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  1. Article: Long distance pollen dispersal and intrapopulation genetic structure determined by clonal diversity in Hymenaea stigonocarpa populations of the Brazilian savanna

    Moreno, Maria A. / Boshier, David / Tarazi, Roberto / Tambarussi, Evandro V. / Aguiar, Bruna I. / Ferraz, Elza M. / Kageyama, Paulo Y. / Sebbenn, Alexandre M.

    Trees. 2022 Feb., v. 36, no. 1

    2022  

    Abstract: KEY MESSAGE: Although all populations show extensive pollen immigration, the occurrence of spatial genetic structure and biparental inbreeding decreased genetic diversity and effective population size. The Brazilian savanna is the second largest ... ...

    Abstract KEY MESSAGE: Although all populations show extensive pollen immigration, the occurrence of spatial genetic structure and biparental inbreeding decreased genetic diversity and effective population size. The Brazilian savanna is the second largest Neotropical biome, and a globally important biodiversity hotspot. Basic knowledge of the ecology and genetics of its species can help conserve this important biome. We investigated genetic diversity, spatial genetic structure (SGS), pollen dispersal, and mating system in three Hymenaea stigonocarpa populations (AS, PE, IT) in the Brazilian savanna, using microsatellite loci and samples of adult trees from all populations and seeds from the IT population. As a result of the long geographic distance between populations, the genetic differentiation among them was high (0.397). Individuals of the IT population presented a grouped distribution due to root propagation, resulting in low genotypic richness ([Formula: see text] = 0.194) and allelic richness ([Formula: see text] = 4), and high SGS ([Formula: see text] = 0.064) compared to AS and PE ([Formula: see text] > 0.98, R > 5, [Formula: see text] < 0.026) populations. The IT population showed high pollen immigration (46.4%), pollen dispersal distance (up to 3.57 km), and outcrossing rate (0.934–1.0), but matings were correlated (0.01–1), and some occurred among relatives (up to 0.098), resulting in some inbred seeds (0.140), a lower variance effective population size ([Formula: see text] = 3.02) than expected with random mating, and an estimate of 50 seed-trees required to retain an [Formula: see text] of 150 in samples of maternal progeny. The estimated minimum viable area to retain a reference ([Formula: see text]) of 1000 indicates that the current AS and IT population areas are insufficient to maintain viable populations in the long-term, demonstrating the importance of maintaining surrounding areas for conservation of these H. stigonocarpa populations.
    Keywords Hymenaea stigonocarpa ; Neotropics ; adults ; biodiversity ; ecosystems ; effective population size ; genetic structure ; genetic variation ; microsatellite repeats ; outcrossing ; pollen flow ; progeny ; savannas ; seed trees ; variance
    Language English
    Dates of publication 2022-02
    Size p. 471-484.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 90595-1
    ISSN 1432-2285 ; 0931-1890
    ISSN (online) 1432-2285
    ISSN 0931-1890
    DOI 10.1007/s00468-021-02222-8
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4635: Show issues

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  2. Article: The Effects of Habitat Loss on Genetic Diversity and Population Structure of Cedrela fissilis Vell

    Gandara, Flávio Bertin / Da-Silva, Paulo Roberto / de Moura, Tânia Maria / Pereira, Fernanda Bortolanza / Gobatto, Cláudia Regina / Ferraz, Elza M / Kageyama, Paulo Y / Tambarussi, Evandro Vagner

    Tropical plant biology. 2019 Dec., v. 12, no. 4

    2019  

    Abstract: Cedrela fissilis Vell. has a wide distribution in South and Central America, and in neotropical forests the species occurs at a low density. Its wood is one of the most valued around the world, and the species is currently at risk of extinction due to ... ...

