A preliminary evaluation of lake morphometric traits influence on the maximum growing depth of macrophytes

  • Mattia M. Azzella University La Sapienza, Italy.
  • Rossano Bolpagni | rossano.bolpagni@unipr.it Parma University, Italy.
  • Alessandro Oggioni CNR-IREA Milan, Italy.

Abstract

Underwater light regime is widely considered the principal determinant of aquatic plant depth distribution. The majority of previous studies dealing with macrophytes in lakes have singled out Secchi disk transparency (SD) values as the key empirical proxy to explain the maximum depth of macrophyte colonization (Zc). Few studies have investigated the role played by lake morphometry in structuring macrophyte beds. Using a balanced dataset including 20 Italian lakes (10 shallow and 10 deep lakes), we analysed transparency and lake morphometric traits to investigate their possible effects on Zc. Our results demonstrate that lake area plays a significant role, and confirm a direct influence of SD values on Zc. Considering lakes with an equal degree of transparency, smaller lakes may yield a lower Zc than larger ones. Morphology has a great influence on lake ecological characteristics especially on water thermal conditions and mixing depth. Based on our data, we argue that the thermal stratification plays a non negligible role in explaining macrophytes zonation, due to its influence on macrophytes life cycles and phytoplankton vertical distribution. Therefore, the present data suggest the need to enhance and refine our knowledge about the relationship between aquatic plants distribution and lake thermal conditions to better model the response of macrophytes to climate change and eutrophication.

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Author Biography

Rossano Bolpagni, Parma University
Department of Life Sciences, Research assistant
Published
2014-03-24
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Supporting Agencies
Lombardy Regional Agency for Environmental Protection, Provincial Agency for Environmental Protection of Trento
Keywords:
Submerged aquatic plants, maximum growing depth, Secchi disk, lake area, littoral slope
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How to Cite
1.
Azzella MM, Bolpagni R, Oggioni A. A preliminary evaluation of lake morphometric traits influence on the maximum growing depth of macrophytes. J Limnol [Internet]. 2014Mar.24 [cited 2020Jul.14];73(2). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2014.932

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