Combined effects of temperature and algal density on the life history characteristics in Brachionus angularis and Keratella Valga

Temperature and food density are the most important factors influencing the population dynamics of rotifers. In the present study, the effects of temperature and food concentration on the developmental durations, egg ratio, and life-table demography in Brachionus angularis and Keratella valga were s...

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Bibliographic Details
Published in:Journal of freshwater ecology 2022-12, Vol.37 (1), p.513-523
Main Authors: Xu, Xiao-Ping, Tao, Kai-Yan, Yang, Xiao-Fan, Li, Bin-Bin, Zhao, Chang-Shuang, Guo, Yu-Hu
Format: Article
Language:English
Subjects:
Algae
Aquaculture
Brachionus angularis
Cell culture
Demography
Density
Eggs
Embryogenesis
Embryonic development
Embryonic growth stage
Fish
Fish culture
Fish eggs
Fish larvae
Food
food density
Foods
Freshwater
Freshwater aquaculture
Freshwater fish
Hatching
Inland water environment
Juveniles
Keratella valga
Larvae
Life expectancy
Life history
Life span
Marine invertebrates
Mass culture
Polyculture (aquaculture)
Population dynamics
Prey
rotifer
Temperature
Temperature effects
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Summary:Temperature and food density are the most important factors influencing the population dynamics of rotifers. In the present study, the effects of temperature and food concentration on the developmental durations, egg ratio, and life-table demography in Brachionus angularis and Keratella valga were studied at four temperatures (15 °C, 20 °C, 25 °C and 30 °C) and four food levels (0.5 × 10 6 , 1.0 × 10 6 , 2.0 × 10 6 and 3.0 × 10 6 cells/mL Scenedesmus obliquus). The results showed significant effects of both temperature and food concentration, independently and interactively on the embryonic development (ED), juvenile period (JP), average lifespan (LS), generation time (T) and intrinsic rate of population increase (r m ) in B. angularis, while the ED, life expectancy at hatching (e 0 ), LS, T and r m in K. valga. In all conditions, the number of eggs per female and r m in B. angularis were higher than those in K. valga. These results suggested that B. angularis might be more suitable to mass culture in aquaculture than K. valga, and a potential prey for fish larvae in freshwater aquaculture.
ISSN:0270-5060
2156-6941
DOI:10.1080/02705060.2022.2124322