    Abstract Cedrela fissilis Vell. has a wide distribution in South and Central America, and in neotropical forests the species occurs at a low density. Its wood is one of the most valued around the world, and the species is currently at risk of extinction due to both habitat fragmentation and illegal logging. Considering the need for conservation strategies, this study aims to investigate the genetic structure, diversity, and inbreeding in C. fissilis populations from the Atlantic Forest. To do this, nine microsatellite loci were used to genotype 289 individuals from eight undisturbed and disturbed fragments. Two of the eight populations harbor most of the genetic diversity: one includes most of the diversity present in all populations and the other is isolated but with high levels of diversity. Genetic diversity was higher within than among populations, with observed and expected heterozygosities ranging from 0.48 to 0.63 and from 0.55 to 0.70, respectively. We detected a significant fixation index, ranging from 0.08 to 0.24 and 32% of the observed alleles were exclusive of some population. The populations showed moderate genetic structure (FST = 0.10) and the Bayesian analysis grouped the studied individuals into three distinct genetic clusters that seem to be related to the presence of geographical barriers. The overall analyses of the results allow us to conclude that protecting only isolated fragments, either large or small, may be ineffective for conserving the C. fissilis gene pool in the studied region. This observation suggests that an appropriate strategy to conserve the gene pool of the species is to maintain both the Atlantic Forest green belt in the eastern portion of the Central and South region of this biome, where the forest is not highly fragmented, as well as the remaining forest areas to the west of the Paraná River.
    Keywords Bayesian theory ; Cedrela fissilis ; alleles ; ecosystems ; gene pool ; genetic structure ; genetic variation ; habitat destruction ; habitat fragmentation ; heterozygosity ; inbreeding ; logging ; microsatellite repeats ; population structure ; rivers ; threatened species ; tropical forests ; wood ; Central America ; Parana River
    Language English
    Dates of publication 2019-12
    Size p. 282-292.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2455624-5
    ISSN 1935-9764 ; 1935-9756
    ISSN (online) 1935-9764
    ISSN 1935-9756
    DOI 10.1007/s12042-019-09234-2
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Long-distance dispersal in a fire- and livestock-protected savanna.

    Tarazi, Roberto / Sebbenn, Alexandre M / Kageyama, Paulo Y / Vencovsky, Roland

    Ecology and evolution

    2013  Volume 3, Issue 4, Page(s) 1003–1015

    Abstract: Savannas are highly diverse and dynamic environments that can shift to forest formations due to protection policies. Long-distance dispersal may shape the genetic structure of these new closed forest formations. We analyzed eight microsatellite loci ... ...

    Abstract Savannas are highly diverse and dynamic environments that can shift to forest formations due to protection policies. Long-distance dispersal may shape the genetic structure of these new closed forest formations. We analyzed eight microsatellite loci using a single-time approach to understand contemporary pollen and effective seed dispersal of the tropical tree, Copaifera langsdorffii Desf. (Fabaceae), occurring in a Brazilian fire- and livestock-protected savanna. We sampled all adult trees found within a 10.24 ha permanent plot, young trees within a subplot of 1.44 ha and open-pollinated seeds. We detected a very high level of genetic diversity among the three generations in the studied plot. Parentage analysis revealed high pollen immigration rate (0.64) and a mean contemporary pollen dispersal distance of 74 m. In addition, half-sib production was 1.8 times higher than full-sibs in significant higher distances, indicating foraging activity preference for different trees at long distances. There was a significant and negative correlation between diameter at breast height (DBH) of the pollen donor with the number of seeds (r = -0.640, P-value = 0.032), suggesting that pollen donor trees with a higher DBH produce less seeds. The mean distance of realized seed dispersal (recruitment kernel) was 135 m due to the large home range dispersers (birds and mammals) in the area. The small magnitude of spatial genetic structure found in young trees may be a consequence of overlapping seed shadows and increased tree density. Our results show the positive side of closed canopy expansion, where animal activities regarding pollination and seed dispersal are extremely high.
    Language English
    Publishing date 2013-03-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 2635675-2
    ISSN 2045-7758
    ISSN 2045-7758
    DOI 10.1002/ece3.515
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: The effects of pollen dispersal and mating pattern on inbreeding depression and hybrid vigor in Balfourodendron riedelianum (Engl.) Engl. (Rutaceae)

