Survival of aquatic hyphomycetes in terrestrial situations

Sanders, Peter F.; Webster, John

doi:10.1016/s0007-1536(78)80103-x

Cited by 29 publications

(14 citation statements)

References 20 publications

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“…As Langhans and Tockner (2006) suggested, aquatic fungi activity can recover within one day after flow restoration, and our results agree with those reported by Bruder et al (2011) in a temperate stream after experimental desiccation treatments. The resumption of microbial activity is possible because aquatic hyphomycetes can persist in moist substrata (Sanders and Webster, 1978;Sridhar and Bärlocher, 1993). It seems that the humid climate during winter in N-Spain can maintain enough moisture on a substrate such as leaf-litter even at terrestrial environments, as Langhans and Tockner (2006) pointed out in NE-Italy.…”

Section: Discussionmentioning

confidence: 97%

Effects of flow scarcity on leaf-litter processing under oceanic climate conditions in calcareous streams

Martínez

Pérez

Molinero

et al. 2015

Science of The Total Environment

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Although temporary streams represent a high proportion of the total number and length of running waters, historically the study of intermittent streams has received less attention than that of perennial ones. The goal of the present study was to assess the effects of flow cessation on litter decomposition in calcareous streams under oceanic climate conditions. For this, leaf litter of alder was incubated in four streams (S1, S2, S3 and S4) with different flow regimes (S3 and S4 with zero-flow periods) from northern Spain. To distinguish the relative importance and contribution of decomposers and detritivores, fine- and coarse-mesh litter bags were used. We determined processing rates, leaf-C, -N and -P concentrations, invertebrate colonization in coarse bags and benthic invertebrates. Decomposition rates in fine bags were similar among streams. In coarse bags, only one of the intermittent streams, S4, showed a lower rate than that in the other ones as a consequence of lower invertebrate colonization. The material incubated in fine bags presented higher leaf-N and -P concentrations than those in the coarse ones, except in S4, pointing out that the decomposition in this stream was driven mainly by microorganisms. Benthic macroinvertebrate and shredder density and biomass were lower in intermittent streams than those in perennial ones. However, the bags in S3 presented a greater amount of total macroinvertebrates and shredders comparing with the benthos. The most suitable explanation is that the fauna find a food substrate in bags less affected by calcite precipitation, which is common in the streambed at this site. Decomposition rate in coarse bags was positively related to associated shredder biomass. Thus, droughts in streams under oceanic climate conditions affect mainly the macroinvertebrate detritivore activity, although macroinvertebrates may show distinct behavior imposed by the physicochemical properties of water, mainly travertine precipitation, which can override the flow intermittence effects.

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Section: Discussionmentioning

confidence: 97%

Effects of flow scarcity on leaf-litter processing under oceanic climate conditions in calcareous streams

Martínez

Pérez

Molinero

et al. 2015

Science of The Total Environment

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“…To ensure persistence during unfavourable periods (Iqbal and Webster 1973b), mycelia within leaves (e.g., Sanders and Webster 1978) or roots (Fisher et al 1991) or on wood (Shearer 1992), o r possibly sexually produced spores (Webster 1992), appear more important.…”

Section: Discussion Lmentioning

confidence: 99%

Viability of aquatic hyphomycete conidia in foam

Sridhar¹,

Bärlocher²

1994

Can. J. Bot.

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1994. Viability of aquatic hyphomycete conidia in foam. Can. J. Bot. 72: 106-110. The viability of aquatic hyphomycete conidia trapped in foam was estimated with tetrazolium bromide. In fresh foam, 76-91 % of all conidia had at least one viable cell; in old foam, these values were 20-43%. The average number of viable cells per conidium was higher in fresh than in old foam. Laboratory-produced conidia of Heliscus lugdunensis and Articulospora tetracladia had much higher numbers of viable cells than field-collected conidia. Viability as defined in this study (at least one viable cell per conidium) proved to be an excellent predictor of ability to germinate. Conidia of four species (two Canadian and two Indian strains) did not survive for more than 24 d when exposed to -17OC, or to freeze-thaw cycles. Persistence of conidia through unfavourable conditions therefore seems limited. SRIDHAR, K.R., et BARLOCHER, F. 1994. Viability of aquatic hyphomycete conidia in foam. Can. J. Bot. 72 : 106-110.Les auteurs ont utilisC le bromure de tCtrazolium pour Cvaluer la viabilitC des conidies d'hyphomycktes aquatiques prisonnikres d'tcumes. Dans les Ccumes fraiches, 76-91 % de toutes les conidies comportent au moins une cellule viable; dans les Ccumes plus IgCes, ces valeurs sont de 20-43%. Le nombre moyen de cellules viables par conidie est plus Clevt dans les jeunes Ccumes que dans le plus IgCes. Les conidies de l'Heliscus lugdunensis et de 1'Articulospora tetracladia, produites au laboratoire, comportent un nombre beaucoup plus grand de cellules viables que les conidies rtcoltCes en nature. Telle que dtfinie dans cette ttude (au moins une cellule viable par conidie), la viabilitC constitue un excellent moyen de prCdire la germinabilitk. Les conidies de quatre espbces (deux canadiennes et deux indiennes) ont CtC incapables de survivre pendant plus de 24 jours lorsqu'elles ont t t t exposCes i 3 -17"C, ou soumises ? i des cycles de gel et dtgel. I1 semble bien que la rCsistance de ces conidies aux conditions dCfavorables soit limitte.

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“…Of six identified species, three survived for more than 100 d (maximum: 170 d), and all survived for at least 30 d. Survival was greater in halfskeletonized than in skeletonized leaves. Sanders and Webster (1978) inoculated sets of oak leaf disks with one of ten pure cultures and exposed them on two terrestrial sites (with the nearest stream 20 or 200 m away). All ten species could be recovered after 8 weeks of exposure, and two survived for at least 12 months.…”

Section: Survival Out Of Watermentioning

confidence: 99%

Beyond the water column: aquatic hyphomycetes outside their preferred habitat

et al. 2016

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b s t r a c tAquatic hyphomycetes have adapted to running waters by their uncommon conidial shape, which facilitates dispersal as well as adherence to plant substrata. However, they have been early and regularly reported to occur in a variety of environments other than their preferred habitat (e.g., in lentic freshwaters, brackish and marine environments, in terrestrial niches such as stream banks, dew, canopy waters and tree holes). In addition, several aquatic hyphomycetes have adapted to a mutualistic lifestyle which may involve plant defence, as endophytes in leaves, gymnosperm needles, orchids and terrestrial roots.There are several lines of evidence suggesting that aquatic hyphomycetes survive under terrestrial conditions due to their sexual states. Although exhibiting higher diversity in pristine streams, aquatic hyphomycetes can survive environmental stress, e.g., pollution or river intermittency. They also inhabit ground and hyporheic waters, where they appear to be subjected to both physical and physiological selection. Appropriate methods including molecular ones should provide a more comprehensive view of the occurrence and ecological roles of aquatic hyphomycetes outside their preferred habitat.

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Survival of aquatic hyphomycetes in terrestrial situations

Cited by 29 publications

References 20 publications

Effects of flow scarcity on leaf-litter processing under oceanic climate conditions in calcareous streams

Effects of flow scarcity on leaf-litter processing under oceanic climate conditions in calcareous streams

Viability of aquatic hyphomycete conidia in foam

Beyond the water column: aquatic hyphomycetes outside their preferred habitat

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