Características del hábitat del Manatí antillano (Trichechus manatus manatus) en sistemas fluvio-lagunares del sur del Golfo de México

Jiménez-Domínguez, Darwin; Olivera‐Gómez, León David

doi:10.12933/therya-14-205

Cited by 11 publications

(7 citation statements)

References 10 publications

(23 reference statements)

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“…Tabasco was also important for oil and gas extraction since the 1940s, both along the shore and inland at areas associated with wetland productivity, which caused heavy changes in land use and in the hydrological drainage network. (Colmenero & Hoz-Zavala, 1986;Jime´nez-Dom ınguez & Olivera-G omez, 2014). This region is thought to host the largest manatee population in Mexico (Marsh, O'Shea, & Reynolds III, 2011).…”

Section: Discussionmentioning

confidence: 99%

Genetic Diversity and Structure From Antillean Manatee (Trichechus manatus manatus) in the Southern Gulf of México: Comparison Between Connected and Isolated Populations

Gómez-Carrasco

Lesher-Gordillo

Olivera‐Gómez

et al. 2018

Tropical Conservation Science

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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 ¼ 38, including 19 from IL), Veracruz (n ¼ 3), Campeche (n ¼ 2), and Chiapas (n ¼ 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 ¼ 2) were identified by STRUCTURE. The analysis of both a priori populations (IL and OP) indicate that the global values of F ST and R ST (F ST ¼0.049, R ST ¼0.077) were significant. The H E for IL was 0.38 AE 0.03 and for OP was 0.49 AE 0.01. The average number of alleles N A for IL was 2.21 AE 0.09 and for OP was 2.32 AE 0.09. The overall inbreeding coefficient was F IS ¼À0.013 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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Section: Discussionmentioning

confidence: 99%

Genetic Diversity and Structure From Antillean Manatee (Trichechus manatus manatus) in the Southern Gulf of México: Comparison Between Connected and Isolated Populations

Gómez-Carrasco

Lesher-Gordillo

Olivera‐Gómez

et al. 2018

Tropical Conservation Science

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“…Some years later, using data from interviews, Colmenero-Rolón (1984) found that the Grijalva-Usumacinta Basin in the state of Tabasco was the most important manatee habitat area in Mexico. This could be true, but the region has not been systematically studied yet (Álvarez-Flores et al 1988, UNEP 2010, Jiménez-Domínguez and Olivera-Gómez 2014. The Regional Management Plan for the West Indian Manatee (Trichechus manatus) reported a minimum population size of 1,000-2,000 manatees, based on best available data (UNEP 2010), and the majority of these individuals might be found in the Grijalva-Usumacinta hydrological basin in Tabasco (SEMARNAT/CONANP 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Manatees frequently inhabit fluvial-lagoon systems throughout the world, such as those in Venezuela and Colombia (Castelblanco-Martínez et al 2009, Rivas-Rodríguez et al 2012, Jaramillo-Villa 2015, Brazil (Arraut et al 2010), and Mexico (Colmenero-Rolón and Hoz-Zavala 1986, Rodas-Trejo et al 2008, Jiménez-Domínguez and Olivera-Gómez 2014. Turbid waters in these ecosystems have historically curtailed manatee studies (González-Socoloske and Olivera-Gómez 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The Usumacinta River has many small rivers systems with interconnecting streams and lagoons where manatees have been frequently sighted. One of these systems, the San Pedro River system, is known for the high frequency of manatee sightings in it (Jiménez-Domínguez and Olivera-Gómez 2014). This study aimed to estimate the population density of manatees in the San Pedro River and associated streams using SSS, and to determine how this density varies with changes in water level.…”

