Short-term versus seasonal temperature variation in bat hibernacula

Ralf Gyselings; Luc De Bruyn; Lucinda Kirkpatrick; Alek Rachwald; Grzegorz Apoznański; Tomasz Kokurewicz

Korte termijn variatie tegenover seizoenale variatie in vleermuis overwinteringslocaties

Ralf Gyselings, Luc De Bruyn, Lucinda Kirkpatrick, Alek Rachwald, Grzegorz Apoznański, Tomasz Kokurewicz

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Selectie van overwinteringshabitat in relatie tot thermische variabiliteit is reeds in verschillende studies onderzocht. Het onderscheid tussen lang termijn variabiliteit en kort termijn variabiliteit in temperatuur is echter zelden gemaakt. De meeste studies gaan ervan uit dat een hogere seizoensvariabiliteit, die leidt tot lagere midwintertemperaturen, een hogere korte termijn variabiliteit impliceert.
We bestudeerden thermische variabiliteit in een ondergronds systeem en bovengrondse bunkers gebruikt door een populatie van mopsvleermuis Barbastella barbastellus in West-Polen. Seizoensvariatie is groter in bunkers en dus worden de temperaturen in de winter kouder dan in het ondergrondse systeem. Daarentegen was de korte termijn variabiliteit in de bunkers lager dan in het ondergrondse systeem. Dit maakt bunkers een stabielere omgeving om te overwinteren voor koude minnende vleermuizen in warme winters, wanneer de temperatuur in de bunkers niet onder het vriespunt komt. Gedurende het laatste decennium vond er een continue reeks warme winters plaats en de populatie mopsvleermuizen verhuisde gedeeltelijk van het ondergrondse systeem naar de bunkers. De huidige temperatuurstijging verbreedde het scala aan potentiële overwinteringsplaatsen voor mopsvleermuis.
We onderzochten de relatie tussen seizoens- en kortetermijnvariatie voor verschillende winterslaapsystemen verder op basis van fysische modellen, en toonden aan dat de relatie tussen seizoens- en korte termijn variabiliteit afhangt van het samenspel tussen geleidend warmtetransport door grond en muren, en warmteoverdracht door de luchtstromen.
We combineren theoretische inzichten verkregen door fysische modellering met de resultaten van de studie op mopsvleermuizen om het belang van korte termijn- en seizoen dynamiek te bespreken bij het bestuderen van habitatselectie van overwinterende vleermuizen, met en bepreken de impact van klimaatverandering.

Vertaalde titel van de bijdrage	Korte termijn variatie tegenover seizoenale variatie in vleermuis overwinteringslocaties
Oorspronkelijke taal	Engels
Aantal pagina’s	37
Publicatiestatus	Gepubliceerd - 5-mei-2021

Thematische Lijst 2020

Beschermde natuur
Klimaat

Thematische lijst

Soorten en biotopen
Beheer

EWI Biomedische wetenschappen

B003-ecologie
B002-biofysica
B005-dierkunde

Taxonomische lijst

vleermuizen (Chiroptera)

Beleidsmatig

Habitatrichtlijn (HRL)
natuurbeheer
Natura 2000

Geografische lijst

Europa

Technologisch

modellering

Vrije trefwoorden

Temperatuur
temperature
temperatuursmeting
temperatuur loggers
Thermal Variability Index

Landschapsgebruik, habitatgebruik en klimaatadaptatie bij vleermuizen
De Bruyn, L., Gyselings, R. & Thibau, K.
1/01/20 → 31/12/24
Project: eigen initiatief (position paper)

