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The NHBS Introduction to Habitats: Farmland

Hana Ketley
Hana Ketley
Farmland by Tony Armstrong-Sly via Flickr

The next habitat in our NHBS Introduction to Habitats series is farmland. Farmland encompasses a wide variety of different habitats, many of which can be rich in wildlife. Farmland itself is not defined under the UK Biodiversity Action Plan as a habitat, but it contains four habitat types that are identified: arable and horticulture, boundary and linear features, improved grassland and standing open water. These habitats are important for many plant species, as well as a variety of birds, mammals, amphibians and reptiles.

Farming has been a part of the UK landscape for thousands of years and methods are constantly changing as consumer tastes shift and new technological innovations emerge. With an estimated three-quarters of the UK being farmland, it is unsurprising that these habitats are used by so many species. It is also not surprising just how important environmentally friendly farming practices are.

The need to utilise as much of the land as possible to increase productivity has led to a rapid decline of boundary and linear features, such as stone walls and hedgerows. These features constitute a significant ecological part of the farmland habitat, providing variety, food and shelter for wildlife, as well as helping to reduce run-off, flooding and soil erosion. Hedgerows and tree lines can also play an important role in carbon sequestration in agricultural landscapes.

What species can you find here?
Flora

Beyond crop species, farmland can be home to a large number of flora species that can all play key roles in the ecosystem. These plants support the large variety of fauna species found on farmland. The abundance and diversity of plant species depends on the type of habitat and the level of ‘improvement’. Improved grasslands are areas that have been re-seeded and treated with chemicals, such as fertilisers, herbicides and pesticides, and typically species diversity is much lower compared to unimproved or semi-improved grasslands.

Blackthorn (Prunus spinosa)

Blackthorn by Rob Hodgkins via Flickr

A common hedgerow species, blackthorn flowers in early spring and produces fruits in autumn and winter, providing an important food source for many species, including invertebrates and birds. It is visually similar to several other species, such as wild plum and wild cherry, but can be distinguished by its fruit size, leaf shape and the time of year that the flowers bloom.

Common Hawthorn (Crataegus monogyna)

Hawthorn flowers by Bjorn S and haws by Tristram Brelstaff via Flickr

Hawthorn is another common hedgerow species, providing food and shelter for species such as yellowhammers (Emberiza citrinella) and the hawthorn moth (Scythropia crataegella). The red berries, called haws, develop during autumn and winter, and are an important source of food during the colder months for many farmland species. Did you know that hawthorn was originally associated with May Day? It was used before the development of the Maypole, with its leaves and flowers used in garlands.

White Clover (Trifolium repens)

White clover by Hideyuki Kamon via Flickr

This plant is often used as a companion plant for crops, providing additional ground cover to reduce soil erosion. White clover also fixes nitrogen within the soil, allowing for better crop growth. Clover suppresses the growth of unwanted or damaging plants too, and also acts as a trap for pests to draw them away from valuable crop plants. This practice helps to improve farmland for wildlife as it prevents it from becoming a monoculture, adding more variety in food and shelter resources. The use of cover crops within agriculture has reduced, however, and white clover is much less abundant on farmland than it once was.

Creeping Thistle (Cirsium arvense)

Creeping thistle by Peter O’Connor via Flickr

The creeping thistle is an important source of food for many farmland birds, such as goldfinches and linnets, but it’s often considered a ‘weed’ and is normally quite heavily managed on agricultural land. Its flower heads consist of lilac-pink florets on a cylinder of spiny leaf-like structures called bracts. During the late summer, it releases fluffy, wind-borne seeds en masse.

Fauna

Many iconic UK species use farmland and the fauna present changes depending on the time of year. Farmland can seem to come alive during spring and summer, although there is still much to see during the colder months.

Grey Partridge (Perdix perdix)

Grey partridge by Ekaterina Chernetsova (Papchinskaya) via Flickr

This species is an iconic part of farmland wildlife, with its orange face, dark black semi-circle patch on its abdomen and stripy grey and orange-brown feathers. The grey partridge relies on the seeds, leaves and certain invertebrate species that it finds in open farmland and has a preference for areas with hedges. It is a ground-nesting bird, laying the most number of eggs per clutch of any bird (the record is 25).

