Post-graduate theses
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| Identifier |
uch.biology.msc//2004katsimanis |
| Title |
Στοιχεία ορνιθοπανίδας των μεσογειακού - τύπου θαμνοτόπων της Κρήτης - βιοκοινοτική και αυτοοικολογική προσέγγιση |
| Alternative Title |
Birds of mediterranean - type shrublands of Crete- community and autoecological perspective |
| Creator |
Katsimanis, Nikos
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| Abstract |
The Mediterranean region is known to be a hot spot of species diversity for many taxonomic groups, which results from three main factors: 1) Geographic location 2) Geologic history and 3) Human action. The Mediterranean-type shrublands (phrygana and maquis) occupy a great portion of Mediterraneans and Cretes area, mainly because of human action since Neolithic. Jacques Blondel and his colleagues have studied matorrals avifauna widely, and they attributed the observed patterns to the geologic history and paleoclimatology of the basin. There is no detailed or quantified study for Greek or matorrals aviafuna. We counted the avifauna in a gradient low phrygana high phrygana low maquis high maquis, intending to study communitys diversity and abundance structure, species distribution, abundance and assemblages in these habitats. We also examined the environmental factors that affect these indices. We studied the matorrals avifauna focusing on community, guild (according to species ecology, origin and modern distribution) and species level. Fixed-radius point counts were conducted to sample diurnal bird species nesting in matorrals. Uni- and multivariate tests were used to A small portion of counted avifauna has evolved in Mediterranean region (Mediterranean faunal type) and this pattern seems to be associated with the history and paleoclimatology of Mediterranean basin. Generally, phryganas bird communities were more homogenous than maquis communities, since in phryganas we observed fewer species with great frequency of occurrence (than maquis). Regarding species composition, maquis (and especially high maquis) diverge significantly from phrygana while β-diversity increases along the gradient. Niche breadth is greater for the typical species at the end of the gradient and this pattern is related to the general laws of ecosystem development. Like many other authors, we found a tendency for α-diversity, species richness, abundance and biomass to increase along the gradient. Tree-nesters are more common and abundant in maquis, groundnesters are more common and abundant in phrygana and shrub-nesters are very common and abundant in both habitats. The frequency of occurrence of species with Mediterranean origin decreases along the gradient and this pattern also seems to be associated with the history and paleoclimatology of Mediterranean basin. Vegetation height is undoubtedly the most important factor affecting diversity structure and species distribution and abundance. Except for this environmental factor, caves/holes existence, altitude, slope, number and diversity of wooden species and other variables seem to be of minor importance. The obtained results for the distribution and abundance of individual species, correspond significantly to the knowledge about species distribution in Crete and species ecology. For some species (mainly the forest species) we found some indications of niche enlargement. Multivariate analysis supports many patterns we already had detected while the derived ordination is based upon habitats vegetation height that species prefer.
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| Issue date |
2004-07-01 |
| Date available |
2004-09-09 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
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Type of Work--Post-graduate theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/c/4/f/metadata-dlib-2004katsimanis.tkl
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| Views |
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