Data from: Context- and taxon-dependent small-scale taxonomic and phylogenetic nestedness of bryophytes on insular rocks in a karst natural reserve and its implication for their conservation
Data files
Nov 28, 2024 version files 560.36 KB
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APPENDIX1-5.xlsx
83.44 KB
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DNA_sequaence.fas
473.25 KB
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README.md
3.67 KB
Abstract
The distribution patterns of five categories and 183 species of bryophytes, and six physical attributes, on 92 insular rocks in three karst districts (Pangxiegou, the weather station in Shishangsenglin and Yaolancun) with different landscape properties in the Maolan National Nature Reserve, Guizhou, China, were recorded and analysed in terms of nestedness. By using matrix temperature, NODF metrics under four null models, treeNODF and permrows null model, we evaluated the taxonomic and phylogenetic nestedness at a small scale and explored possible underlying mechanisms. We found (1) a significant taxonomic and phylogenetic nestedness among the bryophytes and their main categories on these insular rocks, not only in the whole study region but also in each of the three districts; (2) higher taxonomic nestedness for mosses than for liverworts, and higher for acrocarpous mosses than for pleurocarpous mosses, indicating that nestedness of bryophytes on insular rocks in karst regions is taxon-dependent; (3) rock area, habitat amount and height are the three main determinants of taxonomic and phylogenetic nestedness of bryophytes, while phylogenetic nestedness overall followed the same processes as taxonomic nestedness; (4) selective extinction and habitats nestedness were the two mechanisms accounting for the small-scale nested pattern of bryophytes on insular rocks; (5) the determinants and mechanisms of taxonomic and phylogenetic nestedness varied among bryophytes in different landscapes and ecological habitats, thus being context-dependent. Our results indicate that (1) large rocks with rich microhabitats should be given priority for the conservation of saxicolous bryophytes; (2) the conservation of different categories of saxicolous bryophytes that have a limited congruence will require a multiple criteria approach that incorporates phylogenetic diversity differences into reserve planning; (3) the conservation strategies for bryophyte diversities in different ecosystems should be adapted to local conditions and differences among bryophyte groups.
README: Context- and taxon-dependent small-scale taxonomic and phylogenetic nestedness of bryophytes on insular rocks in a karst natural reserve and its implication for their conservation
[https://doi.org/10.5061/dryad.0zpc8676w]
We selected all well-insulated rocks in these three districts, resulting in a total of 92 sampling sites (rocks). These rocks varied in area, height, soil thickness, flatness, humidity, and habitat types (Supporting information). On each rock, several lines 30 cm apart were set. The length of these lines varied with rock size and shape. Along each line, a rigid frame (with an area of 10 × 10 cm) was placed at an interval of 30 cm along the line. The frame was further partitioned (by fine wires) into 25 sub-quadrats each with a size of 2.0 × 2.0 cm. The coverage of each bryophyte species on the frame (quadrate) was estimated by counting the number of intersection points of fine wires at which the species was present
Description of the data and file structure
Physiological data are summarized in a single excel file containing different tabs for different datasets. Details of Methodology on all data can be found in the publication "Context- and taxon-dependent small-scale taxonomic and phylogenetic nestedness of bryophytes on insular rocks in a karst natural reserve and its implication for their conservation" by Huang R. L. et al. 2024.
APPENDIX 1. — Classification of environmental factors
To determine the environmental factors influencing nested distribution of bryophytes in the study region, we arbitrarily and roughly estimate the following environmental variables of these 92 rocks, which include the degrees of soil thickness (from thin to thick), smoothness (from flat and smooth to uneven and rough), humidity (sunny day survey, from dry to wet), and canopy coverage (Vvascular plants directly above the stone, from large to small) with five classes, assigning them 1, 2, 3, 4 and 5, respectively .
APPENDIX 2. — Definitions of 25 microhabitat types on 92 rocks
A total of 25 habitat types were recorded for these rocks .
APPENDIX 3. — Twenty-five habitat types of 92 rocks
Rock no.=The stones we collected are numbered
Habitat types= 1-25 is the habitat types are listed in Appendix 2.
APPENDIX 4. — Environments of 92 rocks in the Maolan National Nature Reserve, China
Specific environmental factors for the 92 stone blocks we collected.
NO=The stones we collected are numbered
Locations=Divided into three areas: shishangsenlin, yaolancun, pangxiegou, Specific area information is recorded in the article.
Lontidue (º)=longitude
Latitude (º)=longitude
Highest point/m=Height of the highest point of each stone
Area/m2=The area of each stone, the exact calculation is mentioned in the article
Slope (º)=Slope at the top of each stone
Soil thickness=Grading system, see Appendix I for specific divisions
Flatness=Grading system, see Appendix I for specific divisions
Humidity=Grading system, see Appendix I for specific divisions
Mean height/cm=Average of the heights of all the sampling points for each stone block
Habitat number=APPENDIX 3 Calculated
Species number=APPENDIX 5 Calculated
APPENDIX 5. — Distribution of 183 bryophyte species on 92 rocks
Species-stone matrix of 183 bryophyte species in 92 stones
Species=scientific name for bryophytes,The nomenclature followed https://www.cvh.ac.cn/index.php
DNA sequence.fas
We used trnL–F, trnG, and ITS2 molecular markers to construct a phylogenetic tree, this is a sequence splice of three genes from 183 bryophyte species.