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Kahanahaikijb FINAL.Pdf Multi-Threat Control Strategies for Endangered Species Management on O‘ahu Army Lands in Hawai‘i Jane Reppun Beachy¹,², Stephanie Joe¹,², Stephen Mosher¹,², H. Kapua Kawelo¹, Jobriath Rohrer¹,², Matthew Keir¹,², Matthew Burt¹,², Vince Costello¹,², Michelle Mansker¹, Dan Sailer¹,², Krista Winger¹,², Lalasia Bialic-Murphy¹,² ¹O‘ahu Army Natural Resources Program, Department of the Army USAG-HI, Directorate of Public Works, Environmental Division, Natural Resources, (IMPC-HI-PWE), 947Wright Avenue, Wheeler Army Airfield Schofield Barracks, HI 96857-5013; [email protected] ²O‘ahu Army Natural Resources Program, Pacific Cooperative Studies Unit, Botany Department, University of Hawaii Manoa, 3190 Maile Way, St. John Hall #408, Honolulu, HI 96822-2279 The U.S. Army Garrison Hawai‘i is required to manage 67 endangered taxa, including 51 plants, nine tree snails, one bird species, and potentially six picturewing flies on the island of O‘ahu, Hawai‘i. These species occupy fragmented, disturbed habitat and face multiple threats. The O‘ahu Army Natural Resources Program (OANRP) manages these species across 56 geographically defined Management Units (MUs). Located on the rim of Mākua Valley, the Kahanahāiki MU encompasses 90 acres of mixed native/invasive mesic forest and is home to one tree snail species and both wild and reintroduced populations of 10 endangered plant taxa, including Cyanea superba ssp. superba, which was extirpated from the wild in 2003. Threats include feral pigs, black and Polynesian rats, mice, weeds, snails, slugs, and arthropods. The goal of threat control is to restore habitat in the MU such that endangered taxa thrive and maintain viable, stable populations. Multiple threats must be controlled simultaneously to achieve this goal. Feral ungulates were successfully excluded from the area in 1997 via fencing and snaring. A large snap trap grid, installed in early 2009, maintains low numbers of rodents. Weeds are primarily managed around rare taxa, although more aggressive restoration projects seek to create more continuous native forest. Both incipient and established weeds are controlled. Invasive slugs, predators of native seedlings, are controlled using a natural product containing iron phosphate. Native tree snails are protected from the ABSTRACT carnivorous snail Euglandina rosea via multiple barrier (salt, electricity, overhang) exclosures. Experiments to detect E. rosea using dogs are ongoing. Ant surveys allowed for the detection and eradication of an incipient population of Solenopsis geminata. Black twig borer traps are deployed around endangered trees. Rare taxa are responding to these efforts; in 2009, wild seedlings of C. superba were documented for the first time in over 30 years. Threat: Threat: THREATSThreat: Threat: UNGULATES: PIGS RODENTS: RATS CARNIVOROUS SNAILS SLUGS (Sus scrofa) (Rattus rattus, R. exulans) (Euglandina rosea) (Deroceras leave, Limax Threat Level: HIGH Threat Level: HIGH Threat Level: HIGH Seasonality: Year round Seasonality: Year round Seasonality: Year round maximus, Limax flavus, Control Level: Across Control Level: Across Control Level: Across Management Unit Meghimatium striatum) Management Unit Management Unit Acceptable Level of Activity: Unknown Acceptable Level of Activity: 0 Acceptable Level of Activity: 10% Threat Level: HIGH Seasonality: Wet season Resources Threatened/ Damage Observed Control Level: Localized • Rats consume Achatinella mustelina, an endangered Acceptable Level of Activity: Unknown tree snail. Kahanahāiki is home to a large population Limax maximus of 300 snails. • Eggs of the ‘elepaio, or Chasiempis sandwichensis subsp. ibidis, a Hawaiian flycatcher, is predated by rats. Resources Threatened/ Damage Observed • Rat damage has been observed on fruit, seeds, meristems, and bark of a variety of common and rare • Pig wallows, trails, digging, feeding all impact Deroceras leave Hawaiian ecosystems, which evolved in the absence plants. of ungulates. • Select endangered plant taxa are particularly susceptible to rat damage: Cyanea superba subsp. Resources Threatened/ Damage Observed • General ecosystem integrity, especially vegetation superba, Schiedea obovata, and Delissea waianaensis. • Studies indicate that certain plant families are health, is heavily affected by pigs. highly susceptible to slugs, in particular Resources Threatened/ Damage Observed • Habitat for endangered plants; all taxa at risk, C. superba fruit with rat chew Campanulaceae and Caryophyllaceae. E. rosea attack Achatinella mustelina, an although gulch dwelling species most affected. • Endangered taxa in these families are Cyanea endangered tree snail. Kahanahāiki is home to a • • Habitat for endangered tree snails, Achatinella Rat predated A. mustelina shells