Puerto Rico leatherback turtle conservation


This video is called Inside Nature’s Giants: The Leatherback Turtle.

From the BBC:

14 April 2013 Last updated at 01:15 GMT

New law to protect Puerto Rico leatherback turtles

Puerto Rico has introduced a new law protecting a swathe of the island’s coast that has become a major nesting site for the world’s largest turtle, the leatherback.

The Northeast Ecological Corridor comprises 14 sq km (5.4 sq miles) of the island’s coast.

The law ends a 15-year battle which pitted developers against green activists and several celebrities.

Leatherback turtles are a highly endangered species.

“Today this important, highly ecologically valuable resource is being protected forever… History is being made,” said Governor Alejandro Garcia Padilla, according to the island’s Vocero news site.

Developers had been looking to build hotels, golf courses and luxury homes in the area, arguing that this would boost the local economy and create jobs.

But the area – boasting lush vegetation and pristine beaches – is now likely to become a centre for eco-tourism.

As well as being a nesting site for the leatherback turtle, the area is home to more than 860 different types of flora and fauna.

It also contains a bioluminescent bay, featuring micro-organisms which glow in the dark.

Leatherback turtles weigh around 600kg (95st) and their shells can be up to two metres (6ft 7in) long.

The shell is flexible and covered in a black leathery skin – hence the name leatherback.

Last August thousands of leatherback eggs and hatchlings were crushed by bulldozers moving waterlogged sand from key nesting areas.

Lesser Antillean iguana in danger


Lesser Antillean Iguana

From the Dutch Caribbean Nature Alliance, 23 March 2013:

The Lesser Antillean Iguana (Iguana delicatissima) was once found throughout the Lesser Antilles, ranging from Anguilla to Martinique, but population sizes have been subject to a rapid decline. Nowadays, the Lesser Antillean Iguana is found on only 13 islands in the region, with St. Eustatius being its last refuge within the Dutch Caribbean, hence its listing on the IUCN Red List as an Endangered Species facing extinction. Of these 13 island populations, only two exceed the long-term minimum viable population size of 5,000 individuals (Dominica and Guadeloupe) and on six the species is on the brink of extinction.

Mainly due to the fact that its “big brother” the Green Iguana (I.iguana) has not been introduced on St. Eustatius, the Netherlands now have the responsibility over one of the last surviving, potentially viable and genetically pure populations of the Lesser Antillean Iguana, which emphasizes the international responsibility to conserve this endangered reptile.

Until recently, St. Maarten was also home to a population of this striking, bright-green miniature dragon, but due to the introduction in the mid-90s of the Green Iguana, that population has seized to exist. The larger and more aggressive Green Iguana not only out-competes its smaller relative, but because the species are so closely related genetically, they can interbreed creating “hybrid” species. This forms a major threat to preserving the integrity of the species.

The Lesser Antillean Iguana and the Green Iguana can be most easily distinguished by the large subtympanic scale that can be found under the jaw on the cheeks and the unmistakable black and green banding of the tail, both typical features of the Green Iguana.

Population sizes for the Lesser Antillean Iguana on St. Eustatius have been estimated in the past at around a few hundred individuals, which is already far below the minimum viable population size. Recent research by IMARES Wageningen UR and the St. Eustatius National Parks (STENAPA) has indicated that since the last survey in 2004 population densities have declined across all habitats on the island and certain populations on St. Eustatius have even disappeared completely. Population densities vary from 0.0 to 2.0 with an average of 0.35 iguanas per square hectare, which is less than one percent of the average densities of healthy populations documented elsewhere.

On St. Eustatius, human hunting is likely a minor problem, shelter and food availability on the island are abundant, invasive predator densities in the wild are relatively low and we know the Green Iguana has not yet invaded. So what can be the cause for the population decline? Lesser Antillean Iguanas need nesting sites that are un-lit, barren, sandy and well-drained, a prerequisite that appears to be limited on St. Eustatius.

