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Blog - culling

Deer in woodlands

Deer in woodlands

by The blog at woodlands.co.uk, 22 June, 2024, 3 comments

Woodland covers some 1,000 hectares of the Ashdown Forest, that is roughly 40% of its area. Much of the woodland is relatively young. However, the forest’s capacity for regeneration / renewal is being damaged by overgrazing.  Local deer populations have grown and now represent a problem. Deer browse / graze on vegetation, shoots, flower buds and foliage are stripped off plants.  Young saplings are damaged and bark is eaten, especially when food is scarce.  Consequently, tree and shrub regeneration is limited.  Other species are affected by the feeding of the deer, either through loss of niches or food.  Among those at risk are small mammals and certain butterfly species. [caption id="attachment_34368" align="aligncenter" width="650"] deer damage[/caption] Damage is found in woodlands in many parts of the country, as deer populations have increased in recent times. In the 1970s, the deer population was estimated to be around 450,000 as compared to today’s estimates of over 2 million.  The National Forest Inventory highlighted that "40 percent of British forests have ‘unfavourable’ levels herbivore damage, which limits the survival of young trees and threatens biodiversity".  Apart from deer damage, there is damage by the grey squirrel populations. Deer browsing can : Prevent natural regeneration Affect biodiversity Affect woodland resilience Reduce food availability to the herd which can lead to starvation / loss of condition Deer are also hosts to ticks.  The ticks may be infected with Borrelia burgdorferi  bacteria and transmit them to humans, resulting in Lyme disease. Deer  also contribute to collisions with motor vehicles; more than 450 deer were hit by vehicles on Hampshire roads last year .  In Scotland,  government agency figures indicate that deer vehicle collisions  [DVCs] have almost doubled between 2008 and 2020.   Sadly, people are injured or killed in DVCs, and the repair cost to vehicles runs into millions. The solution to the ‘problem’ is not clear cut. Culling [the selective killing of animals] to control deer populations is one way in which numbers can be reduced, and the damage to woodland mitigated.  However, this approach has been met with opposition by many, including animal rights organisations.  There is the argument that whilst a reduction in deer numbers might fix some problems in the short term, the subsequent increase in plant growth and food availability might lead to increased breeding by the remaining deer and numbers would then increase again.  Also, unsuccessful or inaccurate shooting leads to animal suffering, mutilation and / or a lingering death.   Some might advocate rewilding and the introduction of apex predators (such as the wolf, lynx, wild cats*) as a means of reducing numbers but that might raise other problems! Deer have been 'part and parcel' of woodlands since mediaeval times, when the forests were used for hunting. In the Ashdown Forest, the number of red deer declined during the C17th,  and poaching was a factor in their decline. Fallow deer numbers also declined. [Fallow deer were introduced to England by the Normans around 1100 AD.]  The deer population roaming the forest has increased significantly in the recent decades, and now there are the relatively recently introduced species, muntjac and sika deer.   There are six species of deer in UK woodlands – the two native species, the red deer and roe deer and fallow, muntjac, sika and chinese water deer make up the four non-native species. The problem of over grazing is not unique to the Ashdown forest. For example, deer numbers in Scotland have doubled in recent years to almost a million since 1990.   Finding sustainable (and humane) solutions to the large numbers of deer is difficult. * Wildcats were once widespread in Britain, but by the end of the 18th century, they were to be found only in the northern regions. [caption id="attachment_34415" align="aligncenter" width="700"] Remnants of birch woodland near Loch Muick are subject to browsing by red deer (especially in the winter), so temporary fences have been put in place to allow for regeneration.[/caption]
Deer, damage and the pandemic.

Deer, damage and the pandemic.

