Study

Reproductive ecology of the Magdalena River turtle (Podocnemis lewyana) in the Mompos Depression, Colombia

  • Published source details Correa-H J.C., Cano-Castaño A.M., Páez V.P. & Restrepo A. (2010) Reproductive ecology of the Magdalena River turtle (Podocnemis lewyana) in the Mompos Depression, Colombia. Chelonian Conservation and Biology, 9, 70-78.

Actions

This study is summarised as evidence for the following.

Action Category

Relocate nests/eggs to a nearby natural setting (not including hatcheries): Tortoises, terrapins, side-necked & softshell turtles

Action Link
Reptile Conservation

Recover eggs from injured or dead reptiles

Action Link
Reptile Conservation
  1. Relocate nests/eggs to a nearby natural setting (not including hatcheries): Tortoises, terrapins, side-necked & softshell turtles

    A replicated, controlled study in 2005–2006 in one wetland and two riverbank sites in northern Columbia (Correa-H et al. 2010) found that hatching success of Magdalena river turtle Podocnemis lewyana eggs was similar in relocated, artificial and natural nests. Hatching success was statistically similar in relocated nests (58%), artificial nests (21%) and natural nests (41%). The number of eggs infested by invertebrates and fungi was statistically similar for relocated and artificial nests (34%) and natural nests (35%). In 2005–2006, twenty-four nests were relocated higher up the beach away from rising river levels, and seven artificial nests were dug for eggs recovered from turtles that had been harvested by people. A further 22 nests were left in place. All nests were covered with wire mesh cylinders (1 x 1 cm) that were 40 cm wide and 50 cm high, with a 3 x 3 cm plastic mesh on top. In February–May 2005–2006, beaches were searched daily, with the aid of dogs Canis lupus familiaris, to locate turtle nests. All nests were inspected daily and excavated after hatching, or after 74 days of incubation.

    (Summarised by: William Morgan)

  2. Recover eggs from injured or dead reptiles

    A replicated, controlled study in 2005–2006 in one wetland and two riverbank sites in northern Columbia (Correa-H et al. 2010) found that hatching success of Magdalena river turtles Podocnemis lewyana was similar for eggs recovered from harvested adult turtles compared to eggs from relocated nests and natural nests. Hatching success was statistically similar for eggs recovered from harvested turtles and buried in artificial nests (21%) compared to those from relocated nests (58%) and natural nests (41%). In 2005, seven clutches of eggs were recovered from turtles that had been harvested by local people and incubated in artificial nests that were dug into the riverbank. In 2005–2006, a further 24 nests were relocated higher up the beach away from rising river levels and 22 nests were left in place. All nests were covered with wire mesh cylinders (1 x 1 cm) that were 40 cm wide and 50 cm high, with a 3 x 3 cm plastic mesh on top. In February–May 2005–2006, beaches were searched daily, with the aid of dogs Canis lupus familiaris, to locate turtle nests. All nests were inspected daily and excavated after hatching, or after 74 days of incubation.

    (Summarised by: William Morgan)

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