Burrowing detritivores regulate nutrient cycling in a desert ecosystem

Nevo Sagi*, José M. Grünzweig, Dror Hawlena

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Nutrient cycling in most terrestrial ecosystems is controlled by moisturedependent decomposer activity. In arid ecosystems, plant litter cycling exceeds rates predicted based on precipitation amounts, suggesting that additional factors are involved. Attempts to reveal these factors have focused on abiotic degradation, soil-litter mixing and alternative moisture sources. Our aim was to explore an additional hypothesis that macro-detritivores control litter cycling in deserts. We quantified the role different organisms play in clearing plant detritus from the desert surface, using litter baskets with different mesh sizes that allow selective entry of micro-, meso- or macrofauna. We also measured soil nutrient concentrations in increasing distances from the burrows of a highly abundant macro-detritivore, the desert isopod Hemilepistus reaumuri. Macro-detritivores controlled the clearing of plant litter in our field site. The highest rates of litter removal were measured during the hot and dry summer when isopod activity peaks and microbial activity is minimal. We also found substantial enrichment of inorganic nitrogen and phosphorous near isopod burrows. We conclude that burrowing macro-detritivores are important regulators of litter cycling in this arid ecosystem, providing a plausible general mechanism that explains the unexpectedly high rates of plant litter cycling in deserts.

Original languageAmerican English
Article number20191647
JournalProceedings of the Royal Society B: Biological Sciences
Volume286
Issue number1914
DOIs
StatePublished - 6 Nov 2019

Bibliographical note

Publisher Copyright:
© 2019 The Authors.

Keywords

  • Above-belowground interactions
  • Desert
  • Dryland decomposition conundrum
  • Litter decomposition
  • Macro-detritivores
  • Terrestrial isopod

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