Trappability of Low Density Invasive Rats
On Aotea/Great Barrier Island, New Zealand, two invasive rat species (Pacific rats and ship rats) pose risks to the ecosystems and challenge the management in two sanctuaries. At Glenfern Sanctuary (83 ha) an eradication has successfully removed ship rats and a predator-proof fence prevents reinvasi...
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ftcdlib:oai:escholarship.org/ark:/13030/qt402476qd 2023-05-15T18:05:28+02:00 Trappability of Low Density Invasive Rats Gronwald, Markus Russell, James C. 2020-01-01 application/pdf https://escholarship.org/uc/item/402476qd unknown eScholarship, University of California qt402476qd https://escholarship.org/uc/item/402476qd public Proceedings of the Vertebrate Pest Conference, vol 29, iss 29 black rat camera interspecific competition invasive species Pacific rat Rattus exulans Rattus rattus rodents ship rat article 2020 ftcdlib 2020-11-20T15:17:44Z On Aotea/Great Barrier Island, New Zealand, two invasive rat species (Pacific rats and ship rats) pose risks to the ecosystems and challenge the management in two sanctuaries. At Glenfern Sanctuary (83 ha) an eradication has successfully removed ship rats and a predator-proof fence prevents reinvasion. However, Pacific rats persist in low abundance. At Windy Hill Sanctuary (770 ha) intensive rodent control maintains both species at low abundance despite ongoing reinvasion. A capture-mark-recapture study was conducted between February and April in 2016 and repeated between July and September 2017 to determine population densities, confirm species composition, and analyse the effects of time, population density, and interspecific competition on rat behaviour. Live traps were monitored with camera traps to analyse behaviour of rats around traps. Population density and detection probability of Pacific rats varied between times reflecting seasonality in food abundance and rat reproduction. The detection probability of Pacific rats also differed between sites, being higher at Glenfern Sanctuary than at Windy Hill Sanctuary, presumably due to interspecific competition with ship rats. Where Pacific rats were the sole species they were captured in traps in the first night. However, in coexistence with ship rats, Pacific rat detection was delayed by at least ten days. Population density influenced the number of trap encounters and interactions but did not significantly influence the capture rate. Interspecific competition was identified as problematic for monitoring, controlling, and eradicating Pacific rats. Article in Journal/Newspaper Rattus rattus University of California: eScholarship Barrier Island ENVELOPE(78.396,78.396,-68.431,-68.431) New Zealand Pacific |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
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language |
unknown |
topic |
black rat camera interspecific competition invasive species Pacific rat Rattus exulans Rattus rattus rodents ship rat |
spellingShingle |
black rat camera interspecific competition invasive species Pacific rat Rattus exulans Rattus rattus rodents ship rat Gronwald, Markus Russell, James C. Trappability of Low Density Invasive Rats |
topic_facet |
black rat camera interspecific competition invasive species Pacific rat Rattus exulans Rattus rattus rodents ship rat |
description |
On Aotea/Great Barrier Island, New Zealand, two invasive rat species (Pacific rats and ship rats) pose risks to the ecosystems and challenge the management in two sanctuaries. At Glenfern Sanctuary (83 ha) an eradication has successfully removed ship rats and a predator-proof fence prevents reinvasion. However, Pacific rats persist in low abundance. At Windy Hill Sanctuary (770 ha) intensive rodent control maintains both species at low abundance despite ongoing reinvasion. A capture-mark-recapture study was conducted between February and April in 2016 and repeated between July and September 2017 to determine population densities, confirm species composition, and analyse the effects of time, population density, and interspecific competition on rat behaviour. Live traps were monitored with camera traps to analyse behaviour of rats around traps. Population density and detection probability of Pacific rats varied between times reflecting seasonality in food abundance and rat reproduction. The detection probability of Pacific rats also differed between sites, being higher at Glenfern Sanctuary than at Windy Hill Sanctuary, presumably due to interspecific competition with ship rats. Where Pacific rats were the sole species they were captured in traps in the first night. However, in coexistence with ship rats, Pacific rat detection was delayed by at least ten days. Population density influenced the number of trap encounters and interactions but did not significantly influence the capture rate. Interspecific competition was identified as problematic for monitoring, controlling, and eradicating Pacific rats. |
format |
Article in Journal/Newspaper |
author |
Gronwald, Markus Russell, James C. |
author_facet |
Gronwald, Markus Russell, James C. |
author_sort |
Gronwald, Markus |
title |
Trappability of Low Density Invasive Rats |
title_short |
Trappability of Low Density Invasive Rats |
title_full |
Trappability of Low Density Invasive Rats |
title_fullStr |
Trappability of Low Density Invasive Rats |
title_full_unstemmed |
Trappability of Low Density Invasive Rats |
title_sort |
trappability of low density invasive rats |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/402476qd |
long_lat |
ENVELOPE(78.396,78.396,-68.431,-68.431) |
geographic |
Barrier Island New Zealand Pacific |
geographic_facet |
Barrier Island New Zealand Pacific |
genre |
Rattus rattus |
genre_facet |
Rattus rattus |
op_source |
Proceedings of the Vertebrate Pest Conference, vol 29, iss 29 |
op_relation |
qt402476qd https://escholarship.org/uc/item/402476qd |
op_rights |
public |
_version_ |
1766176934275842048 |