    Aguiar, Bruna I / Freitas, Miguel L. M / Zannato, Antonio S / Tambarussi, Evandro V / Moraes, Mario L. T / Ambrosano, Marcelo N / Pereira, Lya C. S. M / Gandara, Flávio B / Kageyama, Paulo Y / Sebbenn, Alexandre M

    Conservation genetics. 2020 Apr., v. 21, no. 2

    2020  

    Abstract: Worldwide, the significant fragmentation of tropical forests has resulted in the isolation of tree populations; this in turn has affected genetic diversity due to increases in inbreeding, leading to inbreeding depression (ID). Ex situ provenance and ... ...

    Abstract Worldwide, the significant fragmentation of tropical forests has resulted in the isolation of tree populations; this in turn has affected genetic diversity due to increases in inbreeding, leading to inbreeding depression (ID). Ex situ provenance and progeny trials are an effective strategy for population genetic conservation that can help combat the negative impacts of forest fragmentation on tree populations. Balfourodendron riedelianum is an endangered tree of the Atlantic Forest, for which conservation and environmental reforestation strategies are needed to ensure the preservation of the species. Microsatellite loci were used to genotype adult trees and descendant seedlings in an ex situ provenance and progeny trial located in São Paulo State, Brazil. The aim was to inform seed production management strategies for environmental restoration based on estimates of effective population size (Nₑ), pollen dispersal, mating pattern and ID for the traits root collar circumference (RCC) and plant height (H). The Nₑ (148.9) is adequate for sort-term ex situ conservation. Seedlings were predominantly outcrossed (93–96.2%), but selfing (3.8–7%) and mating between relatives (20–28.1%) show that the species is self-compatible. Pollen was dispersed through a pattern of isolation by distance. Selfed and biparental inbred seedlings showed lower values of RCC (2.98–3.10 mm) and observed heterozygosity (Hₒ = 0.25–0.34), and higher fixation index (F = 0.29–0.61) than seedlings from mating between unrelated trees (RCC = 3.30 mm, Hₒ = 0.51, F = 0.07). Mating among full-sibs showed the highest ID (8.1–12.4%). In the studied provenance and progeny trial, the selection of one tree per plot can minimize the production of biparental inbred seeds. Our results show that the provenance and progeny trial can serve as a seed source for environmental restoration.
    Keywords Balfourodendron riedelianum ; effective population size ; endangered species ; ex situ conservation ; genetic variation ; germplasm conservation ; habitat fragmentation ; heterosis ; heterozygosity ; inbreeding ; inbreeding depression ; mature plants ; microsatellite repeats ; plant height ; pollen ; pollen flow ; progeny ; provenance ; reforestation ; root crown ; seedlings ; seeds ; selfing ; trees ; tropical forests ; Brazil
    Language English
    Dates of publication 2020-04
    Size p. 305-317.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 2059560-8
    ISSN 1572-9737 ; 1566-0621
    ISSN (online) 1572-9737
    ISSN 1566-0621
    DOI 10.1007/s10592-020-01250-0
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7626: Show issues

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  5. Article ; Online: Sistema de reprodução em população natural de Chorisia speciosa A. St.-Hil. (Bombacaceae)

    Souza Lina M.F.I. / Kageyama Paulo Y. / Sebbenn Alexandre M.

    Revista Brasileira de Botânica, Vol 26, Iss 1, Pp 113-

    2003  Volume 121

    Abstract: O objetivo do presente trabalho foi avaliar a taxa de cruzamento de uma população de Chorisia speciosa por marcadores isoenzimáticos. Foram amostradas sementes de polinização aberta em 28 árvores e tecidos foliares em 53 árvores adultas de uma população ... ...

