Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina
Exotic ungulates are among the top global invasive mammals and a threat to biodiversity. Axis deer (Axis axis) and wild boar (Sus scrofa) are of increasing concern in multiple regions. A management program reduced wild boar abundance and soil damage below target levels through controlled still shoot...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13873547_v20_n6_p1431_Gurtler http://hdl.handle.net/20.500.12110/paper_13873547_v20_n6_p1431_Gurtler |
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paper:paper_13873547_v20_n6_p1431_Gurtler2023-06-08T16:12:56Z Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina Invasion biology Population dynamics Protected areas Sustainability Ungulate Wildlife management biological invasion deer hunting introduced species management practice pig population dynamics protected area range expansion sustainability wildlife management Argentina El Palmar National Park Entre Rios Canis familiaris Cervidae Cervus axis Mammalia Sus scrofa Ungulata Exotic ungulates are among the top global invasive mammals and a threat to biodiversity. Axis deer (Axis axis) and wild boar (Sus scrofa) are of increasing concern in multiple regions. A management program reduced wild boar abundance and soil damage below target levels through controlled still shooting from watchtowers and dog-hunting performed by recreational hunters at El Palmar National Park, Argentina. Here we assess program impacts on axis deer over a 10-year period in which 2380 deer were dispatched, and document two largely unexpected outcomes: increasing axis deer abundance toward a plateau, and a strong inverse correlation between deer and wild boar numbers. Unlike the initial steep decline and subsequent stabilization of wild boar, deer abundance indexed by standardized catch-per-unit-effort increased at 37.6% per year over 0–5 years post-intervention (YPI) and stabilized from 7 YPI on when still-shooting effort averaged 948 hunting party-hours per quarter. Deer catch was non-linearly related to still-shooting effort. Timing of deer and boar catches did not differ significantly regardless of sex, season and YPI. Catch-per-unit-effort indices and nightly spotlight deer counts showed similarly increasing trends. The fraction of older adult deer declined over 0–4 YPI and remained stable thereafter. Sex ratios were consistently skewed toward males only among older adults. Failure to reduce deer abundance may be explained by several major processes: protracted exponential growth of the deer population after park invasion; deer regional expansion with increasing immigration; insufficient sex- and stage-biased hunting mortality, and competitor (and perhaps predator) release from wild boar. © 2017, Springer International Publishing AG, part of Springer Nature. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13873547_v20_n6_p1431_Gurtler http://hdl.handle.net/20.500.12110/paper_13873547_v20_n6_p1431_Gurtler |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Invasion biology Population dynamics Protected areas Sustainability Ungulate Wildlife management biological invasion deer hunting introduced species management practice pig population dynamics protected area range expansion sustainability wildlife management Argentina El Palmar National Park Entre Rios Canis familiaris Cervidae Cervus axis Mammalia Sus scrofa Ungulata |
| spellingShingle |
Invasion biology Population dynamics Protected areas Sustainability Ungulate Wildlife management biological invasion deer hunting introduced species management practice pig population dynamics protected area range expansion sustainability wildlife management Argentina El Palmar National Park Entre Rios Canis familiaris Cervidae Cervus axis Mammalia Sus scrofa Ungulata Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| topic_facet |
Invasion biology Population dynamics Protected areas Sustainability Ungulate Wildlife management biological invasion deer hunting introduced species management practice pig population dynamics protected area range expansion sustainability wildlife management Argentina El Palmar National Park Entre Rios Canis familiaris Cervidae Cervus axis Mammalia Sus scrofa Ungulata |
| description |
Exotic ungulates are among the top global invasive mammals and a threat to biodiversity. Axis deer (Axis axis) and wild boar (Sus scrofa) are of increasing concern in multiple regions. A management program reduced wild boar abundance and soil damage below target levels through controlled still shooting from watchtowers and dog-hunting performed by recreational hunters at El Palmar National Park, Argentina. Here we assess program impacts on axis deer over a 10-year period in which 2380 deer were dispatched, and document two largely unexpected outcomes: increasing axis deer abundance toward a plateau, and a strong inverse correlation between deer and wild boar numbers. Unlike the initial steep decline and subsequent stabilization of wild boar, deer abundance indexed by standardized catch-per-unit-effort increased at 37.6% per year over 0–5 years post-intervention (YPI) and stabilized from 7 YPI on when still-shooting effort averaged 948 hunting party-hours per quarter. Deer catch was non-linearly related to still-shooting effort. Timing of deer and boar catches did not differ significantly regardless of sex, season and YPI. Catch-per-unit-effort indices and nightly spotlight deer counts showed similarly increasing trends. The fraction of older adult deer declined over 0–4 YPI and remained stable thereafter. Sex ratios were consistently skewed toward males only among older adults. Failure to reduce deer abundance may be explained by several major processes: protracted exponential growth of the deer population after park invasion; deer regional expansion with increasing immigration; insufficient sex- and stage-biased hunting mortality, and competitor (and perhaps predator) release from wild boar. © 2017, Springer International Publishing AG, part of Springer Nature. |
| title |
Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| title_short |
Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| title_full |
Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| title_fullStr |
Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| title_full_unstemmed |
Differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern Argentina |
| title_sort |
differential long-term impacts of a management control program of axis deer and wild boar in a protected area of north-eastern argentina |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13873547_v20_n6_p1431_Gurtler http://hdl.handle.net/20.500.12110/paper_13873547_v20_n6_p1431_Gurtler |
| _version_ |
1768541719609999360 |