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

历史性的土地变化反映了人类对水生生态系统的压力。湖泊沿岸和河岸带的价值对于湖泊的水文、生态和生态系统服务支持至关重要。过去 75 年改变了影响这些栖息地的帕姆沃蒂斯湖的景观镶嵌。在这样一个古老的、城市的、地中海浅湖中，从 1945 年开始，以 25 年的时间步长筛选了历史性的黑白航空照片和卫星图像，以提取土地利用/土地覆盖变化。分类发生在两个缓冲区（50 m 和 500 m）。评估这些变化对与水相关的生态系统服务可能产生的影响。生态系统服务价值与景观生态指数一起在历史上进一步计算。研究揭示了 1995 年之前的极端景观改造，对河岸栖息地产生了不利影响，0-50 m 缓冲区的压力增加。1995 年人工面积占 21%，而 1945 年仅占 9%。总面积生态系统服务价值的上升是以牺牲一些供应和调节服务为代价的。至于景观的同质化和破碎化，已经受到了人为的影响。通过这项研究，可以开发研究水体的新方法，跟踪压力和变化的演变，旨在更好地进行城市和管理规划。至于景观的同质化和破碎化，已经受到了人为的影响。通过这项研究，可以开发研究水体的新方法，跟踪压力和变化的演变，旨在更好地进行城市和管理规划。至于景观的同质化和破碎化，已经受到了人为的影响。通过这项研究，可以开发研究水体的新方法，跟踪压力和变化的演变，旨在更好地进行城市和管理规划。