Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses
Logistic regressions were used to study the relationship between habitat variables and the use of tropical watercourses by the West Indian manatee Trichechus manatus at Northeastern Costa Rica and Southern Nicaragua. Presence of manatees in water courses was assessed through direct and reported sig...
| Autor Principal: | Jiménez, Ignacio |
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| Formato: | Artículo |
| Idioma: | Inglés |
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Universidad Nacional, Costa Rica.
2022
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| Acceso en línea: |
http://hdl.handle.net/11056/23112 |
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RepoUNACR23112 |
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RepoUNACR231122024-05-15T20:43:46Z Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses Jiménez, Ignacio HABITAT SELECTION INDIRECT MELHODS FOR DISTRIBUTION ASSESSMENT PREDICTIVE MODELS TRICHECHUS MANATUS WEST INDIAN MANATEE SELECCIÓN DE HÁBITAT MÉTODOS INDIRECTOS PARA LA EVALUACIÓN DE LA DISTRIBUCIÓN MODELOS PREDICTIVOS TRICHECO MANATUS MANATI DE LAS INDIAS OCCIDENTALES Logistic regressions were used to study the relationship between habitat variables and the use of tropical watercourses by the West Indian manatee Trichechus manatus at Northeastern Costa Rica and Southern Nicaragua. Presence of manatees in water courses was assessed through direct and reported sightings of individuals and feeding signs on aquatic vegetation. Indirect methods provided good approximations to the actual distribution that could not have been achieved through direct observations or aerial surveys. Best multivariate models showed that manatees were most present in watercourses that presented abundant aquatic vege tation, warm, and clear waters, high forest cover, and are wider than those where the species is absent. Although habitat variables that explain habitat use of manatees differed for the two sectors found within the study area, manatees preferred lagoons to other watercourses in both areas. These findings point to forest clearing on the shores as a threat for manatee conservation. Habitat vari ables are excellent predictors of manatee presence, and predictive models as those developed in this study can help assess potential distribution of manatees in areas where this information is lacking as well as to assist identify potential reintroduction areas. Se utilizaron regresiones logísticas para estudiar la relación entre las variables de hábitat y el uso de los cursos de agua tropicales por parte de los Manatí antillano Trichechus manatus en el noreste de Costa Rica y el sur de Nicaragua. La presencia de manatíes en cursos de agua se evaluó mediante avistamientos directos e informados de individuos y señales de alimentación en la vegetación acuática. Métodos indirectos proporcionó buenas aproximaciones a la distribución real que no podrían haberse logrado mediante observaciones directas o aéreas. encuestas. Los mejores modelos multivariados mostraron que los manatíes estaban más presentes en cursos de agua que presentaban abundante vegetación acuática, aguas cálidas y claras, alta cubierta forestal y eran más anchos que aquellos donde la especie estaba ausente. Aunque las variables de hábitat que explican el uso del hábitat de los manatíes diferían para los dos sectores encontrados dentro del área de estudio, los manatíes preferían las lagunas a otros cursos de agua en ambas zonas. Estos hallazgos apuntan a la tala de bosques en las costas como una amenaza para la conservación del manatí. Las variables de hábitat son excelentes predictores de la presencia de manatíes, y los modelos predictivos como los desarrollados en este estudio pueden ayudar a evaluar posibles distribución de manatíes en áreas donde falta esta información, así como para ayudar a identificar áreas potenciales de reintroducción. Universidad Nacional, Costa Rica. Instituto Internacional en Conservación y Manejo de Vida Silvestre 2022-05-25T12:32:28Z 2022-05-25T12:32:28Z 2005-05-31 http://purl.org/coar/resource_type/c_6501 00063207 http://hdl.handle.net/11056/23112 10.1016/j.biocon.2005.04.012 eng Acceso abierto http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Universidad Nacional, Costa Rica. Biological Conservation vol. 125 no.4 491-503 2005 |
| institution |
Universidad Nacional de Costa Rica |
| collection |
Repositorio UNA-Costa Rica |
| language |
Inglés |
| topic |
HABITAT SELECTION INDIRECT MELHODS FOR DISTRIBUTION ASSESSMENT PREDICTIVE MODELS TRICHECHUS MANATUS WEST INDIAN MANATEE SELECCIÓN DE HÁBITAT MÉTODOS INDIRECTOS PARA LA EVALUACIÓN DE LA DISTRIBUCIÓN MODELOS PREDICTIVOS TRICHECO MANATUS MANATI DE LAS INDIAS OCCIDENTALES |
| spellingShingle |
HABITAT SELECTION INDIRECT MELHODS FOR DISTRIBUTION ASSESSMENT PREDICTIVE MODELS TRICHECHUS MANATUS WEST INDIAN MANATEE SELECCIÓN DE HÁBITAT MÉTODOS INDIRECTOS PARA LA EVALUACIÓN DE LA DISTRIBUCIÓN MODELOS PREDICTIVOS TRICHECO MANATUS MANATI DE LAS INDIAS OCCIDENTALES Jiménez, Ignacio Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| description |
Logistic regressions were used to study the relationship between habitat variables and the use of tropical watercourses by the
West Indian manatee Trichechus manatus at Northeastern Costa Rica and Southern Nicaragua. Presence of manatees in water courses was assessed through direct and reported sightings of individuals and feeding signs on aquatic vegetation. Indirect methods
provided good approximations to the actual distribution that could not have been achieved through direct observations or aerial
surveys. Best multivariate models showed that manatees were most present in watercourses that presented abundant aquatic vege tation, warm, and clear waters, high forest cover, and are wider than those where the species is absent. Although habitat variables
that explain habitat use of manatees differed for the two sectors found within the study area, manatees preferred lagoons to other
watercourses in both areas. These findings point to forest clearing on the shores as a threat for manatee conservation. Habitat vari ables are excellent predictors of manatee presence, and predictive models as those developed in this study can help assess potential
distribution of manatees in areas where this information is lacking as well as to assist identify potential reintroduction areas. |
| format |
Artículo |
| author |
Jiménez, Ignacio |
| author_sort |
Jiménez, Ignacio |
| title |
Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| title_short |
Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| title_full |
Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| title_fullStr |
Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| title_full_unstemmed |
Development of predictive models to explain the distribution of the West Indian manatee Trichechus manatus in tropical watercourses |
| title_sort |
development of predictive models to explain the distribution of the west indian manatee trichechus manatus in tropical watercourses |
| publisher |
Universidad Nacional, Costa Rica. |
| publishDate |
2022 |
| url |
http://hdl.handle.net/11056/23112 |
| _version_ |
1799263307733925888 |
| score |
12.239364 |