Section: Introductionmentioning

confidence: 99%

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First field-based estimate of Antillean manatee abundance in the San Pedro River system suggests large errors in current estimates for Mexico

et al. 2017

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Fluvial-lagoon systems like the San Pedro River, a tributary of the Usumacinta River, are important habitats for Antillean manatees. These systems are characterized by complex watercourses that contain water with high turbidity levels, which have historically limited manatee studies in hydrological basins on the eastern coast of Mexico. This study aimed to estimate manatee density in the San Pedro River system and to determine how this density varies with changes in water level. Density was estimated using counts detected by side-scan sonar (SSS). Two monthly navigation sessions were conducted from January to June 2016. Each session consisted of running 3 consecutive boat surveys along a 23-km-long transect at a speed of 10 km/h. Manatees were detected with a Humminbird SSS unit. A total of 471 manatees were detected, of which 46 (10%) were calves and 425 (90%) adults. Four different calves were identified. Mean density was 21.7 manatees per square kilometer, fluctuating between 3.7 and 43.3 manatees per square kilometer. Changes in manatee density were attributable to variations in water level, which allow or restrict manatee access to the different water bodies that make up the San Pedro River system. We estimated that 28 manatees were present in the study area. Manatee densities were surprisingly low. It is thus urgent to continue monitoring studies using SSS and obtain an updated estimation of manatee population size in the hydrological basins on the eastern coast of Mexico, which is considered to be the most important population in the country.

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“…One of the largest manatee populations in Mexico inhabits these shallow riverine environments (Marsh et al 2012), but quantitative assessments have not been made in this area, only in Quintana Roo (Morales-Vela et al 2000). All the information we have about manatees in the Gulf of Mexico comes from interviews, strandings, and opportunistic sightings of this species (Colmenero andHoz 1986, Arriaga andContreras 1993), or from recent studies in particular areas (Pablo-Rodríguez andOlivera-Gómez 2012, Jiménez-Domínguez andOlivera-Gómez 2014).…”

Section: Introductionmentioning

confidence: 99%

Relative abundance of Antillean manatees in the Pantanos de Centla Biosphere Reserve in the coastal plain of Tabasco, Mexico

et al. 2016

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Abundance estimates for the Antillean manatee, Trichechus manatus manatus, in the southern Gulf of Mexico are based on interviews, mortality reports, and opportunistic sightings. The lack of quantitative data is explained by the complexity of hard-to-access fluviallake systems, low water transparency, and the elusive behavior of manatees. Side-scan sonar is a promissory tool to detect and count manatees in fluvial systems. The Pantanos de Centla Biosphere Reserve (PCBR), in the coastal plain of Tabasco (Mexico), could play a key role in the regional conservation of manatees, but it is under constant pressure, especially from the oil and gas industry, and it is important to generate quantitative data for this area. The objective of this study was to quantify the relative abundance of manatees at 4 selected sites within PCBR and at 2 reference sites outside the reserve using side-scan sonar, as a basis for the long-term monitoring of the species and to determine the importance of the reserve for regional manatee conservation. We conducted 5 to 7 boat surveys on 10-km line transects along selected water courses and recorded 63 manatee sightings. Manatees occurred at all sampling sites and abundance increased upriver. The site with the highest mean abundance (5.17 ± 1.9 manatees/10 km) was located at the southeastern end of PCBR. There was statistical difference among sites. The southeastern portion of Tabasco is a key region for manatee conservation and management in Mexico. PCBR is a key regional feature but it is necessary to define protection strategies within and beyond its southern limits.

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Características del hábitat del Manatí antillano (Trichechus manatus manatus) en sistemas fluvio-lagunares del sur del Golfo de México

Cited by 11 publications

References 10 publications

Genetic Diversity and Structure From Antillean Manatee (Trichechus manatus manatus) in the Southern Gulf of México: Comparison Between Connected and Isolated Populations

Genetic Diversity and Structure From Antillean Manatee (Trichechus manatus manatus) in the Southern Gulf of México: Comparison Between Connected and Isolated Populations

First field-based estimate of Antillean manatee abundance in the San Pedro River system suggests large errors in current estimates for Mexico

Relative abundance of Antillean manatees in the Pantanos de Centla Biosphere Reserve in the coastal plain of Tabasco, Mexico

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