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BQ 3A News > Blog > UK > What deer poo can let us know about the way forward for Britain’s woodlands
UK

What deer poo can let us know about the way forward for Britain’s woodlands

March 14, 2025
What deer poo can let us know about the way forward for Britain’s woodlands
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Brambles are regarded as a nuisance by means of many wooded area managers. However we’ve came upon that fallow deer have a stunning style for it. In our fresh analysis, we discovered this sudden desire by means of analysing plant DNA from fallow deer poo, providing a captivating glimpse into their vitamin. And this discovery may lend a hand us higher know how deer form wooded area ecosystems and affect conservation efforts.

Traditionally, UK deer populations declined on account of overhunting, however nowadays, searching is extra of a passion than a need. As other folks proceed shaping landscapes into urban-agriculture-woodland “mosaics”, we have now created superb habitats for deer, offering abundant meals and refuge, and diminished searching force. Because of this, our deer populations are thriving.

The United Kingdom executive has set a goal of web 0 carbon emissions by means of 2050, with tree planting enjoying a an important position. However rising saplings previous knee top is difficult when deer are grazing within sight. If timber can’t develop, they are able to’t retailer carbon.

Fallow deer (Dama dama) are a well-loved species steadily observed in UK parks. As “intermediate grazers” they devour massive amounts of fibrous plant fabrics, corresponding to grasses, with leafy vegetables when it fits them.

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Research presentations that fallow are one of the most least fussy deer species on this planet – they devour absolutely anything. Additionally they shape massive social teams. So you’ll be able to consider how they thrive in a human-transformed mosaic panorama and the quantity of wear and tear they are able to inflict on woodlands.

Our fresh find out about tested the vitamin of fallow deer within the Elwy Valley, north Wales. Those deer got here from a captive herd on a big property, launched when the fences had been got rid of all the way through the primary international struggle. During the last century, the inhabitants has grown from a couple of dozen to a number of thousand, elevating critical issues amongst wooded area managers.

Part of the Elwy Valley in north Wales.
Llywelyn2000/Wikimedia, CC BY-SA

We used a brand new DNA sequencing methodology referred to as “metabarcoding” to show what plant species had been in round 350 fallow deer poo samples. Those had been amassed from 3 woodlands within the Elwy Valley each and every month for 2 years.

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We additionally surveyed the wooded area plants to find how the deer vitamin associated with the seasonal availability of various vegetation. The within sight Welsh Mountain Zoo kindly equipped poo samples from their fallow deer herd to test in opposition to our effects from the wild deer.

We anticipated deer to devour quite a few grass all 12 months spherical and extra broadleaf vegetation in wintry weather and early spring. However the DNA effects stunned us. Fallow deer ate up important quantities of bramble (Rubus fruticosus agg).

Bramble made up 80% in their wintry weather vitamin, shedding to 50% by means of past due summer season. The deer ingested extra broadleaf timber in spring and summer season whilst they had been in leaf, and ate up massive amounts of acorns in autumn. Grasses accounted for just a small portion in their vitamin, peaking at a trifling 6% all the way through the fall months.

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Our wooded area plants survey had indicated that bramble was once essentially the most prevalent plant within the surroundings. With suitable for eating shoots to be had all the way through the 12 months, bramble supplies a constant meals supply, most definitely enjoying a an important position within the wintry weather vitamin when different meals is scarce.

Penalties for deer, woodlands and web 0

A contemporary record confirmed that Britain’s wooded area canopies are changing into extra open on account of critical storms and the unfold of tree illnesses. This advantages bramble, which will develop again after deer surfing and unexpectedly colonise woodlands the place gaps within the cover permit extra gentle to achieve the bottom. However the courting between bramble, deer feasting and tree regeneration is complicated.

Bramble can offer protection to younger timber from deer by means of forming a spiny barrier, however it might probably additionally smother saplings and coloration out uncommon wooded area vegetation. Against this, heavy deer surfing can suppress bramble enlargement, combating it from out-competing different plants. As deer populations keep growing whilst we attempt to plant extra timber and preserve wooded area habitats, balancing those elements turns into an issue and not using a easy resolution.

Via plant DNA research of deer faeces and abdomen contents, we will acquire precious insights for wooded area control by means of finding what deer are consuming throughout seasons in numerous habitats. We will be able to additionally examine the diets of various deer species (we have now six in the United Kingdom). This manner is helping us construct a extra complete working out of the ecological position of deer in our woodlands.

For wooded area managers, there’s no one-size-fits-all resolution. Merely culling deer would possibly not reach the required results. As an alternative, we advise inspecting what is going on to the bramble, tree saplings and different vegetation in each gentle and shady portions of the wooded area, along side the consequences of deer grazing. Adaptive control – adapted to precise website online stipulations – is central to reaching long-term wooded area well being and a success tree regeneration.

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