    Abstract O objetivo do presente trabalho foi avaliar a taxa de cruzamento de uma população de Chorisia speciosa por marcadores isoenzimáticos. Foram amostradas sementes de polinização aberta em 28 árvores e tecidos foliares em 53 árvores adultas de uma população de C. speciosa localizada na Estação Ecológica de Bauru, São Paulo, Brasil. Observou-se 18 alelos distribuídos em sete locos polimórficos. O índice de fixação ( ) foi menor nos adultos em relação às progênies, sugerindo seleção contra homozigotos. A estimativa da taxa de cruzamento multilocos ( ) foi de 0,816, revelando que a espécie é de reprodução mista, predominantemente alógama. Foi detectada heterogeneidade no conjunto de pólen dos cruzamentos, indicando que os mesmos não foram aleatórios. Em concordância, a correlação de paternidade ( ) revelou que as progênies são constituídas por uma alta proporção de irmãos completos (71,4%). Foram também detectados cruzamentos entre aparentados na população (5,6%), sugerindo uma possível estruturação espacial em famílias.
    Keywords Chorisia speciosa ; eletroforese de isosimas ; genética de populações ; linhagens correlacionadas ; taxa de crescimento ; Botany ; QK1-989 ; Science ; Q ; DOAJ:Botany ; DOAJ:Biology ; DOAJ:Biology and Life Sciences
    Language Portuguese
    Publishing date 2003-01-01T00:00:00Z
    Publisher Sociedade Botânica de São Paulo
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: What Role Should Government Regulation Play in Ecological Restoration? Ongoing Debate in São Paulo State, Brazil

    Aronson, James / Brancalion, Pedro H. S / Durigan, Giselda / Rodrigues, Ricardo R / Engel, Vera L / Tabarelli, Marcelo / Torezan, José M. D / Gandolfi, Sergius / de Melo, Antônio C. G / Kageyama, Paulo Y / Marques, Márcia C. M / Nave, André G / Martins, Sebastião V / Gandara, Flávio B / Reis, Ademir / Barbosa, Luiz M / Scarano, Fabio R

    Restoration ecology. 2011 Nov., v. 19, no. 6

    2011  

    Abstract: Around the world, there is growing desire and momentum for ecological restoration to happen faster, with better quality, and in more extensive areas. The question we ask is how can laws and governmental regulations best contribute to effective, ... ...

    Abstract Around the world, there is growing desire and momentum for ecological restoration to happen faster, with better quality, and in more extensive areas. The question we ask is how can laws and governmental regulations best contribute to effective, successful, and broad‐scale restoration? In the state of São Paulo, Brazil, there is a legal instrument (SMA 08‐2008) whose aim is to increase the effectiveness of tropical forest restoration projects in particular. It establishes, among other things, requirements regarding the minimum number of native tree species to be reached within a given period of time in restoration projects and the precise proportion of functional groups or threatened species to be included when reforestation with native species is used as a restoration technique. There are, however, two differing perspectives among Brazilian restoration ecologists on the appropriateness of such detailed legal rules. For some, the rules help increase the chances that mandatory projects of ecological restoration will succeed. For the other group, there is no single way to achieve effective ecosystem restoration, and the existing science and know‐how are far from sufficient to establish standardized technical and methodological norms or to justify that such norms be imposed. Both points of view are discussed here, aiming to help those developing new legislation and improving existing laws about ecological restoration. The precedents established in São Paulo, and at the federal level in Brazil, and the ongoing debate about those laws are worth considering and possibly applying elsewhere.
    Keywords cans ; ecologists ; ecosystems ; forest restoration ; indigenous species ; laws and regulations ; reforestation ; sodium monochloroacetate ; threatened species ; tropical forests ; Brazil
    Language English
    Dates of publication 2011-11
    Size p. 690-695.
    Publishing place Blackwell Publishing Ltd
    Document type Article
    ZDB-ID 914746-9
    ISSN 1526-100X ; 1061-2971
    ISSN (online) 1526-100X
    ISSN 1061-2971
    DOI 10.1111/j.1526-100X.2011.00815.x
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    In stock of ZB MED Bonn / Germany

    Z 6111: Show issues

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