caa a22 4500 445383747 CHVBK 20180317143025.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10021-011-9421-2 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9421-2 Long-Term Effects of Adding Nutrients to an Oligotrophic Coastal Environment [Elektronische Daten] [Anna Armitage, Thomas Frankovich, James Fourqurean] Management of ecological disturbances requires an understanding of the time scale and dynamics of community responses to disturbance events. To characterize long-term seagrass bed responses to nutrient enrichment, we established six study sites in Florida Bay, USA. In 24 plots (0.25m2) at each site, we regularly added nitrogen (N) and phosphorus (P) in a factorial design for 7years. Five of the six sites exhibited strong P limitation. Over the first 2years, P enrichment increased Thalassia testudinum cover in the three most P-limited sites. After 3years, Halodule wrightii began to colonize many of the P-addition plots, but the degree of colonization was variable among sites, possibly due to differences in the supply of viable propagules. Thalassia increased its allocation to aboveground tissue in response to P enrichment; Halodule increased in total biomass but did not appear to change its aboveground: belowground tissue allocation. Nutrient enrichment did not cause macroalgal or epiphytic overgrowth of the seagrass. Nitrogen retention in the study plots was variable but relatively low, whereas phosphorus retention was very high, often exceeding 100% of the P added as fertilizer over the course of our experiments. Phosphorus retentions exceeding 100% may have been facilitated by increases in Thalassia aboveground biomass, which promoted the settlement of suspended particulate matter containing phosphorus. Our study demonstrated that low-intensity press disturbance events such as phosphorus enrichment can initiate a slow, ramped successional process that may alter community structure over many years. Springer Science+Business Media, LLC, 2011 aboveground and belowground biomass nationallicence epiphyte nationallicence eutrophication nationallicence macroalgae nationallicence nutrient nationallicence press nationallicence pulse nationallicence ramp disturbances nationallicence seagrass nationallicence Armitage Anna Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33199, Miami, Florida, USA aut Frankovich Thomas Marine Sciences Program, Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33181, North Miami, Florida, USA aut Fourqurean James Marine Sciences Program, Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33181, North Miami, Florida, USA aut Ecosystems Springer-Verlag 14/3(2011-04-01), 430-444 1432-9840 14:3<430 2011 14 10021 https://doi.org/10.1007/s10021-011-9421-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9421-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Armitage Anna Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33199, Miami, Florida, USA aut NATIONALLICENCE 700 1- Frankovich Thomas Marine Sciences Program, Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33181, North Miami, Florida, USA aut NATIONALLICENCE 700 1- Fourqurean James Marine Sciences Program, Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, 33181, North Miami, Florida, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/3(2011-04-01), 430-444 1432-9840 14:3<430 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer