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  1. Article: Forest cover and non-forest landscape heterogeneity modulate pollination of tropical understory plants

    Soares, Raimunda G. S. / Ferreira, Patrícia A. / Boscolo, Danilo / Rocha, Ana C. / Lopes, Luciano E.

    Landscape ecology. 2022 Feb., v. 37, no. 2

    2022  

    Abstract: CONTEXT: In human-altered landscapes, native vegetation cover is essential for pollination maintenance. Heterogeneous land-uses may provide complementary resources for some pollinator species, contributing to the connectivity of landscapes and the ... ...

    Abstract CONTEXT: In human-altered landscapes, native vegetation cover is essential for pollination maintenance. Heterogeneous land-uses may provide complementary resources for some pollinator species, contributing to the connectivity of landscapes and the maintenance of pollination. OBJECTIVES: To investigate the effect of forest cover and non-forest landscape heterogeneity on pollination of native understory forest plant assemblages. METHODS: We quantified pollen deposited on understory native flowers in gradients of forest cover and heterogeneity of land-uses (Shannon–Wiener diversity index) in a central forest patch in 14 landscapes. RESULTS: Forest cover and the non-forest heterogeneity of land-uses interacted, favoring pollination in landscapes with high amount of forest and low heterogeneity, and in landscapes with low amount of forest and high heterogeneity. Forest promotes high-quality habitats and higher connectivity for pollinators, increasing pollination. Forest cover and non-forest landscape heterogeneity seemed to increase pollinator efficiency, since pollination increased regardless of pollinator diversity. In landscapes with a low amount of forest, high land-use heterogeneity may partially compensate for forest loss due to land-uses that offered complementary resources for the maintenance of pollinators and pollination. CONCLUSIONS: We have seen that pollination is favored by forest cover and the interaction between native forest and other land-uses that can add complementary resources and landscape connectivity to pollinators. For management policies, priority should be on the maintenance and increase of native forest cover in the landscapes, followed by promoting heterogeneity of other favorable land-uses to pollinators.
    Keywords forests ; habitat connectivity ; indigenous species ; land use ; landscape ecology ; landscapes ; pollen ; pollination ; pollinators ; understory ; vegetation cover
    Language English
    Dates of publication 2022-02
    Size p. 393-409.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1027798-5
    ISSN 1572-9761 ; 0921-2973
    ISSN (online) 1572-9761
    ISSN 0921-2973
    DOI 10.1007/s10980-021-01356-x
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Impacts of deforestation on plant-pollinator networks assessed using an agent based model.

    Newton, Adrian C / Boscolo, Danilo / Ferreira, Patrícia A / Lopes, Luciano E / Evans, Paul

    PloS one

    2018  Volume 13, Issue 12, Page(s) e0209406

    Abstract: Plant-pollinator networks have been widely used to understand the ecology of mutualistic interactions between plants and animals. While a number of general patterns have been identified, the mechanisms underlying the structure of plant-pollinator ... ...

    Abstract Plant-pollinator networks have been widely used to understand the ecology of mutualistic interactions between plants and animals. While a number of general patterns have been identified, the mechanisms underlying the structure of plant-pollinator networks are poorly understood. Here we present an agent based model (ABM) that simulates the movement of bees over heterogeneous landscapes and captures pollination events, enabling the influence of landscape pattern on pollination networks to be explored. Using the model, we conducted a series of experiments using virtual landscapes representing a gradient of forest loss and fragmentation. The ABM was able to produce expected trends in network structure, from simulations of interactions between individual plants and pollinators. For example, results indicated an increase in the index of complementary specialization (H2') and a decline in network connectance with increasing forest cover. Furthermore, network nestedness was not associated with the degree of forest cover, but was positively related to forest patch size, further supporting results obtained in the field. This illustrates the potential value of ABMs for exploring the structure and dynamics of plant-pollinator networks, and for understanding the mechanisms that underlie them. We attribute the results obtained primarily to a shift from specialist to generalist pollinators with increasing forest loss, a trend that has been observed in some field situations.
    MeSH term(s) Animals ; Bees/physiology ; Conservation of Natural Resources ; Ecosystem ; Forests ; Humans ; Plant Physiological Phenomena ; Pollination/physiology ; Symbiosis/physiology ; Systems Analysis
    Language English
    Publishing date 2018-12-31
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0209406
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  3. Article: Variation in pollinator assemblages in a fragmented landscape and its effects on reproductive stages of a self-incompatible treelet, Psychotria suterella (Rubiaceae).

    Lopes, Luciano E / Buzato, Silvana

    Oecologia

    2007  Volume 154, Issue 2, Page(s) 305–314

    Abstract: Few studies of plant-pollinator interactions in fragmented landscapes evaluate the consequences of floral visitor variation on multiple stages of plant reproduction. Given that fragmentation potentially has positive or negative effects on different ... ...

