DOSTÁLOVÁ, Alena and Petr PAŘIL. Is it better to be big and old or small and young to overcome drought? – a case study of Gammarus fossarum after-drought recolonization of intermittent streams. In Book of abstracts, 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR), Pécs, Hungary, 3–8 July 2016, p. 129. 2016.
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Basic information
Original name Is it better to be big and old or small and young to overcome drought? – a case study of Gammarus fossarum after-drought recolonization of intermittent streams
Authors DOSTÁLOVÁ, Alena (203 Czech Republic, belonging to the institution) and Petr PAŘIL (203 Czech Republic, guarantor, belonging to the institution).
Edition Book of abstracts, 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR), Pécs, Hungary, 3–8 July 2016, p. 129, 2016.
Other information
Original language English
Type of outcome Conference abstract
Field of Study 10600 1.6 Biological sciences
Country of publisher Hungary
Confidentiality degree is not subject to a state or trade secret
RIV identification code RIV/00216224:14310/16:00090331
Organization unit Faculty of Science
Keywords (in Czech) populační struktura; blešivec; sucho; toky; bioindikace
Keywords in English population structure; gammarid; drought; stream; bioindication
Tags International impact
Changed by Changed by: Mgr. Alena Dostálová, učo 423307. Changed: 11/1/2019 21:09.
Abstract
The ongoing climate change affects the flow regime especially of small brooks and is probably related to more frequent extreme droughts, which impact populations of aquatic organisms. An example of strongly affected species is amphipod Gammarus fossarum that inhabits majority of small streams in the Czech Republic. We compared Gammarus populations from 5 pairs of permanent and intermittent sites with similar abiotic characteristics, to find out how were the population structures impacted by previous drought. The populations of gammarids were sampled in autumn after two months of recolonization, and the length of the head (from the upper edge of the head to the base of second antenna) was measured using the image analysis and later recalculated to body length. Intermittent sites had (i) lower after-drought abundance, (ii) predominance of males over females and (iii) fewer juveniles than permanent streams. Among each pair of sites (intermittent/permanent), there were also significant differences in the size structure of the populations. Smaller individuals were more abundant at permanent sites, while bigger individuals (mostly males) dominated at intermittent ones. Considering these results, we hypothesize that in studied streams permanent reaches (where adult specimens can survive drought) are more important sources for recolonization than small interstitial spaces (that are used mostly by juveniles). The differences in the structure of Gammarus fossarum populations at permanent and intermittent sites were noticeable even two months after reflooding, which indicate that used population characteristics have the potential for bioindication of the latest drought.
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