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Control of turion germination in Potamogeton crispus
Jian, Y.; Li, B.; Wang, J.; Chen, J. (2003). Control of turion germination in Potamogeton crispus. Aquat. Bot. 75(1): 59-69. dx.doi.org/10.1016/s0304-3770(02)00165-1
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Germination; Herbivores; Light absorption; Light attenuation; Predation; Substrate preferences; Turions; Water depth; Potamogeton crispus L. [WoRMS]; China, People's Rep., Hubei Prov.; Fresh water

Authors  Top 
  • Jian, Y.
  • Li, B.
  • Wang, J.
  • Chen, J., correspondent

Abstract
    Potamogeton crispus is a cosmopolitan aquatic species occurring in a wide range of climatic habitats. The effects of water depth, light availability, substrate type and simulated predation (by removing germinated sprouts) on turion germination of P. crispus were monitored from 1999 to 2000 under field conditions in Hubei province, China. The germination rate of the turions decreased at a mean rate 0.05 m-1 per day with increasing water depth irrespective of lake. There were significant negative linear relationships between germination rate and water depth both of the same lake and across the lakes. Turion germination was inhibited in the dark, but was little affected by types of substrate. Removing the germinated sprouts promoted germination of other dormant buds. Therefore, the potential to germinate further after sprout removal might be one mechanism by which P. crispus can dominate habitats with predation pressure from herbivorous fishes. The results may be used to predict turion germination dynamics of P. crispus from water depth of lakes providing light attenuation does not change, and to construct a population model.

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