Beta-diversity: Effect of Geographical Distance and Environmental Gradients on the Rocky Outcrop Bryophytes

Silva, Joan Bruno; Santos, Nivea Dias dos; Pôrto, Kátia Cavalcanti

doi:10.7872/cryb.v35.iss2.2014.133

Cited by 25 publications

(28 citation statements)

References 51 publications

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“…Despite soil islands being one of the richest microhabitats of rocky outcrops of xeric environments (Silva et al 2014), the richness of bryophytes is naturally low in these habitats (Silva & Germano 2013;Silva et al 2014), probably because of the low tolerance of bryophytes to water deficit. This low level of species richness could decrease the predictive power of SAR (Patiño et al 2014), but this was not corroborated by other studies (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Bryophytes have greater species richness in wet tropical forest than in dry tropical forests (see Delgadillo & Cárdenas 1990;Pôrto et al 1994;Pôrto & Bezerra 1996;Glime 2007;Silva & Germano 2013;Silva et al 2014). Despite soil islands being one of the richest microhabitats of rocky outcrops of xeric environments (Silva et al 2014), the richness of bryophytes is naturally low in these habitats (Silva & Germano 2013;Silva et al 2014), probably because of the low tolerance of bryophytes to water deficit.…”

Section: Discussionmentioning

confidence: 99%

“…All the studied outcrops were located in Brazilian Seasonally Dry Tropical Forest of the Caatinga domain. According to Silva et al (2014), elevation does not influence species richness or community composition of bryophytes of xeric rocky outcrops, and so macroclimate variables were not considered in the present study.…”

Section: Study Areamentioning

confidence: 99%

“…The soil islands differed in size and shape (see Silva et al 2014), and varied in soil depth (Tab. S1 in supplementary material).…”

Section: Sampling Designmentioning

confidence: 99%

“…Soil islands on rocky outcrops can harbor considerable plant diversity (Conceição et al 2007;Silva et al 2014). Each rocky outcrop can harbor hundreds of soil islands (Conceição et al 2007) in which the number of colonizing plant species depends on many factors, such as island size and the depth of its soil.…”

Section: Introductionmentioning

confidence: 99%

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Bryophyte richness of soil islands on rocky outcrops is not driven by island size or habitat heterogeneity

et al. 2018

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Th e species-area relationship (SAR) is one of the oldest and most studied ecological models, having even served as the foundation of the Th eory of Island Biogeography. Nevertheless, the relative importance of habitat heterogeneity to SAR remains poorly understood. Our aim was to test the relative importance of habitat heterogeneity to the SAR of bryophyte assemblages of soil islands of rocky outcrops in the semi-arid region of Brazil. We randomly selected 15 to 20 soil islands on each of four outcrops for a total of 59 soil islands, and calculated the area, mean depth, and number of substrates for each. We used Generalized Linear Models (GLM) to test the SAR with two models, one using species richness and another using life-form richness as the dependent variables. We found no positive relationship between area and habitat heterogeneity, nor any evidence of a SAR, such as a positive relationship between area and species or life-form richness neither between habitat heterogeneity and species richness. However, our fi ndings did show that life-form richness is related to bryophyte species richness on the soil islands. We conclude by suggesting that not only can microclimate infl uence bryophyte richness, but opportunistic colonization by bryophytes is also important.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

“…The soil islands differed in size and shape (see Silva et al 2014), and varied in soil depth (Tab. S1 in supplementary material).…”

Section: Sampling Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bryophyte richness of soil islands on rocky outcrops is not driven by island size or habitat heterogeneity

et al. 2018

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Taxon‐dependent effects of dispersal limitation versus environmental filters on bryophyte assemblages―Multiple perspective studies in land‐bridge islands

Zhang

Luo

et al. 2023

Ecology and Evolution

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To explore the taxon‐dependent contribution of dispersal limitation versus environmental filters to bryophyte assemblages. We investigated bryophytes and six environmental variables on 168 islands in the Thousand Island Lake,China. We compared the observed beta diversity with the expected values based on six null models (EE, EF, FE, FF, PE, and PF), detected the partial correlation of beta diversity with geographical distances. We quantified the contributions of spatial versus environmental variables and island isolation per se to species composition (SC) using variance partitioning. We modeled the species‐area relationships (SARs) for bryophytes and the other eight biotas. To explore the taxon‐dependent effects of spatial versus environmental filters on bryophytes, 16 taxa including five categories (total bryophytes, total mosses, liverworts, acrocarpous, and pleurocarpous mosses) and 11 species‐richest families were included in the analyses. The observed beta diversity values were significantly different from the predicted values for all 16 taxa. For all five categories, the observed partial correlations between beta diversity and geographical distance after controlling environmental effects were not only positive, but also significantly different from the predicted values based on the null models. Spatial eigenvectors are more important in shaping SC than environmental variables for all 16 taxa except Brachytheciaceae and Anomodontaceae. Spatial eigenvectors contributed more to SC variation in liverworts than in mosses and in pleurocarpous mosses than in acrocarpous mosses. The effects of island isolation on SC were significant for all five categories, highly varied at the family level. The z values of the SARs for the five bryophyte categories were all larger than those of the other eight biotas. In subtropical fragmented forests, dispersal limitation exerted significant, taxon‐dependent effects on bryophyte assemblages. It was dispersal limitation rather than environmental filtering that predominantly regulated the SC patterns of bryophytes.

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Similar mechanisms underlie beta diversity of bryophytes in two archipelagos with different isolation time

et al. 2020

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Community assembly of island plants is a central topic in island biogeography. Most previous studies have focused on seed plants, while our understanding of bryophytes is limited. Specifically, how dispersal limitation and habitat heterogeneity shape beta diversity of bryophyte communities on islands remains unknown. We used two datasets of bryophyte communities from an artificial (~60 yr of isolation) and natural archipelago (~8500 yr of isolation) to understand their beta diversity patterns. The null model, in which species could disperse randomly and colonize successfully between islands, but the number of species on each island and the frequency of each species occurrence across all islands remain unchanged, was used to calculate expected beta diversity. Although we found significant differences in species composition between the two archipelagos, the difference in observed beta diversity was negligible. Further, there was no significant difference between observed and expected beta diversity in each archipelago. The difference in island area, rather than isolation, was significantly correlated with the beta diversity of bryophytes in both archipelagos. Our results suggest that the dispersal limitation is not the major ecological process driving the assembly of bryophyte communities in both archipelagos, but the habitat heterogeneity related to island area determines the beta diversity of bryophytes.

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Beta-diversity: Effect of Geographical Distance and Environmental Gradients on the Rocky Outcrop Bryophytes

Cited by 25 publications

References 51 publications

Bryophyte richness of soil islands on rocky outcrops is not driven by island size or habitat heterogeneity

Bryophyte richness of soil islands on rocky outcrops is not driven by island size or habitat heterogeneity

Taxon‐dependent effects of dispersal limitation versus environmental filters on bryophyte assemblages―Multiple perspective studies in land‐bridge islands

Similar mechanisms underlie beta diversity of bryophytes in two archipelagos with different isolation time

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