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Anderson CJ, Brennan LA, Bukoski WP, Hess SC, Hilton CD, Shiels AB, Siers SR, Kluever BM, Klug PE. Evaluation of roost culling as a management strategy for reducing invasive rose-ringed parakeet ( Psittacula krameri) populations. Biol Invasions 2023; 25:1403-1419. [PMID: 36713465 PMCID: PMC9862218 DOI: 10.1007/s10530-022-02984-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 12/08/2022] [Indexed: 01/22/2023]
Abstract
Rose-ringed parakeets (Psittacula krameri) are one of the most widespread invasive avian species worldwide. This species was introduced to the island of Kaua'i, Hawai'i, USA, in the 1960s. The rapidly increasing population has caused substantial economic losses in the agricultural and tourism industries. We evaluated the efficacy of a roost culling program conducted by an independent contractor from March 2020 to March 2021. We estimated island-wide minimum abundance was 10,512 parakeets in January 2020 and 7,372 in April 2021. Over 30 nights of culling at four roost sites, approximately 6,030 parakeets were removed via air rifles with 4,415 (73%) confirmed via carcasses retrieval. An estimated average of 45 parakeets were removed per hour of shooter effort. The proportion of adult females removed in 2020 was 1.9 × greater when culled outside of the estimated nesting season. Of the four roosts where culling occurred, the parakeets fully abandoned three and partially abandoned one site. Of the three fully abandoned roosts, an estimated average of 29.6% of birds were culled prior to roost abandonment. The roost culling effort was conducted during the COVID-19 pandemic, when tourist numbers and foot traffic were greatly reduced. It is unknown how public perception of roost culling in public areas may impact future efforts. Findings suggest roost culling can be utilized for management of nonnative rose-ringed parakeet populations when roost size is small enough and staff size large enough to cull entire roosts in no greater than two consecutive nights (e.g., if two shooters are available for three hours per night, roost culling should only be attempted on a roost with ≤ 540 rose-ringed parakeets). Supplementary Information The online version contains supplementary material available at 10.1007/s10530-022-02984-3.
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Affiliation(s)
- C. Jane Anderson
- Caesar Kleberg Wildlife Research Institute, Texas A&M University–Kingsville, Kingsville, TX USA
| | - Leonard A. Brennan
- Caesar Kleberg Wildlife Research Institute, Texas A&M University–Kingsville, Kingsville, TX USA
| | - William P. Bukoski
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services, Lihue, Hawai‘i USA
| | - Steven C. Hess
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services National Wildlife Research Center, Hawai‘i Field Station, Hilo, Hawai‘i USA
| | - Clayton D. Hilton
- Caesar Kleberg Wildlife Research Institute, Texas A&M University–Kingsville, Kingsville, TX USA
| | - Aaron B. Shiels
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services National Wildlife Research Center, Ft. Collins, CO USA
| | - Shane R. Siers
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services National Wildlife Research Center, Barrigada, Guam USA
| | - Bryan M. Kluever
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services National Wildlife Research Center, Florida Field Station, Gainesville, FL USA
| | - Page E. Klug
- United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Services National Wildlife Research Center, North Dakota State University, Department of Biological Sciences, Fargo, ND USA
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Control of invasive ring-necked parakeet (Psittacula krameri) in an island Biosphere Reserve (La Palma, Canary Islands): combining methods and social engagement. Biol Invasions 2020. [DOI: 10.1007/s10530-020-02351-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Adapting to urban ecosystems: unravelling the foraging ecology of an opportunistic predator living in cities. Urban Ecosyst 2020. [DOI: 10.1007/s11252-020-00995-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Robinson RA, Gardner B. Advances in modelling demographic processes: The Euring 2017 Analytical Meeting. Methods Ecol Evol 2019. [DOI: 10.1111/2041-210x.13127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Robert A. Robinson
- European Union of Ring Schemes (Euring) and British Trust for OrnithologyThe Nunnery Thetford UK
| | - Beth Gardner
- School of Environmental and Forest SciencesUniversity of Washington Seattle Washington
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