Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses

Jiménez, Ignacio

doi:10.1016/j.biocon.2005.04.012

Cited by 27 publications

(35 citation statements)

References 14 publications

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“…Algunas de las características más importantes del hábitat del manatí en sistemas de agua dulce, son la presencia de cursos de agua interconectados, con abundante vegetación acuática, aguas tropicales y transparentes y alta cobertura arbórea en las riberas, notándose una preferencia hacia el uso de lagunas amplias (Bermúdez et al 2004;Jiménez 2005). Jiménez (2005) propuso un modelo general de las características del hábitat para cursos de agua dulce en Centroamérica; sin embargo, esta área no es representativa de la gran complejidad de los sistemas tropicales de agua dulce donde se encuentra al manatí.…”

Section: Introductionunclassified

“…Jiménez (2005) propuso un modelo general de las características del hábitat para cursos de agua dulce en Centroamérica; sin embargo, esta área no es representativa de la gran complejidad de los sistemas tropicales de agua dulce donde se encuentra al manatí.…”

Section: Introductionunclassified

“…Se consideraron cuatro tipos de variables ambientales: biológicas, físicas, antrópicas y de paisaje, reconocidas como determinantes en el uso del hábitat del manatí Antillano (Axis- Arroyo et al 1998;Bermúdez et al 2004;Jiménez 2005; Olivera-Gómez y Mellink 2005). Como variable biológica se consideró: la cobertura de vegetación, relacionada con la disponibilidad de alimento.…”

Section: Introductionunclassified

“…La transparencia del agua (Trs) a 10 m de la orilla con ayuda del disco de Secchi y la velocidad de la corriente (VC) mediante una tarjeta de deriva, asignando los valores obtenidos dentro de cinco categorías: La variable antrópica que se consideró fue el tráfico de embarcaciones (Trf), siguiendo el método utilizado por Jiménez (2005) mediante entrevistas a pobladores locales y a observaciones en campo, clasificándolo de acuerdo a su intensidad en el sitio en alguna de las siguientes categorías: [1] tráfico alto: rutas habituales de transporte, [2] tráfico medio: rutas marginales y áreas de pesca habitual, [3] tráfico bajo: áreas inaccesibles a las embarcaciones con motor o raramente visitadas. El tráfico de embarcaciones varía según la época de año, por lo que se registró en cada muestreo para asociarlo con las observaciones de manatíes.…”

Section: Introductionunclassified

“…Así mismo, se consideró como registro indirecto el reporte de avistamientos de habitantes de la región que desarrollan alguna actividad relacionada con los cuerpos de agua que fueran confirmados por al menos dos personas de manera independiente (Bermúdez et al 2004;Jiménez 2005).…”

Section: Introductionunclassified

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

Jiménez-Domínguez

Olivera‐Gómez

2014

Therya

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Section: Introductionunclassified

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

Jiménez-Domínguez

Olivera‐Gómez

2014

Therya

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Occurrence patterns of African manatees, conflicts with humans, and local perception in the Southern Korup Area, Cameroon

Mayaka

Koh‐Dimbot

Keith-Diagne

2019

Aquatic Conservation

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The African manatee has been poorly studied throughout its range and is heavily hunted. This study aimed at discerning patterns in manatee sightings and emerging conflicts with humans, as well as the local perception of manatees, outside the southern periphery of Korup National Park, Cameroon. The study investigated whether patterns in manatee sightings and manatee‐related conflicts differ between aquatic systems in southern Korup, and which demographic variables determine perceptions of the manatee in the study area. For this purpose, the study used a three‐stage stratified random sampling design with a structured questionnaire to survey 101 local fishers. The reported patterns of manatee sightings and manatee‐related conflicts were as follows: in the Nyangorobe River during the wet season only, where crop raiding and net destruction by manatees were reported; in the Ndian River and the mangrove estuary only during the dry season, where fish theft and net damage were reported; and in the Moko River during both seasons, where crop raiding, fish theft, and net destruction were reported. Reducing these conflicts is likely to increase local support for the conservation of manatees, because fishermen kill them in response to net destruction and fish loss. Most reported sightings were at waterway intersections and river bends, suggesting that waterway connectivity is important to manatees for dispersal, foraging, and escape from danger. The log‐odds probability of negative perception decreased significantly with awareness of manatee protected status but increased with age and primary or higher education level. These findings have implications for community outreach focused on raising awareness of the importance of manatee conservation by schoolchildren and the public.

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Effects of freshwater limitation on distribution patterns and habitat use of the West Indian manatee, Trichechus manatus, in the northern Brazilian coast

Favero

Favero²,

Choi‐Lima³

et al. 2020

Aquatic Conservation

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The West Indian manatee (Trichechus manatus) is a Vulnerable species threatened by habitat loss in the coast of north‐eastern Brazil. This study investigates how the distribution and habitat use of the West Indian manatee is influenced by resource availability in a scenario of freshwater limitation. Land‐based and boat surveys were conducted to record manatee sightings and habitat use, in a total of 206 hours of observation. Manatee abundance was significantly influenced by freshwater availability, with greater abundances occurring close to freshwater sources. Food availability and the variation in freshwater availability between seasons were also important to determine their distribution. For the 47 manatees sighted, 39 were recorded during the rainy season and eight during the dry season. Habitat use was influenced by freshwater sources and manatees spent more time (average coefficient of area use = 24.96%) in areas with greater availability of fresh water. Under conditions of freshwater limitation, manatees were more abundant and spent more time closer to fresh water than to food sources; as a result, animals' distribution varied between seasons. The results found here can help to determine conservation strategies for the region with the highest population density and genetic variability of West Indian manatees in Brazil.

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Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses

Cited by 27 publications

References 14 publications

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

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

Occurrence patterns of African manatees, conflicts with humans, and local perception in the Southern Korup Area, Cameroon

Effects of freshwater limitation on distribution patterns and habitat use of the West Indian manatee, Trichechus manatus, in the northern Brazilian coast

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