PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS

K. Rogers, W. Ellery, N. L. Winternitz, R. Dohmeier
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引用次数: 2

Abstract

SUMMARY The classification of highveld pans by Geldenhuys (1982) emphasized the spatial diversity of morphology, vegetation and fauna. However, since the characteristics of individual pans also change seasonally and over longer term wet/dry cycles, he called for more detailed limnological studies to improve predictive and management potential. Marked changes occurred in the physical, chemical and biological characteristics of Rolfes pan in response to winter drawdown following dry (1983) and wet (1986) summers. The constancy of physical and chemical conditions during 1986 contrasted with rapid changes in temperature, turbidity, conductivity and salinity as benthic plants disappeared in 1983. The abundance of emergent vegetation provided breeding sites for certain wetland birds in 1986 but shallow water and submerged plants attracted wading birds in 1983. Changes within and between years highlighted the importance of three distinctive limnological characteristics of pans; large surface area to volume ratio...
夏季干湿交替后,高原区水体深度下降的物理、化学和生物反应
Geldenhuys(1982)对高原平原的分类强调形态、植被和动物的空间多样性。然而,由于个别湖泊的特征也随季节和长期干湿循环而变化,他呼吁进行更详细的湖泊学研究,以提高预测和管理潜力。旱夏(1983年)和湿夏(1986年)后的冬季,罗氏潘的物理、化学和生物特性发生了显著变化。随着1983年底栖植物的消失,1986年的物理和化学条件的稳定与温度、浊度、电导率和盐度的快速变化形成了对比。1986年,大量的新兴植被为某些湿地鸟类提供了繁殖地,但1983年,浅水和淹没植物吸引了涉水鸟类。年内和年间的变化突出了三种不同湖泊特征的重要性;表面积体积比大…
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