Time keeping in female Myotis emarginatus during reproduction (Chiroptera: Vespertilionidae) [Hospodaření časem samicemi netopýra brvitého (Myotis emarginatus) během rozmnožování (Chiroptera: Vespertilionidae)]

Stránky 131-145
DOI 10.37520/lynx.2020.010
Klíčová slova Phenology, reproduction, life history, circannual clock, Myotis emarginatus
Typ článku Recenzovaný článek
Citace SPITZENBERGER, Friederike a WEISS, Edmund. Time keeping in female Myotis emarginatus during reproduction (Chiroptera: Vespertilionidae) [Hospodaření časem samicemi netopýra brvitého (Myotis emarginatus) během rozmnožování (Chiroptera: Vespertilionidae)]. Lynx, nová série. Praha: Národní muzeum, 2020, 51(1), 131-145. DOI: https://doi.org/10.37520/lynx.2020.010. ISSN 0024-7774 (print), 1804-6460 (online). Dostupné také z: https://publikace.nm.cz/periodicke-publikace/lnsr/51-1/time-keeping-in-female-myotis-emarginatus-during-reproduction-chiroptera-vespertilionidae-hospodareni-casem-samicemi-netopyra-brviteho-myotis-emarginatus-behem-rozmnozovani-chiroptera-vespertilionidae
Lynx, nová série | 2020/51/1

In the years 2012–2017, we studied the annual and diel temporal activity patterns exhibited by female Geoffroy’s bats (Myotis emarginatus) during reproduction by using an infrared light barrier system, videotaping with an infrared camera and sporadic direct counts of juveniles in the roost when the adult bats were not present. We determined the effect of weather on timing and duration of maternity roost occupancy, reproductive periods, return and emergence flights and amount of time spent outside the roost, and estimated the yearly reproductive output. Contrary to the considerable effects of weather conditions on the reproduction phenology in Myotis daubentonii and M. nattereri, timing and duration of reproductive activities of M. emarginatus were remarkably similar over the study period despite distinct inter-annual differences in the occurrence of inclement weather spells causing food shortages and use of torpor. Pregnancy, lactation and roost occupation by adult females were completed every year within 10 to 11 weeks. Adverse spring weather bouts caused considerable fluctuations in the duration of colony formation during early pregnancy, but did not influence the total duration of the pregnancy period. The mean durations of both the emergence and return flights were markedly similar over the study years. An exception was the distinct increase in duration of emergence flight during pregnancy in 2016 and 2017 which might be related to increased colony numbers. With the exception of the year 2015, the standard deviations of emergence flights were small, but in contrast to the quite scheduled return flights during lactation, the mean durations of return flights during pregnancy varied strongly. The return flights executed by juveniles during post-lactation were highly irregular. The mean time spent outside the roost was quite similar over the study years. The estimated yearly reproductive output was low (<52%) and the proportion of non-reproductive females in the maternity colony high. Nevertheless, the colony numbers increased considerably over the study period. The relevance of keeping the annual and diel activity patterns rather inflexible and of an effective social thermoregulation in relation to a trade-off between survival and reproduction are discussed.

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