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Dew and fog as possible evolutionary drivers? The expansion of crustose and fruticose lichens in the Negev is respectively mainly dictated by dew and fog

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Abstract

Main conclusion

The expansion of crustose lichens in the Negev is principally determined by dew and that of fruticose lichens by fog. Crustose and fruticose lichens are largely adapted to dew and fog, respectively.

Abstract

Although crustose and fruticosea lichens were shown to efficiently use dew and fog, the link between their expansion and the occurrence of dew and fog has never been shown experimentally. This is also the case for the Negev Desert Highlands, where (i) dewless habitats were not inhabited by lichens and (ii) an increase in fruticose lichens with high-altitude fog-prone areas was noted, leading us to hypothesize that the expansion of crustose and fruticose lichens is mainly linked to dew and fog, respectively. Experiments aiming to compare the non-rainfall water (NRW) were conducted. We used cloths attached to 7 cm-high cobbles to mimic crustose lichens (MCL), cloths placed horizontally aboveground to evaluate the amount of NRW without the presence of the cobble (CoP), cloths attached to a wire scaffold mimicking fruticose lichens (MFL), and cloths attached to glass plates (CPM) that served as a reference. Substrate temperatures were compared to the dew point temperature. In addition, sprinkling experiments, which mimicked fog under variable wind speeds (0.9, 1.4, 3.3 and 5.7 m s−1), were also conducted. NRW followed the pattern: MCL ≈ CPM > CoP >  > MFL. While MCL yielded substantially higher amounts of NRW (0.09 mm) in comparison to MFL (0.04 mm) during dew events, similar amounts were obtained by both substrates (0.15–0.16 mm) following fog. However, fog interception increased substantially with wind speed. The findings may explain the expansion of crustose lichens in extreme deserts benefiting mainly from dew (but also fog), and the proliferation of fruticose lichens in fog-prone areas, especially when accompanied by high-speed winds. While (mainly) high proliferation of crustose lichens may serve as bioindicators for dew in extreme deserts, fruticose lichens may serve as bioindicators for fog.

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Abbreviations

NRW:

Non-rainfall water

CPM:

Cloth–plate method

MCL:

Mimicked crustose lichen

MFL:

Mimicked fruticose lichen

CoP:

Cloth on poles

NIZ:

Nizzana site

SB:

Sede Boqer site

HH:

Har Harif site

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Acknowledgements

Uri Blaya and Olga Uclés are greatly acknowledged for some of the pioneering dew measurements. We greatly appreciate the very important contribution of the reviewers.

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Correspondence to Giora J. Kidron.

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The author declare no conflict of interest.

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Communicated by Dorothea Bartels.

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Kidron, G.J., Kronenfeld, R. Dew and fog as possible evolutionary drivers? The expansion of crustose and fruticose lichens in the Negev is respectively mainly dictated by dew and fog. Planta 255, 32 (2022). https://doi.org/10.1007/s00425-021-03817-8

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  • DOI: https://doi.org/10.1007/s00425-021-03817-8

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