Description of Benthic Communities in Karst, Spring-Fed Streams of North Central Florida
Description of Benthic Communities in Karst, Spring-Fed Streams of North Central Florida
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佛罗里达州中北部喀斯特、泉水溪流中底栖群落的描述
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通讯作者：
R. W. Hull
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作者：
Robert A. Mattson;J. H. Epler;Michael K. Hein3;J. C. G. L. F. Rosenau;C. W. Hendry;R. W. Hull
：佛罗里达州中北部以喀斯特地质为主，形成了众多泉水和受泉水影响的溪流。这些系统由区域含水层系统供水；佛罗里达含水层。受泉水影响的河流系统的附生生物群落，例如苏旺尼河下游和圣达菲河下游，其特征是藻类群落，通常以硅藻为主（占类群列表的 73%）。沉水性水生植被 (SAV) 床在受泉水影响的河流系统中很常见，主要是大型藻类（主要是轮藻属）和维管植物（慈姑、美洲苦草等）。木质基质上的底栖无脊椎动物群落以摇蚊目、蜉蝣目和毛翅目为主（根据 Hester-Dendy 采样器的数据表明），腹足类软体动物和甲壳类动物（主要是端足类 Hyalella azteca）偶尔也相对丰富。沙质基质以摇蚊类、腹足类、双壳类软体动物和寡毛类动物为主。我们的数据表明，与软底群落相比，与硬质底质（例如木材和石灰岩浅滩）相关的物种更丰富的群落。 SAV 上的附生无脊椎动物群落以摇蚊类和蜉蝣类为主。春季影响是佛罗里达州中北部河流系统的主要结构力量。底栖无脊椎动物物种丰富度的增加
: North-central Florida is dominated by a karst geology which gives rise to numerous springs and spring-influenced streams. These systems are fed by a regional aquifer system; the Floridan Aquifer. The periphyton communities of spring-influenced stream systems, such as the lower Suwannee and lower Santa Fe rivers, are characterized by an algal community typically dominated by diatoms (comprising 73% of the taxa list). Beds of submergent aquatic vegetation (SAV) are common in spring-influenced stream systems, dominated by macroalgae (primarily Chara spp.) and vascular plants (Sagittaria kurziana, Vallisneria americana, and others). Benthic invertebrate communities are dominated by chironomids, Ephemeroptera and Trichoptera on woody substrata (as suggested by data from Hester-Dendy samplers), with gastropod molluscs and crustaceans (primarily the amphipod Hyalella azteca) occasionally being relatively abundant. Sandy substrata are dominated by chironomids, gastropod and bivalve molluscs and oligochaetes. Our data indicate that a more species rich community is associated with hard substrata (such as wood and limestone shoals) than with soft-bottom communities. Epiphytic invertebrate communities on SAV are dominated by chironomids and ephemeropterans. Spring influ ence is a major structuring force in stream systems in north-central Florida. Increases in benthic invertebrate species richness and