Predatory Filter-Feeding in Fairy Shrimps: Functional Response of Streptocephalus proboscideus (Crustacea: Anostraca) Fed Anuraeopsis fissa (Rotifera)
✍ Scribed by Henri J. Dumont; A. Jawahar Ali; S. S. S. Sarma; J. Mertens
- Book ID
- 102285660
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 436 KB
- Volume
- 79
- Category
- Article
- ISSN
- 1434-2944
No coin nor oath required. For personal study only.
✦ Synopsis
Four size classes of both sexes of laboratory-cultured Srreptocephalus proboscideus (post-metanauplii 4.7f0.4; juvenile virgins 8.7f0.7; adults I 13.8k0.9, and adults I1 22.07+ 1.1 mm) were fed five concentrations (20 to 320 m1-I) of Anuraeopsisflssa. or six concentrations (20 to 640 ml-I) in adults I and adults 11, for 30 minutes. Post-metanauplii consumed at maximum 6 6 f 9 rotifers ind.
min.-' ( m e a n k S . D.) while the largest adult females maximally ingested 347k37 rotifers min.-l.
Regardless of predator size and sex, prey consumption was dependent on prey density. Functional response curves either plateaued or declined at 320 prey ml-* in post-metanauplii, juveniles and adults I, and at 640 m1-l in adults 11. Females consumed c. 40% more prey than males. On a daily basis, adult I1 females consumed up to 1.05 mg rotifer dry weight (10% of their own body weight) while post-metanauplii consumed up to 0.2 mg DW (100% of their body weight). Intermediate stages had intermediate consumption rates. Filtration rates indicated that a fully grown S. proboscideus may filter as much as 2 I of water per day, suggesting that fairy shrimps, in their natural environment, may often be food-limited.