FRAMEWORK
5. IMPLEMENTING, MONITORING AND EVALUATING THE CODE
ACKNOWLEDGEMENTS
REFERENCES
APPENDIX
1. Adopt effective preventative measures to avoid unintentional introduction and spread of IAS
2. Take into account the risks of IAS introductions in all wildlife and habitat management projects
3. Proactively engage in awareness raising and outreach activities focusing on IAS and their impacts
4. Adopt best practice for supporting early warning and rapid response system for IAS
5. Be aware of all relevant regulations concerning zoological gardens
NOTES

 

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On the occurrence of three non-native cichlid species including the first record of a feral population of Pelmatolapia (Tilapia) mariae (Boulenger, 1899) in Europe.

Royal Society Open Science 4(5). Published:21 June 2017. https://doi.org/10.1098/rsos.170160

Abstract:

Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids (Amatitlania nigrofasciata) and tilapia (Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the discovery of spotted tilapia (Pelmatolapia mariae) in the Gillbach, the first record of a reproducing population of this species in Europe. It has been hypothesized that Oreochromis sp. in the Gillbach are descendants of aquaculture escapees and our mtDNA analysis found both O. mossambicus and O. niloticus maternal lineages, which are commonly used for hybrids in aquaculture. Convict cichlids and spotted tilapia were most probably introduced into the Gillbach by aquarium hobbyists. Despite their high invasiveness worldwide, we argue that all three cichlid species are unlikely to spread and persist permanently beyond the thermally influenced range of the Gillbach river system. However, convict cichlids from the Gillbach are known to host both native and non-native fish parasites and thus, non-native cichlids may constitute threats to the native fish fauna. We therefore strongly recommend continuous monitoring of the Gillbach and similar systems.

lukas-biblio

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Samstag, 02 Juli 2022 14:13

CASSINELLO, J. (2017)

Datasheet report for Ovis aries musimon (European mouflon).

In: CAB International (Hrsg.): Invasive Species Compendium.

Zusammenfassung:

The European mouflon is a wild sheep that originates from the Mediterranean islands of Corsica and Sardinia; it is thought to be descended from ancient (Neolithic) domestic sheep of Asian ancestry. It has been introduced to many countries in Europe and some elsewhere, mostly as a quarry species for hunting; the extent to which populations have become established or increased varies from country to country. In most countries there is little evidence of serious adverse effects (although there has been little research on the subject), but the mouflon is considered invasive in Hawaii and the Canary Islands, where it has had serious adverse effects on native vegetation.

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