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Using Pooled Local Expert Opinions (PLEO) to Discern Patterns in Sightings of Live and Dead Manatees (Trichechus senegalensis, Link 1785) in Lower Sanaga Basin, Cameroon.
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- Author(s): Mayaka TB;Mayaka TB; Takoukam Kamla A; Takoukam Kamla A; Self-Sullivan C; Self-Sullivan C
- Source:
PloS one [PLoS One] 2015 Jul 21; Vol. 10 (7), pp. e0128579. Date of Electronic Publication: 2015 Jul 21 (Print Publication: 2015).- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't- Language:
English - Source:
- Additional Information
- Source: Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
- Publication Information: Original Publication: San Francisco, CA : Public Library of Science
- Subject Terms:
- Abstract: We aimed at unveiling patterns in live and dead manatee sightings in the Lower Sanaga Basin, Cameroon. For this purpose, the expert opinions of 133 local fishers were collected during in-person interviews, distilled using categorical data analysis, and checked against scientific literature. The five main results are as follows: manatees were sighted averagely once a week in lakes, rivers, and the coast & estuaries, mostly in group sizes of 2-3; the odds of sighting live manatees (respectively dead manatees) decreased (respectively increased) from inland lakes to estuaries and the coast, via rivers; manatee carcasses were reported in all habitats, albeit more frequently in rivers; a distribution map based on fishers' reports show two manatee concentration areas: Lake Ossa and the Malimba-Mbiako section of River Sanaga; the number of manatees was perceived as increasing despite incidental and directed catches. Thus, our findings corroborate earlier assessments of the Lower Sanaga Basin as being a major manatee conservation area. Additionally, from these results and the literature, we identified three hypotheses about local manatee persistence: deep pools such as lakes offer year round sanctuaries, not just dry-season refugia; seasonality of specific habitat variables determine manatee occurrence patterns; and local variability in habitat encroachment mediate the meta-population dynamics of manatee in the Lower Sanaga Basin. Finally, we examine the implications for data requirements in light of the small ecological scale at which the surveyed fishers ply their trade. Thus, consonant with the Malawi principles for the ecosystem approach to management (www.cbd.int/ecosystem), we recommend collecting data preferably at landscape scale, through a participatory monitoring program that fully integrates scientific and traditional knowledge systems. This program should include, amongst others, a standardised necropsy protocol for collecting mortality and biological data together with sonar and radio-telemetry technology to discern manatee use and movements between critical habitat components.
- References: J Environ Manage. 2006 Jan;78(2):194-9. (PMID: 16112339)
Ambio. 2021 May;50(5):967-969. (PMID: 33566330)
Physiol Zool. 1998 Jul-Aug;71(4):449-57. (PMID: 9678505)
J Zoo Wildl Med. 2006 Sep;37(3):262-75. (PMID: 17319124)
J Environ Manage. 2010 Aug;91(8):1766-77. (PMID: 20413210)
Nature. 2005 Jun 9;435(7043):755-6. (PMID: 15944690) - Publication Date: Date Created: 20150722 Date Completed: 20160502 Latest Revision: 20240326
- Publication Date: 20240326
- Accession Number: PMC4511414
- Accession Number: 10.1371/journal.pone.0128579
- Accession Number: 26197396
- Source:
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