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Effects of antecedent drying events on structure, composition and functional traits of invertebrate assemblages and leaf-litter breakdown in a former perennial river of Central Apennines (Aterno River, Abruzzo, Central Italy)
Ecohydrology ( IF 2.6 ) Pub Date : 2021-09-20 , DOI: 10.1002/eco.2358
Antonio Di Sabatino 1 , Luca Coscieme 2 , Giovanni Cristiano 1
Affiliation  

Because of global change and increasing anthropogenic pressures, non-perennial rivers and streams are predicted to drastically increase in the European-Mediterranean region. Some river basins already subject to reduced levels of available superficial flow may present a further reduction, with a significant increase in intermittence phenomena and complete drought of former perennial rivers. In this context, a sound knowledge of the ecological effects of increasing drying events on these watercourses may help to better predict impacts of the altered flow regime on structure and functions of freshwater ecosystems. In this paper, we assessed the long-term response of invertebrate assemblages and ecosystems processes to antecedent drying events (drying memory) in a Central Apennine river (Italy). We demonstrated that compared to the perennial reach, the 7-km downstream intermittent site, after more than 1 year from a complete superficial flow resumption, still conserved the ‘memory’ of past disturbance with marked differences in structure, composition and functional traits of assemblages which, in turn, negatively influenced the leaf-litter breakdown process. Despite total abundance and taxa richness were on average higher at the intermittent site, antecedent droughts determined a decline of shredders and scrapers and an increase of collectors. In addition, some more sensible, semivoltine and rheophile taxa were replaced by generalist, multivoltine and more resistant taxa. Our findings confirm and extend the ‘drying memory’ hypothesis and suggest that irregular drying events in former perennial Apennine rivers may have dramatic long-term effects on both structure and functions of lotic ecosystems.

中文翻译:

先前干燥事件对中亚平宁山脉前常年河流(意大利中部阿布鲁佐阿特诺河)无脊椎动物群落结构、组成和功能特征以及落叶分解的影响

由于全球变化和日益增加的人为压力,预计欧洲-地中海地区的非常年河流和溪流将急剧增加。一些已经受到可用表层流量减少的流域可能会进一步减少,间歇现象显着增加,以前常年河流完全干旱。在这种情况下,对这些水道上越来越多的干旱事件的生态影响的充分了解可能有助于更好地预测改变的流态对淡水生态系统结构和功能的影响。在本文中,我们评估了无脊椎动物组合和生态系统过程对亚平宁中部河流(意大利)先前的干燥事件(干燥记忆)的长期响应。我们证明,与常年覆盖范围相比,下游 7 公里的间歇性站点,在完全恢复表面流动一年多后,仍然保留了过去干扰的“记忆”,组合的结构、组成和功能特征存在显着差异,这反过来又对叶片产生了负面影响-垃圾分解过程。尽管间歇性地点的总丰度和类群丰富度平均较高,但先前的干旱决定了碎纸机和刮板机的减少以及收集器的增加。此外,一些更敏感的半化生和嗜热类群被多面性和抗性更强的类群所取代。
更新日期:2021-09-20
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