superba subsp. superba, Schiedea obovata, S. relatively large population of 300 snails. mustelina. nuttalii, and Delissea waianaensis. E. rosea may also comsume other native snails. • Slugs are seedling predators. They have a Many native snail species are poorly studied. Basic • significant negative impact on seedling survival for information, like taxonomy and distribution, are both C. superba and S. obovata. unknown for many. • Slug damage has been observed on stems and apical meristems of certain plants. This damage is not always fatal, but may reduce plant health and limit reproductive capacity. • Ecosystem effects of slugs are unknown. Pig damage Control Methods • Fence construction/ pig exclusion Control Methods • Transects, to detect activity level along fence, • OANRP is following New Zealand DOC Best potential fence breaches Too close for comfort. E. rosea on right with young Practices for snap trap grids. A. mustelina on left. E. rosea prefer to consume small snails, • Snares, to reduce pig pressure on the outside • Population suppression via a grid of covered snap and often ingest the entire shell of its prey. of the fence traps encompassing all of Subunit I and part of Adult and subadult A. mustelina from Kahanahāiki. Subunit II. Deroceras leave consuming • Activity-level monitoring with tracking tunnels. C. superba seedlings Current Status Control Methods • Pilot project grid of 440 traps installed May 2009. No U.S. government approved control methods exist. The grid protects 90 acres and is checked 1x or 2x a • OANRP is working towards the development of a month, depending on rat seasonality. • control method. A pilot project evaluating the efficacy • Tracking tunnels are monitored monthly. and feasibility of Sluggo® as a means of eliminating • Monitoring of seed rain, seedling recruitment, alien slugs in native forest is underway. slug and snail populations, arthropods, and A. Sluggo® is an organic molluscide with the active mustelina is ongoing to determine grid efficacy. • ingredient iron phosphate. It has no affect on birds, mammals, fish, or other invertebrates. It is ingested Adult snails are larger than 18mm, orally and interferes with proper digestion, causing subadults between 8-18mm, and juveniles less than 8mm. death in 48-72 hours. •Sluggo® may kill Copper/zinc barrier Current Status native snails. • Subunit I fence pig-free since 1998. • Beer traps and • Transects along fence line monitored quarterly. physical barriers of • 57 snares deployed in high activity zones in copper/zinc are labor intensive, expensive Subunit 2 S. obovata fruit with rodent chew and have only limited Planned Actions efficacy. • Maintain Subunit I fence. Rat trap in E. rosea are cannibalistic While not a preferred food, E. • Construct Subunit II fence; eradicate pigs from protective box rosea will eat slugs Current Status area using combination of hunting and snaring. • Research completed by OANRP indicates that Planned Actions • Monitor fenceline transects quarterly to detect pig Sluggo® is effective at killing slugs and has a postitive activity level along fence, potential breaches, and • Maintain snap trap grid. effect on seedling survival. Monitor rat activity with tracking tunnels damage from severe weather. • • Permitting is being pursued with the Environmental Continue monitoring of ecosystem response • Continue using snares in Subunit II to protect • Protection Agency to register Sluggo® for use in Subunit I. When Subunit II fence complete, variables to rat control forestry settings in Hawai‘i. Trials are carried out reevaluate need for snares. • Fine tune grid layout, trap density, and re-bait under an Experimental Use Permit overseen by the frequency to maximize efficacy E. rosea’s cryptic coloration, Hawai‘i Dept. of Agriculture. Develop more effective bait ( peanut butter) Measures of Success • small size, and tendency to • Sluggo® should not be deployed in proximity to trees • Endangered species recovery Measures of Success hide beneath leaf litter and harboring endangered tree snails, such as A. Endangered species recovery rocks makes them difficult • to locate mustelina. • Trials with Sluggo® continue around C. superba Control Methods reintroductions to determine optimal application • No effective chemical control methods exist. frequency. • Physical barriers/ exclosures. Current barriers Planned Actions include E. rosea deterrents, including a salt trough, • Continue trials and pursue Sluggo® permitting. electric fence wire, and a curved overhang •Track seasonal changes in slug densities • Search and removal by hand. • Ensure bait does not harm A. mustelina. Healthy Measures of Success S. obovata E. rosea Overhang • Endangered species recovery exclosure Reintroduction with natural recruitment E. rosea
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