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Hines, Ellen M.
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2002 |
Conservation of the dugong (Dugong dugon) along the Andaman coast of Thailand. In: P. Dearden (ed.), Environmental protection and rural development in Thailand: challenges and opportunities.
Bangkok, White Lotus Press: 155-180.
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LaCommare, Katherine S.; Brault, Solange; Self-Sullivan, Caryn; Hines, Ellen M.
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2012 |
Trend detection in a boat-based method for monitoring sirenians: Antillean manatee case study.
Biological Conservation 152: 169-177. 2 tabs. 4 figs. DOI: 10.1016/j.biocon.2012.02.021. Aug. 2012.
–ABSTRACT: Accurate monitoring is a critical step in evaluating the conservation and management needs of endangered species. We evaluated a low cost, effective survey method for monitoring West Indian manatees (Trichechus manatus manatus) in Belize, Central America. The objectives for this paper are (1) to evaluate a count-based population index derived from a boat-based survey method, (2) to examine trends in manatee abundance in the Drowned Cayes area, (3) to conduct a power analysis to explore our ability to detect a trend and the ramifications of survey structure on trend detection. We used a generalized linear model to evaluate the impact of environmental conditions on sighting probability and to determine whether the number of manatees observed per 20-min scan changed from 2001 to 2007. We used simulations to determine statistical power – the ability to detect potential declines of 10%, 25% or 50% over 15 years and for various sampling regimes. The number of manatees sighted per scan was not affected by sighting conditions. There was no change in the mean number of manatees sighted per scan from 2001 to 2007. Our ability to detect a trend ranged from 9% to 100% depending on the level of decline, scan duration, number of points surveyed and number of surveys. This survey protocol is a practical and repeatable way to examine population trends of sirenians in similar habitats around the world.
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Hines, Ellen M.
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2012b |
A framework for sirenian conservation in developing countries. Chap. 28 in: E. M. Hines et al. (eds.), Sirenian conservation: issues and strategies in developing countries (q.v.).
Gainesville, University Press of Florida (xiv + 326): 246-253. 2 figs.
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Edwards, Holly H.; Stone, Suzanne B. P.; Hines, Ellen M.; Gomez, Nicole Auil; Winning, Birgit E.
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2014 |
Documenting manatee (Trichechus manatus manatus) presence at Turneffe Atoll, Belize, Central America and its conservation significance.
Caribbean Jour. Sci. 48(1): 71-75. 1 fig.
–ABSTRACT: Belize in Central America supports one of the largest populations of endangered Antillean manatees in the Caribbean. In 2012, a country–wide survey resulted in the highest count ever recorded (507 manatees). Manatee use of atolls has only been documented at Turneffe Atoll in Belize. Manatees in Belize, including those that use Turneffe, have been shown to be impacted by human activities including habitat degradation, entanglement in fishing gear, poaching, and watercraft. The atoll itself faces threats to its diversity and productivity. In 2002, the Oceanic Society began monitoring manatees on Turneffe to document numbers, distribution, and seasonality of use to facilitate the atoll's designation as a protected area. Since 2002, 52 sightings of manatees have been recorded at Turneffe, including cow/calf pairs, indicating it is an important part of the resource network used by the manatees. Protecting the atoll should be a priority for all working to protect manatees and Belize's natural resources.
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