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Dispersal patterns of meiospores shape population spatial structure of saxicolous lichens

Published online by Cambridge University Press:  24 July 2017

M. MORANDO ,
S. E. FAVERO-LONGO ,
M. CARRER ,
E. MATTEUCCI ,
J. NASCIMBENE ,
S. SANDRONE ,
L. APPOLONIA  and
R. PIERVITTORI
M. MORANDO
Affiliation:
Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy.
S. E. FAVERO-LONGO*
Affiliation:
Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy.
M. CARRER
Affiliation:
Dipartimento Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell’Università 16, 35020 Legnaro (PD), Italy
E. MATTEUCCI
Affiliation:
Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy.
J. NASCIMBENE
Affiliation:
Dipartimento di Biologia, Università degli Studi di Padova, Via U. Bassi 58/ B, 35121 Padova, Italy
S. SANDRONE
Affiliation:
Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy.
L. APPOLONIA
Affiliation:
Laboratorio Analisi Scientifica, Direzione Ricerca e Progetti Cofinanziati, Soprintendenza per i Beni e le Attività Culturali, Regione Autonoma Valle d’Aosta, Piazza Narbonne 3, 11100 Aosta, Italy
R. PIERVITTORI
Affiliation:
Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy.
*
Email: [email protected]
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Abstract

Relationships between reproductive strategies and population spatial structure have often been suggested for lichens, but there is a lack of supporting aerobiological data. For the first time, this study couples aerobiological investigations on meiospore dispersal by Caloplaca crenulatella (Nyl.) H. Olivier and Rhizocarpon geographicum (L.) DC. with analysis of local spatial patterns of thalli of both species. During a two-year monitoring period carried out on the walls of a medieval castle in NW Italy, a total of 169 polar diblastic spores, 20% of which were morphologically attributable to C. crenulatella, was detected in the mycoareosol, while muriform spores of R. geographicum were never found. Laboratory experiments confirmed that different dispersal patterns characterize the two species, the meiospores of R. geographicum being poorly discharged and only recovered at a short distance from thalli, whereas those of C. crenulatella were more abundantly discharged, suspended and better dispersed by a moderate air flow. This difference was reflected on the castle walls by the random spatial pattern of C. crenulatella, while R. geographicum showed a clustered distribution. Different discharge rates and take-off limitations, possibly related to size differences between the spores, are not sufficient to explain the different colonization patterns and dynamics of the two species. Additional intrinsic and extrinsic factors are likely to drive their dispersal and establishment success. Nevertheless, information on the relationships between different dispersal patterns of the species and the local spatial structure of their populations might help to predict the recovery potential of lichen species exposed to habitat loss or disturbance, or encrusting monument surfaces.

Keywords

aerobiologyCaloplaca crenulatellaRhizocarpon geographicumstone cultural heritagesubstratum preference
Type
Articles
Information
The Lichenologist , Volume 49 , Issue 4 , July 2017 , pp. 397 - 413
Copyright
© British Lichen Society, 2017 

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