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Morales-Vela, Benjamín; Olivera-Gómez, León David
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1991 |
Mamíferos acuáticos. In: T. Camarena-Luhrs & S. Salazar-Vallejo (eds.), Estudios ecológicos preliminares de la zona sur de Quintana Roo.
Chetumal (Mexico), Centro de Investigaciones de Quintana Roo: 172-185. Figs. 27-29. Sept. 1991.
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Morales-Vela, Benjamín; Olivera-Gómez, León David
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1997 |
Distribución del manatí (Trichechus manatus) en la costa norte y centro-norte del Estado de Quintana Roo, México.
An. Inst. Biol. Univ. Nac. Autón. México, Ser. Zool. 68(1): 153-164. 1 tab. 3 figs.
–Engl. summ.
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Olivera-Gómez, León David; Mellink, E.
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2002 |
Spatial and temporal variation in counts of the Antillean manatee (Trichechus m. manatus) during distribution surveys at Bahia de Chetumal, Mexico.
Aquat. Mamms. 28(3): 285-293.
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Olivera-Gómez, Léon David; Mellink, E.
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2005 |
Distribution of the Antillean manatee (Trichechus manatus) as a function of habitat characteristics, in Bahía de Chetumal, Mexico.
Biol. Conserv. 121(1): 127-133.
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Moraes-Arraut, Eduardo; Ortega-Argueta, Alejandro; Olivera-Gómez, Leon D.; Sheppard, James K.
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2012 |
Delineating and assessing habitats for sirenians. Chap. 18 in: E. M. Hines et al. (eds.), Sirenian conservation: issues and strategies in developing countries (q.v.).
Gainesville, University Press of Florida (xiv + 326): 157-167. 3 tabs.
–Includes box essay by Moraes-Arraut & Miriam Marmontel (p. 164, "Case study: Seasonal migrations by Amazonian manatees").
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Olivera-Gómez, Léon David; Mellink, E.
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2013 |
Aquatic macrophytes within a mesohaline bay, sanctuary for manatees (Trichechus manatus), on the Caribbean coast of Mexico.
Southwestern Naturalist 58(2): 216-222.
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Aragon-Martinez, Arianna; Olivera-Gomez, Leon David; Jimenez-Dominguez, Darwin
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2014 |
Seasonal prevalence of antibodies to Leptospira interrogans in Antillean manatees from a landlocked lake in Tabasco, Mexico.
Jour. Wildlife Diseases 50(3): 505-511. DOI: 10.7589/2013-05-102. July 2014.
–ABSTRACT: Factors that alter the dynamics of ecologic systems can influence transmission of infectious diseases and may lead to decreases in natural populations. Leptospirosis is a cosmopolitan disease of zoonotic importance that affects most mammals. At the southern Gulf of Mexico, Antillean manatees (Trichechus manatus manatus) inhabit highly variable environments, with extended floods during the rainy season and drought conditions during the dry season that affect food availability and the thermal environment for manatees. We tested for changes in prevalence and titers of antibodies to 12 serovars of Leptospira interrogans, in manatees between dry and rainy seasons. We determined titers for L. interrogans through microscopic agglutination tests (MAT) from 10 manatees, six during the dry season (DS), and six during the rainy season (RS) in Laguna de las Ilusiones, a landlocked lake hosting a population of about 20 manatees. All individuals were antibody positive (titers >= 100) to at least one serovar. The serovars bataviae, bratislava, canicola, and icterohaemorrhagiae had overall prevalences >= 50% bataviae, bratislava, and canicola had prevalences during both seasons. Serovars icterohaemorrhagiae and pyrogenes had prevalences >= 50% during DS and pomona, tarassovi, wolfii, and autumnalis during RS. Significant differences in prevalence between seasons were found for pomona, tarassovi, and autumnalis Titers of tarassovi, wolfii, autumnalis, and bataviae were significantly higher during RS. There was a high prevalence of L. interrogans during the RS independent of high availability of plant foods, coinciding with the epizootiology of the bacteria that are endemic to tropical regions. Another factor possibly influencing prevalence is high anthropogenic pressure at the lake, causing an increase in potential sources of infection. Because of possible cross-reaction in MAT, further research is needed on the molecular discrimination of serovars in animals in the lake.
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Jimenez-Dominguez, Darwin; Olivera-Gomez, Leon David
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2014 |
Caracteristicas del habitat del manati antillano (Trichechus manatus manatus) en sistemas fluviolagunares del sur del Golfo de Mexico. (Habitat characteristics of Antillean manatee (Trichechus manatus manatus) in fluvial lake systems of southern Gulf of Mexico).
Therya (Associación Mexicana de Mastozoología) 5(2): 601-614. 2 tabs. 1 fig. DOI: 10.12933/therya-14-205. Aug. 2014.
