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  1. Article: Burning for grassland pollination: Recently burned patches promote plant flowering and insect pollinators

    Goldas, Camila da Silva / Podgaiski, Luciana Regina

    Austral ecology. 2022 May, v. 47, no. 3

    2022  

    Abstract: Grasslands are historically and evolutionarily associated with disturbances, such as fire, that drive biodiversity assembly patterns and biotic interactions. Disturbance suppression in fire‐prone ecosystems usually leads to a decline in forb diversity ... ...

    Abstract Grasslands are historically and evolutionarily associated with disturbances, such as fire, that drive biodiversity assembly patterns and biotic interactions. Disturbance suppression in fire‐prone ecosystems usually leads to a decline in forb diversity and flowering due to biomass accumulation, which could jeopardise pollinator diversity. In this study, we investigated patterns and drivers of plant flowering and flower insect visitor communities in a chronosequence of patches from different time‐since‐fire categories in Southern Brazilian grasslands. Old‐burnt patches (more than 2 years since fire) had taller vegetation, more biomass and grass cover than intermediate (about 1 year after fire) and freshly‐burnt patches (less than 6 months since fire), which had increased bare soil cover. Forb flower abundance was much higher in freshly burnt patches, directly predicted by the degree of habitat openness. Pollinator insects were then benefited by floral resource aggregation in freshly burnt patches, increasing in abundance (bees and butterflies) and species richness (bees). Beetle communities were positively influenced by vegetation height. Furthermore, plant species flowering and bee species composition varied between freshly and old‐burnt grasslands, with indicator species found for all recovery stages but mainly freshly‐burnt patches. Altogether, these results indicate the importance of maintaining freshly‐burnt patches in the grassland landscape: it helps to sustain flower diversity, pollination services and flowering plant reproduction. Our findings support the idea that a mosaic of grasslands from different times‐since‐fire should be considered for grassland conservation.
    Keywords bees ; biomass production ; chronosequences ; flowers ; forbs ; grasses ; grasslands ; habitats ; indicator species ; landscapes ; pollination ; soil ; species richness
    Language English
    Dates of publication 2022-05
    Size p. 491-506.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2019899-1
    ISSN 1442-9993 ; 1442-9985
    ISSN (online) 1442-9993
    ISSN 1442-9985
    DOI 10.1111/aec.13108
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: How do patch burnings affect ant communities and seed removal in a subtropical grassland?

    Barbosa, Gabriel Gonçalves / Ferrando, Claire Pauline Röpke / Mendonça, Milton de Souza / Podgaiski, Luciana Regina

    Associação Brasileira de Ciência Ecológica e Conservação Perspectives in ecology and conservation. 2022 July 26,

    2022  

    Abstract: Disturbances modify local abiotic properties, habitat structure and resource availability, shaping community assembly and ecological interactions. Open ecosystems have an evolutionary relationship with fire. We evaluated the effects of patch burnings on ... ...

    Abstract Disturbances modify local abiotic properties, habitat structure and resource availability, shaping community assembly and ecological interactions. Open ecosystems have an evolutionary relationship with fire. We evaluated the effects of patch burnings on grassland ant communities and patterns of seed removal. We established 14 plots of 10 m² in pairs in a disturbance-suppressed grassland in South Brazil. A random plot of each pair was burned, and another plot was the control. We accessed ant communities with pitfall-traps and sweeping net, and seed removal with seed traps in all plots prior the experimental fires, and then on three occasions following fires. We recorded 57 ant species belonging to 29 genera. Ant species composition did not significantly vary between treatments neither did ant body size. We detected significantly positive fire effects on ant richness after 1 month and 12 months, mediated by the increase in plant species richness in burned plots. Mean seed removal rates were increased in burned plots after 1 month. We showed that prescribed patch burnings in fire-prone grasslands promoted ant richness, and their foraging activity. Our study may serve as a basis for conservation decisions, showing the importance of maintenance of disturbances in grasslands.
    Keywords body size ; grasslands ; habitats ; pitfall traps ; species richness ; Brazil
    Language English
    Dates of publication 2022-0726
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ISSN 2530-0644
    DOI 10.1016/j.pecon.2022.07.002
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Ants benefit from the Japanese raisin tree invasion and favor its invasiveness in the subtropical Atlantic Rainforest

    Podgaiski, Luciana Regina / Guimarães, Gabriel de Carvalho / Dröse, William / Pereira Almerão, Mauricio

    Biotropica. 2022 Mar., v. 54, no. 2

    2022  

    Abstract: Biological invasions are among the main drivers of biodiversity losses, which can be caused by alterations in habitat structure. Animal–plant mutualistic interactions created in recipient communities may enhance alien species invasiveness. In this study, ...