Dit citeren

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title = "Short-term versus seasonal temperature variation in bat hibernacula",

abstract = "Microsite selection in relation to thermal variability has been addressed in several studies. However, the distinction between long-term variability and short-term variability in temperature has rarely been made. Most studies assume that a higher seasonal variability, giving rise to lower mid-winter temperatures, implies a higher short-term variability. We studied thermal variability in hibernacula used by a population of Barbastella barbastellus in Western Poland. Seasonal variation is higher in bunkers and thus temperatures get colder in winter than in the underground system. On the other hand, short-term variability in the bunkers was lower than in the underground system. This makes bunkers a more stable environment to hibernate for cold dwelling bats in warm winters, when temperatures in the bunkers do not get below freezing. During the last decade, a continuous series of warm winters occurred and the population of barbastelle bats partly moved from the underground system to the bunkers. The present temperature increases broadened the range of potential hibernation sites for barbastelles.We further investigated the relationship between seasonal and short-term variation for different hibernation systems based on physical models, and showed that the relationship between seasonal and long term variability depends on the interplay between conductive heat transport through ground and walls, and heat transfer by air flow.We combine theoretical insights gained by physical modeling with the results of the Barbastelle study to discuss the importance of short-term and seasonal dynamics in studying microsite selection of hibernating bats, with reference to the effects of climate change.",

author = "Ralf Gyselings and {De Bruyn}, Luc and Lucinda Kirkpatrick and Alek Rachwald and Grzegorz Apozna{\'n}ski and Tomasz Kokurewicz",

year = "2021",

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TY - CONF

T1 - Short-term versus seasonal temperature variation in bat hibernacula

AU - Gyselings, Ralf

AU - De Bruyn, Luc

AU - Kirkpatrick, Lucinda

AU - Rachwald, Alek

AU - Apoznański, Grzegorz

AU - Kokurewicz, Tomasz

PY - 2021/5/5

Y1 - 2021/5/5

N2 - Microsite selection in relation to thermal variability has been addressed in several studies. However, the distinction between long-term variability and short-term variability in temperature has rarely been made. Most studies assume that a higher seasonal variability, giving rise to lower mid-winter temperatures, implies a higher short-term variability. We studied thermal variability in hibernacula used by a population of Barbastella barbastellus in Western Poland. Seasonal variation is higher in bunkers and thus temperatures get colder in winter than in the underground system. On the other hand, short-term variability in the bunkers was lower than in the underground system. This makes bunkers a more stable environment to hibernate for cold dwelling bats in warm winters, when temperatures in the bunkers do not get below freezing. During the last decade, a continuous series of warm winters occurred and the population of barbastelle bats partly moved from the underground system to the bunkers. The present temperature increases broadened the range of potential hibernation sites for barbastelles.We further investigated the relationship between seasonal and short-term variation for different hibernation systems based on physical models, and showed that the relationship between seasonal and long term variability depends on the interplay between conductive heat transport through ground and walls, and heat transfer by air flow.We combine theoretical insights gained by physical modeling with the results of the Barbastelle study to discuss the importance of short-term and seasonal dynamics in studying microsite selection of hibernating bats, with reference to the effects of climate change.

AB - Microsite selection in relation to thermal variability has been addressed in several studies. However, the distinction between long-term variability and short-term variability in temperature has rarely been made. Most studies assume that a higher seasonal variability, giving rise to lower mid-winter temperatures, implies a higher short-term variability. We studied thermal variability in hibernacula used by a population of Barbastella barbastellus in Western Poland. Seasonal variation is higher in bunkers and thus temperatures get colder in winter than in the underground system. On the other hand, short-term variability in the bunkers was lower than in the underground system. This makes bunkers a more stable environment to hibernate for cold dwelling bats in warm winters, when temperatures in the bunkers do not get below freezing. During the last decade, a continuous series of warm winters occurred and the population of barbastelle bats partly moved from the underground system to the bunkers. The present temperature increases broadened the range of potential hibernation sites for barbastelles.We further investigated the relationship between seasonal and short-term variation for different hibernation systems based on physical models, and showed that the relationship between seasonal and long term variability depends on the interplay between conductive heat transport through ground and walls, and heat transfer by air flow.We combine theoretical insights gained by physical modeling with the results of the Barbastelle study to discuss the importance of short-term and seasonal dynamics in studying microsite selection of hibernating bats, with reference to the effects of climate change.

M3 - Paper/Powerpoint/Abstract

ER -