Monitoring predators to optimize their management for marine turtle nest protection

Engeman, Richard M.; Martin, R. Erik; Constantin, Bernice; Noel, Ryan; Woolard, John

doi:10.1016/s0006-3207(02)00295-1

Cited by 116 publications

(75 citation statements)

References 13 publications

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“…Such methodology might permit optimisation of timing and placement of control devices in the same fashion that greatly improved efficacy and efficiency elsewhere (Engeman et al 2003. Motion-triggered digital cameras served well to detect Gambian giant pouched rats while providing data suitable for monitoring abundance.…”

Section: Discussionmentioning

confidence: 99%

“…Both the daily number of individual Gambian giant pouched rats and the daily number of intrusion measurements provided appropriate data structures for calculating abundance indices (AI) at each site according to the analytical methods outlined in Engeman (2005), and as applied for passive tracking indices (e.g. Engeman et al 2000Engeman et al , 2003. A linear model incorporating random effects described measurements at each camera station each day, with no assumptions of independence among stations or days.…”

Section: Application Of Cameras For Indexingmentioning

confidence: 99%

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

Engeman¹,

Woolard²,

Perry³

et al. 2006

Wildl. Res.

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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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Section: Discussionmentioning

confidence: 99%

Section: Application Of Cameras For Indexingmentioning

confidence: 99%

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

Engeman¹,

Woolard²,

Perry³

et al. 2006

Wildl. Res.

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“…At the same time, predators abound along many beaches where nesting could otherwise succeed. Nest predation can have severe impacts on reproductive success for sea turtles and shorebirds (e.g., Ellis et al, 2007;Engeman et al, 2003;Engeman and Smith, 2007;Kadlec, 1971;Wilcox and Donlan, 2007). Cayo Costa and North Captiva Islands, along Florida's west coast each offer suitable, and state park-protected, beach habitat for nesting by sea turtles and shorebirds, but each also has had a history of low nest success due to predation.…”

Section: Introductionmentioning

confidence: 99%

“…Compounding the problem, raccoon populations flourish in association with humans where they often receive artificial support through refuse or direct feeding (Dickman and Doncaster, 1987;Riley et al, 1998;Smith and Engeman, 2002). Raccoons are notorious nest predators (e.g., Engeman et al, 2003;Garmestani and Percival, 2005;Mroziak et al, 2000;NRC, 1990;Rogers et al, 1996;Stancyk, 1982;Williams-Walls et al, 1983), with the pervasiveness and severity of raccoon predation on sea turtle nests in Florida prompting a leading sea turtle conservation organization to identify raccoons as the single greatest source of sea turtle mortality in Florida (Caribbean Conservation Corporation/ Sea Turtle Survival League, no date).…”

Section: Introductionmentioning

confidence: 99%

Dramatic and immediate improvements in insular nesting success for threatened sea turtles and shorebirds following predator management

Engeman¹,

Duffiney²,

Braem

et al. 2010

Journal of Experimental Marine Biology and Ecology

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Predation critically threatens reproductive success of sea turtles and shorebirds at many of Florida's beaches. We examined the biological and bioeconomic results of predator management on two adjacent barrier islands, Cayo Costa and North Captiva, along Florida's west coast. Both islands suffered severe nesting losses due to predation and disturbance due to raccoons, while Cayo Costa also was impacted by a large population of feral swine. In 2006, our initial year of study, neither island received predator management and no least tern production occurred on either island, and sea turtle nest predation was 74% and 60%, respectively, for Cayo Costa and North Captiva. Predators were managed in 2007 on Cayo Costa while North Captiva served as an untreated reference island. North Captiva again had no least tern production and sea turtle nest predation was 84%. In contrast, Cayo Costa produced 31 least terns and sea turtle nest predation plummeted to 16%. Both islands received predator management in 2008 when Cayo Costa and North Captiva respectively produced 20 and 55 least terns and had 15% and 0% sea turtle nest predation. The entire costs for predator management by experts over the course of the study was $USD 39,636, while the returns in additional production of least tern young and hatchling sea turtles was valued over $USD 1.1 million for a resulting benefit-cost ratio of 27.8.Published by Elsevier B.V.

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“…Damage reduction efforts that target the depredating species are carried out to varying degrees for each of the examples above. Raccoons are managed at many marine turtle nesting beaches in Florida (e.g., Engeman et al 2003a), pearly-eyed thrashers and black rats are managed in the Caribbean National Forest in the vicinities of Puerto Rican parrot nests (Cano 2002), coyotes and other predators often are removed prior to and after black-footed ferret releases (e.g., Utah Division of Wildlife Resources 1995), massive baiting campaigns are waged against red foxes in Australia (e.g., Armstrong 1998), and well in excess of $1 million annually is applied to control the spread of brown tree snakes from Guam to other vulnerable locations, and to reclaim areas on Guam for protection and/or reintroduction of endangered species (Engeman & Vice 2001).…”

Section: Introductionmentioning

confidence: 99%

Monetary Valuation Methods for Economic Analysis of the Benefit-Costs of Protecting Rare Wildlife Species from Predators

Engeman¹,

Shwiff²,

Smith

et al. 2002

Integrated Pest Management Reviews

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Many threatened and endangered species are negatively impacted by predation. Management of the predators that are geographically and temporally in position to threaten species of concern can greatly aid in their conservation. However, decisions on management strategies are based within economic constraints, while the success of management actions is measured by wildlife resource improvement. Here, we review methods for applying monetary valuations for threatened and endangered species so that economic analyses of management actions can be used to help guide and evaluate management decisions. A variety of applied examples are provided to demonstrate the principles.

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Monitoring predators to optimize their management for marine turtle nest protection

Cited by 116 publications

References 13 publications

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

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

Dramatic and immediate improvements in insular nesting success for threatened sea turtles and shorebirds following predator management

Monetary Valuation Methods for Economic Analysis of the Benefit-Costs of Protecting Rare Wildlife Species from Predators

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