A comparison of phytal substrate preferences of Archaias angulatus and Sorites orbiculus in mixed macroalgal-seagrass beds in Florida Bay
A comparison of phytal substrate preferences of Archaias angulatus and Sorites orbiculus in mixed macroalgal-seagrass beds in Florida Bay
复制标题
佛罗里达湾大型藻-海草混合床中古藻和 Sorites Orbiculus 植物基质偏好的比较
DOI：
10.2113/gsjfr.29.2.143
复制
发表时间：
1999
影响因子：
1.1
通讯作者：
P. Hallock
中科院分区：
文献类型：
--
作者：
K. Fujita;P. Hallock
在佛罗里达湾附近的长礁混合macroalgalseagrass床的附生有孔虫，特别是Archaias angulatus和Sorites orbiculus的栖息地偏好进行了研究。采集了10种不同生长形态的常见植物。在所有10个大型植物基板，有孔虫属于顺序miliolida至少75%的有孔虫组合，与较小的miliolids占30和60%之间的组合。古菌angulatus组成的10个基板上的7个组合的30%以上。较小的粟粒和A. angulatus最丰富的缠绕或附生的大型藻类，这表明这种基质提供了最佳的三维栖息地，从水的运动庇护，但提供丰富的食物和光资源。孢子菌orbiculus是目前所有的大型植物基板，但负责超过5%的组合，只有三个，特别是两种海草检查和红藻Laurencia intertricata。S. orbiculus似乎更喜欢植物基质的平坦裸露表面，例如海草Thalassia testudinum的叶片，它可以半永久性地粘附在其上。生境选择A. angulatus和S. orbiculus提供了深入了解记录下降共生轴承Soritidae相对较小Miliolidae在佛罗里达键沉积物。近岸沃茨的人为营养化正在促进海草和大型藻类上的附生藻类生长。附生生长可阻止S.一旦附着，圆形幼体或窒息个体。a.本可从附生生长中获益的angulatus种群不能耐受有机物生产过剩增加底栖需氧量时造成的间歇性缺氧。
Habitat preferences of epiphytic foraminifers, particularly Archaias angulatus and Sorites orbiculus, were studied in a mixed macroalgalseagrass bed in Florida Bay near Long Key. Ten common plant species with different growth forms were sampled. On all ten macrophytal substrates, foraminifers belonging to the Order Miliolida made up at least 75% of the foraminiferal assemblage, with smaller miliolids accounting for between 30 and 60% of the assemblages. Archaias angulatus composed more than 30% of the assemblage on seven of the ten substrates. The smaller miliolids and A. angulatus were most abundant on entangled or epiphytized macroalgae, indicating that such substrate provides optimal three-dimensional habitats that are sheltered from water motion, yet provide abundant food and light resources. Sorites orbiculus was present on all macrophytal substrates, but was responsible for more than 5% of the assemblage on only three, notably both species of seagrass examined and on the rhodophyte Laurencia intricata. S. orbiculus appears to prefer flat, bare surfaces of phytal substrates such as blades of the seagrass Thalassia testudinum, to which it may semi-permanently adhere. Habitat preferences of A. angulatus and S. orbiculus provide insight into the documented decline of symbiont-bearing Soritidae relative to smaller Miliolidae in Florida Keys sediments. Anthropogenic nutrification of nearshore waters is promoting epiphytic algal growth on seagrasses and macroalgae. Epiphytic growth may deter attachment of S. orbiculus juveniles or smother individuals once attached. A. angulatus populations, which might otherwise benefit from the epiphytic growth, are intolerant of episodic anoxia that results when overproduction of organic matter increases benthic oxygen demand.