–ABSTRACT: Studying a species' habitat is a tool for researchers and stakeholders to find key ecological characteristics to be used in management actions. Freshwater systems comprise most of the habitat of Antillean manatees, however the habitat features of these systems are still poorly understood. The objective of this study was to explore habitat variables most related to the use of freshwater systems by the Antillean manatees in the lower basin of the Usumacinta River.
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Gonzalez-Socoloske, Daniel; Olivera-Gómez, Leon D.; Reid, James P.; Espinoza-Marin, Carlos; Ruiz, Kherson E.; Glander, Kenneth E
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2015 |
First successful capture and satellite tracking of a West Indian manatee (Trichechus manatus) in Panama: feasibility of capture and telemetry techniques.
Latin American Journal of Aquatic Mammals 10(1): 52-57. 1 table. 1 figure. DOI:10.5597/lajam00194. Sep. 16, 2015.
–ABSTRACT- It is currently unknown how important the Central American countries south of Belize are as a link between manatee populations in the north (Belize and Mexico) and populations in South America. Therefore, apart from knowing where manatees are found, it is important to understand how manatees are using these habitats and if they are moving between countries or distinct population centers. Here we report the results of a multi-national and multiinstitutional collaboration resulting in the first successful capture and satellite tracking of a West Indian manatee in southern Central America.
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Romero-Calderon, Ana G.; Morales-Vela, Benjamin; Rosiles-Martinez, Rene; Olivera-Gomez, Leon David; Delgado-Estrella, Alberto
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2016 |
Metals in bone tissue of Antillean manatees from the Gulf of Mexico and Chetumal Bay, Mexico.
Bulletin of Environmental Contamination & Toxicology 96(1): 9-14. 2 tabs. 1 fig. DOI: 10.1007/s00128-015-1674-6. Jan. 2016.
–ABSTRACT: Concentrations of seven metals (As, Cd, Cr, Cu, Pb, Ni, and Zn) were analyzed in 33 bone tissue samples of Antillean manatees (Trichechus manatus manatus) found dead in lagoons and rivers of Tabasco and Campeche in the Gulf of Mexico and Chetumal Bay in the Caribbean region. The concentrations of Cr, Cu, Pb, and Zn were significantly different between regions, with greater levels found in the Gulf of Mexico group than in the Mexican Caribbean group (p < 0.05). Pb concentrations differed significantly between adults and calves. No differences were observed between sexes. Metal concentrations detected in the manatee bones were higher than most of those reported for bones in other marine mammals around the world. Future studies are necessary to establish whether the metal concentrations represent a risk to the health of the species.
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Ramírez-Jiménez, Helda Herenia; Olivera-Gómez, León David; Cueva, Horacio de la
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2017 |
Habitat use by the Antillean manatee (Trichechus manatus)during an extreme dry season in an urban lake in Tabasco, Mexico.
Therya 8(1): 19-26. 2 tabs. 5 figs. doi: 10.12933/therya-17-411 ISSN 2007-3364. Publ. online Jan. 17, 2017.
–Spanish summ.
ABSTRACT: There are three important manatee areas in Mexico: the coasts of the State of Quintana Roo; the freshwater systems within the lower basin of the Grijalva-Usumacinta rivers, which host the largest manatee population; and the rivers of central and southern Veracruz. The Antillean manatee (Trichechus manatus manatus) is a threatened species throughout its range. In the Grijalva-Usumacinta region, two of the current threats to manatees are the effects of extremely dry periods and geographical isolation. The objective of the study was to evaluate the behavior and habitat use of the landlocked manatee population inhabiting Laguna de las Ilusiones, Villahermosa, Tabasco, under fortuitous dry conditions, to conduct an evaluation and implement a monitoring plan for landlocked manatees. In this work, we gathered information on the differential use of the lake, and on whether this use is related to the known habitat characteristics that govern the distribution of manatees. Using VHF tags, we followed the activities of four manatees (three females and one male) to characterize and quantify four behaviors, namely feeding, resting, exploring, and traveling, between April and August 2007. We built Kernel polygons for the 25, 50, 75, and 95% of the utilization distribution (UD). We modeled the habitat using a binary logistic regression and explored the association between the tagged manatees using Cole's simple coefficient of association. Manatees were concentrated mainly to the northeast of the lake. The best feeding logistic model included depth, distance to the shore, tree cover, and wind speed (Table 1), and yielded differences between periods (H = 9.85,P = 0.007, Figure 5). The logistic models fit poorly for resting, exploring, and traveling (Table 1). The resting model included distance to the the shore, tree cover, and company, and yielded differences between periods (H = 6.68, P = 0.035). Traveling included depth, cloud cover, and human activities, and yielded differences between periods (H = 7.55, P = 0.023). Exploration included depth and company, and did not differ between periods (H = 1.55, P = 0.461). We had the opportunity to assess these behaviors under dry conditions, and our findings are not necessarily applicable to the rainy season. The northern portion of the lake is an embayment connected to the central zone by a 50 m-wide shallow channel, which limited the movement of manatees. Higher food availability and stress avoidance might make manatees choose this area. Feeding was better modeled by the habitat characteristics included in the study. Feeding increased slightly in the evenings. Exploring and traveling were the behavior types observed most frequently in manatees; maybe they were moving across food patches or known areas. Manatee social encounters are reported as short-term and sporadic, but in this study manatees were observed in groups during nearly half of the observation time. When the availability of grasses and aquatic plants is low, manatees increase their consumption of other food items like mango fruits. Based on the findings reported here and under dry conditions, habitat enrichment will be helpful for this landlocked manatee population and those in other areas where seasonal contrasts are observed.
