Abstract
Abstract Background Plant-plant positive interactions are among the main drivers of plant community structure, especially in stressful environments. While the ecological dynamics of such facilitation are increasingly understood, studies evaluating the importance of nurse plants in preserving phylogenetic diversity and protecting species of medicinal value and conservation concern are still limited. Here, we investigated the nurse effects of a Himalayan endemic shrub, Berberis angulosa , in promoting taxonomic richness, composition and phylogenetic diversity of overall and highly valued species in the high-elevation mountain landscape of Langtang National Park, Nepal. Using pair-wise sampling design, we recorded plant communities within the patches of Berberis shrubs and in open gaps at three altitudinal belts. Results Compared to adjacent open areas, Berberis patches were found to harbor compositionally distinct and evolutionarily diverse lineage plant communities with significantly higher average overall and human-valued species richness. Relative interaction indices showed clear patterns along an elevation gradient with the strongest facilitation observed at highest elevations. Comparisons of phylogenetic diversity across elevations showed inconsistent patterns, whereas overall metrics indicated higher phylogenetic diversity in shrub habitats for human-valued species. Facilitation by Berberis enhanced community-level richness by 40% (39 species; total = 97), including 19 human-valued species (~ 36%; total = 53) that occurred exclusively within shrub canopies. Many medicinal, endemic and conservation priority species were either shrub specialists or had significant association with Berberis patches, illustrating the protective role of the nurse shrub. Conclusions Our results demonstrate that the facilitative effect of Berberis is not only crucial in maintaining plant communities with diverse evolutionary histories but also equally contributing to local beta and landscape-scale gamma biodiversity, sustaining valuable ecosystem services and benefits to human communities in the Himalayas. These findings suggest that appropriate management of such nurse plants may constitute a nature-based approach to biodiversity conservation, that should be considered in policies for sustainability, resilience, and ecosystem functioning in this high-elevation alpine system.
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Claims 11
Claim · model-written summary
Berberis patches hosted compositionally distinct plant communities relative to open areas.
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BerberisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“Compared to adjacent open areas, Berberis patches were found to harbor compositionally distinct and evolutionarily diverse lineage plant communities”
Claim · model-written summary
Berberis patches hosted evolutionarily diverse plant lineages.
- Outcome
- evolutionarily diverse lineage plant communitiese0
- Comparator
- adjacent open arease0
- Setting
- Berberis patchese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to adjacent open areas, Berberis patches were found to harbor compositionally distinct and evolutionarily diverse lineage plant communities”
Claim · model-written summary
Berberis patches had significantly higher overall species richness.
- Outcome
- average overall and human-valued species richnesse0
- Direction
- significantly highere0
- Setting
- Berberis patchese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Berberis patches were found to harbor compositionally distinct and evolutionarily diverse lineage plant communities with significantly higher average overall and human-valued species richness”
Claim · model-written summary
Berberis patches had significantly higher human valued species richness.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Berberis patches were found to harbor compositionally distinct and evolutionarily diverse lineage plant communities with significantly higher average overall and human-valued species richness”
Claim · model-written summary
Facilitation was strongest at the highest elevations.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative interaction indices showed clear patterns along an elevation gradient with the strongest facilitation observed at highest elevations.”
t0“endemic shrub”
e1“a Himalayan endemic shrub, Berberis angulosa”
Claim · model-written summary
Phylogenetic diversity comparisons varied inconsistently across elevations.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparisons of phylogenetic diversity across elevations showed inconsistent patterns”
t0“endemic shrub”
e1“a Himalayan endemic shrub, Berberis angulosa”
Claim · model-written summary
Human valued species had higher phylogenetic diversity in shrub habitats.
- Outcome
- phylogenetic diversitye0
- Direction
- highere0
- Qualifier
- human-valued speciese0
- Setting
- shrub habitatse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overall metrics indicated higher phylogenetic diversity in shrub habitats for human-valued species”
t0“endemic shrub”
e1“a Himalayan endemic shrub, Berberis angulosa”
Claim · model-written summary
Berberis facilitation increased community richness by 40%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Facilitation by Berberis enhanced community-level richness by 40% (39 species; total = 97)”
Claim · model-written summary
Nineteen human valued species occurred only under shrub canopies.
- Outcome
- human-valued speciese0
- Value
- 19 human-valued speciese0
- Qualifier
- occurred exclusively within shrub canopiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“including 19 human-valued species (~ 36%; total = 53) that occurred exclusively within shrub canopies”
t0“endemic shrub”
e1“a Himalayan endemic shrub, Berberis angulosa”
Claim · model-written summary
Medicinal, endemic and priority species were shrub specialists or significantly associated with patches.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Many medicinal, endemic and conservation priority species were either shrub specialists or had significant association with Berberis patches”
Claim · model-written summary
Authors recommend managing nurse shrubs for biodiversity conservation.
- Outcome
- appropriate management of such nurse plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“appropriate management of such nurse plants may constitute a nature-based approach to biodiversity conservation”
t0“endemic shrub”
e1“a Himalayan endemic shrub, Berberis angulosa”