Parasitism of pollen as a nutritional source for lignicolous Basidiomycota and other fungi

Hutchison, Leonard J.; Barron, George

doi:10.1017/s095375629600233x

Cited by 39 publications

(28 citation statements)

References 26 publications

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“…The rapid decomposition and colonization of pollen grains by bacteria and aquatic fungi is evident (Goldstein 1960;Hutchison and Barron 1997;Czeczuga and Muszyńska 2001;Wurzbacher et al 2010 and references therein). The prevalence of infection of pollen grains by zoosporic fungi was highest in treatments of Fuku SW, but was 50% lower in Fuku NE and even lower in Lake Stechlin.…”

Section: Microbial and Chemical Degradation Of Pollenmentioning

confidence: 99%

“…Webster and Benfield 1986;Baldy et al 1995;Gessner et al 1999), pollen input from pine forests into lakes has received little attention. This is surprising since pollen grains are an excellent microbial substrate and habitat (Goldstein 1960;Hutchison and Barron 1997;Czeczuga and Muszyńska 2001). For example, pollen of Pinus sylvestris consists of ca.…”

Section: Introductionmentioning

confidence: 99%

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Effects of pollen leaching and microbial degradation on organic carbon and nutrient availability in lake water

et al. 2011

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Nutrient fluxes across terrestrial-aquatic boundaries and their subsequent integration into lake nutrient cycles are currently a major topic of aquatic research. Although pollen represents a good substrate for microorganisms, it has been neglected as a terrestrial source of organic matter in lakes. In laboratory experiments, we incubated pollen grains of Pinus sylvestris in water of lakes with different trophy and pH to estimate effects of pollen input and its subsequent microbial degradation on nutrient dynamics. In this ex situ experiment, we measured concentrations of organic carbon, phosphorus and nitrogen in the surrounding water as well as microbial dynamics (bacteria and fungal sporangia) at well-controlled conditions. Besides leaching, chemical and microbial decomposition of pollen was strongest within the first week of incubation. This led to a marked increase of soluble reactive phosphorus and total dissolved nitrogen (up to 0.04 and 1.5 mg L -1 , respectively, after 5 days of incubation) in the ambient water. In parallel, pollen grains were rapidly colonized by heterotrophic bacteria and aquatic fungi. Leaching and microbial degradation of pollen accounted for C80, C40, C50% for organic C, N and P, respectively, and did not significantly differ among water samples from the studied lakes. Thus, pollen introduces high amounts of bio-available terrestrial organic matter and nutrients into surface waters within a short time. A rough calculation on P input into oligotrophic Lake Stechlin indicates that pollen plays an important ecological role in nutrient cycling of temperate lakes. This requires further attention in aquatic ecology.

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Section: Microbial and Chemical Degradation Of Pollenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of pollen leaching and microbial degradation on organic carbon and nutrient availability in lake water

et al. 2011

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“…Nevertheless, as early as the 1960s, some studies showed that pollen grains can be decomposed by zoosporic fungi, such as chytrids (Goldstein 1960;Skvarlaa and Anderegg 1972;Hutchison and Barron 1997). Once mature, the fungal sporangia release zoospores that are small enough (, 5 mm) for cladocerans to eat (Kagami et al 2007).…”

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confidence: 99%

Food quality of anemophilous plant pollen for zooplankton

Masclaux

Bec

Kagami

et al. 2011

Limnology & Oceanography

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Pollen rain can lead to considerable allochthonous particulate organic carbon input into freshwater systems. However, the importance of allochthonous pollen deposition for zooplankton production has not so far been considered. Here, standardized growth experiments were performed to assess the quality of pollen from three species (Alnus sp., Populus sp., and Cedrus sp.) as a food source for two cladocerans (Daphnia longispina and Simocephalus vetulus). Although lipid analysis revealed high polyunsaturated fatty acid (PUFA) contents in pollen, both cladoceran species exhibited suboptimal development when directly fed on pollen (ranging from 0.2 d 21 to 0.3 d 21 ). The low food value of pollen was attributed to the presence of a refractory wall reducing its digestibility. In a second set of experiments, cladocerans were fed on a mixture of heterotrophic microorganisms (bacteria, chytrids, and protozoa) that had grown on pollen grains (Cedrus sp.). The introduction of microorganisms as an intermediate trophic level resulted in cladoceran growth rates that were about double those obtained on pollen alone. Hence, our findings suggest that pollen carbon could sustain zooplankton growth indirectly, and highlight the key role of microorganisms, and especially of chytrids, in transferring and upgrading pollen PUFA to higher trophic levels.

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“…If we consider pine pollen nutrients into account, the contribution rate of the pine pollen in annual nutrient input is higher in our study (N 1/71 -82, P 1/13 -20, K 1/19 -30 that of litter fall). Hutchison & Barron (1997) showed that many lignicolous fungi are capable of degrading pollen. Lee (2000) reported that pine pollen nutrients are of value to ectomycorrhizal fungal growth.…”

Section: Discussionmentioning

confidence: 99%