Showing posts with label Orinoco crocodiles. Show all posts
Showing posts with label Orinoco crocodiles. Show all posts

Sunday, 20 March 2016

Critically endangered crocodile hatchlings from same nest may have multiple fathers

Some clutches fathered by two or three male crocodiles

Date: March 16, 2016
Source: PLOS

Genetic analysis revealed that critically endangered Orinoco crocodile hatchlings from the same clutch may have multiple fathers, according to a study published March 16, 2016 in the open-access journal PLOS ONE by Natalia Rossi Lafferriere from Columbia University and colleagues.

Understanding reproductive behavior helps to inform reintroduction programs for critically endangered species. The Orinoco crocodile is one of the most threatened crocodile species in the world and has been reduced to only a few wild populations in Venezuela and Colombia. One of these populations was founded by reintroducing Orinoco crocodiles in El Frío Biological Station, Venezuela. To understand reproductive behavior of this population of Orinoco crocodiles, researchers collected twenty egg clutches for incubation in the lab for one year and then released the juveniles. They also conducted genetic analysis on the over 330 hatchlings to infer paternity.

They inferred from genetic analysis that there were 14 mothers and 16 fathers of the 20 clutches and that half of the clutches were fathered by two or three males. They also found that fathers contributed unequally to offspring, with six of the 14 inferred males fathering 90% of the total offspring, and three of those six males fathering more than 70% of the total offspring.





Monday, 22 February 2016

Conservationists Release Critically Endangered Crocodiles in Colombia – Herp Digest


 ·        20 Orinoco crocodiles reintroduced to El Tuparro Natural National Park
·        Scientists will monitor crocodiles via radio transmitters

IMAGES: Orinoco crocodiles. Credits for all images: Mauricio “Pato” Salcedo.

New York (February 12, 2016)—The Critically Endangered Orinoco crocodile recently received a helping hand from conservationists working in Colombia, according to the Wildlife Conservation Society.

Twenty Orinoco crocodiles (Crocodylus intermedius) were reintroduced into their natural environment on Tuesday, February 2nd in El Tuparro Natural National Park, a site where an additional 21 crocodiles were released back in May 2015.

The recently released group of crocodiles included twelve females and eight males, ranging between 33 and 43 inches long. Just as the previous group, these reptiles will be carrying radio transmitters to track their movements and monitor their adaptation to their natural environment.

The name given to the selected area was “Crocodile Lagoon.” Located on the right bank of the Tomo River, this location has the essential socio-environmental and logistical properties for the survival of this species.

A biological survey previously conducted in the area confirmed the presence of large predators and abundant wildlife, both of which are indicators of a healthy environment. Some of the species detected included jaguars, pumas, river otters, tapirs and curassows, among others. Additionally, the site has a generous offering of fish, the main food of the Orinoco crocodile.

Another advantage of the “Crocodile Lagoon” is its proximity to Marandúa, an Air Force base located on the opposite bank of the Tomo River, which will not only guarantee the safety of the area, but will also be essential in providing the researchers access to the area for the continued monitoring of the reintroduced crocodiles.

In the case of the Orinoco crocodile, the Fundación Palmarito is one of the ten partner organizations of the PVS, and it has been working to save this reptile since 2011 in partnership with the Casanare Government, Corporinoquia, Parques Nacionales Naturales de Colombia and Grupo GHL.

This initiative stems from the National Program for the Conservation of the Orinoco Crocodile, created in 1998 by the Ministry of Environment and Sustainable Development, along with other organizations.

The intense commercial hunting to which the Orinoco Crocodile was subjected during the second quarter of the previous century—primarily for the sale of its skin—, brought it to its current critically endangered status.

Growing up to 17 feet in length, the Orinoco crocodile is one of the largest crocodilian species in the world. It lives exclusively in the lowlands of the Orinoco basin that straddles both Colombia and Venezuela, and reproduces once a year. Conservationists say that the crocodile’s conservation will ensure the protection of other species, promote the health of rivers and estuaries, and provide a greater opportunity to attract ecotourism.


This reintroduction is part of the Proyecto Vida Silvestre, a program launched in 2014 to protect 10 wildlife species in the Llanos Orientales and Magdalena Medio regions. Proyecto Vida Silvestre is led by WCS Colombia and supported by Ecopetrol and the Fundación Mario Santo Domingo. The project works with ten organizations, one for each species.

Tuesday, 6 August 2013

Orinoco crocodiles to be tracked by satellite

Four of these reptiles will be released and monitored with satellite transmitters 
August 2013. Two of the world's twelve species of crocodiles live in Colombia, the spectacled caiman (Severely threatened locally) and the Critically Endangered Orinoco crocodile.

The Orinoco crocodile can reach seven feet long and is the only crocodile species whose distribution is contained in a single watershed. Although they originally lived throughout the entire area of the Orinoco, it has been endangered by indiscriminate hunting, especially 1930-1950.

"Today there are only two relic populations of these animals in the wild, in Arauca region (At the confluence of the Ele, Lipa and Cravo Rivers) and the Meta region (In the Guayabero, Duda and Losada Rivers)," says the environmental scientist Willington Martinez, of the UN's Roberto Franco Tropical Biology Station.

The Franco station has been working on plans to protect the species by developing a project to reintroduce Orinoco crocodiles into the wild; the project is being run with the Ministry of Environment and Sustainable Development (MADS). The project plans to release and monitor four Orinoco crocodiles, which have been fitted with satellite transmitters in the department of Meta.

Related Posts with Thumbnails

ShareThis