Furthermore, the majority of deaths or endangerments of iguanas on St. Eustatius are attributable to anthropogenic causes, mostly in gardens getting entangled in fences or trapped and molested by dogs. So it seems that the lack of nesting sites and high iguana mortalities due to anthropogenic causes are the two core factors limiting recovery of the Lesser Antillean Iguana on St. Eustatius.

Management recommendations

To counter this negative trend a few measures could be implemented for better protection of the wild population: training of customs officials to prevent potential entry of the mongoose and the Green Iguana from neighbouring islands will help ensure these serious threats do not make their way to St. Eustatius; improving enforcement and updating protective legislation will create a supportive legal framework for protection; the development and maintenance of new nesting habitat, a measure that is both easy and inexpensive, and the establishment of a programme to promote “iguana-friendly” gardens will alleviate pressure off the two greatest threats for the Lesser Antillean Iguana on St. Eustatius.

Efforts need to also be relaunched to determine if the Saba Black Iguana, currently seen as an ecotype of the Green Iguana, is genetically distinct or similar to other subspecies in the region, like the St. Lucia Iguana, whose taxonomic status is currently unresolved. Depending the outcome of this research, it could leverage further protection of the iguanas on Saba.

More scientific insight is still needed in the critical biological parameters that limit the recovery of the Lesser Antillean Iguana on St. Eustatius. An on-island husbandry and breeding project could potentially play a crucial role in the survival of the Lesser Antillean Iguana and would increase public awareness for the current status of the species by providing a relaxed setting in which the local community can experience the iguana as the gentle and beautiful animal that it is.

More information:

Debrot, A.O.; Boman, E. K. (2013) The Lesser Antillean Iguana on St. Eustatius: 2012 status update and review of limiting factors. Den Helder: IMARES Wageningen UR, (Report C166/12) – p. 45.

Caribbean fish citizen science


This video from Mexico is called Fish at the Coral Reef – Mayan Riviera.

From the University of East Anglia in Britain:

Marine Diversity Study Proves Value of Citizen Science

Mar. 12, 2013 — Citizen science surveys compare well with traditional scientific methods when it comes to monitoring species biodiversity — according to new research from the University of East Anglia.

Research published today in the journal Methods in Ecology and Evolution shows that methods to record marine diversity used by amateurs returned results consistent with techniques favoured by peer-reviewed science.

The findings give weight to the growing phenomenon of citizen science, which sees data crowd-sourced from an army of avid twitchers, divers, walkers and other wildlife enthusiasts.

The field study compared methods used by ‘citizen’ SCUBA divers with those used by professional scientists, to measure the variety of fish species in three Caribbean sites.

The divers surveyed the sites using two methods — the ‘belt transect’, used in peer reviewed fish diversity studies, and the ‘roving diver technique’, used by the Reef Environmental Education Foundation (REEF) volunteer fish survey project.

Two teams of 12 divers made 144 separate underwater surveys across the sites over four weeks.

While the traditional scientific survey revealed sightings of 106 different types of fish, the volunteer technique detected greater marine diversity with a total of 137 in the same waters.

Dr Ben Holt, from UEA’s school of Biological Sciences, led the research in partnership with the Centre for Marine Resource Studies in the Caribbean and the University of Copenhagen, Denmark.

He said: “The results of this study are important for the future of citizen science and the use of data collected by these programs. Allowing volunteers to use flexible and less standardised methods has important consequences for the long term success of citizen science programs. Amateur enthusiasts typically do not have the resources or training to use professional methodology. Our study demonstrates the quality of data collected using a volunteer method can match, and in some respects exceed, protocols used by professional scientists.

“Enlisting the help of a large pool of volunteers helps professional researchers collect valuable data across many ecosystems.

“The popularity of SCUBA diving has resulted in monitoring of the underwater environment on a scale that was previously impossible. For example, the REEF method has been used by volunteers in more than 160,000 underwater surveys across the world. It would have cost many millions of pounds for professionals to have undertaken the same work.

