Biology and Conservation of Threatened Migratory Bats Pipistrellus nathusii and Myotis dasycneme
Results of an international seminar held at the NABU Academy Gut Sunder, Germany, 2-3 December 1998
|A major recent achievement in European ecopolitics has
been the Agreement on the Conservation of Bats in Europe (established under the Bonn
Convention). European conservationists are working successfully towards its
implementation. Although much has been achieved in bat conservation in Europe, there is no
room for complacency. Especially for the migratory bats (e.g. Pipistrellus nathusii and
Myotis dasycneme) several international activities have to be taken in the field of
conservation, management, research and monitoring.
An international seminar was held at the NABU Academy Gut Sunder, Germany, 2-3 December 1998, to present an overview of the status of P. nathusii and M.dasycneme and to discuss the demands for species conservation actions. This paper presents a summary of the seminar.
The Conservation of Nathusius's pipistrelle (Pipistrellus nathusii)
Proposals for action
Action 1: Collection and evaluation of existing data
An urgent task in bat conservation is the centralisation and international co-ordination of the available data. Data of ringing, roost and habitat observations should be combined into a single databank. The data can be analysed and discussed with support of a geographical information system.
Action 2: International census
Parallel to step 1 an international observer-network should be established to carry out a Europe-wide census. The objectives of the census are:
The census should in principle cover the entire territory of the species in Europe. Where such is not achievable, the census can take place in representative sample areas.
In each country, a national co-ordinator should feel responsible for the collection and evaluation of the data. In larger countries or where high populations densities occur, regional co-workers should be established.
Result of the nationwide census should be published on a national level as soon as possible (e.g. EUROBATS National Reports). Furthermore, the data of the census should be supplied to an international co-ordinator for summarizing overviews and comparative analysises of the data of all countries.
A certain amount of formal and methodical agreement (e.g. netting, ringing, bat-detector, box monitoring among others), is necessary in order to guarantee the comparability of the data such as the number of the occupied roosts, maternity, mating and hibernation roosts. As far as possible additional data on population biology, reproduction success, colony-size, etc. should also be assessed.
To be successful, the census should be limited in time. In addition its success is dependent on the organization and management of the census data.
The tasks of a co-ordinator probably require the position to be housed with an institution with the necessary technical competence and equipment.
Successful performance of the census will only be possible when adequate financial resources are made available to participating NGOs, bat workers and scientists co-ordinating the work on the European as well as the national and regional level. Without additional financial support (e.g. for training and equipment) especially for the scientists and conservationists of the Central and Eastern European countries the census will fail in its objectives.
Action 3: Research
Partially based on the investigations suggested in actions 1 and 2 an international research project should be directed to answering the following questions:
A concept for the methodology for this project is already being developed and was discussed in the seminar.
Action 4: Report, recommendations and guidelines
At the end of the census and the complementary population-biological examination a detailed report should be produced that;
As a result of this program a very exact focus of the status and situation of Nathusius's pipistrelle in Europe might be expected. For the first time the project would give the possibilty to identify and to protect the transboundary habitats of Nathusius's pipistrelle in Europe. This instrument could be developed as a handbook for the planning-authorities and would help to justify the measures which have to be taken to guarantee the survival of this unique European bat species.
The Conservation of pond bat (Myotis dasycneme)
Proposals for action
Action 1. Ad hoc Census
In contrast to the Nathusius's pipistrelle only relatively few naturalists are studying the pond bat up to now. Therefore an international co-ordinated census has to be the first step to produce a good basis for further research.
Because of the considerable deficits of knowledge, the status and level of threat of the pond bat is not clear. We may, however, assume populations to be present in regions where no assessment has been carried out yet. It must be the primary goal of an internationally co-ordinated nature conservation programme for the pond bat to close the existing knowledge-gaps as quick as possible, by using simple and standardized methods, that are applicable equally in, e.g., Germany, France and Kazakhstan. Detailed research programmes could at this stage be counter productive. The most urgent task consists of the establishment of a centre from which initiatives to develop an international network of observers as well as the implementation of a first international census are co-ordinated.
Actions 1 and 2 which have already been developed in the section dealing with Nathusius's pipistrelle can in principle be transferred to the pond bat. Because habitat-utilization of the pond bat, as far as is known at this stage, shows a distinct relationship to wetland habitats, the observation network could at first focus on the European river systems as well as on lake and wetlands areas of the lowland. In view of the lack of knowledge regarding the distribution and the status of populations of the pond bat it appears advisably to start as quickly as possible with a short-term census directed at such 'wetland habitats'. A more general and detailed and therefore more time consuming large-scale census could be organized as a follow up.
Action 2. Complementary action
Complemantary to action 1 research is necessary to investigate the essential aspects of pond bat biology.
The main objectives of a conservation research programme should be:
The realization of a research project as sketched above, as well as the implementation of an action plan is only feasable when financial resources are made available to organisations performing bat survey work and research. Especially for the bat conservation in the Central and Eastern European countries financial support is urgently needed.
Authors: Tony Hutson (Bat Conservation Trust, London/UK), Herman Limpens (Wageningen/NL) & Ralf Schulte (NABU-Akademie Gut Sunder/D)
Die Tagungsveranstaltung wurde vom Bundesamt für Naturschutz aus Mitteln des Bundesumweltministeriums gefördert. Die Veranstaltungsinhalte und -ergebnisse geben nicht unbedingt die Meinung des Bundesumweltministeriums, des Bundesamt für Naturschutz oder des Naturschutzbund Deutschland (NABU) wieder.