Hawksbill turtles’ love life discoveries

This is a hawksbill turtle video.

From the BBC:

4 February 2013 Last updated at 03:26

Hawksbill turtles‘ monogamous sex life revealed

By Michelle Warwicker BBC Nature

The sex lives of critically endangered hawksbill turtles have been revealed by scientists studying the animals in the Seychelles.

Previously, little had been understood about the mating habits of the turtles, which live underwater and often far out at sea.

Researchers were surprised to find that the turtles are mainly monogamous, with females storing sperm from one male and using it to fertilise multiple egg clutches.

The study, led by researchers from the University of East Anglia, Norwich, UK, was published in the online journal Molecular Ecology.

“Sperm storage” is found in animals including reptiles, birds and some turtles, tortoises and terrapins.

Females can store viable sperm from multiple males for long periods of time, meaning that their egg clutches are sometimes fertilised by more than one father.

Researchers carried out DNA testing from hawksbill turtle hatchlings on Cousine Island in the Seychelles to identify how many males were involved in fertilising eggs during a breeding season.

The tests revealed a monogamous mating system: most egg clutches were sired by just one male, and no males had fertilised more than one female during the 75-day season.

“We were surprised that they were so monogamous because actually… genetic monogamy is actually the exception in most animals, not the rule,” said research team member Dr David Richardson.

The findings show that “there are plenty of males out there” for females to mate with.

“It’s very unlikely that it’s just a few males hanging around offshore”, said Dr Richardson. “We think they’re mating with males a long way away, wherever they’re normally foraging and feeding which can be all over the western Indian Ocean,” he added.

The number of hawksbill turtle males contributing to the next generation is important for the species’ survival because it results in higher levels of genetic variation.

Genetic variability “means [the turtles] can respond to new threats, new diseases or anything that comes along,” explained Dr Richardson.

Hawksbill turtles were identified as Critically Endangered by the International Union for the Conservation of Nature after years of being hunted for their shells, which were prized in the now illegal decorative tortoiseshell trade.

Found in tropical waters around the world, females turtles gather at onshore nesting sites such as Cousine Island every few years to lay around five clutches of eggs during the season.

Mating often takes place out at sea, but according to the study, by testing DNA samples from hatchlings on the island, the researchers were able to gather information that would have been impossible from observation alone.

Dr Richardson told BBC Nature that this study, combined with independent reports of hawksbill turtle numbers rising, indicates that “in terms of conservation… maybe we are in a better place than we thought.”

The team hopes their study may help conservationists working on Cousine Island to understand more about the lives of the animals and to focus their efforts.

See also here.

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Seychelles paradise flycatchers helped by schoolchildren

From BirdLife:

Water for birds: Club installs bird baths for Seychelles Paradise Flycatcher

Wed, Jan 23, 2013

Eight bird baths were installed around the the island

An after school clubs called the Friends of the Flycatcher is helping to keep Seychelles Paradise Flycatcher, Terpsiphone corvina watered. The club based on La Digue, Seychelles third largest inhabited island, has installed eight bird baths on different locations on the island for the benefit of the iconic bird locally known as the Veuve. The baths were set up at the Veuve Reserve, the La Digue School, the Flycatcher Lodge, Villa Veuve, and the Community Centre at La Passe.

A source of water is as important to birds as is food. Apart from drinking, water also removes dust, loose feathers, parasites and other debris from a bird’s plumage. Bird baths are man-made shallow pools from which birds can drink, bathe, preen or cool off. They are normally made in the form of a basin.

Seychelles Paradise Flycatcher favours native Badamier Terminalia catappa and Takamaka dominated Calophyllum innophylum broad-leaved plateau woodland in proximity to wetland areas for its habitat. The wetlands and marshes are also important as breeding grounds for insects, which the birds eat.

But in the dry season the marshes dry up, and the birds have been observed going to domestic sources of water which places them in danger of drinking detergent and being caught by cats while on the ground, says Josiana Rose of the Seychelles National Parks Authority (SNPA), and the education officer at the Veuve Reserve.

