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Research article - Peer-reviewed, 2022

Responses of bryosphere fauna to drought across a boreal forest chronosequence

Grau-Andres, Roger; Thieffry, Sylvia; Tian, Shanyi; Wardle, David A.; Kardol, Paul

Abstract

Projected changes in precipitation regimes can greatly impact soil biota, which in turn alters key ecosystem functions. In moss-dominated ecosystems, the bryosphere (i.e., the ground moss layer including live and senesced moss) plays a key role in carbon and nutrient cycling, and it hosts high abundances of microfauna (i.e., nematodes and tardigrades) and mesofauna (i.e., mites and springtails). However, we know very little about how bryosphere fauna responds to precipitation, and whether this response changes across environmental gradients. Here, we used a mesocosm experiment to study the effect of volume and frequency of precipitation on the abundance and community composition of functional groups of bryosphere fauna. Hylocomium splendens bryospheres were sampled from a long-term post-fire boreal forest chronosequence in northern Sweden which varies greatly in environmental conditions. We found that reduced precipitation promoted the abundance of total microfauna and of total mesofauna, but impaired predaceous/omnivorous nematodes, and springtails. Generally, bryosphere fauna responded more strongly to precipitation volume than to precipitation frequency. For some faunal functional groups, the effects of precipitation frequency were stronger at reduced precipitation volumes. Context-dependency effects were found for microfauna only: microfauna was more sensitive to precipitation in late-successional forests (i.e., those with lower productivity and soil nutrient availability) than in earlier-successional forests. Our results also suggest that drought-induced changes in trophic interactions and food resources in the bryosphere may increase faunal abundance. Consequently, drier bryospheres that may result from climate change could promote carbon and nutrient turnover from fauna activity, especially in older, less productive forests.

Keywords

Climate change; Mites; Moss; Nematodes; Precipitation

Published in

Oecologia
2022, volume: 200, number: 1, pages: 231-245
Publisher: SPRINGER

Authors' information

Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Thieffry, Sylvia
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Tian, Shanyi
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Tian, Shanyi
Nanjing Agricultural University
Wardle, David A. (Wardle, David)
Nanyang Technological University
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management

UKÄ Subject classification

Ecology

Publication Identifiers

DOI: https://doi.org/10.1007/s00442-022-05255-z

URI (permanent link to this page)

https://res.slu.se/id/publ/119071