How cheetahs stay fit and healthy

Date: March 23, 2017

Source: Forschungsverbund Berlin e.V. (FVB)

Cheetahs are categorized as vulnerable species, partly because they have been considered to be prone to diseases due to their supposed weak immune system. However, they are hardly ever sick in the wild. A research team from the German Leibniz Institute for Zoo and Wildlife Research (IZW) recently discovered that cheetahs have developed a very efficient innate "first line of defense" immunity to compensate potential deficiencies in other components of their immune system. The scientists have published their results in the open access journal Scientific Reports of the Nature Publishing Group.

Cheetahs have a relatively low genetic variability which means that, within a population, the individuals have a similar genetic makeup. This is also true for the major histocompatibility complex (MHC), a genome region that regulates the so-called "adaptive" immune system and is typically highly variable in animal species. The adaptive immune system provides a rapid and specific defense against pathogens, if they have been encountered previously. A low MHC variability should therefore result in a weak adaptive immune system and thus a high vulnerability to diseases. This is often the case in species with low MHC variability, but there are some exceptions, the cheetah indeed being one of them. "During our long-term study that begun in 2002, we investigated more than 300 free-ranging cheetahs that live on farmland in Namibia. We did not encounter any cheetah with symptoms of acute infections, nor did we detect lesions in the examined dead animals," explains Bettina Wachter, head of the cheetah research project.

How can cheetahs cope so well with pathogens despite their supposedly weak adaptive immunity? The immune system is divided into three components:(1) the constitutive innate immune system, which provides a rapid first line of defense against intruders, (2) the induced innate immune system such as the local and systemic inflammatory response, which enhances recovery and decreases pathogen growth, and (3) the adaptive immune system.

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New tools to spy on raiding baboons in suburbs of Cape Town, South Africa

Date: March 24, 2017

Source: Swansea University

Scientists from Swansea University's College of Science are part of an international team attempting to better understand the human-baboon conflict in Cape Town, South Africa.

"Raiding baboons are a real challenge in the Cape Peninsula, South Africa," said Professor Justin O'Riain from the University of Cape Town, a co-author on the study published by the journal Animal Biotelemetry, who has been studying baboons in the region for over a decade.

"The baboons enter properties to raid in gardens and bins, but also enter homes and sometimes take food directly from people."

In a previous study, the team showed that whilst the management strategy was keeping baboons away from the urban space, some males were still finding ways in. The team therefore wanted to understand how the baboons were doing this.

"Raiding events are so fast, so intense, that we couldn't keep up following them by foot in urban areas with high walls and security fences. We had to find another method to document the very special techniques baboons were adopting when raiding," said Swansea University PhD researcher Gaëlle Fehlmann, lead author of the study who carried out the fieldwork in South Africa.

"Here at Swansea's Laboratory for Animal Movement we have been developing new technologies to study animal behaviours and use accelerometers to quantify how much an animal moves in the three dimensions," said Dr Mark Holton, co-author of the study.

Such methods have been used for more than a decade, but mainly on birds or sea mammals. The Swansea team designed and built bespoke collars for the baboons that would enable them to precisely track the baboons.

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Of Star Trek, Mark Twain and helmets: 15 new species of wasps with curious names

Date: March 27, 2017

Source: Pensoft Publishers

A total of fifteen new species of parasitic wasps have been described from across the Neotropical region. Apart from belonging to a peculiar group of wasps distinct with large and elongated bodies, the new insects also draw attention with the curious names they have been formally assigned with.

Among them, there are species named after characters from the television series Star Trek and Mark Twain's The Prince and the Pauper, and five wasps bearing species names all translating to 'helmet'. The study, conducted by graduate student Katherine C. Nesheim and Dr. Norman F. Johnson, both affiliated with the Ohio State University, USA, and Dr. Lubomír Masner, Agriculture and Agri-Food Canada, is published in the open access journal ZooKeys.

The larvae of the studied wasps parasitise the eggs of lanternflies and planthoppers. These species inhabit exclusively the Neotropical region, with their range stretching from the Isthmus of Tehuantepec in the north to Misiones in southern Paraguay. Despite being quite abundant in the region, these insects have remained under-researched until recently.

One of the newly discovered wasp is named Phanuromyia odo, where the species name odo refers to the Star Trek: Deep Space Nine fictional character of the same name. In the popular sci-fi television series, Odo belongs to a species of shapeshifters called Changelings. The reason for the scientists to associate the parasitoid with the character is the spectacular variability observed within the insect species. In fact, it was this peculiarity that, at some point, led the entomologists believe they were dealing with two separate species.

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