Spotted barbtails in Venezuela, new study


This is a spotted barbtail video from Colombia.

From The Wilson Journal of Ornithology in the USA, December 2014:

Breeding biology of the Spotted Barbtail (Premnoplex brunnescens)

Daniel Muñoz and Thomas E. Martin

ABSTRACT

The Spotted Barbtail (Furnariidae) is poorly studied but shows some extreme traits for a tropical passerine. We located and monitored 155 nests to study this species for 7 years in an Andean cloud forest in Venezuela.

Spotted Barbtails have an unusually long incubation period of 27.2 ± 0.16 days, as a result of very long (3–6 hr) off-bouts even though both adults incubate. The long off-bouts yield low incubation temperatures for embryos and are associated with proportionally large eggs (21% of adult mass). They also have a long nestling period of 21.67 ± 0.33 days, and a typical tropical brood size of two.

The slow growth rate of the typical broods of two is even slower in broods artificially reduced to one young. Nonetheless, the young stay in the nest long enough to achieve wing lengths that approach adult size.

Leatherback turtles and sea level, new study


This video is called HD Leatherback Turtle footage (Dermochelys coriacea).

From Wildlife Extra:

Researchers find the wetter the nests, the fewer sea turtles are hatched

Leatherback turtles are vulnerable to rising sea levels

Sea level rise has been studied in terms of its impacts on coastal ecosystems and habitats; but few studies have looked at its effects on mobile marine species, or their use of coastal habitats.

Many ecosystems that are threatened by sea level rise are home to sea turtle nesting sites. There are seven species of sea turtles in the world, four listed as endangered and two listed as vulnerable.

Conservation and research groups are working to preserve and protect the turtle nesting habitats from human encroachment but, a new study says, their efforts are fighting an uphill battle as oceans continue to rise.

While it’s true that sea turtle nesting habitat could disappear in the future, there is a more imminent threat resulting from sea level rise: environmental changes to turtle nests.

The environment of nests has a number of known impacts on reptile eggs and embryo development. Studies have shown that nest temperature influences the sex ratios in new born turtles and high humidity leads to longer incubation times in loggerhead turtles.

But this new study has shown that the sand water content (or moisture) of nests also seems to influence embryonic development. Rising seas, erosion, and an increase in storms are all likely to change the sand water content of nesting sites.

In their study, researchers focused on one species of sea turtle, the leatherback. Compared to other sea turtle species, leatherbacks have lower reproductive success, with successful hatchings averaging only 40 to 50 per cent of the original clutch.

Researchers worked on the Caribbean coast of Colombia where sand samples were taken from two depths at three nesting zones to determine water content.

Turtle hatchings were monitored and recorded, with each hatching representing a successful emergence. Once hatchings stopped, nests were excavated and the remaining eggs were removed. The stage of death of the embryos was determined for each egg.

Overall, the researchers found strong correlations between sand water content and hatching success – increases in moisture led to decreases in hatching. Nests with greater water content yielded fewer turtles.

This could be a major problem for leatherbacks as sea levels continue to rise, especially where nesting sites are also threatened by coastal development. Currently, our oceans are rising about 3.2mm per year, and we are seeing an increase in major storm frequency resulting in coastal erosion.

Suitable habitat is decreasing for many species and if the water content of their nests plays that large a role in the viability of offspring, then turtles are likely to be impacted by this long before their habitat disappears.

However, the researchers feel it is important to keep in mind that animals have the ability to adapt. Turtles may be able to change the structure or permeability of their eggs in order to get around this problem.

The greatest danger is if the environment changes too quickly, they may not have time to adapt.

New nature reserve in northern Colombia


This video is called Colombia, birds and wildlife.

From Wildlife Extra:

New nature reserve created in northern Colombia

ProAves, the Rainforest Trust and Global Wildlife Conservation (GWC) have announced the creation of the Chamicero de Perijá Nature Reserve, the first protected area in northern Colombia’s Serranía de Perijá mountain range.

ProAves has acquired 11 adjacent properties that form the 1,850-acre reserve, which protects a pristine cloud forest environment that includes critical habitat for threatened wildlife.

This reserve’s establishment is extremely timely, as 98 per cent of the Serranía de Perijá’s rainforests have already been destroyed due to colonisation and agricultural expansion.

“Without this reserve, the chances are high that within a few years nothing would be left of the spectacular forests that once covered Colombia’s Serranía de Perijá,” said Dr Paul Salaman, CEO of the Rainforest Trust.

There has been a history of difficulties in conducting research in the area, and so the Serranía de Perijá remains one of the least-known natural environments in the Northern Andes.

Field research by ProAves, however, has confirmed its importance as a stronghold for many endemic and rapidly declining species. It has been established as the home of three endangered and endemic species – the Perijá thistletail, Perijá metaltail, and the Perijá brush-finch.

Several other bird species have also been discovered, including a new brush-finch, tapaculo, screech-owl, and spinetail.

“ProAves has been working in the Serranía de Perijá for almost a decade in an effort to protect its last forested areas,” said Luis Felipe Barrera, Director of Conservation for ProAves. “Thanks to our alliance with Rainforest Trust and GWC, we’ve finally achieved a lasting victory for the region’s imperiled wildlife.”

“The new reserve is globally important, as it is recognised as an Alliance for Zero Extinction site. The incredible fauna and flora include many species found nowhere else in the world,” said Dr Wes Sechrest, Chief Scientist and CEO of Global Wildlife Conservation.

The Chamicero de Perijá Nature Reserve also protects two watersheds that are vital for the city of Valledupar and several towns in the otherwise arid Cesar Department.

“This reserve is a win for everyone. Not only is it going to be a permanent lifeline for the region’s many endemic species that have nowhere else to go, but it is also a major victory for nearby cities and towns that will benefit for years from the water it provides,” said Dr Salaman.