    Abstract Biological invasions are among the main drivers of biodiversity losses, which can be caused by alterations in habitat structure. Animal–plant mutualistic interactions created in recipient communities may enhance alien species invasiveness. In this study, we investigate the relationships between the Japanese raisin tree (Hovenia dulcis) and ground‐foraging ant communities in the Atlantic Rainforest. Seven paired sites (n = 14) of invaded and uninvaded forests (control) were chosen. We sampled ant communities with pitfall traps in those sites during 2018 wintertime, before (June) and after H. dulcis infructescences fall on the forest floor (July). In June, leaf‐litter mass of invaded sites was higher, but ant diversity and composition were not affected. In July, leaf‐litter mass reduced, and infructescence offer triggered a higher ant diversity and distinct ant species composition in invaded sites. We additionally performed an experiment to understand the potential use of H. dulcis diaspores by ant species. We recorded 19 species exploiting H. dulcis diaspores, of which 18 consumed the fleshy peduncle in situ, and two removed diaspores for distances >1 cm. Our study indicates the invasion did not negatively affect ant communities by altering the leaf‐litter layer. On the contrary, ant communities benefited from the high‐resource availability during exposure to cold stress. Ant–H. dulcis diaspore interactions could further contribute to seed germination and propagule establishment, potentially enhancing H. dulcis invasiveness. Abstract in Portuguese is available with online material.
    Keywords Hovenia dulcis ; cold stress ; forest litter ; habitats ; introduced species ; peduncle ; rain forests ; seed germination ; species diversity ; winter
    Language English
    Dates of publication 2022-03
    Size p. 392-404.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2052061-X
    ISSN 1744-7429 ; 0006-3606
    ISSN (online) 1744-7429
    ISSN 0006-3606
    DOI 10.1111/btp.13061
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Grassland afforestation with Eucalyptus affect Collembola communities and soil functions in southern Brazil

    Jorge, Bruna Claudia S. / Winck, Bruna Raquel / da Silva Menezes, Luciana / Bellini, Bruno C. / Pillar, Valério D. / Podgaiski, Luciana Regina

    Biodivers Conserv. 2023 Jan., v. 32, no. 1 p.275-295

    2023  

    Abstract: Afforestation of subtropical grasslands increased during the last decade and their impacts on soil biota and functions are not well known. Here we investigated the effects of grassland afforestation with Eucalyptus on soil Collembola communities in ... ...

    Abstract Afforestation of subtropical grasslands increased during the last decade and their impacts on soil biota and functions are not well known. Here we investigated the effects of grassland afforestation with Eucalyptus on soil Collembola communities in southern Brazil. By using paired transects (native grassland vs. plantation), we assessed Collembola taxonomic and functional composition and diversity and their relations with plant diversity and soil microbial and physical–chemical parameters. Eucalyptus plantations significantly decreased plant richness, soil pH, and soil temperature. Microbial biomass, soil basal respiration and enzyme activities were negatively affected by grassland afforestation, which may indicate an effect on decomposition, soil fertility, and carbon stock. At a regional scale, grassland afforestation diminished the richness, and at a local scale changed the taxonomic and functional composition of Collembola communities. An environmental filtering mechanism is suggested triggering trait turnover from open (grassland) to a closed canopy habitat (tree plantation). While grassland presented high abundance of larger, eyed, and pigmented Collembola, Eucalyptus favored smaller, blind, and non-pigmented Collembola with shadow-adapted sensorial structures. Our results on afforestation effects in subtropical grasslands are similar to those described for temperate zone, and may underpin the development of conservation strategies for land-use on subtropical grasslands.
    Keywords Collembola ; Eucalyptus ; afforestation ; canopy ; carbon sinks ; enzymes ; grasslands ; habitats ; land use ; microbial biomass ; plantations ; soil biota ; soil fertility ; soil pH ; soil respiration ; soil temperature ; species diversity ; temperate zones ; Brazil
    Language English
    Dates of publication 2023-01
    Size p. 275-295.
    Publishing place Springer Netherlands
    Document type Article ; Online
    ZDB-ID 2000787-5
    ISSN 1572-9710 ; 0960-3115
    ISSN (online) 1572-9710
    ISSN 0960-3115
    DOI 10.1007/s10531-022-02501-x
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Local and regional drivers of ant communities in forest-grassland ecotones in South Brazil: A taxonomic and phylogenetic approach.

