ISSN:
1573-5117
Keywords:
Berosus styliferus
;
Hydrophilus triangularis
;
Tropisternus lateralis
;
seasonal abundance
;
California
;
rice field
;
population dynamics
;
colonization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Populations of the hydrophilids Berosus styliferus Horn, Hydrophilus triangularis Say, and Tropisternus lateralis (Fabricius) were observed in northern California rice paddies. Relative adult and larval density for each species was determined using aquatic light traps adjacent to the water margin, and at 5 m and 30 m distances from the levee. Egg cases were monitored by recording numbers per unit area. The seasonal patterns of abundance indicate each species has a univoltine life cycle. All stages of B. styliferus and H. triangularis are more abundant nearer the levees. T. lateralis adults are commonly found at the levees during the first 10 weeks post-flood, whereas T. lateralis larvae and egg cases are most numerous at the 30 m distance. Colonication of the paddies occurs through water connections, flight, and adult overwintering.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00006482
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