Mycelial responses of the soil fungus, Mortierella isabellina, to grazing by Onychiurus armatus (collembola)

Hedlund, Katarina; Boddy, Lynne; Preston, Christine

doi:10.1016/0038-0717(91)90192-m

Cited by 110 publications

(45 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The highest density used (60 individuals of F. candida per system) corresponded to a density of 38,500 individuals m 22 which lies well within the range of collembolan densities observed in the field (Petersen and Luxton, 1982). No stimulation or acceleration of fungal growth, as reported by van der Drift and Jansen (1977); Bengtsson and Rundgren (1983) or Hedlund et al (1991), was observed.…”

Section: Effects Of Grazing Intensitymentioning

confidence: 72%

“…Obviously, grazing by smaller organisms-although performed by a larger number of individuals-can be compensated for by the fungus whereas the damage by larger grazers alters fungal growth. These size-dependent effects might in part explain the different outcomes (sometimes increase, sometimes decrease in biomass) of experiments using collembolans as grazers of fungi (van der Drift and Jansen, 1977;Bengtsson and Rundgren, 1983;Hedlund et al, 1991;Hanlon and Anderson, 1979). Species-specific effects have also been described with regard to N-mineralisation (Mebes and Filser, 1998), the latter occurring as a result of grazing on fungi.…”

Section: Species Specific Effectsmentioning

confidence: 99%

“…38% of the grazed mycelia, however, did not maintain their initial growth-pattern and changed to a longer ranged explorative strategy. As in the experiment of Hedlund et al (1991) we interpret this observation as a fugitive response and as a strategy for quickly escaping from places where grazing pressure is experienced. Here the guerilla strategy does not resemble an exploration for nutrients or energy but an exploration for enemy-free space, for pores and substrates out of reach of the grazer.…”

Section: Switch In Growth Strategymentioning

confidence: 99%

“…We are aware of only a single paper on this topic: Hedlund et al (1991) showed that grazing by a Collembolan induced a switch in mycelial morphology of the fungus Morteriella isabellina in agar culture. Interestingly, the grazing location and subsequent locations of mycelial responses were not identical, indicating a propagation of information through the mycelium.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Collembolan grazing affects the growth strategy of the cord-forming fungus Hypholoma fasciculare

Kampichler

Rolschewski

Donnelly

et al. 2004

Soil Biology and Biochemistry

Self Cite

View full text Add to dashboard Cite

Mycelia of cord-forming fungi show remarkable patterns of reallocation of biomass and nutrients indicating an important role of these, often extensive, organisms in the spatial translocation of energy and nutrients in forest soils. Despite the rich tradition of interaction studies between soil microarthropods and fungi, the spatial implications of these interactions, due to the potential growth responses of the fungi and to the translocation of energy and nutrients within the mycelial network, have been largely ignored. In this paper we analyse fungal growth responses in two-dimensional model systems composed of compressed soil, the cord-forming fungus Hypholoma fasciculare and three fungivorous Collembolan species. We hypothesised that (i) the highly co-ordinated nature of cord-forming fungi would lead to growth responses following collembolan grazing, and that, (ii) such changes are dependent on grazing intensity, and (iii) changes are dependent on the species grazing. Mycelial extent and hyphal cover decreased with increasing grazing density; at highest grazing density also the fractal dimension of the mycelial border decreased, indicating a less branched foraging front due to the regression of fine hyphae and the development of mycelial cords. Effects differed greatly between collembolan species although they exerted comparable grazing pressure (the smaller species were added in larger numbers according to their allometric size-metabolic rate relationships): while grazing by Folsomia candida resulted in less mycelial extension and hyphal cover, these variables were not affected when Proisotoma minuta and Hypogastrura cf. tullbergi grazed. The effects of a species mix suggested an additive effect of the component species. This shows that fungal mycelia may suffer from damage caused by few but large collembolans, affecting extension as well as coverage of the mycelium, but that fungi may compensate for the biomass loss caused by more but slightly smaller collembolans. In about 20% of the model systems H. fasciculare switched from a growth pattern with a broad contiguous foraging front and uniform growth in all directions to a pattern with fast growing sectors while other sectors stopped growth completely. The switch occurred in grazed systems exclusively; thus we interpret this observation as a fugitive response and as a strategy for quickly escaping from places where grazing pressure is experienced. q

show abstract

Section: Effects Of Grazing Intensitymentioning

confidence: 72%

Section: Species Specific Effectsmentioning

confidence: 99%

Section: Switch In Growth Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collembolan grazing affects the growth strategy of the cord-forming fungus Hypholoma fasciculare

Kampichler

Rolschewski

Donnelly

et al. 2004

Soil Biology and Biochemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…The enhanced production of protease appears to be a physiological response to faunal grazing. This hypothesis is supported by a microcosm experiment of Hedlund et al (1991) which showed higher extracellular protease production of Mortierella isabellina by the grazing of Onychiurus armatus (Collembola) and by an earlier mesocosm experiment in a spruce forest . No eect of microarthropods on protease activity was found by Schlatte et al (1998) in a microcosm experiment using comparable substrates, but lasting for a shorter period.…”

Section: Decomposition Of Organic Nitrogen Compoundsmentioning

confidence: 80%

Chemical Communications

Omenetto¹,

Kaplan²

2012

View full text Add to dashboard Cite

Using ®eld mesocosms maintained for 6 months in an acid spruce forest, we investigated the in¯uence of microarthropods on biomass, structure and function of the soil microbial community. In the litter layer (L/F layer), the re-immigration of mesofauna into mesocosms did not signi®cantly aect substrate-induced respiration (SIR), biomass C, biomass N, biomass P, Nmineralisation or enzymes involved in N cycling. There was no eect of the mesofauna on the biomarkers for fungal biomass (ergosterol and phospholipid fatty acid 18:2o6) in the litter layer. Mesofauna activities increased microbial biomass (biomass C, N and P) in the H layer, and signi®cantly increased soil protease activity and phosphate content in the H layer. Since biomass P did not change signi®cantly when mesofauna recolonised mesocosms, they presumably aected P-mineralisation by producing Prich faeces. Discriminant analysis showed that mesofauna aected microbial N-mobilisation in the H layer. Higher protease and arginine deaminase activities in mesocosms with mesofauna may have been caused by faunal grazing on soil microorganisms. #

show abstract

Spatial Organisation Of Soil Fungi

Ritz

2007

The Spatial Distribution of Microbes in the Environment

View full text Add to dashboard Cite

Mycelial responses of the soil fungus, Mortierella isabellina, to grazing by Onychiurus armatus (collembola)

Cited by 110 publications

References 23 publications

Collembolan grazing affects the growth strategy of the cord-forming fungus Hypholoma fasciculare

Collembolan grazing affects the growth strategy of the cord-forming fungus Hypholoma fasciculare

Chemical Communications

Spatial Organisation Of Soil Fungi

Contact Info

Product

Resources

About