    Dröse, William / Podgaiski, Luciana Regina / Dias, Camila Fagundes / Mendonça, Milton de Souza

    PloS one

    2019  Volume 14, Issue 4, Page(s) e0215310

    Abstract: Understanding biological community distribution patterns and their drivers across different scales is one of the major goals of community ecology in a rapidly changing world. Considering natural forest-grassland ecotones distributed over the south ... ...

    Abstract Understanding biological community distribution patterns and their drivers across different scales is one of the major goals of community ecology in a rapidly changing world. Considering natural forest-grassland ecotones distributed over the south Brazilian region we investigated how ant communities are assembled locally, i.e. considering different habitats, and regionally, i.e. considering different physiographic regions. We used taxonomic and phylogenetic approaches to investigate diversity patterns and search for environmental/spatial drivers at each scale. We sampled ants using honey and tuna baits in forest and grassland habitats, in ecotones distributed at nine sites in Rio Grande do Sul state, Brazil. Overall, we found 85 ant species belonging to 23 genera and six subfamilies. At the local scale, we found forests and grasslands as equivalent in ant species and evolutionary history diversities, but considerably different in terms of species composition. In forests, the soil surface air temperature predicts foraging ant diversity. In grasslands, while the height of herbaceous vegetation reduces ant diversity, treelet density from forest expansion processes clearly increases it. At a regional scale, we did not find models that sufficiently explained ant taxonomic and phylogenetic diversity based on regional environmental variables. The variance in species composition, but not in evolutionary histories, across physiographic regions is driven by space and historical processes. Our findings unveil important aspects of ant community ecology in natural transition systems, indicating environmental filtering as an important process structuring the communities at the local scale, but mostly spatial processes acting at the regional scale.
    MeSH term(s) Animals ; Ants/classification ; Biota ; Brazil ; Ecosystem ; Forests ; Grassland ; Phylogeny
    Language English
    Publishing date 2019-04-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0215310
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: The role of a rosette‐shaped plant (Eryngium horridum, Apiaceae) on grassland spiders along a grazing intensity gradient

    da Silva Bomfim, Leoni / Bitencourt, JoÃo Anacleto Gomez / Rodrigues, Everton Nei Lopes / Podgaiski, Luciana Regina

    Insect conservation and diversity. 2021 July, v. 14, no. 4

    2021  

    Abstract: Rosette‐shaped plants can amplify the diversity of predator arthropods and act as potential shelters for these animals in grassland ecosystems under grazing effect. Here we evaluated the contribution of a vertical rosette‐shaped plant (Eryngium horridum) ...

    Abstract Rosette‐shaped plants can amplify the diversity of predator arthropods and act as potential shelters for these animals in grassland ecosystems under grazing effect. Here we evaluated the contribution of a vertical rosette‐shaped plant (Eryngium horridum) to patterns of spider diversity and functional traits in subtropical grasslands under different grazing intensities. We used a common sub‐shrub (Baccharis crispa) and the herbaceous vegetation as reference microhabitats. Sampling was conducted in 23 plots described according to grazing intensity based on environmental co‐variables. Spiders were sampled with D‐Vac suction within patches of E. horridum, B. crispa, and the herbaceous vegetation. Compared to the reference microhabitats, E. horridum harboured distinct community composition with a subset of exclusive species, and morphologically adapted spiders. Spider richness increased in Eryngium plants as grazing pressure increased and the grassland became more simplified. Abundance of runners and space web‐builders responded in a similar fashion, while orb‐web builders were more abundant in E. horridum regardless of grazing intensity. Our results indicate that these rosette plants positively affect top invertebrate predators, with a special role for sites with high grazing intensities where it promotes microhabitat complexity and aggregates more individuals and species. Thus, grassland management that alter Eryngium's occurrence must be conducted cautiously.
    Keywords Baccharis ; Eryngium ; community structure ; grassland management ; grasslands ; insects ; microhabitats ; spiders
    Language English
    Dates of publication 2021-07
    Size p. 492-503.
    Publishing place John Wiley & Sons, Ltd.
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2411024-3
    ISSN 1752-4598 ; 1752-458X
    ISSN (online) 1752-4598
    ISSN 1752-458X
    DOI 10.1111/icad.12475
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  7. Article: Structural resilience and high interaction dissimilarity of plant–pollinator interaction networks in fire-prone grasslands

    da Silva Goldas, Camila / Podgaiski, Luciana Regina / Veronese Corrêa da Silva, Carolina / Abreu Ferreira, Pedro Maria / Vizentin-Bugoni, Jeferson / de Souza Mendonça, Milton, Jr

    Oecologia. 2022 Jan., v. 198, no. 1

    2022  

    Abstract: Fire is a frequent disturbance in most grasslands around the world, being key for the structure and dynamics of the biodiversity in such ecosystems. While grassland species may be resilient, little is known on how plant–pollinator networks reassemble ... ...

