SUBMERGED AQUATIC VEGETATION
; LAKE PONTCHARTRAIN
; SEASONAL GROWTH
; COMPETITION
; LOUISIANA
; ABUNDANCE
; WATER
; BAY
; REPRODUCTION
; SEDIMENT
WOS学科分类:
Plant Sciences
; Marine & Freshwater Biology
WOS研究方向:
Plant Sciences
; Marine & Freshwater Biology
英文摘要:
Submerged macrophyte habitats provide significant benefits to estuarine systems. In southeast Louisiana, Myriophyllum spicatunt L (milfoil) and Ruppia maritime L. (widgeongrass) are dominant species existing across fresh to brackish areas. Though frequently co-occurring across the range of salinity and light conditions, their individual responses to changing environmental conditions from restoration, weather and climate may determine overall species distribution, and biomass abundance. We compared milfoil and widgeongrass growth (i.e., biomass increase) across a range of salinity and light, in monoculture (salinity: 0, 5, 10, 15, 20; light: high (similar to) 50% ambient; low (similar to) 20% ambient), and in mixture (salinity: 0, 10, 20; light: high, low). In monoculture, milfoil growth was reduced at high salinity (20) versus low salinity (0), while biomass allocation differed significantly with greater allocation to shoots under high light, compared to low light. Widgeongrass was minimally affected by salinity, with reduced stem densities at high salinity compared to low salinity. In mixture, both species under yielded compared to monoculture with milfoil reduced with high salinity and light, and low salinity and light; widgeongrass under-yielded with low salinity and high light, and mid salinity (10) and low light. These differences in species' responses suggest that salinity and light contribute to the distribution of milfoil and widgeongrass, with higher salinities and light favoring widgeongrass growth, and lower light possibly decreasing both species' growth, and ultimately, distribution. With continued changes occurring and predicted from both coastal restoration and climate change, understanding drivers of habitat forming species remains critical to inform future landscapes.
1.Louisiana State Univ, Agr Ctr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA 2.Louisiana State Univ, US Geol Survey, Sch Renewable Nat Resources, Agr Ctr,Louisiana Fish & Wildlife Cooperat Res Un, Baton Rouge, LA 70803 USA
Recommended Citation:
Hillmann, Eva R.,La Peyre, Megan K.. Effects of salinity and light on growth and interspecific interactions between Myriophyllum spicatum L. and Ruppia maritima L.[J]. AQUATIC BOTANY,2019-01-01,155:25-31