Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

The Ecology and Taxonomy of Epizoic Diatoms on Cladocera

Evelyn E. Gaiser and Roger W. Bachmann
Limnology and Oceanography
Vol. 38, No. 3 (May, 1993), pp. 628-637
Stable URL: http://www.jstor.org/stable/2838037
Page Count: 10
  • More info
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
The Ecology and Taxonomy of Epizoic Diatoms on Cladocera
Preview not available

Abstract

We examined cladocerans from littoral and pelagic zones of 62 north temperate marshes and lakes during four sampling periods to collect and identify epizoic diatoms and correlate their presence and prevalence to limnological characteristics. Forty-nine diatom taxa were found on 20 species of Cladocera. Epizoic diatom assemblages on littoral cladocerans were diverse and contained typical epiphytic taxa. However, a single diatom taxon, Synedra cyclopum, comprised 63% of all epizoic diatoms and was most common on large pelagic Daphnia spp. Thirty-five percent of the study lakes had epizoic diatoms on cladocerans. These spanned a large range of trophic states and geographic regions and differed from lakes without epizoic diatoms by having cladoceran assemblages dominated by Daphnia spp. Prevalences and densities of epizoic diatoms were highest shortly after ice-out when the lakes were not stratified and temperatures were between 10 and $15^\circC$. The seasonality of epizoic diatoms on Cladocera may result from a combination of temperature and nutrient preference of the diatoms and the temperature-dependent cladoceran molt rate. Densities averaged 119 cells per carapace in lakes with epizoic diatoms, with patterns of arrangement on the carapace and the relationship of density with prevalence indicating rapid growth of S. cyclopum on cladocerans. Such growth may represent a burden affecting cladoceran life history and behavior.

Page Thumbnails

  • Thumbnail: Page 
628
    628
  • Thumbnail: Page 
629
    629
  • Thumbnail: Page 
630
    630
  • Thumbnail: Page 
[631]
    [631]
  • Thumbnail: Page 
632
    632
  • Thumbnail: Page 
633
    633
  • Thumbnail: Page 
634
    634
  • Thumbnail: Page 
635
    635
  • Thumbnail: Page 
636
    636
  • Thumbnail: Page 
637
    637