    Abstract Fire is a frequent disturbance in most grasslands around the world, being key for the structure and dynamics of the biodiversity in such ecosystems. While grassland species may be resilient, little is known on how plant–pollinator networks reassemble after fire. Here, we investigate the structure and dynamics of plant–pollinator networks and the variation in species roles over a 2-year post-fire chronosequence on grassland communities in Southern Brazil. We found that both network specialization and modularity were similar over the chronosequence of time-since-fire, but in freshly burnt areas, there were more species acting as network hubs. Species roles exhibited high variation, with plant and pollinator species shifting roles along the post-disturbance chronosequence. Interaction dissimilarity was remarkably high in networks irrespective of times-since-fire. Interaction dissimilarity was associated more with rewiring than with species turnover, indicating that grassland plant and pollinator species are highly capable of switching partners. Time-since-fire had little influence on network structure but influenced the identity and diversity of pollinators playing key roles in the networks. These findings suggest that pollination networks in naturally fire-prone ecosystems are highly dynamic and resilient to fire with both plants and pollinators being highly capable of adjusting their interactions and network structure after disturbance.
    Keywords biodiversity ; chronosequences ; grasslands ; pollination ; pollinators ; Brazil
    Language English
    Dates of publication 2022-01
    Size p. 179-192.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-021-05071-x
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  8. Article: Effects of time-since-fire on ant-plant interactions in southern Brazilian grasslands

    da Silva, Carolina Veronese Corrêa / da Silva Goldas, Camila / Dáttilo, Wesley / Dröse, William / de Souza Mendonça, Milton / Podgaiski, Luciana Regina

    Ecological indicators. 2020 May, v. 112

    2020  

    Abstract: Grasslands and savannas are dynamic ecosystems, strongly regulated by environmental disturbances such as fire. Maintaining disturbance regimes in these ecosystems are of great conservation concern, and require studies with the use of ecological ... ...

    Abstract Grasslands and savannas are dynamic ecosystems, strongly regulated by environmental disturbances such as fire. Maintaining disturbance regimes in these ecosystems are of great conservation concern, and require studies with the use of ecological indicators. Biotic interactions are a major component of biodiversity that are particularly sensitive to environmental changes, and therefore should be considered in ecosystem assessment and monitoring. One of the most common interactions between insects and plants is mediated by extrafloral nectaries (EFNs), where ants use food resources from plants in exchange for protection against herbivores. Here, we explored variations on this ant-plant interaction across a post-fire successional gradient (i.e., few months to more than two years since the last fire) in eleven grassland patches in South Brazil. We evaluated time-since-fire effects on (i) the grassland habitat structure, (ii) an EFN-bearing plant population: Chamaecrista repens, (iii) the EFN-visiting ant communities, and (iv) the ant-plant ecological networks. We expected fire-induced habitat changes to benefit this plant population, and to produce positive cascading effects on interacting ants, thus influencing the structure of ant-plant networks. Freshly-burnt sites presented increased C. repens abundance, and larger individuals with more reproductive structures and EFNs in comparison with sites longer without disturbances. Plant abundance and size were inversely related to the cover of dominant grasses along the habitat gradient. The density of EFN-visiting ants, but not their species richness, increased in freshly-burnt sites, stimulated by the greater resource offer and the habitat openness, which probably facilitated ant activity. Moreover, with increasing time-since-fire, ants interacted with fewer plants, and few species formed the network generalist core. These results could further suggest that the defense service against herbivory provided by ants is also diminished in grasslands longer without disturbances. Overall, by using a series of indicators of habitat change from multiple ecological levels, this study highlights the importance of disturbance for grassland biodiversity and their ecological interactions, helping to improve management decisions.
    Keywords Chamaecrista ; ecosystems ; grasslands ; habitats ; herbivores ; species richness ; Brazil
    Language English
    Dates of publication 2020-05
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2036774-0
    ISSN 1872-7034 ; 1470-160X
    ISSN (online) 1872-7034
    ISSN 1470-160X
    DOI 10.1016/j.ecolind.2020.106094
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  9. Article ; Online: Structural resilience and high interaction dissimilarity of plant-pollinator interaction networks in fire-prone grasslands.