“Very few, if any, scientific groups can collect data on the scale that volunteer groups can, so our proof that both methods return consistent results is very encouraging for citizen science in general.

“I think we will really see the value of volunteer schemes increase in future. We’re living in a world that’s changing very significantly. Environmental changes are having a big impact on ecosystems around us so we need to harness new ways of measuring the effect.

“For example Lion fish is an invasive species which was not in the Caribbean until roughly 10 years ago. They have now become a real problem in many areas and this invasion has been tracked using volunteer data. Following our study, scientists can have more confidence when using these data to consider the impact of threats, such as invasive species, on the wider natural communities.

“It is important to note that our study does not consider the abilities of the individuals performing the surveys and this is also an important consideration for any large scale biodiversity program. By addressing these issues we can make important steps towards enabling the large pool of volunteer enthusiasts to help professional researchers by collecting valuable data across many ecosystems.”

The research was carried out in under water sites close to South Caicos in the Turks and Caicos Islands.

Protecting Caribbean nature


From the Dutch Caribbean Nature Alliance, 9 March 2013:

The government of the Netherlands has designated four new coastal and near-coastal Wetlands of International Importance on the Netherlands Antilles island of Curaçao. One of the new so called ‘Ramsar Sites’ is Rif-Sint Marie, a conservation area and an important bird area of 667 ha.

Elkhorn Coral (Acropora palmata) (photo: Mark Vermeij)

Elkhorn Coral (Acropora palmata) (photo: Mark Vermeij)

Rif-Sint Marie

The area of Rif-Sint Marie is relatively undisturbed and undeveloped and comprises a salt marsh surrounded by mud flats, shrub land, and forests. The marsh is a strategic feeding habitat for flamingos and several waterbirds. The coral reef of Rif-Sint Marie is well developed and shelters several threatened coral species such as elkhorn coral (Acropora palmata) and staghorn coral (Acropora cervicornis), as well as endangered turtle species as leatherback turtle (Dermochelys coriacea; NL: lederschildpad) and hawksbill sea turtle (Eretmochelys imbricata, NL: karetschildpad) and threatened fishes like Goliath grouper (Epinephelus itajara, NL: itajara*).

Dense thickets of elkhorn coral sustain major ecological processes such as gross community calcification and nitrogen fixation; dense populations of this branching species dissipate wave energy and thus protect the coast. The area is currently used for recreational purposes like hiking, biking and guided eco-tours. The major threats to the site are uncontrolled access of visitors with dogs disturbing flamingos and potentially unwise development of touristic infrastructures in the surrounding area.

*The itajara is a fish of the Serranidae family

Text: Nathaniel Miller, DCNA

Caribbean bats discovery


By Clifford de Lannoy MSc, Carmabi foundation in Curaçao:

It was on January 15th 2013, during a bat research session in one of the important bat caves on the eastern part of the island of Curaçao, that local bat researchers of ABC-islands’ Bat Protection Program or PPR-ABC (PAP: Programa pa Protehé Ratonnan di Anochi di islanan ABC) captured and released two individuals of the Curaçaoan Long-nosed bat (Leptonycteris curasoae), which were previously tagged on Bonaire.

Curaçaoan long-nosed bat (picture: Jafet M. Nassar)

Curaçaoan long-nosed bat (picture: Jafet M. Nassar)

This finding signifies a major breakthrough in understanding the population dynamics of this key species in northern South America, and especially in the case of the ABC-islands. After more than 4 years of continuous work on Bonaire and 1 year of work on Curaçao and Aruba, we got the first two animals that show a behavior that could be common for the species in this set of islands: they can switch islands for food by flying across the sea. The Curaçaoan long-nosed bats are together with the Miller’s long-tongued bats (Glossophaga longirostris), the main pollinators of all columnar cacti on the islands, which in turn are a major food source for the local terrestrial fauna. Later that week another tagged bat from Bonaire was caught in the most western major cave of the island (Kueba Bosa 3). Could these mammalian pollinators be travelling to Aruba too?!

