Gastropods slow down succession and maintain diversity in cryptogam communities

Boch, Steffen; Prati, Daniel; Fischer, Markus (2016). Gastropods slow down succession and maintain diversity in cryptogam communities. Ecology, 97(9), pp. 2184-2191. Ecological Society of America 10.1002/ecy.1498

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Herbivore effects on diversity and succession were often studied in plants, but not in cryptogams. Besides direct herbivore effects on cryptogams, we expected indirect effects by changes in competitive interactions among cryptogams. Therefore, we conducted a long-term gastropod exclusion experiment testing for grazing effects on epiphytic cryptogam communities. We estimated the grazing damage, cover and diversity of cryptogams before gastropods were excluded and three and six years thereafter. Gastropod herbivory pronouncedly affected cryptogams, except for bryophytes, strongly depending on host tree species and duration of gastropod exclusion. On control trees, gastropod grazing regulated the growth of algae and non-lichenized fungi and thereby maintained a high lichen diversity and cover. On European beech, the release from gastropod grazing temporarily increased lichen vitality, cover, and species richness, but later caused rapid succession where algae and fungi overgrew lichens and thereby reduced their cover and diversity compared with the control. On Norway spruce, without gastropods lichen richness decreased and lichen cover increased compared with the control. Our findings highlight the importance of long-term exclusion experiments to disentangle short-term, direct effects from longer-term, indirect effects via changes in competitive relationships between taxa. We further demonstrated that gastropod feeding maintains the diversity of cryptogam communities.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Ecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Boch, Steffen; Prati, Daniel and Fischer, Markus

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0012-9658

Publisher:

Ecological Society of America

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

07 Oct 2016 12:45

Last Modified:

07 Oct 2016 12:45

Publisher DOI:

10.1002/ecy.1498

Uncontrolled Keywords:

algae, biodiversity, bryophyte, epiphyte, lichenized fungi, gastropod grazing, rapid succession, top-down regulation

BORIS DOI:

10.7892/boris.89168

URI:

https://boris.unibe.ch/id/eprint/89168

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