About: Hydroacoustic assessment of pelagic stages of freshwater insects.

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About: Hydroacoustic assessment of pelagic stages of freshwater insects. Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Two independent surveys showed that aquatic insects can generate echoes comparable with the echoes of small fish. In the open water of two fishless mountain acidic waters of the Czech Republic, a very distinct population of well defined single targets resembling fish (target strength -66 to -50 dB at 120 kHz) was discovered. These targets were found in the depth range of 5-7 m during the day (June-July 1997). At night, most targets were recorded by horizontal beaming (depth < 3m). Towing of ichthyoplankton nets in these horizons revealed the presence of water bugs - Corixidae (Heteroptera), mostly genus Glenocorisa. Target strengths of water bugs was also verified by direct observations in an experimental tank, where it was possible to track side, dorsal and ventral aspects. In three Dutch reservoirs, Petrusplaat, Honderd-en-Dertig and De Gijster the targets of ascending dipteran pupae (Chironomidae, Procladius signatus) with target strength of -74 to -65 dB were observed by vertical beaming. Two independent surveys showed that aquatic insects can generate echoes comparable with the echoes of small fish. In the open water of two fishless mountain acidic waters of the Czech Republic, a very distinct population of well defined single targets resembling fish (target strength -66 to -50 dB at 120 kHz) was discovered. These targets were found in the depth range of 5-7 m during the day (June-July 1997). At night, most targets were recorded by horizontal beaming (depth < 3m). Towing of ichthyoplankton nets in these horizons revealed the presence of water bugs - Corixidae (Heteroptera), mostly genus Glenocorisa. Target strengths of water bugs was also verified by direct observations in an experimental tank, where it was possible to track side, dorsal and ventral aspects. In three Dutch reservoirs, Petrusplaat, Honderd-en-Dertig and De Gijster the targets of ascending dipteran pupae (Chironomidae, Procladius signatus) with target strength of -74 to -65 dB were observed by vertical beaming. (en)
Title	Hydroacoustic assessment of pelagic stages of freshwater insects. Hydroacoustic assessment of pelagic stages of freshwater insects. (en)
skos:prefLabel	Hydroacoustic assessment of pelagic stages of freshwater insects. Hydroacoustic assessment of pelagic stages of freshwater insects. (en)
skos:notation	RIV/60077387:_____/00:62003028!RIV/2003/AV0/A62003/N
http://linked.open.../vavai/riv/strany	361;366
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA206/97/0072), P(GA206/99/0405), P(IAA6017901), Z(AV0Z6017912)
http://linked.open...iv/cisloPeriodika	13
http://linked.open...vai/riv/dodaniDat	2003
http://linked.open...aciTvurceVysledku	Frouzová, Jaroslava Kubečka, Jan Peterka, Jiří Čech, Martin
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Hydrobiologický ústav AV ČR
http://linked.open...dnocenehoVysledku	712906
http://linked.open...ai/riv/idVysledku	RIV/60077387:_____/00:62003028
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	N/A (en)
http://linked.open.../riv/klicoveSlovo	N/A
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[D4C9D986B16E]
http://linked.open...i/riv/nazevZdroje	Aquatic Living Resources
http://linked.open...in/vavai/riv/obor	DA
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...ocetUcastnikuAkce	0 (xsd:int)
http://linked.open...nichUcastnikuAkce	0 (xsd:int)
http://linked.open...vavai/riv/projekt	Biodiversity of microbial loop ,carbon flow and nutrient cycling in acidified lakes in the Šumava Mountains : pathways and controlling mechanisms Aquatic insects of the Křemená river basin (Šumava Mts.): A case study of long-term environmental effects and stream restoration on biodiversity Acoustic methods for assessment of biotic and abiotic parameters of water environment
http://linked.open...UplatneniVysledku	2000
http://linked.open...v/svazekPeriodika	13
http://linked.open...iv/tvurceVysledku	Kubečka, Jan Peterka, Jiří Čech, Martin Frouzová, Jaroslava Ketelaars, H. A. M. Papáček, M. Wagenwoort, J.
http://linked.open...n/vavai/riv/zamer	Biotické interakce v pelagické zóně lenitických ekosystémů, údolních nádrží a jezer různé trofie v podmínkách výrazného snížení emisí v postkomunistické Evropě
issn	0990-7440
number of pages	6 (xsd:int)

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