Distribution of submerged macrophytes along environmental gradients in large, shallow Lake Balaton (Hungary)
Distribution of submerged macrophytes along environmental gradients in large, shallow Lake Balaton (Hungary)
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DOI：
10.1016/j.aquabot.2007.12.008
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发表时间：
2008-05-01
期刊：
影响因子：
1.8
通讯作者：
Osztoics, Andras
中科院分区：
文献类型：
--
作者：
Istvanovics, Vera;Honti, Mark;Osztoics, Andras
沉水植物的分布进行了评估，在15个沿岸的网站在大，浅巴拉顿湖使用回声测深技术。立地具有明显的纵向和横向环境梯度。植物的存在/缺失、水深、底部一致性和距海岸的距离已从回声测深数据中得出。从2004年到2006年，在一个单一的地点记录了湍流和气象变量。通过简单的模型估算了水下光照条件（压力指标）和破碎波暴露（干扰指标）的场地特异性变异。光和曝光对植物的影响，可以区分考虑复杂的相互作用的站点特定的形态和随机风场在一个高度简化的方式。不像在风保护的北方沿岸的，波浪扰动限制了植物的分布沿着近海部分的近水平的南部高原。由于长（在几公里的顺序）取在主导风的方向，建立一个大型植物为主的稳定状态，只能预计在局部范围内，尽管浅的平均深度的巴拉顿湖。植物的相对频率是最高的，在相同的底部一致性在泥泞的北方和桑迪南部沿岸的。在北方海岸的沿着，沉水植物对相对坚实的底部的偏好可以被证明。观察到的模式表明，偏好不是由养分供应。(c)2008 Elsevier B. V.保留所有权利。
Distribution of submerged macrophytes was assessed at 15 littoral sites in large, shallow Lake Balaton using the echo sounding technique. Sites represented the conspicuous longitudinal and transverse environmental gradients. Absence/presence of plants, water depth, bottom consistency and distance from the shore have been derived from echo sounding data. Turbidity and meteorological variables were recorded at a single site from 2004 to 2006. Site-specific variability in underwater light conditions (an indicator of stress) and exposure to breaking waves (an indicator of disturbance) were estimated by simple models.Light deficiency was the prime factor that determined the distribution and colonization depth of submerged macrophytes. The influence of light and exposure on plants could be distinguished by considering the complex interplay of site-specific morphometry and the stochastic wind field in a highly simplified manner. Unlike in the wind protected northern littoral, wave disturbance limited the distribution of plants along the offshore portion of the nearly horizontal southern plateau. Due to the long (in the order of several kilometres) fetch in the direction of the dominant winds, establishment of a macrophyte dominated stable state can only be expected at a local scale in spite of the shallow mean depth of Lake Balaton.Relative frequency of plants was the highest at the same bottom consistency in both the muddy northern and the sandy southern littoral. Preference of submerged macrophytes towards relatively firm bottoms could be demonstrated along the northern shore. The observed pattern suggested that preference was not driven by nutrient availability. (c) 2008 Elsevier B.V. All rights reserved.