New research about pine martens gives hope

Not fussy about food: new research about pine martens 
gives hope for this endangered species

Researchers from Queen’s University, Belfast, have discovered that pine martens (Martes martes) are more opportunistic and adaptable, in terms of their diet, than previously thought. The findings, published earlier this year in the European Journal of Wildlife Research, present a hopeful outlook for this endangered species, as its adaptability might be key to its future success providing continued legal protection, and provision of suitable habitat

The results of this research, funded by wildlife charity People’s Trust for Endangered Species (PTES), show that despite their diets differing in each location, the eating habits of pine martens remained the same: they focused on a few staple food items and supplemented these throughout the year with seasonally available treats. The seasonal fluctuations in their diet was already documented, but the fact that every population across the range followed the same pattern, was not.

Credit Joshua Twinning.

Surveys were conducted across the pine martens’ range in Northern Ireland, in a variety of habitats including semi natural broadleaf woodlands and coniferous plantations, as well as mixed habitats. Pine marten scats (droppings) were collected from different locations within their range on a monthly basis, to give a detailed picture of exactly what pine martens were eating.

Pine martens evidently have a sweet tooth, as the most commonly consumed food was fruit, with rowan, blackberries and bilberries all on the menu. These were consumed in abundance when available in late summer/autumn. Pine martens also appeared to target songbirds, shrews, grey squirrels and rabbits during each species’ specific breeding season, when they were at their most numerous and vulnerable. Whereas mice and insects – beetles, slugs, snails and earthworms – were eaten throughout the year and were staple foods, which pine martens supplemented with other food sources when available.

Joshua Twining, PhD Student from the School of Biological Sciences at Queen’s University Belfast, who led this project, explains: “The results are quite fascinating; it’s clear that pine martens are not only true opportunistic omnivores, but they’re also highly adaptable, and unlike many other species, they can switch their diet depending on what’s available around them at any given time.”

Credit Joshua Twinning

Rare and elusive, this enigmatic and magnificent member of the mustelid family are a native species to the British Isles and were once one of the most abundant predators in the country. Now, there are only an estimated 3,043 in Ireland and 8,900 in Great Britain, with approximately only 100 thought to be living in England.

Joshua continues: “Our findings are very exciting, as they start to explain the somewhat miraculous recovery of this species. Pine martens are starting to recover from a severe historical decline which resulted from the combined effects of widespread persecution in both Britain and Ireland, and habitat loss. Their recovery is surprising, as despite legal protection granted in the 1980s* (which has really helped protect those that remain), there is still a complete lack of suitable habitat, specifically old growth coniferous and deciduous woodland. The gradual increase in their numbers being witnessed – despite these landscape limitations - can now in part be attributed to their opportunistic and adaptable diet. Our evidence shows they can adapt and survive in a variety of woodlands, including the immature commercial plantations that make up the majority of the U.K’s forest cover, and are not just restricted to their traditional habitat of ancient woodland, which is fantastic news for this species.”

Nida Al-Fulaij, Grants Manager at PTES, says: “European pine martens are on the long road to recovery, and although they’re starting to recover in some areas, they still have a long way to go and remain one of the most threatened species in Britain. Less than 0.1% of Ireland and 2.4% of the U.K is made up of ancient woodland, so in order to help bring them back, we need to continue to conserve and manage our woodlands to ensure they provide suitable habitats for pine martens, as well as ensuring their legal protection is maintained. If these two aspects are continued, the newfound adaptability of their diet will enable them to survive.”

Credit Joshua Twinning

Nida continues: “Pine martens are an extremely important part of the ecosystem. Not only do they disperse seeds throughout the environments they live in, but they can also lower disease prevalence through removing carrion, as well as potentially playing a role in managing invasive species such as grey squirrels which in turn helps to bring back native species, such as red squirrels. Joshua’s work is a hugely positive step forward in helping us to understand pine martens, which hopefully will aid their recovery long term, too.”

To date PTES has awarded £6.5 million to research and conservation around the world and has funded 102 internships since 2002. The charity’s intern alumni includes conservationists working for wildlife NGOs, ecological consultancies, government agencies and universities, of which Joshua is one. Previous interns have developed software to identify different animals moving through wildlife mitigation tunnels, produced parkland management guidelines for rare invertebrate species and worked on DNA extraction and identification to help stop the trade in endangered wildlife.

Joshua concludes: “The gradual recovery of pine martens should be welcomed and cherished, as this wonderful and elusive mammal not only adds a little magic back into the wilds of Britain & Ireland, but as a small predator it’s key to returning our native ecosystems back to their natural order.”

The paper, entitled "Seasonal, geographical, and habitat effects on the diet of a recovering predator population: the European pine marten (Martes martes) in Ireland", can be accessed here. To find out more about this project, click here, and to find out more about PTES’ internships visit here.

* pine martens were granted protection under the Wildlife and Countryside Act 1981, when they were established as a protected species.

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