EFFECTS OF NITROGEN AVAILABILITY AND HERBIVORY ON EELGRASS (ZOSTERA MARINA) AND EPIPHYTES
EFFECTS OF NITROGEN AVAILABILITY AND HERBIVORY ON EELGRASS (ZOSTERA MARINA) AND EPIPHYTES
复制标题
氮素有效性和草食性对鳗草（大叶藻）和附生植物的影响
DOI：
--
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
M. Ruckelshaus
中科院分区：
文献类型：
--
作者：
Susan L. Williams;M. Ruckelshaus
尽管大叶藻的生长受到资源以及与附生植物及其食草动物的高阶相互作用的控制，但这些约束很少被一起考虑。利用水柱和沉积物营养源在一个复杂的栖息地的能力，可以提供与附生植物，具有更有效的吸收动力学，可以减少鳗鱼草生长，特别是在富营养化的栖息地的营养竞争的部分释放。我们调查了溶解无机氮在水柱与沉积物的相对影响，和草食动物的共同等足类Idotea resecata，在帕迪利亚湾，华盛顿的潮间带的海藻床海藻生长和附生植物生物量。在现场，我们施肥的沉积物和/或水柱与铵和测量海藻的生长和附生植物的生物量。我们还监测了附生植物的生物量、水体营养盐浓度和等足类密度。实验室研究了I.切除、水体和沉积物的肥化以及沉积物营养物对鳗草生长和附生植物生物量的消耗。最简单的是，我们假设，附生植物会积极响应增加水柱养分的水草会增加沉积物养分，并对附生植物的食草动物可以减轻有害影响的附生植物上的水草。我们表明，影响鳗鱼草生长的沉积物氮资源和更高层次的影响真菌和Idotea resecata控制。在我们的田间试验中，对泥沙的响应，
Although the growth of eelgrass (Zostera marina) is controlled by resources as well as higher order interactions with epiphytes and their herbivores, these constraints rarely are considered together. The ability to utilize both water column and sediment nutrient sources in a complex habitat may provide eelgrass with a partial release from nutrient competition with epiphytes that have more efficient uptake kinetics and can reduce eelgrass growth, particularly in eutrophic habitats. We investigated the relative effects of dissolved inorganic nitrogen in the water column vs. the sediments, and herbivory by the common isopod Idotea resecata, on eelgrass growth and epiphyte biomass in an intertidal eelgrass bed in Padilla Bay, Washington. In the field, we fertilized the sediments and/or the water column with ammonium and measured eelgrass growth and epiphyte biomass. We also monitored epiphyte biomass and water column nutrient concentrations and cen- sused isopod densities. Laboratory experiments focused on the effects of I. resecata, fer- tilization of the water column and sediments, and depletion of sediment nutrients on eelgrass growth and epiphyte biomass. Most simply, we hypothesized that epiphytes would respond positively to increased water column nutrients as eelgrass would to increased sediment nutrients, and that herbivory on epiphytes could mitigate deleterious effects of epiphytes on eelgrass. We demonstrated that eelgrass growth is affected both by sediment nitrogen resources and the higher order effects of epiphytes and their control by Idotea resecata. During our field experiments, growth of eelgrass leaves tended to increase in response to sediment