Mature trees as keystone structures in Holarctic ecosystems: a quantitative species comparison in a northern English park

Hall, Stephen J. G. and Bunce, Robert G. H. (2011) Mature trees as keystone structures in Holarctic ecosystems: a quantitative species comparison in a northern English park. Plant Ecology & Diversity, 4 (2-3). pp. 243-250. ISSN 1755-0874

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Background: Mature trees often provide ecological niches of value to specialised flora and fauna, signalled by such attributes as epiphytes, trunk rot and dead branches. In Britain, they are often found in parklands and wood pastures which are rare habitats in Europe.

Aims: As species differences in veteran attributes of such trees have not been made, we surveyed eight Holarctic tree species in Chillingham Park, in north-east England, where the stems are of broadly similar age (200–250 years).

Methods: The following variables were scored for 779 trees: presence or absence of veteran attributes, community status (alone, in a group, or in a linear feature), stem diameter, altitude at which growing, and the ground vegetation.

Results: Trees were generally of only moderate mean diameter. Alder (Alnus glutinosa) and ash (Fraxinus excelsior) had the most attributes (4.30 and 4.16 respectively), followed by oak (Quercus sp.) (3.65), then by birch (Betula agg.) (3.49), beech (Fagus sylvatica) (3.12), sycamore (Acer pseudoplatanus) (2.77), larch Larix sp. (2.47) and Scots pine (Pinus sylvestris) (1.92). Trees growing at middle altitudes and alone, or in linear features (rather than in groups), had most veteran attributes; 32% of trees exhibited three or more.

Conclusions: To capture the veteran tree interest of a site, a survey protocol must consider the history of a site as well as the numbers of veteran attributes exhibited by individual trees, which may differ among species. Finally, alder has not attracted particular attention in these habitats, and we suggest that its fast-growing and rot-prone nature may make it of particular interest for conservation of saproxylic biodiversity.

Additional Information:Accepted author version posted online: 24 May 2011 Published online: 17 Oct 2011
Keywords:veteran trees, wood pasture, parkland, alder, beech
Subjects:D Veterinary Sciences, Agriculture and related subjects > D500 Forestry
Divisions:College of Science > School of Life Sciences
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ID Code:4647
Deposited On:26 Aug 2011 09:17

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