SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF
INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE

a 2017

SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE

STRAKA, Michal, Barbora LOSKOTOVÁ, Marek POLÁŠEK a Petr PAŘIL

Základní údaje

Originální název

SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE

Autoři

STRAKA, Michal (203 Česká republika, garant, domácí), Barbora LOSKOTOVÁ (203 Česká republika, domácí), Marek POLÁŠEK (203 Česká republika) a Petr PAŘIL (203 Česká republika)

Vydání

Abstract book SEFS 2017, Olomouc July 2-7, 2017

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10600 1.6 Biological sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Kód RIV

RIV/00216224:14310/17:00097157

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

dry riverved sediment; seedbank; intermittent stream

Příznaky

Mezinárodní význam

Změněno: 12. 7. 2017 19:32, doc. RNDr. Petr Pařil, Ph.D.

Anotace

V originále

Complete loss of surface water flow is a regular event in intermittent streams. This flow cessation is harsh ecological disturbance for aquatic biota, yet a lot of benthic invertebrates can be found in such streams in relatively short period after reflooding. There are two mechanisms of species survival in such environment: high resistance or resilience. The resilience is represented by species ability to survive in refuges (pools, permanent reaches, springs) and recolonize reflooded channel. Resistant taxa are able to survive in dry stream sediments and often form specialized resistant stages (e.g. eggs, diapausing larvae, cysts) which are crucial for long term survival. However, some taxa show the ability to survive shorter dry periods without dormant stages. We examined samples of dry bottom from near-pristine intermittent streams during a summer dry episode when surface water disappeared from their channels. The sediment samples were taken from the surface of stream bottom (maximum depth 15 cm) and at various time after the flow cessation (1 to 90 days). The substrate samples were washed out through the net (mesh size 0.25 mm) and aquatic invertebrates which were still alive were sorted. Differing ability to survive the dry episode was observed within different taxa groups. Survivors’ community composition was compared to the community sampled in wet phase before and after the dry episode to determine which taxa use streambed as a refuge for survival as adults or macroscopic larvae.

Návaznosti

LTC17017, interní kód MU

Název: Validace bioindikačních metod jako nástrojů pro udržitelný management středoevropských vysychavých toků a přenos těchto metod do praxe (Akronym: InterStreaM)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Validace bioindikačních metod jako nástrojů pro udržitelný management středoevropských vysychavých toků a přenos těchto metod do praxe, INTER-COST

Citovat

STRAKA, Michal, Barbora LOSKOTOVÁ, Marek POLÁŠEK a Petr PAŘIL. SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE. In Abstract book SEFS 2017, Olomouc July 2-7. 2017.

@proceedings{1385170,
   author = {Straka, Michal and Loskotová, Barbora and Polášek, Marek and Pařil, Petr},
   booktitle = {Abstract book SEFS 2017, Olomouc July 2-7},
   keywords = {dry riverved sediment; seedbank; intermittent stream},
   language = {eng},
   title = {SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE},
   year = {2017}
}

TY  - CONF
ID  - 1385170
AU  - Straka, Michal - Loskotová, Barbora - Polášek, Marek - Pařil, Petr
PY  - 2017
TI  - SURVIVAL OF AQUATIC INVERTEBRATES IN STREAMBED SEDIMENTS OF INTERMITTENT STREAMS WITH DIFFERENT DURATION OF DRY-PHASE
KW  - dry riverved sediment
KW  - seedbank
KW  - intermittent stream
N2  - Complete loss of surface water flow is a regular event in intermittent streams. This flow cessation is harsh ecological disturbance for aquatic biota, yet a lot of benthic invertebrates can be found in such streams in relatively short period after reflooding. There are two mechanisms of species survival in such environment: high resistance or resilience. The resilience is represented by species ability to survive in refuges (pools, permanent reaches, springs) and recolonize reflooded channel. Resistant taxa are able to survive in dry stream sediments and often form specialized resistant stages (e.g. eggs, diapausing larvae, cysts) which are crucial for long term survival. However, some taxa show the ability to survive shorter dry periods without dormant stages. We examined samples of dry bottom from near-pristine intermittent streams during a summer dry episode when surface water disappeared from their channels. The sediment samples were taken from the surface of stream bottom (maximum depth 15 cm) and at various time after the flow cessation (1 to 90 days). The substrate samples were washed out through the net (mesh size 0.25 mm) and aquatic invertebrates which were still alive were sorted. Differing ability to survive the dry episode was observed within different taxa groups. Survivors’ community composition was compared to the community sampled in wet phase before and after the dry episode to determine which taxa use streambed as a refuge for survival as adults or macroscopic larvae.
ER  -

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