caa a22 4500 445893982 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0607-6 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0607-6 Influences of water column nutrient loading on growth characteristics of the invasive aquatic macrophyte Myriophyllum aquaticum (Vell.) Verdc [Elektronische Daten] [Ryan Wersal, John Madsen] Nuisance growth of Myriophyllum aquaticum has often been attributed to high amounts of nutrients. The uptake of nitrogen and phosphorus from sediments and their allocation have been documented in both natural and laboratory populations. However, nutrient loading to surface water is increasingly becoming an important issue for water quality standards. Aquatic macrophytes that develop adventitious roots may be able to survive through the uptake of water column nutrients. Our objectives for this study were to assess M. aquaticum growth when combinations of nitrogen and phosphorus were added to the water column. Mesocosm experiments were conducted where nitrogen (1.8, 0.8, and 0.4mgl−1; high, medium, and low) and phosphorus (0.09, 0.03, 0.01mgl−1; high, medium, and low) concentrations were paired and added to the water column. After 12weeks, the combination of 1.80:0.01N:P resulted in greater (P<0.01) total biomass and greater biomass for all plant tissues. Total biomass at the 1.80:0.01N:P combination was 53% greater than biomass at all other combinations. The yield response of M. aquaticum was a quadratic function of tissue nutrient content. Yield was positively (r 2=0.82) related to increasing nitrogen content, whereas a negative (r 2=0.89) relationship was determined for increasing phosphorus content. We propose the negative relationship is due to increased nutrient competition and shading by algae resulting in reduced M. aquaticum growth. Tissue nutrient content indicated that critical concentrations (1.8% nitrogen and 0.2% phosphorus) for growth were not attained except for nitrogen in plants grown in the 1.80:0.01N:P combination. These data provide further evidence that M. aquaticum requires high levels of nitrogen to achieve nuisance growth. Survival through uptake of water column nutrients may be a mechanism for survival during adverse conditions, a means of long distance dispersal of fragments, or may offer a competitive advantage over species that rely on sediment nutrients. Springer Science+Business Media B.V., 2011 Nitrogen nationallicence Phosphorus nationallicence Aquatic plant nationallicence Parrotfeather nationallicence Non-native nationallicence Exotic nationallicence Wersal Ryan Geosystems Research Institute, Mississippi State University, Box 9627, 39762-9627, Starkville, MS, USA aut Madsen John Geosystems Research Institute, Mississippi State University, Box 9627, 39762-9627, Starkville, MS, USA aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 93-105 0018-8158 665:1<93 2011 665 10750 https://doi.org/10.1007/s10750-011-0607-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0607-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wersal Ryan Geosystems Research Institute, Mississippi State University, Box 9627, 39762-9627, Starkville, MS, USA aut NATIONALLICENCE 700 1- Madsen John Geosystems Research Institute, Mississippi State University, Box 9627, 39762-9627, Starkville, MS, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 93-105 0018-8158 665:1<93 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer