Functional trait and community phylogenetic analyses reveal environmental filtering as the major determinant of assembly of tropical forest tree communities in the Western Ghats biodiversity hotspot in India

Shivaprakash, K. Nagaraju; Ramesh, B. R.; Umashaanker, R.; Dayanandan, Selvadurai

doi:10.1186/s40663-018-0144-0

Cited by 15 publications

(8 citation statements)

References 76 publications

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“…This is consistent with the lack of a signal in LMA (the inverse of SLA) across angiosperm clades globally and indicates multiple selective pressures on this trait (Flores et al, 2014). However, deciduousness (which is directly related to drought tolerance) shows phylogenetic conservatism among tree species in the Western Ghats (Shivaprakash et al, 2018). Thus, traits directly relevant to drought tolerance might be more relevant to understand how evolutionary relationships might have shaped assembly across the seasonality gradient in the Western Ghats (Bose et al, 2019).…”

Section: Traits and Species Response To Seasonal Droughtsupporting

confidence: 68%

Seasonal drought regulates species distributions and assembly of tree communities across a tropical wet forest region

Krishnadas

Sankaran

Page

et al. 2021

Global Ecol. Biogeogr.

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Aim How seasonal drought influences tree species distributions might shape future vegetation composition with impending changes to rainfall patterns. Theory suggests that across a seasonal drought gradient, dry‐tolerant species might have wider distributions than species sensitive to seasonal drought, which will be restricted to less seasonal conditions. As wet‐associated species drop out with increasing seasonality, the community will contain mainly dry‐tolerant species. Time period Present. Location Western Ghats Biodiversity Hotspot in peninsular India. Major taxa studied Woody angiosperms. Methods Across a 1,200 km seasonal drought gradient, we modelled occurrences of 183 species using Gaussian logistic regression in a hierarchical Bayesian framework. We used the first‐order model coefficients to attribute the association of species to seasonality (dry/wet) and second‐order coefficients to assess modal responses. For 92 species, we checked for an interaction between dry/wet association and two traits: wood density and specific leaf area (SLA). Finally, we assessed the consequences of the seasonality associations of species for regional community assembly. Results Of 183 species, 38% were significantly wet associated, 27% dry associated and 34% indifferent to seasonality. Nearly 80% of species had estimated modes of occurrence within the seasonality range considered here. Species with lower SLA and lower wood density were more likely to occur in more seasonal sites where dry‐associated species formed the majority of co‐occurring species. The proportion of wet‐associated species increased only after intermediate levels of seasonality. The community proportion of extreme wet‐associated species decreased prominently from less to more seasonal sites. Main conclusions Dry‐associated species persisted in less seasonal sites, but not vice versa. A shift toward more seasonal rainfall might favour dry‐associated species and shrink the ranges of wet‐associated species. Future work should assess how the intensity and duration of drought and interactions with other drivers of global change regulate the relative performance of species at more and less seasonal sites.

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Section: Traits and Species Response To Seasonal Droughtsupporting

confidence: 68%

Seasonal drought regulates species distributions and assembly of tree communities across a tropical wet forest region

Krishnadas

Sankaran

Page

et al. 2021

Global Ecol. Biogeogr.

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“…Species lacking trait adaptations necessary to persist under harsher climate conditions may therefore be filtered by the environment across the elevational range, leading to relatively more phylogenetically clustered assemblages at low elevations. Our analyses and previous findings indicate a general trend towards increased phylogenetic clustering as precipitation becomes more limited and seasonality increases in Indian forests (Bose et al, 2019; Divya et al, 2021; Shivaprakash et al, 2018). Significant community turnover combined with reductions in species richness provides further support for species and lineage filtering across the elevational range.…”

Section: Discussionsupporting

confidence: 79%

Phylogenetic community patterns suggest Central Indian tropical dry forests are structured by montane climate refuges

Grant

Davies

Harish

et al. 2023

Diversity and Distributions

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Aim We used an eco‐phylogenetic approach to investigate the diversity and assembly patterns of tropical dry forests (TDFs) in Central India. We aimed at informing conservation and restoration practices in these anthropogenically disturbed forests by identifying potential habitats of conservation significance and elements of regional biodiversity most vulnerable to human impact and climate change. Location Tropical dry forests of Madhya Pradesh, Central India. Methods We analysed the species richness, stem density, basal area and phylogenetic structure (standardized effect size of MNTD, MPD, PD and community evolutionary distinctiveness cED) of 117 tree species assemblages distributed across a ~230 to ~940 m elevational gradient. We examined how these community measures and taxonomic (Sørensen) and phylogenetic (UniFrac) beta diversity varied with elevation, precipitation, temperature and climatic stress. Results Species richness, phylogenetic diversity, stem density and basal area were positively correlated with elevation, with high‐elevation plots exhibiting cooler temperatures, higher precipitation and lower stress. High‐elevation assemblages also trended towards greater phylogenetic dispersion, which diminished at lower elevations and in drier, more stressful plots. Phylogenetic turnover was observed across the elevation gradient, and species evolutionary distinctiveness increased at lower elevations and under harsher abiotic conditions. Main Conclusions Harsher abiotic conditions at low elevations may act as a selective filter on plant lineages, leading to phylogenetically clustered low‐diversity assemblages. These assemblages contained more evolutionarily distinct species that may contribute disproportionately to biodiversity. Conversely, milder abiotic conditions at high elevations may serve as refuges for drought‐sensitive species, resulting in more diverse assemblages. Conservation practices that prioritize both high‐ and low‐elevation habitats could promote the persistence of evolutionarily distinct species and areas of high biodiversity within the Central Indian landscape. Establishing connectivity between these habitats may provide a range of climatic conditions for species to retreat to or persist within as climates change.

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“…However, the high cost of activated carbon restricts its widespread utilization. On the contrary, low-cost adsorbents including acid treated red mud (Toor et al, 2015), sand (Li P. et al, 2018), raw pine and acid treated pine (Schorr et al, 2018), Ashoka leaf (Shivaprakash et al, 2018), sulphuric acid treated Palm flower (Magdalena et al, 2018), hen feathers (Tesfaye et al, 2018), and clay minerals (Shaban et al, 2018) have been investigated for the treatment of dyes containing wastewater.…”

Section: Introductionmentioning

confidence: 99%

Citric Acid Modified Bentonite for Congo Red Adsorption

et al. 2019

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Raw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, and pH on adsorption was investigated. Adsorption equilibrium data fitted well with Langmuir model while the Langmuir adsorption capacity of CR on CAB reached up to 384 mg•g −1. Furthermore, CR adsorption on CAB followed pseudo-second kinetic model while intra-particle diffusion was not the only rate-limiting step as determined from intra-particle diffusion model investigation. RB and CAB were characterized by XRD, FT-IR, and BET techniques. A proposed mechanism for the adsorption of CR over CAB suggested the chemical adsorption phenomenon is mainly controlled by chelation, hydrogen bonding, and fixing.

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Functional trait and community phylogenetic analyses reveal environmental filtering as the major determinant of assembly of tropical forest tree communities in the Western Ghats biodiversity hotspot in India

Cited by 15 publications

References 76 publications

Seasonal drought regulates species distributions and assembly of tree communities across a tropical wet forest region

Seasonal drought regulates species distributions and assembly of tree communities across a tropical wet forest region

Phylogenetic community patterns suggest Central Indian tropical dry forests are structured by montane climate refuges

Citric Acid Modified Bentonite for Congo Red Adsorption

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