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Gomez-Carrasco, Guadalupe; Lesher-Gordillo, Julia Maria; Olivera-Gomez, Leon David; Bonde, Robert K.; Arriaga-Weiss, Stefan L.; Hernandez-Martinez, Raymundo; Castañón-Nájera, Guillermo; Jimenez-Dominguez, Darwin; Romo-Lopez, Armando; Delgado-Estrella. Alberto
(detail)
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2018 |
Genetic diversity and structure from Antillean manatee (Trichechus manatus manatus) in the southern Gulf of México: comparison between connected and isolated populations.
Tropical Conservation Science 11: 1-10. doi:10.1177/1940082918795560. 2 tabs. 2 figs. Jan. 1, 2019; publ. online Aug. 31, 2018.
–ABSTRACT: Antillean manatees (Trichechus manatus manatus), a subspecies of the West Indian manatee, is listed as endangered species in the Red List of Threatened Species of the International Union for Conservation of Nature. The aims of this research were to survey on the possible regional genetic structure in the southern Gulf of Mexico and to compare genetic status of a landlocked population in Laguna de las Ilusiones (IL) with individuals from localities with no barriers to displacement and breed (open population [OP]). We analyzed 45 manatee skin samples collected from different locations in Tabasco (n?=?38, including 19 from IL), Veracruz (n?=?3), Campeche (n?=?2), and Chiapas (n?=?2). The genomic DNA was isolated and PCR amplifications were performed for each sample using 28 microsatellite loci, previously designed for West Indian manatees and described as polymorphic for this species. Two clusters (k?=?2) were identified by STRUCTURE. The analysis of both a priori populations (IL and OP) indicate that the global values of FST and RST (FST=0.049, RST=0.077) were significant. The HE for IL was 0.38?±?0.03 and for OP was 0.49?±?0.01. The average number of alleles NA for IL was 2.21?±?0.09 and for OP was 2.32?±?0.09. The overall inbreeding coefficient was FIS=?0.013 for analyzed populations. Genetic diversity was low. The IL population had slightly lower genetic diversity compared with OP, which could be explained by isolation of that small group, so conservation plans for IL should be considered as priority.
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Robles-Herrejón, Juan Carlos; Morales-Vela, Benjamín; Ortega-Argueta, Alejandro; Pozo, Carmen; Olivera-Gómez, León David
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2020 |
Management effectiveness in marine protected areas for conservation of Antillean manatees on the eastern coast of the Yucatan Peninsula, Mexico.
Aquatic Conservation: Marine & Freshwater Ecosystems 30: 1182-1193. https://doi.org/10.1002/aqc.3323 May 7, 2020.
–ABSTRACT: 1. This study evaluated management effectiveness in three marine protected areas (MPAs) for conservation of the Antillean manatee (Trichechus manatus manatus Linnaeus, 1758), located on the eastern coast of the Yucatan Peninsula, Mexico. The MPAs evaluated were the Yum-Balam Flora and Fauna Reserve, Sian Ka'an Biosphere Reserve, and Chetumal Bay Manatee Sanctuary. The extent of the traditional, popular, and scientific manatee knowledge and research were assessed, as well as the prescribed conservation management actions, relevant stakeholders, and the degree of inclusion of manatee species in the management schemes of these MPAs.
2. Four general criteria, 12 specific criteria, and 62 indicators were developed. In total, 199 interviews were completed in seven communities of the MPAs in order to determine the perception of the social, economic, and conservation impacts of the manatee and its management.
3. Although the evaluated MPAs were not wholly comparable among themselves due to their different management categories and schemes, administration, socio-economic context, and the dynamics and conflicts encountered, a comparison was conducted using standardized criteria and a categorical scale in order to evaluate the level of effectiveness of each MPA.
4. The MPA with the highest management effectiveness in manatee conservation was found to be the Chetumal Bay, with an effectiveness classed as good (71%), followed by Sian Ka'an with intermediate effectiveness (53%) and Yum?Balam, also with intermediate effectiveness (43%).
5. The relationships between the key stakeholders of the three MPAs and economic activities such as fishing and tourism are the factors that most influence the effectiveness of management for manatee conservation.
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Bibliography and Index of the Sirenia and Desmostylia 