An investigation of the reproductive ecology of crab's-claw in the Trent River, Ontario, Canada

作者：Weissflog Nicholas^*; Sager Eric

来源：Journal of Aquatic Plant Management, 2016, 54: 72-77.

• control and management
• invasive aquatic macrophyte
• offset
• Stratiotes aloides
• turion

Crab's-claw (Stratiotes aloides L.) is an aquatic macrophyte native to northern Eurasia and often sold in North America in the aquarium and water garden plant trade. In 2008, the first wild crab's-claw population in North America was discovered in the Trent-Severn Waterway in Ontario, Canada. Lack of crucial information on the reproductive ecology of the plant in the invaded habitat is presenting a barrier to effective control and management strategies. Specifically, it is unknown the extent to which the plant is propagating via the production of turions and offsets. Further, the residency time of its turions is also unknown. A field study was completed to evaluate the density and biomass of plants as well as the number and fate of turions and offsets produced by different phenotypic forms of the plant. This was done to identify any potential variability in reproduction between forms in the area of infestation. The submerged phenotype was identified as creating, on average, significantly more turions and offsets than the emergent phenotype. Secondly, experiments were done to understand turion viability and residency times. It was found that turions of crab's-claw do not persist in sediment for longer than 8 to 9 mo; however, it is likely turions last no longer than the period between growing seasons. This may bode well for management as it could be that there is a period in the year where all of the crab's-claw biomass is vulnerable to control.

• 出版日期2016-7