Organic matter dynamics in a savanna transition riparian zone: Input of plant reproductive parts increases leaf breakdown process

  • Renan S. Rezende | renanrezende30@gmail.com Federal University Rural of Semi-Arid, Program of Postgraduate in Ecology and Conservation, Brazil.
  • Patrícia R.S. Correia State University of Montes Claros, Department of Biology, Brazil.
  • José F. Gonçalves Jr University of Brasilia, Department of Ecology, Brazil.
  • Anderson M. Santos State University of Montes Claros, Department of Biology, Brazil.

Abstract

The dynamics of coarse particulate organic matter (CPOM) drives the functioning of most low order freshwater ecosystems. We evaluated plant litter input, litterfall, leaf litter breakdown rates, and the aquatic invertebrate community over the course of one year in a stream situation in a transition zone between savannah and Atlantic forest. Total organic matter input (litter fall) was 335 g m-2 yr-1, which was mainly composed of leaves (50%). Higher values are found in the transition from dry to rainy season (September and October), probably in response to water stress. The remaining leaf mass (65% on average) was lowest in May (49%) and highest in August (79%). CPOM productivity in this transition riparian zone is higher than in other savannah systems, but lower than in Atlantic forest. The higher leaf litter breakdown in May was likely accompanied by environmental enrichment due to increase in fruits and flowers (high energy resources). The coefficient of decomposition was classified as fast (k= -0.016) and showed a positive relationship with water flow (increase in physical abrasion). Collected invertebrates were classified as 6% shredders and 12% scrapers. The remaining leaf mass showed a negative relationship with scraper abundance, highlighting the importance of these trophic groups in tropical streams. We can conclude that climate factors (e.g., rainfall) directly affect the input and quality of CPOM and, consequently, leaf decomposition in savanna/Atlantic forest transition zones. 

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Author Biographies

Renan S. Rezende, Federal University Rural of Semi-Arid, Program of Postgraduate in Ecology and Conservation
Professor in Ecology Departament
Patrícia R.S. Correia, State University of Montes Claros, Department of Biology
Student in Biology Departament
José F. Gonçalves Jr, University of Brasilia, Department of Ecology
Professor in Ecology Departament
Anderson M. Santos, State University of Montes Claros, Department of Biology
Professor in Biology Departament
Published
2017-06-28
Info
Issue
Section
Original Articles
Supporting Agencies
CNPq, CAPES, FADENOR, FAPEMIG.
Keywords:
Decomposition, input of organic matter, mixing of leaves, scraper, shredders, vertical input.
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How to Cite
1.
Rezende RS, Correia PR, Gonçalves Jr JF, Santos AM. Organic matter dynamics in a savanna transition riparian zone: Input of plant reproductive parts increases leaf breakdown process. J Limnol [Internet]. 2017Jun.28 [cited 2021May18];76(3). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2017.1601