The productivity and carbon budget of a natural population of Daphnia lumholtzi Sars |
| |
Authors: | C R King J G Greenwood |
| |
Institution: | (1) School of Life Science, Queensland University of Technology, 4001 Brisbane, Qld, Australia;(2) Department of Zoology, University of Queensland, 4067 St Lucia, Qld, Australia |
| |
Abstract: | D. lumholtzi in Lake Samsonvale, Queensland, Australia, is a small species (max. size approx. 7 µgC) 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–1 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. |
| |
Keywords: | Daphnia lumholtzi production carbon budget seasonality |
本文献已被 SpringerLink 等数据库收录! |
|