Grey partridge numbers have declined by more than 80% in the UK since the 1980s. This has mostly been attributed to a loss of seed sources, habitat loss and predation, for example by cats and foxes. Luckily there are several conservation efforts in place to help this species.

Yellowhammer (Emberiza citrinella)

Yellowhammer by Airwolfhound via Flickr

These brightly coloured birds prefer open countryside with bushes and hedgerows, and so they are often found in farmland habitats. Yellowhammers feed on invertebrates and seeds, relying on farmland seeds during the winter as snow cover can make it difficult to find food elsewhere.

Heart and Dart Moth (Agrotis exclamationis)

Heart and dart by AJC1 via Flickr

Farmland habitats are home to a great many invertebrate species, with a large variety of butterflies and moths. The heart and dart is an easily identifiable moth due to its distinctive markings. It has a blackish v-shaped collar, with a dark dart mark and two circular marks on its wings. The wing colour can vary from lightish grey to a much darker brown. They feed on a variety of plants such as brambles (Rubus spp.), maize (Zea spp.) and lettuce (Lactuca spp.).

Brown Hare (Lepus europaeus)

Brown hare by Caroline Legg via Flickr

While not a true native to the UK, as they were thought to have been introduced during Roman times, this species is now considered naturalised. It prefers a mixture of grassland, arable fields and hedgerows, grazing on vegetation and the bark of young, woody plants. Rabbits (Oryctolagus cuniculus) can also be seen on farmland, although they can be distinguished quite easily as hares are much larger, with longer limbs and longer, black-tipped ears.

Farmland can also support many of the UK’s small mammal species. For more information on those, check out our NHBS Guide to UK Small Mammal Identification.

Threats

Intensification of agricultural practices has led to a reduction in habitat areas that are seen as unproductive, such as hedgerows, rough grassland and open water areas. It has been reported that 60% of farmland species are now in decline. As well as agricultural intensification, other factors behind this decline include changes in farming practices; the use of harmful chemicals, such as insecticides; overgrazing by livestock; destruction of habitats and soil erosion.

Habitat changes caused by development, afforestation or conservation efforts that prioritise alternative habitat types can also pose a threat to farmland. As can changes in management, or a lack thereof; the abandonment of farmland can lead to encroachment by scrubs and trees. While scrubland can be an important habitat for many wildlife species, it is not necessarily suitable for all farmland species, such as ground-nesting birds that prefer open habitats. This could lead to a change in community structure and may even lead to localised extinction of vulnerable species that rely on farmland and cannot survive in other habitats. Changes in land use through development can also impact in a similar way. Furthermore, if the land was originally woodland or wetland, for example, there may be a push to restore it to its previous habitat type, which may not be suitable for the species previously inhabiting the farmland area.

Farmland habitats also face climate change-related challenges. Changes in precipitation, increased extreme weather and increased temperatures can lead to soil degradation, reduced plant growth and changes in the availability of food, shelter and fresh water for wildlife. These factors can also impact crop production, and where this results in reduced yields, this increases the need for agricultural intensification to meet demands, further impacting the farmland ecosystem.

Hopes for the future

A change in the way farmers receive subsidies may signal a shift away from a rather bleak picture for these habitats. Previously, farmers were paid grants based on how much land they owned and farmed. This encouraged them to use as much of their land for productivity as possible. Now, however, farmers will be paid for more sustainable practices instead. Under the Sustainable Farming Incentive, grants will be rewarded for restoration of non-crop habitats, the provision of resources for farmland species year-round and reducing the use of harmful pesticides.

Useful resources and further reading

Farming and Birds
Ian Newton
Hardback | £32.50 £34.99

 

 

 

Wildlife Conservation on Farmland, Volume 1
David W Macdonald and Ruth E Feber
Hardback | £78.99

 

 

 

 

Farmland Conservation: Evidence for the effects of interventions in northern and western Europe
Lynn V Dicks et al
Paperback | £34.99

 

 

The Shepherd’s Life: A Tale of the Lake District
James Rebanks
Paperback | £9.99

 

 

All prices correct at the time of this article’s publication.