CIRCADIAN CHANGES IN FEEDING ACTIVITY AND DIET OF HYDROPSYCHE
SAXONICA MCLACHLAN, 1884

D 2005

CIRCADIAN CHANGES IN FEEDING ACTIVITY AND DIET OF HYDROPSYCHE SAXONICA MCLACHLAN, 1884

TAJMROVÁ, Lenka and Jan HELEŠIC

Basic information

Original name

CIRCADIAN CHANGES IN FEEDING ACTIVITY AND DIET OF HYDROPSYCHE SAXONICA MCLACHLAN, 1884

Name in Czech

Denní potravní aktivita a potrava HYDROPSYCHE SAXONICA MCLACHLAN, 1884

Authors

TAJMROVÁ, Lenka (203 Czech Republic, guarantor) and Jan HELEŠIC (203 Czech Republic)

Edition

1. vyd. Brno, Symposium RIVER BOTTOM VI, Book of abstracts, p. 62-62, 2005

Publisher

Masarykova univerzita v Brně

Other information

Language

English

Type of outcome

Proceedings paper

Field of Study

10600 1.6 Biological sciences

Country of publisher

Czech Republic

Confidentiality degree

is not subject to a state or trade secret

RIV identification code

RIV/00216224:14310/05:00012853

Organization unit

Faculty of Science

Keywords in English

Hydropsyche saxonica; instars; circadian changes; feeding activity; diet

Abstract

ORIG CZ

V originále

Circadian changes in feeding activity and diet of IV and V instar larvae of Hydropsyche saxonica were studied in the Vrbovecký brook (Czech Republic) during one 24-hour period on 22nd and 23rd October 2004. The larvae were hand-picked at 6-hour intervals. The ratio maximum foregut width/head capsule width was used to determine gut fullness. A one-way ANOVA revealed significant differences in gut fullness among V instar larvae collected at different times. Mean value of the ratio was higher for the larvae collected at dusk and at dawn indicating their crepuscular activity. No significant differences were recorded for IV instar larvae. The contents of larval foreguts were analysed using millipore filter technique. There were no differences in gut contents among the V instar or among the IV instar larvae collected at different times. But the difference between gut contents of V instar and IV instar larvae was significant. Amorphous detritus was the most important food source for IV instars whereas V instars fed mainly on animal food

In Czech

Circadian changes in feeding activity and diet of IV and V instar larvae of Hydropsyche saxonica were studied in the Vrbovecký brook (Czech Republic) during one 24-hour period on 22nd and 23rd October 2004. The larvae were hand-picked at 6-hour intervals. The ratio maximum foregut width/head capsule width was used to determine gut fullness. A one-way ANOVA revealed significant differences in gut fullness among V instar larvae collected at different times. Mean value of the ratio was higher for the larvae collected at dusk and at dawn indicating their crepuscular activity. No significant differences were recorded for IV instar larvae. The contents of larval foreguts were analysed using millipore filter technique. There were no differences in gut contents among the V instar or among the IV instar larvae collected at different times. But the difference between gut contents of V instar and IV instar larvae was significant. Amorphous detritus was the most important food source for IV instars whereas V instars fed mainly on animal food

Links

GA206/02/0902, research and development project

Name: Životní strategie meio-makrozoobentosu tekoucích vod

Investor: Czech Science Foundation, Life strategy of stream meio-macroinvertebrates

MSM 143100010, plan (intention)

Name: Časoprostorová dynamika biodiverzity v ekosystémech střední Evropy.

Investor: Ministry of Education, Youth and Sports of the CR, Spatiotemporal biodiversity dynamics in ecosystems of Central Europe

MSM0021622416, plan (intention)

Name: Diverzita biotických společenstev a populací: kauzální analýza variability v prostoru a čase

Investor: Ministry of Education, Youth and Sports of the CR, Diversity of Biotic Communities and Populations: Causal Analysis of variation in space and time

Detailed Information on Publication Record