The annual and seasonal successions of larvae and imagines of water beetles in a shallow, man-made lake in Northern Sweden
Title:
The annual and seasonal successions of larvae and imagines of water beetles in a shallow, man-made lake in Northern Sweden
Author:
Nilsson, Anders N. Danell, Kjell
Appeared in:
Aquatic insects
Paging:
Volume 3 (1981) nr. 4 pages 233-243
Year:
1981
Contents:
Four years after the reflooding of a shallow, man-made lake in the coastal region of northern Sweden the water beetle fauna was studied over a 5-year period. Samples were taken at regular intervals using emergence traps, a sweep net and a Rzoska core sampler. Altogether 28 different species were found, 23 of which belonged to the Dytiscidae. A certain seasonal sequence in the larval stages of the most abundant species was observed. Early in summer larvae of Colymbetes striatus and Agabus fuscipennis were present, and those of A. serricornis, Rhantus exsoletus and Graphoderus zonatus at midsummer, while larvae of Hygrotus inaequalis and Ilybius subaeneus were found almost exclusively during the late summer. Larvae of Coelambus impressopunctatus occurred over a longer period of time. During the 5-year study period the values for species number, diversity and evenness all increased. As the lake increased in age, so did habitat complexity, mainly in connection with the development of the plant community of submerse macrophytes.
Journal description