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

TAJMROVÁ, Lenka and Jan HELEŠIC. CIRCADIAN CHANGES IN FEEDING ACTIVITY AND DIET OF HYDROPSYCHE SAXONICA MCLACHLAN, 1884. In Symposium RIVER BOTTOM VI, Book of abstracts. 1st ed. Brno: Masarykova univerzita v Brně, 2005, p. 62.

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

• Original 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
• Tags: circadian changes, diet, feeding activity, Hydropsyche saxonica, instars
• Tags: International impact

Abstract

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

Abstract (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