    Abstract Few studies of plant-pollinator interactions in fragmented landscapes evaluate the consequences of floral visitor variation on multiple stages of plant reproduction. Given that fragmentation potentially has positive or negative effects on different organisms, and that self-incompatible plant species depend on pollinators for sexual reproduction, differences in floral visitor assemblages may affect certain plant reproductive stages. We evaluated how pollinator assemblage, availability of floral resources, pollination, reproductive output, and seed and seedling performance of Psychotria suterella Muell. Arg. varied among three fragmentation categories: non-fragmented habitats, fragments connected by corridors, and isolated fragments. Richness and frequency of floral visitors were greater in fragments than in non-fragmented sites, resulting mainly from the addition of species typically found in disturbed areas. Although 24 species visited Psychotria suterella flowers, bumblebees were considered the most important pollinators, because they showed the highest frequency of visits and were present in eight out of ten sites. Additionally, the number of pollen tubes per flower per visit was lower in areas without bumblebees. The increased visitation in fragments seemed to enhance pollination slightly. However, fruit and seed output, germination, and seed and seedling mass were similar in non-fragmented sites, connected sites, and isolated fragments. Our results suggested that, even for a self-incompatible species, responses to habitat fragmentation at different stages of plant reproduction might be decoupled from the responses observed in floral visitors, if fruit set is not pollen limited. If all reproductive stages were considered, variation on the small scale was more important than the variation explained by fragmentation category. In spite of its self-incompatible breeding system, this plant-pollinator system showed resilience to habitat fragmentation, mainly as a result of high availability of potential mates to P. suterella individuals, absence of pollen limitation, and the presence of bumblebees (Bombus spp.) throughout this highly connected landscape.
    MeSH term(s) Animals ; Bees/physiology ; Brazil ; Ecosystem ; Linear Models ; Pollination/physiology ; Population Density ; Psychotria/growth & development ; Psychotria/physiology
    Language English
    Publishing date 2007-11
    Publishing country Germany
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-007-0830-z
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  4. Article: Variation in pollinator assemblages in a fragmented landscape and its effects on reproductive stages of a self-incompatible treelet, Psychotria suterella (Rubiaceae)

    Lopes, Luciano E / Buzato, Silvana

    Oecologia. 2007 Nov., v. 154, no. 2

    2007  

    Abstract: Few studies of plant-pollinator interactions in fragmented landscapes evaluate the consequences of floral visitor variation on multiple stages of plant reproduction. Given that fragmentation potentially has positive or negative effects on different ... ...

    Abstract Few studies of plant-pollinator interactions in fragmented landscapes evaluate the consequences of floral visitor variation on multiple stages of plant reproduction. Given that fragmentation potentially has positive or negative effects on different organisms, and that self-incompatible plant species depend on pollinators for sexual reproduction, differences in floral visitor assemblages may affect certain plant reproductive stages. We evaluated how pollinator assemblage, availability of floral resources, pollination, reproductive output, and seed and seedling performance of Psychotria suterella Muell. Arg. varied among three fragmentation categories: non-fragmented habitats, fragments connected by corridors, and isolated fragments. Richness and frequency of floral visitors were greater in fragments than in non-fragmented sites, resulting mainly from the addition of species typically found in disturbed areas. Although 24 species visited Psychotria suterella flowers, bumblebees were considered the most important pollinators, because they showed the highest frequency of visits and were present in eight out of ten sites. Additionally, the number of pollen tubes per flower per visit was lower in areas without bumblebees. The increased visitation in fragments seemed to enhance pollination slightly. However, fruit and seed output, germination, and seed and seedling mass were similar in non-fragmented sites, connected sites, and isolated fragments. Our results suggested that, even for a self-incompatible species, responses to habitat fragmentation at different stages of plant reproduction might be decoupled from the responses observed in floral visitors, if fruit set is not pollen limited. If all reproductive stages were considered, variation on the small scale was more important than the variation explained by fragmentation category. In spite of its self-incompatible breeding system, this plant-pollinator system showed resilience to habitat fragmentation, mainly as a result of high availability of potential mates to P. suterella individuals, absence of pollen limitation, and the presence of bumblebees (Bombus spp.) throughout this highly connected landscape.
    Keywords habitat fragmentation ; pollination
    Language English
    Dates of publication 2007-11
    Size p. 305-314.
    Publisher Springer-Verlag
    Publishing place Berlin/Heidelberg
    Document type Article
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-007-0830-z
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 70/109: Show issues

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    Inter-library loan at ZB MED

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