Estimating the Mean Annual Seed Production of Trees

Greene, David F.; Johnson, Edward A.

doi:10.2307/1941722

Cited by 209 publications

(184 citation statements)

References 16 publications

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“…A clear example is shown in figure 1A. This well-supported seed size/seed number trade-off (Shipley and Dion 1992;Greene and Johnson 1994;Rees 1995;Turnbull et al 1999;Jakobsson and Eriksson 2000;Leishman 2001) gives rise to a competition-colonization trade-off for annual plants.…”

Section: Species Traits and Abundance Patterns In Annual Plant Systemsmentioning

confidence: 88%

Coexistence and Relative Abundance in Annual Plant Assemblages: The Roles of Competition and Colonization

Levine

Rees

2002

The American Naturalist

142

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Article: Levine, J.M. and Rees, M. (2002) Coexistence and relative abundance in annual plant assemblages: The roles of competition and colonization. American Naturalist, 160 (4). pp. [452][453][454][455][456][457][458][459][460][461][462][463][464][465][466][467] eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. abstract: Although an interspecific trade-off between competitive and colonizing ability can permit multispecies coexistence, whether this mechanism controls the structure of natural systems remains unresolved. We used models to evaluate the hypothesized importance of this trade-off for explaining coexistence and relative abundance patterns in annual plant assemblages. In a nonspatial model, empirically derived competition-colonization trade-offs related to seed mass were insufficient to generate coexistence. This was unchanged by spatial structure or interspecific variation in the fraction of seeds dispersing globally. These results differ from those of the more generalized competition-colonization models because the latter assume completely asymmetric competition, an assumption that appears unrealistic considering existing data for annual systems. When, for heuristic purposes, completely asymmetric competition was incorporated into our models, unlimited coexistence was possible. However, in the resulting abundance patterns, the best competitors/poorest colonizers were the most abundant, the opposite of that observed in natural systems. By contrast, these natural patterns were produced by competition-colonization models where environmental heterogeneity permitted species coexistence. Thus, despite the failure of the simple competition-colonization trade-off to explain coexistence in annual plant systems, this trade-off may be essential to explaining relative abundance patterns when other processes permit coexistence.

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Section: Species Traits and Abundance Patterns In Annual Plant Systemsmentioning

confidence: 88%

Coexistence and Relative Abundance in Annual Plant Assemblages: The Roles of Competition and Colonization

Levine

Rees

2002

The American Naturalist

142

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“…O método de coleta utilizado não registra frutos que são consumidos quando ainda presos à planta (Chapman et al 1994, Greene & Johnson 1994, White 1994. Apenas estas razões, no entanto, não podem ser responsáveis pelo fato de algumas espécies não terem apresentado frutos coletados durante o período.…”

Section: Discussão Mesesunclassified

“…Greene & Johnson (1994) observaram que aproximadamente a metade da produção foi perdida para granívoros e frugívoros antes da queda; a subestimativa é ainda maior durante períodos de menor produção, quando o consumo é maior e, também, naquelas espécies que amadurecem seus frutos aos poucos, tendo desta forma, mais frutos consumidos na própria planta (Chapman et al 1994). Além disto, espécies com sementes de tamanho muito pequeno podem não ter sido incluídas na análise devido a problemas metodológicos, que incluem a malha da peneira coletora e a acuidade visual na triagem.…”

Section: Discussão Mesesunclassified

“…Entre vários métodos para o estudo de eventos fenológicos, diversos autores utilizaram peneiras coletoras para estudos da chuva de sementes (Jackson 1981, Augspurger & Franson 1988, Schupp 1990, Lugo & Frangi 1993, Walker & Neris 1993, Chapman et al 1994, Greene & Johnson 1994, Herrera et al 1994, White 1994) e de aspectos da fenologia (Jackson 1978, Wright & van Schaik 1994 em comunidades vegetais nos trópicos. Entre as vantagens apresentadas para este método está a facilidade de distinção entre botões e flores e entre frutos imaturos e maduros, dificilmente distingüíveis pela simples observação em algumas espécies (Bullock & Sollis-Magalhanes 1990).…”

Section: Introductionunclassified

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Floração e chuva de sementes em mata secundária em São Paulo, SP

Penhalber¹,

Vani²

1997

Rev. bras. Bot.

