Proposal of a non-lethal visual census method to estimate freshwater stingray abundance
There is not a current method to estimate South American freshwater stingray’s abundance. Therefore we designed a census method and tested it in the field. It consists of making nocturnal surveys by boat in large rivers (>25m width) and floodplain lagoons of varying sizes, along transects of 100m...
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| Format: | Article |
| Language: | English |
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Pontificia Universidad Javeriana
2016-01-01
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| Series: | Universitas Scientiarum |
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| Online Access: | http://revistas.javeriana.edu.co/index.php/scientarium/article/view/15364 |
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| author | Mónica Andrea Morales-Betancourt Carlos Andrés Lasso-Alcalá |
| author_facet | Mónica Andrea Morales-Betancourt Carlos Andrés Lasso-Alcalá |
| author_sort | Mónica Andrea Morales-Betancourt |
| collection | DOAJ |
| description | There is not a current method to estimate South American freshwater stingray’s abundance. Therefore we designed a census method and tested it in the field. It consists of making nocturnal surveys by boat in large rivers (>25m width) and floodplain lagoons of varying sizes, along transects of 100m x 10m (1000 m2). We applied this method in the Tomo River, a tributary of the Orinoco River in Colombia. 110 transects were surveyed in 200 runs. A total of 149 rays of four species were recorded: Potamotrygon motoro, Potamotrygon orbignyi, Potamotrygon schroederi and Paratrygon aiereba. P. motoro was the most abundant with a density of 0.31 individuals /1000 m2 (SD=0.5). This method gave optimal results when applied to habitats with high transparency and shallow depth (< 1m) since it permitted the identification of both adults and juveniles present. |
| format | Article |
| id | doaj-art-963362cb1c804537a7d1e60b6e062a61 |
| institution | OA Journals |
| issn | 0122-7483 2027-1352 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Pontificia Universidad Javeriana |
| record_format | Article |
| series | Universitas Scientiarum |
| spelling | doaj-art-963362cb1c804537a7d1e60b6e062a612025-08-20T02:10:13ZengPontificia Universidad JaverianaUniversitas Scientiarum0122-74832027-13522016-01-01211233210.11144/Javeriana.SC21-1.poanProposal of a non-lethal visual census method to estimate freshwater stingray abundanceMónica Andrea Morales-Betancourt0Carlos Andrés Lasso-Alcalá1Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Street 28a #15-09 Bogotá, Colombia Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Street 28a #15-09 Bogotá, Colombia There is not a current method to estimate South American freshwater stingray’s abundance. Therefore we designed a census method and tested it in the field. It consists of making nocturnal surveys by boat in large rivers (>25m width) and floodplain lagoons of varying sizes, along transects of 100m x 10m (1000 m2). We applied this method in the Tomo River, a tributary of the Orinoco River in Colombia. 110 transects were surveyed in 200 runs. A total of 149 rays of four species were recorded: Potamotrygon motoro, Potamotrygon orbignyi, Potamotrygon schroederi and Paratrygon aiereba. P. motoro was the most abundant with a density of 0.31 individuals /1000 m2 (SD=0.5). This method gave optimal results when applied to habitats with high transparency and shallow depth (< 1m) since it permitted the identification of both adults and juveniles present.http://revistas.javeriana.edu.co/index.php/scientarium/article/view/15364densityPotamotrygonidaeOrinoco river basinColombia |
| spellingShingle | Mónica Andrea Morales-Betancourt Carlos Andrés Lasso-Alcalá Proposal of a non-lethal visual census method to estimate freshwater stingray abundance Universitas Scientiarum density Potamotrygonidae Orinoco river basin Colombia |
| title | Proposal of a non-lethal visual census method to estimate freshwater stingray abundance |
| title_full | Proposal of a non-lethal visual census method to estimate freshwater stingray abundance |
| title_fullStr | Proposal of a non-lethal visual census method to estimate freshwater stingray abundance |
| title_full_unstemmed | Proposal of a non-lethal visual census method to estimate freshwater stingray abundance |
| title_short | Proposal of a non-lethal visual census method to estimate freshwater stingray abundance |
| title_sort | proposal of a non lethal visual census method to estimate freshwater stingray abundance |
| topic | density Potamotrygonidae Orinoco river basin Colombia |
| url | http://revistas.javeriana.edu.co/index.php/scientarium/article/view/15364 |
| work_keys_str_mv | AT monicaandreamoralesbetancourt proposalofanonlethalvisualcensusmethodtoestimatefreshwaterstingrayabundance AT carlosandreslassoalcala proposalofanonlethalvisualcensusmethodtoestimatefreshwaterstingrayabundance |