The influence of high waters on stream fish populations in regulated rivers
The influence of high waters on stream fish populations in regulated rivers
复制标题
高水位对管制河流中溪流鱼类种群的影响
作者：
T. Spindler
最初，多瑙河的水文状况是不受管制的，其特点是由于春季阿尔卑斯山的降雪导致河流持续膨胀，导致几周的高水位期。当时，大面积的洪水淹没了沿着主要渠道，发挥了主要作用，作为产卵区的嗜植物鱼类。随后在夏季的几个月里，水位缓慢下降，使成虫、幼虫和幼鱼能够迁移到主要河流或回水中。自1870年以来，这种自然发生的水位波动过程已被人为的调节和渠化大大改变，这导致高水位事件的速度明显增加。举例来说：在1985年8月的高水位期间，维也纳的水位在一天之内从340厘米上升到780厘米，仅持续了4天。这个问题得到了解决，在何种程度上不断变化的水文条件反映在鱼类种群的年级强度。
The hydrological regime of the originally, non-regulated Danube was characterised by a continuous swelling of the river due to snow break in the Alpes in spring time, which resulted in a high-water-period for several weeks. At that time, huge flood areas were inundated along the main channel, which play a major role as spawning areas for phytophilic fish species. The subsequently slow droping of the water levels during the summer months allowed the adults, larvae and juveniles to migrate into the main river or backwaters. Since 1870, this course of natural occurring fluctuations in waterlevels has been considerably altered by man-made regulation and canalization, which lead to a distinct increase of the rapidity of the high water events. For example: during the high water from August 1985, the water level increased within one day from 340 cm up to 780 cm in Vienna, and lasted only for four days. The question was addressed, to which extent the changing hydrological conditions are reflected in year-class strength of the fish populations.