The productivity and carbon budget of a natural population ofDaphnia lumholtziSars

✍ Scribed by C. R. King; J. G. Greenwood

• Publisher: Springer
• Year: 1992
• Tongue: English
• Weight: 870 KB
• Volume: 231
• Category: Article
• ISSN: 1573-5141
• DOI: 10.1007/bf00018203

✦ Synopsis

D . lumholtzi in Lake Samsonvale, Queensland, Australia, is a small species (max. size approx . 7 tgC) that occurs in low abundance (max . abundance 6400 m -3 ), with an average daily biomass of 3.32 mgC m -3 . Its annual rates of carbon assimilation, production and respiration, are 166, 110, and 56 mgC m -3 y -' respectively . Annual biomass turnover (annual production/average daily biomass) is 33 and production efficiency is 50-66% . The population may consume 1 .65-2 .20 mgC m -3 daily, equivalent to about 1 ° of the average daily standing crop of phytoplankton . Clutch size is small, 2 eggs, but represents 30-80% of a female's weight . A female may only produce 8-10 offspring in a full lifespan, nevertheless egg production may account for 56% of total production . The population shows autumn and spring peaks in abundance, and is believed to oversummer (4 months) as ephippia .