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.

Importance of Detrital Algae, Bacteria, and Organic Matter to Littoral Microcrustacean Growth and Reproduction

A. Maria Lemke, Michael J. Lemke and Arthur C. Benke
Limnology and Oceanography
Vol. 52, No. 5 (Sep., 2007), pp. 2164-2176
Stable URL: http://www.jstor.org/stable/4502366
Page Count: 13
  • More info
  • Cite this Item
Importance of Detrital Algae, Bacteria, and Organic Matter to Littoral Microcrustacean Growth and Reproduction
Preview not available

Abstract

Cumulative incorporation of radiolabeled algal (NaH14CO3) and bacterial ($^{14}C-acetate$) carbon associated with benthic organic matter (BOM) was measured at timed intervals to determine the relative importance of algal, bacterial, and detrital components of BOM to the growth and reproduction of Eurycercus vernalis (Chydoridae). Five times more algal than bacterial carbon was incorporated, which corresponded to relative amounts of algal and bacterial carbon quantified from the BOM. Algal and bacterial carbon provided 38% and 8% of the carbon required for Eurycercus growth and reproduction, respectively. Approximately 54% of the carbon required for Eurycercus growth was presumably provided by nonlabeled microbes (e.g., fungi, protists) or detritus. Parallel studies were conducted to measure the growth and reproduction for Eurycercus fed diets varying in amounts of algae, bacteria, and detritus. Effects of diet were especially noticeable in early instar growth and reproduction. Individuals fed diets with high algal and bacterial biomass relative to detrital content exhibited higher maximum somatic growth rates ($75-89% d^{-1}$) than those fed aggregate and particulate detritus (51-60%). Egg production and net reproductive rate were highest for females fed nutrient-supplemented algae and corresponded to increased survivorship, early reproduction, and larger clutches. Survivorship was highest for females fed aggregate detritus; however, the percentage of total growth allocated toward egg production was similar for individuals fed aggregate detritus and cultured algae (67-82%). Relative trophic importance of algae and bacteria as constituents of BOM likely depends on their relative abundance, but the two in combination can be substantially more important than the detritus alone.

Page Thumbnails

  • Thumbnail: Page 
2164
    2164
  • Thumbnail: Page 
2165
    2165
  • Thumbnail: Page 
2166
    2166
  • Thumbnail: Page 
2167
    2167
  • Thumbnail: Page 
2168
    2168
  • Thumbnail: Page 
2169
    2169
  • Thumbnail: Page 
2170
    2170
  • Thumbnail: Page 
2171
    2171
  • Thumbnail: Page 
2172
    2172
  • Thumbnail: Page 
2173
    2173
  • Thumbnail: Page 
2174
    2174
  • Thumbnail: Page 
2175
    2175
  • Thumbnail: Page 
2176
    2176