Estudios adicionales sobre los Crocodylia y Testudinata del Alto Caquetá y Río Caguán
Additional studies on reproduction of the Spectacled Caiman (Caiman sclerops), two Side-neck Turtles (Podocnemis expansa, Podocnemis anifilis) and one Snake-neck Turtle (Phrynops geoffroanus tuberosus) have been carried out in the Upper Caquetá and its tributary, río Caguán, which belong to the Colombian Amazon Basin. Moreover, it had been found, that the Matamatá (Chelus fimbriatus] belongs to the native faunistic elements of the Upper Caquetá, and was not introduced from other rivers or its lower course, as formerly suspected. The main results are the following: 1) Caiman sclerops. Eggs. Measurements: From 67.0 : 41.5 mm. to 73.5 : 41.0 mm, Hatchlings. Total length: Between 239.5 mm. and 255.5 mm. Weight: From 32 g, 250 mg. to 47 g. 2) Podocnemis expansa. Originally not native to Upper Caquetá, but introduced as hatchlings from its lower course and río Putumayo in 1940, 1943 and 1955; actually already reproducing. Eggs. Measurements: Between 44.5 : 36.5 mm. and 48.5 : 45.5 mm, Weight: 34 g, 350 mg. and 44 g, 300 mg. Hatchlings. Measurements (Carapace Length) : Between 39.5 mm, and 45.0 mm. Weight: 17 g, 300 mg. and 20 g. 3) Podocnemis unifilis. Eggs. Measurements: Between 41.0 : 28.5 mm. and 51.0 : 33.5 mm. Weight: 15 g. to 31 g. Hatchlings. Measurements: Between 34.0 mm, and 48.0 mm, Weight: 8 g, 750 mg. to 21 g, 100 mg. The nests are between 180 mm. and 210 mm, deep and contain normally from 14 to 27 eggs; the first hatchlings are found in 80 mm. to 150 mm, depth. 4) Light seems to be the main factor for the orientation of hatchlings to find their way in direction to the water; they develop a considerable speed, needing only 25 minutes to cover the distance of 96 meters from the nest to the river shore; here they do not remain in shallow water, but rather dive immediately in direction to the depth of rivers and lakes, evidently seeking for better protection against their natural enemies, even fishes, in the muddy and dark waters. 5) Phrynops geoffroanus tuberosus. Eggs. Measurements: Between 32.5 : 31.5 mm. and 35.0 : 34.0mm. Weight: 13 g, 550 mg. to 22 g. Hatchlings. Measurements: Between 38.5 mm, and 48.0 mm, Weight: 7 g, 700 mg. to 14 g, 750 mg.
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| Format: | Digital revista |
| Language: | spa |
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Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Instituto de Ciencias Naturales
1969
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| Online Access: | https://revistas.unal.edu.co/index.php/cal/article/view/33860 |
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