Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest
The effects of human disturbance on biodiversity can be mediated by environmental conditions, such as water availability, climate and nutrients. In general, disturbed, dry or nutrient-depleted soils areas tend to have lower taxonomic diversity. However, little is known about how these environmental...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/aa9f5e |
| _version_ | 1797748149069021184 |
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| author | Julia C Sfair Francesco de Bello Thaysa Q de França Cristina Baldauf Marcelo Tabarelli |
| author_facet | Julia C Sfair Francesco de Bello Thaysa Q de França Cristina Baldauf Marcelo Tabarelli |
| author_sort | Julia C Sfair |
| collection | DOAJ |
| description | The effects of human disturbance on biodiversity can be mediated by environmental conditions, such as water availability, climate and nutrients. In general, disturbed, dry or nutrient-depleted soils areas tend to have lower taxonomic diversity. However, little is known about how these environmental conditions affect functional composition and intraspecific variability in tropical dry forests. We studied a seasonally dry tropical forest (SDTF) under chronic anthropogenic disturbance (CAD) along rainfall and soil nutrient gradients to understand how these factors influence the taxonomic and functional composition. Specifically we evaluated two aspects of CAD, wood extraction and livestock pressure (goat and cattle grazing), along soil fertility and rainfall gradients on shrub and tree traits, considering species turnover and intraspecific variability. In addition, we also tested how the traits of eight populations of the most frequent species are affected by wood extraction, livestock pressure, rainfall and soil fertility. In general, although CAD and environmental gradients affected each trait of the most widespread species differently, the most abundant species also had a greater variation of traits. Considering species turnover, wood extraction is associated with species with a smaller leaf area and lower investment in leaf mass, probably due to the indirect effects of this disturbance type on the vegetation, i.e. the removal of branches and woody debris clears the vegetation, favouring species that minimize water loss. Livestock pressure, on the other hand, affected intraspecific variation: the herbivory caused by goats and cattle promoted individuals which invest more in wood density and leaf mass. In this case, the change of functional composition observed is a direct effect of the disturbance, such as the decrease of palatable plant abundance by goat and cattle herbivory. In synthesis, CAD, rainfall and soil fertility can affect trait distribution at community and species levels, which can have significant implications for the ecosystem functioning of SDTF under increasing levels of disturbance, climate change and soil nutrient depletion. |
| first_indexed | 2024-03-12T16:01:47Z |
| format | Article |
| id | doaj.art-8d88d6f975bc4c86b36b68e9a9624845 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T16:01:47Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-8d88d6f975bc4c86b36b68e9a96248452023-08-09T14:37:25ZengIOP PublishingEnvironmental Research Letters1748-93262018-01-0113202500510.1088/1748-9326/aa9f5eChronic human disturbance affects plant trait distribution in a seasonally dry tropical forestJulia C Sfair0https://orcid.org/0000-0003-3823-7233Francesco de Bello1Thaysa Q de França2Cristina Baldauf3Marcelo Tabarelli4Deparment of Botany, Federal University of Pernambuco, Recife, 50670-901 Pernambuco, Brazil; Deparment of Botany, Faculty of Sciences, University of South Bohemia, České Budejovice, Czech Republic; Author to whom any correspondence should be addressed.Deparment of Botany, Faculty of Sciences, University of South Bohemia, České Budejovice, Czech RepublicGraduation in Environmental Science, Federal University of Pernambuco, Recife, 50670-901 Pernambuco, BrazilDepartment of Bioscience, Federal Rural University of Semiarid Region, Mossoró, CEP 59625-900, Mossoró, RN, BrazilDeparment of Botany, Federal University of Pernambuco, Recife, 50670-901 Pernambuco, BrazilThe effects of human disturbance on biodiversity can be mediated by environmental conditions, such as water availability, climate and nutrients. In general, disturbed, dry or nutrient-depleted soils areas tend to have lower taxonomic diversity. However, little is known about how these environmental conditions affect functional composition and intraspecific variability in tropical dry forests. We studied a seasonally dry tropical forest (SDTF) under chronic anthropogenic disturbance (CAD) along rainfall and soil nutrient gradients to understand how these factors influence the taxonomic and functional composition. Specifically we evaluated two aspects of CAD, wood extraction and livestock pressure (goat and cattle grazing), along soil fertility and rainfall gradients on shrub and tree traits, considering species turnover and intraspecific variability. In addition, we also tested how the traits of eight populations of the most frequent species are affected by wood extraction, livestock pressure, rainfall and soil fertility. In general, although CAD and environmental gradients affected each trait of the most widespread species differently, the most abundant species also had a greater variation of traits. Considering species turnover, wood extraction is associated with species with a smaller leaf area and lower investment in leaf mass, probably due to the indirect effects of this disturbance type on the vegetation, i.e. the removal of branches and woody debris clears the vegetation, favouring species that minimize water loss. Livestock pressure, on the other hand, affected intraspecific variation: the herbivory caused by goats and cattle promoted individuals which invest more in wood density and leaf mass. In this case, the change of functional composition observed is a direct effect of the disturbance, such as the decrease of palatable plant abundance by goat and cattle herbivory. In synthesis, CAD, rainfall and soil fertility can affect trait distribution at community and species levels, which can have significant implications for the ecosystem functioning of SDTF under increasing levels of disturbance, climate change and soil nutrient depletion.https://doi.org/10.1088/1748-9326/aa9f5eCaatingaintraspecific variabilitylivestockrainfallsoil fertilityspecies turnover |
| spellingShingle | Julia C Sfair Francesco de Bello Thaysa Q de França Cristina Baldauf Marcelo Tabarelli Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest Environmental Research Letters Caatinga intraspecific variability livestock rainfall soil fertility species turnover |
| title | Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| title_full | Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| title_fullStr | Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| title_full_unstemmed | Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| title_short | Chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| title_sort | chronic human disturbance affects plant trait distribution in a seasonally dry tropical forest |
| topic | Caatinga intraspecific variability livestock rainfall soil fertility species turnover |
| url | https://doi.org/10.1088/1748-9326/aa9f5e |
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