Band 10, Heft 3-4, Seite 258-260

Forsyth, I.: Einige Ergebnisse aus zehn Jahren(1987-1997) Markierungen und Beobachtungen am Kleinabendsegler (Nyctalus leisleri) in Lagan Valley, Co.Antrim, Nordirland, Vereinigtes Königreich
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1. Weibliche Kleinabendsegler wechseln häufig Wochenstuben während und zwischen der Saison im Lagan Valley, Co. Antrim, Nordirland.
2. Viele Wochenstuben werden nur für einen Teil der Saison genutzt.
3. Einige Quartiere werden die ganze Saison hindurch genutzt.
4. Bei einem Dauerquartier gab es einen Wechsel der Fledermäuse, doch einige scheinen während der ganzen Saison quartiertreu zu sein.
5. Erwachsene Weibchen verlassen die Wochenstuben bald, nachdem die Jungen fliegen können.
6. Gegen Ende Juli sind es zumeist die Jungen, die die Quartiere bevölkern.
Weitere Punkte siehe z. T. im deutschen Text.


Some results for a ten-year (1987-1997) banding study of Leisler's bats in the Lagan Valley, Co. Antrim, Northern Ireland, UK

1. An initial bat roost survey by the Northern Ireland Bat Group in 1986 showed that the 10 kilometre Square J26 (Lisburn, CountyAntrim) had 21 reported bat roost sites, the highest of any square in Northern Ireland.

2. Three of us decided to work on the bats present in J26, so we were trained in banding bats by Dr. R. E. Stebbings.
(Ian Forsyth, Pamela Allen, Sarah Rogers),

3. To start with, both Leisler's and Pipistrelle bats were banded. Only Leisler's bats were banded after 1993.

4. A system of catching and recording individual bats as they emerged from a roost site was devised, so that the exit pattern could be established. No ladders were used.

5. There appears to be some pattern of relationship between emerging bats. Using bands, a roost can be sampled only a few times during the maternity season. Transponder techniques are now available. Roost activity can now be continuously monitored without further disturbance
once transponders are applied.

6. Pre-maternity Roost
In April 1990 bats at a pre-maternity roost at Feumore were netted and banded. This roost is used only in the month of April and only by female Leisler's bats.
Further banding at this site demonstrated that:
a) there was a rapid turnover of bats during the short period of use
b) 15 bats ringed at 4 separate sites in the Lagan Valley were retrapped at Feumore in subsequent years; and 3 bats ringed at Feumore were retrapped at 3 different sites in the Lagan Valley (14 km distance).

7. Movement between roosts in the Lagan Valley.
133 records ofbetween-roost movements were obtained, relating to 21 roosts (see Table of Interchange and Map showing Roost Sites).

8. Retrap Rates (retraps from subsequent years).
Lagan Valley 1987-1997 (21 roosts) 1435 ringed, 365 retrapped - 25%.
Other roosts sampled:
Dungannon 1993-1997 (1 roost) 188 ringed,
110 retrapped-58%
Templepatrick 1993-1996 (1 roost) 173 ringed,
43 retrapped - 24%
(note: at Templepatrick there are several exit points, and retrapping is not efficient).

9. Population Size of Lagan Valley Roosts.
An analysis using the trap/retrap data gives the following estimates:
Overall Survival 0.6585 Life Expectancy 2.7929
Population Estimate = 500.
A summation of the best counts at 16roosts gives a grand total of 897 !

10. Team: 2 Catchers, 2 Extractors, 1 Runner, 1 Ringer, 1 Scriber, 1 Releaser, 1 Taper Recorder.
Helpers over the years: 42 members of Northern Ireland Bat Group plus 25 others.