Thanks to a revised photograph identification technique, developed originally for tigers, researchers from the Wildlife Conservation Society (WSC) are able to better recognise individual jaguars in Bolivia than previously possible.
Coat patterns are as unique as our fingerprints, allowing researchers to accurately log data about individuals. The technique involves creating a digital map of an individual’s coat pattern by stitching a series of photographs together which have been taken by camera traps or even tourist photographs. The use of this method has spread throughout the animal kingdom to include species such as grey seals, cheetahs, whale sharks and now, jaguars.
The technique is also proving to be useful for persecuting those involved in the illegal fur trade. Animals can now be traced back to their natural habitat through the development of ‘maps’ created by digital imaging. This drives the direction of investigative enquiries by establishing the location of the population in the wild.
WSC researchers using the photograph identification technique have been able to recognise 19 individual jaguars from a total of 975 photographs taken by only one camera. The number of photos taken during this study is at record high due to digital cameras being used rather than the normal traps that use film. The practice of using spot patterns to identify individual jaguars has been made possible due to the high resolution offered by digital cameras.
The ability to accurately identify individuals at such a high resolution will allow researchers to gain an intimate insight into the lives of these secretive animals and how best to protect them against the dangers of poaching.
Posted by haleydolton on October 28, 2011
You would probably recognise them by their distinctive appearance, but how much do you know about the toothed whale, the narwhal? It turns out researchers are also vague about the specifics of a narwhal’s life and how it may change as a result of global warming.
The WWF are trying to establish how Arctic melting is affecting ice – associated species such as the narwhal. Dr. Peter Ewins of WWF-Canada and his team tagged nine individuals in August of this year to try and establish how the elusive narwhal would cope with shrinking sea ice. Dr. Ewins is waiting on the results of their movement patterns to compare with anecdotal evidence of local Inuit’s to try and initiate a successful conservation plan. This is because narwhals are classed as near threatened by the IUCN, with their population at only approximately 50,000 – 80,000 individuals due to hunting practices for their meat and tusk.
Their long, helical tusk was thought to have initiated the fairytales of unicorns and who could blame anyone for being inspired by this mysterious species! The tusks originate from their left canine tooth and males can have tusks that reach up to 3m in length and in 1 out of 500 males, two are produced! Females also possess a tusk, but it is shorter and is not helical in shape. It is thought the tusk has evolved via sexual selection in a similar process to that of the peacock and its feathers. In addition to this, you may have thought the tusk could be used to break through ice patches enabling the narwhal to migrate with ease. However, it is thought the tusk is only used as a visual display to others as they are very rarely observed using their tusk in aggressive behavior.
They are the preyed upon by polar bears, orca and of course, humans, which further depletes their population. In addition to this, narwhals have a highly specialized diet (and therefore restricted) possibly hampering the recovery of their population in the future. When the results from this study are published it will provide greater knowledge to the scientific community when the time comes for a conservation plan for this unique species.
Check out Frontier’s blog for more science news!
Posted by haleydolton on October 22, 2011