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Factors influencing the abundance of Japanese encephalitis vectors in ricefields in India--II. Biotic.
- Source :
-
Medical and veterinary entomology [Med Vet Entomol] 2002 Mar; Vol. 16 (1), pp. 1-9. - Publication Year :
- 2002
-
Abstract
- The relationship of insect predators and phytoplankton with the abundance of Culex tritaeniorhynchus Giles, Cx. vishnui Theobald and Cx. pseudovishnui Colless mosquito larvae and pupae (Diptera: Culicidae) in ricefields was investigated during three rice growing seasons. Notonectids were the most abundant insect predators, whereas diatoms dominated among phytoplankton. Multiple regression analysis showed that the occurrence of notonectids (both nymphs and adults) was negatively associated with larval abundance. Phytoplankton, especially diatoms and blue green algae (BGA), were found to favour abundance of culicine immatures during Navarai and Kuruvai crops, respectively. Larval gut analysis showed that the intake of algae by late instars was high, with 93%, 58% and 24% of diatoms, BGA and green algae, respectively. Filamentous algae may not necessarily be of nutritive value, but they are observed to form mats, which provide protection to the mosquito immatures from the predators.
- Subjects :
- Animals
Chlorophyta growth & development
Crops, Agricultural
Cyanobacteria growth & development
Diatoms growth & development
Ecosystem
Encephalitis, Japanese epidemiology
Humans
India
Oryza
Population Dynamics
Regression Analysis
Seasons
Water
Culex growth & development
Encephalitis, Japanese transmission
Insect Vectors growth & development
Insecta physiology
Phytoplankton physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0269-283X
- Volume :
- 16
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Medical and veterinary entomology
- Publication Type :
- Academic Journal
- Accession number :
- 11963972
- Full Text :
- https://doi.org/10.1046/j.1365-2915.2002.00325.x