“Provision of water baths for the flycatcher will give them safe and easy access to water for drinking and bathing during the dry season that persists for many months,” she says.

Nature Seychelles (BirdLife Partner) and the SNPA have been promoting the conservation of the Critically Endangered flycatcher through an advocacy and education project whose aim is to help protect the species in its stronghold on La Digue. The project is part of the BirdLife Preventing Extinctions Programme and is supported by Species Champion, Viking Optical. It’s under this partnership that the Friends of the Flycatcher was started at the school.

Although still in its infancy, the club has been involved in a number of activities including cleaning up the island on World Clean-up Day and planting trees in the Veuve Reserve.

The baths are made of fibre glass and stand up to four feet above the ground on a wooden base.

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Seychelles millipedes and invasive plants

This is a video of a Seychelles giant millipede, attacked by a crab.

Vulnerable Seychelles giant millipedes change their behaviour in response to the presence of non-native plants, a study finds.

Photos are here.

Herbivores (species that eat plants; e.g. caterpillars) consume more non-native (introduced from other places) oak leaf material in areas with diverse native plant communities than in less diverse communities. Why diverse plant communities tend to resist invasion by non-native plants, remains uncertain. Researchers from the Illinois Natural History Survey and the Morton Arboretum have been examining the potential role of herbivores on the invasion of non-native plant species in diverse plant communities. Read more here.

International scientists have developed a database with in-depth information on over 600 plant species, including the black pine, prickly cactus, thyme, milkweed, wild garlic and baby root orchid. Called the “COMPADRE Plant Matrix Database“, it is currently the world’s largest open-access source of endangered, native and feral plant demographics. Read more here.

The Hottentot fig is as beautiful as it is harmful. Native to South Africa, it is recognisable by its large yellow or light pink flowers and its unique other names: Ice Plant or Pigface. The Hottentot Fig was introduced in several countries, including around the Mediterranean Sea, for medicinal and ornamental purposes and to control soil erosion. However, its impressive propagation and seed production rates led to the quick colonisation of vast areas, and the Hottentot Fig became an invasive species in Portugal. It is currently considered one of the 100 worst invasive species on the plane: here.

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Seychelles giant tortoise in Britain

From daily The Morning Star in England:

Darwin’s at home in his new wildlife shell-ter

Friday 17 February 2012

Darwin, the first giant tortoise to be donated to Britain by the Seychelles, settled into his new home today.

The aldabra tortoise has been presented to the Cotswold Wildlife Park as part of a conservation partnership with the Seychelles National Botanical Gardens.

The aldabras originate from the inaccessible Aldabra lagoon in the Indian Ocean and are listed as an endangered species.

He’s already 25 years old but he could be in Burford, Oxfordshire, for a while – aldabras can live to 150.

Seychelles paradise-flycatcher endangered by greed

From Birdlife:

Habitat danger for Seychelles Paradise-flycatcher

Mon, Dec 26, 2011

The illegal felling of mature trees on La Digue island, the stronghold of the Critically Endangered Seychelles Paradise-flycatcher Terpsiphone corvina has been exposed by the local media. In a front page article, the newspaper Le Seychelles Hebdo revealed the shocking story. The damage includes the felling and cropping of several native tree species used by the bird.

The owner of the land had made an application for a tourism development but the Department of Environment had put this on hold so as to carry out a survey. The owner apparently went ahead with land clearing. “Clearing of land and felling of the tree species in question which are protected by law require authorisation by the land use & planning authority and the Department of Environment respectively”, said Nirmal Shah, Chief Executive of Nature Seychelles (BirdLife Partner).

The land owner and the contractor who undertook the works have been fined 50,000 Seychelles Rupees each (about US$ 4,000) by the environment authorities. According to sources on La Digue those fined are refusing to pay and have their own case against the government.