Curaçao harbors a total of 9 species (including the two previously mentioned pollinator species) of bats that feed on nectar, insects, fruits and even fish.

The current bat research activities conducted on Curaçao, Aruba, Bonaire and northern Venezuela are part of a long-term Bat Research and Conservation Plan designed and conducted under the coordination of four institutions: Arikok National Park Foundation in Aruba, Carmabi Foundation in Curaçao, Stinapa Bonaire in Bonaire, and Insituto Venezolano de Investigaciones Científicas (IVIC) in Venezuela. A specific component of this plan is to acquire more knowledge on the population dynamics of the Curaçaoan long-nosed bat. Previous research conducted by Carmabi and international bat researcher Sophie Petit on the major bat caves of Curaçao in the previous decades showed heavy seasonal fluctuations in population sizes of mainly the Long-nosed bat. Sometimes normally densely populated caves were found totally empty. Until last Tuesday, it was only hypothesized that these bats might travel between the ABC-islands and the possibly the Paraguaná peninsula (northwestern Venezuela). The capture of the Bonairean bats confirmed that, at least, there is connection between the populations of this species inhabiting Bonaire and Curaçao.

The Curaçao team together with bat specialists (picture: Jafet M. Nassar)

The Curaçao team together with bat specialists (picture: Jafet M. Nassar)

The bats have been tagged by ringing them on their forearm with coded aluminum rings. The code constitutes the initials of the bat specialist supervising the project, Jafet M. Nassar, the initial letter of the island where the bat was marked, followed by a unique number that reflects the number of bats ringed on each island. Lepto JNB 0577 was ringed 2.5 years ago and Lepto JNB 2046 was ringed in November 2011 on Bonaire. Although this finding constitutes a major breakthrough for the study of bats on the ABC islands, many critical questions about the bat species inhabiting the islands still remain unanswered and continued research on all three islands and Venezuela is necessary to understand and protect these very important and threatened mammals in this part of the Caribbean

For more information and nice pictures visit PPR-ABC Curacao-team Facebook page: Bat Conservation Curacao.

Caribbean bats, less than in prehistory


This video is called Bats in the Caribbean.

By Annalee Newitz, i09:

What Destroyed the Bats of the Caribbean?

Some 25,000 years ago, bats once dominated the Caribbean. Did rising sea levels drive them away?

Tue Nov 13, 2012 11:26 AM ET

About 25,000 years ago, the Earth was a very different planet. It was deep in the midst of a geological period referred to as the “last glacial maximum,” meaning the last time when the planet was so cold that glaciers reached down from the North Pole into North America, Europe and Asia.

With so much water frozen solid, the ocean levels were much lower. And that was good news for a huge population of bats who ruled the considerably larger Caribbean islands of that age. While there are still many bats in the Caribbean today, the population 25,000 years ago was a lot richer and more diverse.

Some of the islands were many times larger than they are at present, and they teemed with many species of bats. The fossil evidence for these bats surrounds the islands, and scientists have long wondered what [killed] them off.

One theory was human hunting, and another was that the caves these bats loved were inundated with water as sea level rose.

Writing in a new paper published this week in Ecology and Evolution, biologists Liliana M. Dávalos and Amy L. Russell argue that the evidence overwhelmingly points to rising sea levels as the culprit. As the glaciers melted, sea levels rose so rapidly that the island bats couldn’t find a new home quickly enough — and so they died out.

Dávalos and Russell note that this die-off gives us a snapshot of what might happen to wildlife on Earth over the next few centuries as water levels rise rapidly.

While we may not be certain how many inches the ocean will rise as the polar regions melt, we can be sure of one thing. Historical evidence demonstrates that sea level rises lead to extinctions.

The question is only how bad they will be.