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-(Flowering and seed rain in a secondary forest in São Paulo, southeastern Brazil). Flowering and seed rain in a secondary forest in São Paulo, southeastern Brazil, were studied through the collection of reproductive material obtained from seed traps of 0.5 x 0.5 m. Collections were made on a monthly basis between January and December, 1993. Ninety species belonging to 37 families were identified in the collected reproductive material. Seasonal flowering and fruiting patterns were observed in the forest. The majority of the species flowered from September; peaks in the flower and fruit abundance were observed in November. The flowering pattern was the same observed in other forests of the region, but the fruiting pattern was more seasonal. From the seed rain, it could be deduced that the anemochorous species dispersed their seeds mainly in November, at the onset of the rainy season and not in the dry season as was expected. The majority of zoochorous species dispersed their seeds during the middle of the rainy season, with a peak in January, when the conditions for fruit ripening, seed dispersal and seedling establishment were optimal. The largest quantity of seeds was produced by the lianas while the group of trees was the richnest in species.RESUMO -(Floração e chuva de sementes em mata secundária em São Paulo, SP). O florescimento e a chuva de sementes foram estudados em trecho de mata secundária em São Paulo, SP, através da coleta de material reprodutivo depositado em peneiras de 0,5 x 0,5 m, recolhido mensalmente entre janeiro e dezembro de 1993. Foram identificadas 90 espécies pertencentes a 37 famílias. Observaram-se padrões sazonais de floração e de frutificação, sendo que a maioria das espécies floresceu a partir de setembro, com picos de floração e de frutificação em novembro. O padrão de floração encontrado foi o mesmo verificado em outras florestas da região, sendo o de frutificação mais sazonal. Na chuva de sementes, as espécies anemocóricas dispersaram propágulos predominantemente em novembro, no início das chuvas e não durante a estação seca, como esperado. A maioria das espécies zoocóricas liberou propágulos durante o meio da estação chuvosa, com pico em janeiro, na época de melhores condições de amadurecimento do fruto, dispersão de sementes e estabelecimento de plântulas. As lianas produziram a maior quantidade de propágulos, enquanto das arbóreas obteve-se o maior número de espécies.

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“…Trees with wide and more highly branched crowns promote greater seed abundance beneath them (McDonnell & Stiles 1983;Holl 1998;Cole et al 2010;Derroire et al 2016) and can serve as attractive environments for seed dispersers and will provide the immediate microclimate for seed germination and seedling growth (Belsky et al 1989;Callaway 2007;Derroire et al 2016). Trees with a larger diameters and hollows in their trunks are important for many bird species (Mazurek & Zielinski 2004), and trees with larger diameters have greater crown coverage and more branches, and will produce more flowers and seeds (Chapman et al 1992;Greene & Johnson 1994).…”

Section: Introductionmentioning

confidence: 99%

Isolated trees with high crown coverage and densities increase pasture seed rain

et al. 2016

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Pasture and crop lands restrict seed dispersal near remnant forest fragments, especially by restricting the movements of dispersal agents and limiting propagule dispersal. Some factors can improve seed dispersal in open areas, such as the presence of high numbers of isolated trees in close proximity to forest fragments. We sought to determine if: (i) the structural characteristics and (ii) densities of isolated trees in pasture lands, and (iii) their distances from the forest fragments, infl uence seed dispersal. We installed 18 seed traps in each of six pastures (total=108 traps) bordering forest fragments distributed over 6 distance classes from the forest edges (0, 5, 10, 20, 40 and 80 m). We determined the characteristics of the plants surrounding the traps. GLM and GLMer analyses were performed and the best model was selected by AIC. We collected 8162 seeds (4722 anemochorous, 3304 epizoochorous, 72 autochorous, and 64 endozoochorous) belonging to 26 species. Our results showed that plants with high crown coverage close to forest fragments and at high densities in the pastures increased seed dispersal. Th ese results may aid future restoration of pasture lands by improving seed dispersal in this harsh habitat and promoting better connectivity between forest fragments.

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Estimating the Mean Annual Seed Production of Trees

Cited by 209 publications

References 16 publications

Coexistence and Relative Abundance in Annual Plant Assemblages: The Roles of Competition and Colonization

Coexistence and Relative Abundance in Annual Plant Assemblages: The Roles of Competition and Colonization

Floração e chuva de sementes em mata secundária em São Paulo, SP

Isolated trees with high crown coverage and densities increase pasture seed rain

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