Nature Seychelles, the flycatcher’s BirdLife Species Guardian is currently undertaking a small education and advocacy project on La Digue in collaboration with the Seychelles National Parks Authority (SNPA). The project is funded by Viking Optical, the BirdLife Species Champion.

“The habitat on this tiny island will always be under threat because of increasing development, and consumerism. This is why we established a second population on Denis Island”, says Nirmal Shah. There is a now a breeding population on Denis after the translocation of 23 birds in November 2008 by the Durrell Institute of Conservation and Ecology and Nature Seychelles.

La Digue is a picturesque but rapidly changing island. The Seychelles Government is now investigating the possibility of making La Digue carbon neutral after Cousin Island Special Reserve, managed by Nature Seychelles, showed the way forward by becoming the world’s first carbon neutral nature reserve. “In fact, recent news that the government will phase out all fossil fuel vehicles on La Digue so that only electric ones are used in the future is an excellent move for general environmental protection and eco tourism on the island”, says Shah.

Seychelles warbler back from the brink: here.

Endangered birds: here.

Hope for Seychelles paradise-flycatcher

From BirdLife:

Hope for Seychelles‘ last Critically Endangered species

23-06-2009

The first Seychelles Paradise-flycatcher Terpsiphone corvina chicks to fledge successfully outside La Digue Island, Seychelles for over 60 years is flying on Denis Island, a coral island in the inner Seychelles group. The newly-fledged birds are flying well, very noisy, and being fed by their parents –”typical normal and healthy flycatcher chicks”, according to Nirmal Shah, Director of BirdLife Partner Nature Seychelles, the Species Guardian for the paradise-flycatcher.

The paradise-flycatcher is the only Seychelles species still listed as Critically Endangered. Formerly Critically Endangered Species including Seychelles Magpie-robin Copsychus sechellarum, Seychelles White-eye Zosterops modestus and Seychelles Scops-owl Otus insularis have all been downlisted as a result of conservation action. The population of the paradise-flycatcher has been steadily increasing in recent years. In 1996 there were 69-83 pairs; this had risen to 104-139 pairs by the last comprehensive survey in 2000.

Seychelles Paradise-flycatchers, probably “overspill” birds from the population on La Digue, are regularly seen on neighbouring islands, but have been unable to establish viable populations. The reintroduction to Denis Island is part of a three-year project, funded by the UK Government’s Darwin Initative, and carried out by Nature Seychelles together with the Durrell Institute of Conservation and Ecology (DICE) and the collaboration of other organisations and the Seychelles Ministry of Environment and Natural Resources.

Seychelles Paradise-flycatcher requires mature stands of indigenous badamier Terminalia catappa and takamaka Calophyllum innophylum trees. However, its habitat requirements may be less strict than previously thought. As the population on La Digue has increased, a number of birds have established territories in open woodland with housing encroachment, and an increasing number of tree species are used for nesting.

Nature Seychelles began ecosystem restoration on Denis Island in 2002, with funding from two Global Environment Facility projects facilitated by the World Bank and with the collaboration of the island owners, and this work has continued under the current Darwin Initiative-funded flycatcher project. The island is free of alien predators.

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Seychelles magpie-robin back from brink of extinction

From BirdLife:

Seychelles Magpie-robin success

28-07-2006

A team from Nature Seychelles (BirdLife in the Seychelles) and the Durrell Wildlife Conservation Trust visited Frégate Island from the 28 June to 6 July 2006 to conduct a full population survey of the globally threatened Seychelles Magpie-robin Copsychus sechellarum, and to ring un-ringed robins in order to maintain identification of all individual[s] on the island.

A minimum population of 82 individuals was recorded—ten more than the previous census in April 2005 and the highest number of robins ever recorded on Frégate.

The Seychelles Magpie-robin population is now at an all-time high of 178 birds with 82 on Frégate, 46 on Cousin, 32 on Cousine and 18 on Aride.

There are also future plans to translocate birds to Denis Island.

The species was downlisted by BirdLife to Endangered in the 2005 IUCN Red List.