Identification of drivers of landscape distribution of forest orchids using germination experiment and species distribution models.

Abstract:

:The family of orchids involves a number of critically endangered species. Understanding of drivers of their landscape distribution could provide a valuable insight into their decline. Our objectives were to develop models predicting distribution of selected orchid species-four co-occurring forest orchid species, Cephalanthera rubra, Epipactis atrorubens, E. helleborine, and Neottia nidus-avis-at a landscape scale using a wide range of habitat characteristics. Subsequently, we compared the model predictions with species occurrence and the results of the field germination experiment while considering two germination stages-asymbiotic (early stage) and symbiotic. And finally, we attempted to identify possible drivers of species' landscape distribution (i.e., dispersal, availability of habitat patches, or fungal associates). We have discovered that different habitat characteristics determined the distribution of different orchids. The species also differed in terms of availability of suitable habitat patches and patch occupancy (the highest being E. atrorubens with 80%). Landscape distribution of the species was primarily restricted by the availability of fungal associates (the most important factor for C. rubra) and by the availability of suitable habitat patches (the most important in case of N. nidus-avis). Despite expected easy dispersal of spores, orchid distribution seems to be limited by the availability of fungal associates in the landscape. In contrast, the availability of orchid seeds does not seem to limit their distribution. These results can provide useful guidelines for conservation of the studied species.

journal_name

Oecologia

journal_title

Oecologia

authors

Hemrová L,Kotilínek M,Konečná M,Paulič R,Jersáková J,Těšitelová T,Knappová J,Münzbergová Z

doi

10.1007/s00442-019-04427-8

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

411-423

issue

2

eissn

0029-8549

issn

1432-1939

pii

10.1007/s00442-019-04427-8

journal_volume

190

pub_type

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