ISSN:
1573-5117
Schlagwort(e):
Ecology
;
Crustacea
;
Copepoda
;
Calanoida
;
Temporary
;
Pond
;
Freshwater
;
Limnology
;
Zooplankton
;
Population
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract An ecological study of the calanoid copepod Diaptomus leptopus under temporary pond conditions was undertaken from March 4 to July 24, 1970, in Windsor, Ontario, Canada. Twice weekly samples were taken from a single station in the pond and among the more important physical-chemical parameters measured were: temperature, precipitation, depth, dissolved oxygen, total alkalinity, total hardness and pH. Initially the desmid Closterium sp. was the dominant phytoplankter but subsequent to May 26, the diatoms, mainly Navicula sp. were most abundant. The dominant zooplankters were the copepods Diaptomus leptopus, Cylcops bicuspidatus thomasi and the cladocerans Daphnia schødleri, Daphnia pulex and Moina recticostris. A positive linear correlation, which was barely significant at the 5% level (r = 0.539) was found between total calanoida and total cladocera. Clutch size in Diaptomus leptopus appeared to decrease with increasing water temperature. A tendency in this species towards suppression of the reproductive activity was associated with increases in the total cladoceran population. Overall metasomal lengths of adult males were less than those reported in the literature. Possible mechanisms of overwintering of this species in the absence of ‘winter eggs’ is discussed briefly.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00014262
Permalink
