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- W2183898124 abstract "Ruppia maritima L. (widgeon grass) is one of six species of submerged angiosperms found in Florida Bay. Although R. maritima has the widest salinity tolerance of any submerged angiosperm (Kantrud, 1991), within Florida Bay this species is most common in euryhaline environments of the northern basins near freshwater inflows from the Everglades (Fourqurean et al., 2002). However, populations of R. maritima in these areas are ephemeral and generally display seasonal die-backs (Montague and Ley, 1993). Recovering from seasonal die-backs is thought to require recruitment via seed germination in this species (Kantrud, 1991). Germination in Ruppia spp. is environmentally regulated (Brock, 1982a; Koch and Seeliger, 1988). Koch and Dawes (1991) found that salinity, rather than temperature, is the prime factor in ecotypic variation in R. maritima seed germination between northern and southern populations on the eastern coast of the U.S. and that seeds from Florida had highest germination at lower salinities. Using a statistical model based on field observed water quality and seagrass distribution data, Fourqurean et al. (2003) recently predicted that an increase in seasonal freshwater delivery to Florida Bay, such as that proposed in the Comprehensive Everglades Restoration Program (CERP), would result in an expansion of seagrass beds dominated by euryhaline species such as R. maritima and Halodule wrightii Ascherson. However, there is some concern that the proposed increases in freshwater inflow may, in addition to lowering salinities, also result in an increase in the total nitrogen pool for central and eastern Florida Bay (Rudnick et al., 1999) and have negative consequences for the submerged angiosperms along the northern euryhaline margins of Florida Bay (Lapointe et al., 2002; Lapointe and Barile, 2004). In this study germination of stratified (i.e., cold treatment, otherwise known as vernalization) and unstratified R. maritima seeds from Florida Bay was monitored in response to two salinity manipulations (direct exposure and exposure after incremental increases), two light regimes, and three ammonium treatments. Ammonium levels chosen were based on nutrient concentrations found in northern Florida Bay (Lapointe et al., 2002)." @default.
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- W2183898124 date "2005-01-01" @default.
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- W2183898124 title "THE EFFECT OF SALINITY AND AMMONIUM ON SEED GERMINATION IN RUPPIA MARITIMA FROM FLORIDA BAY" @default.
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