by The blog at woodlands.co.uk, 2 September, 2021, 8 comments

Across the UK, there are several types of deer to be found in woodlands and rural areas namely : Red deer Sika Deer Roe Deer Reeves Muntjac Deer Fallow Deer Chinese Water Deer In recent times, the number of deer has increased and it is thought that there might be as many as two million wild deer in the UK - the highest number for many hundreds of years.  Unfortunately, deer can cause substantial damage to trees and woodlands.  Their feeding can cause a range of problems, which can include [caption id="attachment_34910" align="aligncenter" width="650"] Deer damage - bark removal[/caption] Stripping shoots, flower buds and foliage from plants Damage to woody stems, where a deer has bitten part way through the stem and then the shoot is tugged off - leaving a ragged end Eating the bark from younger trees. This mainly happens in winter when other food sources are scarce In addition to the damage associated with their browsing / eating activities, there is also the damage done by male deer who rub their heads / antlers against the trunks of younger trees.  This rubbing may be for scent marking or to remove the outer skin (velvet) present on a new set of antlers.  The antler rubbing results in cuts in the bark. [caption id="attachment_34415" align="aligncenter" width="700"] Remnants of birch woodland near Loch Muick are subject to browsing by red deer (especially in the winter), so temporary fences have been out in place to allow for regeneration and tree guards in place[/caption] Deer numbers are reduced by culling in order to supply restaurants, farm shops, and the hospitality sector with venison.   However, with the onset of the pandemic and subsequent lockdowns / restrictions  the demand for venison dropped significantly (as has price) so very few deer were culled.  Consequently, the number of deer is increasing.  Deer have probably gone through one or two breeding cycles since the first national lockdown,  and numbers are set to increase.   The increase in deer numbers not only affects the trees in a woodland but also plants of the herb and scrub layer.   The loss of plant species and aspects of the structure of the woodland means that particular microhabitats are lost so that species such as nightingales and warblers are at risk. Without careful management of deer numbers, woodlands could become much more ‘uniform’ as deer have no natural predators (in the UK).  It is important that deer numbers are monitored  as they will do significant (most) damage to woodland in Spring as there’s not much food elsewhere for them. Young trees are particularly at risk, unless they are protected.
Deer Management (Deer Control) in Woodlands

Deer Management (Deer Control) in Woodlands

by Jason, 18 July, 2008, 9 comments

Man has created the necessity for deer management by eradicating the natural predators of deer - the wolf, bear and lynx.  Escapees from deer parks introduced several non-indigenous varieties into the wild.  During the two World Wars, when manpower was limited, deer parks were left in disrepair and escapee deer spread.  With the formation of the Forestry Commission, land owners were encouraged to plant trees.  The aim was to create a national reserve of timber against future conflicts, but also created an ideal habitat for deer.  Improvement in farming practices provided more food. Deer Damage Deer are responsible for forestry and crop damage and, as they increase in number and range, more damage is now seen in gardens in urban areas. The damage they do to trees and plants are as follows: Fraying is damage done by territorial behaviour when deer rub and trash antlers on trees and shrubs. Browsing this is caused by the deer’s natural feeding and can kill or inhibit the growth of trees (note in the image below, small trees are the same age as the larger ones).  Has the effect of creating 'bonsai'. Control Measures There are numerous so called effective deterrents i.e. lion dung, sweaty socks, chemical agents and mechanical worriers, these are all short term solutions.  The only effective control is proper deer fencing put in by qualified persons, bearing in mind that roe deer can get under an 8” gap. Proper fencing is expensive and is not cost effective on large woodland areas therefore most areas have deer culling taking place in some form or another. [caption id="attachment_34415" align="aligncenter" width="700"] Remnants of birch woodland near Loch Muick are subject to browsing by red deer (especially in the winter), so temporary fences have been out in place to allow for regeneration.[/caption] [caption id="attachment_40967" align="aligncenter" width="675"] Fencing in place[/caption]   Culling This is done these days more and more by trained personnel who have obtained qualifications like DSC Level 1 and 2 from Deer Management Qualification.  These qualifications mean that all culling should take place in a professional, safe and humane manner enabling  field post-mortem to be carried out to confirm the health of the deer and its fitness for human consumption and carried out under strict hygiene  procedures The gralloch (Scottish word for evisceration i.e. removal of internal organs) must take place within 30 minutes maximum or less in the summer, after being culled the carcass must be bled immediately to stop the carcass becoming unfit for human consumption, by law. This generally has to be done in the field depending on how far one has to travel and disposal of the head, feet and gralloch should be by burial in the field (ensuring it is not near a water course).  Thus, taking other countryside users into consideration. Venison  Venison is one of the best meats to eat (recommended by the heart foundation) it is free-range meat with approximately 60% less cholesterol. The purchasing and eating of venison helps promote good deer management as they are looked at as a natural renewable resource,  instead of a pest. All six species of deer in the uk produce good quality venison,  although there is a slight difference in taste between them depending on what the deer have been eating and this can produce quite a unique taste.  It is recommended that a carcass be hung for at least three days to help venison mature, hanging for longer would produce a stronger taste (this should always be in a fly and vermin proof area and at 7 degrees C). Deer Species in the UK Red Deer                        One of our indigenous / native deer and the largest Sika Deer                        Introduced by the Victorians into deer parks and collections, medium sized. Fallow Deer                   Introduced by the Normans for food and hunting. Roe Deer                        The second indigenous / native deer, nearly wiped out in the Middle Ages  Muntjac Deer                Introduced by the Victorians. Chinese Water Deer  Introduced by the Victorians.   [caption id="attachment_557" align="alignleft" width="202"] Fraying[/caption] [caption id="attachment_563" align="alignleft" width="451"] effects of browsing[/caption]