Abstract

Historic land changes reflect human pressure in aquatic ecosystems. The value of littoral and riparian zones for lakes is of outmost importance for their hydrology, ecology and support of ecosystem services. The last 75 years altered the landscape mosaic of Lake Pamvotis affecting those habitats. In such an ancient, urban, Mediterranean shallow lake, historic black and white aerial photographs and satellite images were screened in 25 years timestep, from 1945 for extracting land use/land cover changes. The classification took place in two buffer zones (50 m and 500 m). The changes are assessed with respect to their possible impact in water-related ecosystem services. Ecosystem services values were further calculated historically along with landscape ecology indices. The research revealed an extreme landscape makeover until 1995 with detrimental effects in the riparian habitats, with augmented pressure in the 0-50 m buffer. Artificial areas covered 21% in 1995 when in 1945 they occupied only 9%. Total area ecosystem services values rised at the expense of some provisioning and regulating services. As for landscape homogenization and fragmentation, it was already affected by human. Through this research, new ways of studying water bodies can be developed, by following the pressures’ and alterations’ evolution, aiming at better urban and management planning.

摘要

历史上的土地变化反映了人类在水生生态系统中的压力。湖泊沿岸和河岸带的价值对其水文学，生态学和生态系统服务的支持至关重要。过去75年改变了Pamvotis湖的景观马赛克，影响了这些栖息地。在这样一个古老的城市地中海浅水湖中，从1945年开始的25年时间里，筛选了具有历史意义的黑白航拍照片和卫星图像，以提取土地利用/土地覆被变化。分类在两个缓冲区（50 m和500 m）中进行。评估这些变化对与水有关的生态系统服务可能产生的影响。历史上还进一步计算了生态系统服务价值以及景观生态指数。研究表明，直到1995年，极端的景观改造都对河岸生境产生了不利影响，在0-50 m缓冲区增加了压力。1995年，人工区占21％，而1945年仅占9％。总面积生态系统服务价值的增加是以牺牲某些调配和调节服务为代价的。至于景观的同质化和破碎化，已经受到了人类的影响。通过这项研究，可以通过研究压力和变化的演变来开发研究水体的新方法，以更好地进行城市和管理规划。至于景观的同质化和破碎化，已经受到人类的影响。通过这项研究，可以通过研究压力和变化的演变来开发研究水体的新方法，以更好地进行城市和管理规划。至于景观的同质化和破碎化，已经受到了人类的影响。通过这项研究，可以通过研究压力和变化的演变来开发研究水体的新方法，以更好地进行城市和管理规划。