Characteristics of breeding passerine communities at Earlshallmuir and Tentsmuir, North-East Fife
Abstract
The literature pertaining to a variety of methods for estimating the
abundances of songbirds is reviewed, and the use of two of the main methods -
mapping and transects - is described and discussed. The mapping method is
found to be the most efficient and reliable in the context of the present
study, and work elsewhere in the British Isles suggests that the method
has wide applicability in the region.
Various methods for describing the habitats in which birds occur are discussed.
In the present study the method chosen involved measuring various
parameters of the vegetation within a limited area at each of several
sampling points in five study plots in North-east Fife. It proved a useful
method in the habitats studied - dune grassland, commercial and semi-natural
coniferous woodlands, and deciduous scrub and mature woodland - and results
of the vegetation sampling are discussed in terms of habitat structure and
succession, and in the relationship of this structure to the breeding bird
communities.
The composition of these communities in the study plots is described, as
are the changes over the three breeding seasons 1979-1981, which followed
on from a meteorologically "hard" winter. Over the study period there was
an overall increase in the populations of all five study plots, and this
increase was greatest in the poorest habitat - the dune grassland - and
least in the richest habitat - the mature deciduous woodland. Using indices
to compare the study plots a major difference was found between the grassland
plot and all four woodland plots, amongst which the two coniferous ones were
most similar.
Of the more abundant bird species, Robin, Song Thrush and Coal Tit were
more prevalent in coniferous habitats; Willow Warbler and Blue Tit were
more prevalent in the deciduous habitats. In relation to habitat structure,
the more diverse bird communities were found in the more complex habitats,
and there was evidence of succession in the bird communities concomitant
with habitat succession.
The present study is one of very few in Europe involving woodland habitats
especially of a commercial nature near sea-level, and it was found that
the four woodland study plots were rich in terms of the diversities and
densities of their passerine breeding populations when compared with other
European studies.
Type
Thesis, PhD Doctor of Philosophy
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