Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest
The Atlantic Forest in Brazil is a biodiversity hotspot, yet its diverse ecosystems and species are becoming increasingly threatened by habitat loss and extreme habitat fragmentation. Most habitat patches of Atlantic Forest are dispersed across agricultural landscapes (e.g., grazing and cropping) in...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-05-01
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| Series: | Frontiers in Ecology and Evolution |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fevo.2021.614362/full |
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| author | Flávia Freire Siqueira Dulcineia de Carvalho Jonathan Rhodes Carla L. Archibald Vanessa Leite Rezende Eduardo van den Berg |
| author_facet | Flávia Freire Siqueira Dulcineia de Carvalho Jonathan Rhodes Carla L. Archibald Vanessa Leite Rezende Eduardo van den Berg |
| author_sort | Flávia Freire Siqueira |
| collection | DOAJ |
| description | The Atlantic Forest in Brazil is a biodiversity hotspot, yet its diverse ecosystems and species are becoming increasingly threatened by habitat loss and extreme habitat fragmentation. Most habitat patches of Atlantic Forest are dispersed across agricultural landscapes (e.g., grazing and cropping) in relatively small and isolated fragments (80% < 50 ha). Forest fragments < 1 ha, scattered trees in pastures, tree lines on trenches and fences, and remnant riparian forest, collectively called here Small Landscape Elements (SLEs), are very common in this context. While these SLEs make up much of the Atlantic Forests footprint, very little is known about their role or impact on the persistence and conservation of species. In this study, we investigate the role of SLEs on landscape configuration, particularly their contribution toward landscape connectivity of individual species and the genetic flow of species between larger forest fragments. We randomly selected 20 buffers of 707 hectares within a 411,670 hectare area of the Atlantic Forest that was completely covered by forest in the past located in the south of Minas Gerais State, Brazil. The forest cover randomly varied between these buffers. We used graph theory to measure landscape connectivity as the probability of connectivity for different disperser movement types between landscape knots (habitat patches). We used three estimated dispersal distances in the models: pollen disperser insect (50 m), low-mobility seed disperser bird (100 m) and high-mobility seed disperser bird (760 m). The SLEs together increased the probability of connection by roughly 50%, for all model dispersers, if compared to a theoretical baseline landscape containing no SLEs. Of all SLEs, riparian forests contribute the most toward enhancing landscape connectivity. In these highly fragmented landscapes, such as the Atlantic Forest (>70%), the position of SLEs within the landscapes was more important than their respective areas for connectivity. Although the landscapes were deeply fragmented, we showed that the presence of SLEs can increase connectivity and reduce further biodiversity loss in the Atlantic Forest. |
| first_indexed | 2024-12-23T14:37:16Z |
| format | Article |
| id | doaj.art-90e663a887a54cd8b11c368d7012100a |
| institution | Directory Open Access Journal |
| issn | 2296-701X |
| language | English |
| last_indexed | 2024-12-23T14:37:16Z |
| publishDate | 2021-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Ecology and Evolution |
| spelling | doaj.art-90e663a887a54cd8b11c368d7012100a2022-12-21T17:43:19ZengFrontiers Media S.A.Frontiers in Ecology and Evolution2296-701X2021-05-01910.3389/fevo.2021.614362614362Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic ForestFlávia Freire Siqueira0Dulcineia de Carvalho1Jonathan Rhodes2Carla L. Archibald3Vanessa Leite Rezende4Eduardo van den Berg5Forestry Department, Federal University of Lavras, Câmpus Universitário, Lavras, BrazilForestry Department, Federal University of Lavras, Câmpus Universitário, Lavras, BrazilSchool of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD, AustraliaCentre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Melbourne, VIC, AustraliaDepartment of Ecology and Conservation, Federal University of Lavras, Câmpus Universitário, Lavras, BrazilDepartment of Ecology and Conservation, Federal University of Lavras, Câmpus Universitário, Lavras, BrazilThe Atlantic Forest in Brazil is a biodiversity hotspot, yet its diverse ecosystems and species are becoming increasingly threatened by habitat loss and extreme habitat fragmentation. Most habitat patches of Atlantic Forest are dispersed across agricultural landscapes (e.g., grazing and cropping) in relatively small and isolated fragments (80% < 50 ha). Forest fragments < 1 ha, scattered trees in pastures, tree lines on trenches and fences, and remnant riparian forest, collectively called here Small Landscape Elements (SLEs), are very common in this context. While these SLEs make up much of the Atlantic Forests footprint, very little is known about their role or impact on the persistence and conservation of species. In this study, we investigate the role of SLEs on landscape configuration, particularly their contribution toward landscape connectivity of individual species and the genetic flow of species between larger forest fragments. We randomly selected 20 buffers of 707 hectares within a 411,670 hectare area of the Atlantic Forest that was completely covered by forest in the past located in the south of Minas Gerais State, Brazil. The forest cover randomly varied between these buffers. We used graph theory to measure landscape connectivity as the probability of connectivity for different disperser movement types between landscape knots (habitat patches). We used three estimated dispersal distances in the models: pollen disperser insect (50 m), low-mobility seed disperser bird (100 m) and high-mobility seed disperser bird (760 m). The SLEs together increased the probability of connection by roughly 50%, for all model dispersers, if compared to a theoretical baseline landscape containing no SLEs. Of all SLEs, riparian forests contribute the most toward enhancing landscape connectivity. In these highly fragmented landscapes, such as the Atlantic Forest (>70%), the position of SLEs within the landscapes was more important than their respective areas for connectivity. Although the landscapes were deeply fragmented, we showed that the presence of SLEs can increase connectivity and reduce further biodiversity loss in the Atlantic Forest.https://www.frontiersin.org/articles/10.3389/fevo.2021.614362/fulltropical forestlandscape connectivityprivate land conservationbiodiversity conservationremote sensing-GISfragmentation |
| spellingShingle | Flávia Freire Siqueira Dulcineia de Carvalho Jonathan Rhodes Carla L. Archibald Vanessa Leite Rezende Eduardo van den Berg Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest Frontiers in Ecology and Evolution tropical forest landscape connectivity private land conservation biodiversity conservation remote sensing-GIS fragmentation |
| title | Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest |
| title_full | Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest |
| title_fullStr | Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest |
| title_full_unstemmed | Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest |
| title_short | Small Landscape Elements Double Connectivity in Highly Fragmented Areas of the Brazilian Atlantic Forest |
| title_sort | small landscape elements double connectivity in highly fragmented areas of the brazilian atlantic forest |
| topic | tropical forest landscape connectivity private land conservation biodiversity conservation remote sensing-GIS fragmentation |
| url | https://www.frontiersin.org/articles/10.3389/fevo.2021.614362/full |
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