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

a 2016

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

DOSTÁLOVÁ, Alena a Petr PAŘIL

Základní údaje

Originální název

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

Autoři

DOSTÁLOVÁ, Alena (203 Česká republika, domácí) a Petr PAŘIL (203 Česká republika, garant, domácí)

Vydání

Book of abstracts, 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR), Pécs, Hungary, 3–8 July 2016, p. 129, 2016

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10600 1.6 Biological sciences

Stát vydavatele

Maďarsko

Utajení

není předmětem státního či obchodního tajemství

Kód RIV

RIV/00216224:14310/16:00090331

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova česky

populační struktura; blešivec; sucho; toky; bioindikace

Klíčová slova anglicky

population structure; gammarid; drought; stream; bioindication

Příznaky

Mezinárodní význam

Změněno: 11. 1. 2019 21:09, Mgr. Alena Dostálová

Anotace

V originále

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.

Citovat

DOSTÁLOVÁ, Alena a 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.

@proceedings{1349349,
   author = {Dostálová, Alena and Pařil, Petr},
   booktitle = {Book of abstracts, 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR), Pécs, Hungary, 3–8 July 2016, p. 129},
   keywords = {population structure; gammarid; drought; stream; bioindication},
   language = {eng},
   title = {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},
   year = {2016}
}

TY  - CONF
ID  - 1349349
AU  - Dostálová, Alena - Pařil, Petr
PY  - 2016
TI  - 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
KW  - population structure
KW  - gammarid
KW  - drought
KW  - stream
KW  - bioindication
N2  - 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.
ER  -

DOSTÁLOVÁ, Alena a 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 \textit{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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