Abstract
The minimal area of an animal populution is determined by A) the area requirement of reproductive units and B) by the viable population size. A) varies due to individually different and seasonally fluctuating home range sizes and is in addtiion strongly influenced by habitat quality. Population survival depends on deterministic as well as stochastic events and can therefore be estimated only with limited probability. A certain limitation of risk factors can be achieved by enlargement of the population size, increase in number of suitable habitats and reduction of isolation between inhabited areas. To determine the size of a “minimum viable population” (MVP) a “population vulnerability analysis” (PVA) is used as most important data base. The objectives of a MVP (e.g. 95% survival probability for the next 100 years) determines the necessary environmental conditions. A method which allows faster predictions was developed for special demands in practical implementation.
A target species should be selected to give qualitative reasons for the protection of areas. Criteria for the selection of target species for conservation were developed which should be modified according to regional conditions.
The concept of target species can also be used to quantify the evaluation of habitats scientifically, which is also an important step for management practises.
The analysis of the data for selected species demonstrates the high variability of the area requirements, above all due to different habitat quality. For a MVP the area requirement is much higher than so far assumed (e.g. much more than 10 km2 for a passerine species). It is not possible to create a generally valid catalogue for the area requirements of species.
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Mühlenberg, M., Hovestadt, T., Röser, J. (1991). Are There Minimal Areas for Animal Populations?. In: Seitz, A., Loeschcke, V. (eds) Species Conservation: A Population-Biological Approach. Advances in Life Sciences. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-6426-8_16
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