    da Silva Goldas, Camila / Podgaiski, Luciana Regina / Veronese Corrêa da Silva, Carolina / Abreu Ferreira, Pedro Maria / Vizentin-Bugoni, Jeferson / de Souza Mendonça, Milton

    Oecologia

    2021  Volume 198, Issue 1, Page(s) 179–192

    Abstract: Fire is a frequent disturbance in most grasslands around the world, being key for the structure and dynamics of the biodiversity in such ecosystems. While grassland species may be resilient, little is known on how plant-pollinator networks reassemble ... ...

    Abstract Fire is a frequent disturbance in most grasslands around the world, being key for the structure and dynamics of the biodiversity in such ecosystems. While grassland species may be resilient, little is known on how plant-pollinator networks reassemble after fire. Here, we investigate the structure and dynamics of plant-pollinator networks and the variation in species roles over a 2-year post-fire chronosequence on grassland communities in Southern Brazil. We found that both network specialization and modularity were similar over the chronosequence of time-since-fire, but in freshly burnt areas, there were more species acting as network hubs. Species roles exhibited high variation, with plant and pollinator species shifting roles along the post-disturbance chronosequence. Interaction dissimilarity was remarkably high in networks irrespective of times-since-fire. Interaction dissimilarity was associated more with rewiring than with species turnover, indicating that grassland plant and pollinator species are highly capable of switching partners. Time-since-fire had little influence on network structure but influenced the identity and diversity of pollinators playing key roles in the networks. These findings suggest that pollination networks in naturally fire-prone ecosystems are highly dynamic and resilient to fire with both plants and pollinators being highly capable of adjusting their interactions and network structure after disturbance.
    MeSH term(s) Ecosystem ; Fires ; Grassland ; Plants ; Pollination
    Language English
    Publishing date 2021-11-12
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-021-05071-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Prescribed patch burnings increase thrips species richness and body size in grassland communities

    Podgaiski, Luciana Regina / Adriano Cavalleri / Claire Pauline Röpke Ferrando / Milton de Souza Mendonça Jr / Valério D. Pillar

    Insect conservation and diversity. 2018 Mar., v. 11, no. 2

    2018  

    Abstract: Prescribed patch burning is a well‐known tool for grassland and savanna management that has been recognised as a suitable strategy to enhance biodiversity at landscape‐level scales. Nevertheless, effective monitoring of the biota responses to fire is ...

    Abstract Prescribed patch burning is a well‐known tool for grassland and savanna management that has been recognised as a suitable strategy to enhance biodiversity at landscape‐level scales. Nevertheless, effective monitoring of the biota responses to fire is an essential step towards biodiversity conservation. We investigated fire effects on thrips communities (Thysanoptera) – a group of minute and diverse insect in grasslands. We performed a replicated small‐scale fire experiment in South Brazilian Campos, and tested for fire effects on total abundance, species richness of different feeding guilds (e.g. leaf, flower and fungal feeders) and thrips species body size in the short (1 month) and long‐term (1 year). We found positive fire effects on leaf herbivore richness in recently burned patches where the resprouted vegetation had enhanced nutritional quality, and also later on following the diversification of plant communities. The richness of fungivorous thrips was also benefited by resource heterogeneity in burned patches 1 year after fire. A positive fire effect on thrips community body size was also found at this time, possibly indicating that larger species had an advantage in dispersal to the spatially distributed burned patches across the unburned grassland matrix. Effects on total abundances were not detected. Our study emphasises the role of prescribed patch burnings in producing high quality resource‐rich habitat spots for Thysanoptera communities at local scales.
    Keywords biodiversity conservation ; body size ; burning ; flowers ; fungi ; fungivores ; grasslands ; habitats ; herbivores ; insects ; leaves ; monitoring ; nutritive value ; savannas ; species diversity ; Thysanoptera
    Language English
    Dates of publication 2018-03
    Size p. 204-212.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2411024-3
    ISSN 1752-4598 ; 1752-458X
    ISSN (online) 1752-4598
    ISSN 1752-458X
    DOI 10.1111/icad.12269
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