Wetland Seed Banks

Leck, Mary Allessio

doi:10.1016/b978-0-12-440405-2.50018-x

Cited by 187 publications

(109 citation statements)

References 14 publications

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“…It might result from a negative influence of depth on the detection of germination stimuli (Pearson et al 2002), to the greater probability of seed concentration near the surface, and/or to a decrease of nutrient concentration with depth (Sassaki et al 1999, B. Medina unpublished data). Bogs were the exception to this trend and, as reported elsewhere for bogs and sandy environments (Leck 1989, Gunster 1994, Bowers 1996, showed no relationship between seedling emergence and seed distance from the soil surface. Indeed, Leck (1989) has argued that water mechanical action can have a fundamental influence in seed localization in the deeper layers, mainly for the smaller ones.…”

Section: Discussionsupporting

confidence: 57%

“…Bogs were the exception to this trend and, as reported elsewhere for bogs and sandy environments (Leck 1989, Gunster 1994, Bowers 1996, showed no relationship between seedling emergence and seed distance from the soil surface. Indeed, Leck (1989) has argued that water mechanical action can have a fundamental influence in seed localization in the deeper layers, mainly for the smaller ones. As a result, soil profiles of flooded habitats tend to show large variation in seed density or germination with depth.…”

Section: Discussionsupporting

confidence: 57%

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The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil

Medina¹,

Fernandes²

2007

Rev. bras. Bot.

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-(The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil). An area's innate potential to regenerate represents a crucial factor for its conservation and management. The seed rain and seed bank are important agents in the regeneration process. Seed banks are particularly important in communities where there is a high proportion of obligate seeders. Rocky outcrops are habitats where most part of the plant species depends on their seeds to reproduce and maintain viable populations. Therefore, seed banks ought to be important in this vegetation physiognomy. We test the hypotheses that the seed bank of the rocky outcrops found in the rupestrian fields of "Serra do Cipó", Brazil, is richer in species and denser than those formed on different vegetation physiognomies neighboring the outcrops. We then compared species abundance, species richness and composition in the rocky outcrops' seed banks with those of sandy and peaty bogs, forests, gallery forests, and "cerrados". Furthermore, we report on the natural regeneration potential of these soils by assessing a greenhouse study on seedling emergence. Soil samples were collected from 0 to 5 and 5 to 10 cm of depth. Rocky outcrops had the poorest in species and less dense seed bank and showed segregation in species composition. Emergence was greater in the most superficial layer. However, soils on rocky outcrops showed the greatest proportion of endemic threatened species in their seed banks, demonstrating their importance for biodiversity conservation of the "Serra do Cipó" rupestrian fields.Key words -natural regeneration, rocky outcrops, seed bank, seedling emergence, "Serra do Cipó" RESUMO -(Potencial regenerativo natural da vegetação rupestre sobre solos de afloramentos rochosos na Serra do Cipó, Brasil). O potencial nato de uma área regenerar após um distúrbio é um fator crucial para sua conservação e manejo. A chuva e o banco de sementes são agentes importantes dessa regeneração. Bancos de sementes são particularmente importantes em comunidades onde a proporção de espécies com reprodução estritamente por sementes é alta. Nesses casos, o banco de sementes é a principal via de regeneração. Afloramentos rochosos são ambientes onde a maior parte das espécies dependem de sementes para reproduzir e manter populações viáveis. Assim, testamos a hipótese de que os afloramentos rochosos da Serra do Cipó teriam solos com bancos de sementes mais ricos e densos do que as outras fisionomias vegetacionais adjacentes. Comparamos então a abundância, riqueza e composição de espécies dos bancos de sementes dos solos dos afloramentos rochosos com os dos brejos arenosos e turfosos, capões de mata, matas de galeria e cerrados. Avaliamos a regeneração natural através da emergência de plântulas. O solo foi coletado entre 0 e 5 cm e entre 5 e 10 cm de profundidade. Os afloramentos rochosos apresentaram os bancos menos densos e mais pobres em espécies, sendo a emergência de plântulas maior nas camadas mais superficiais ...

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Section: Discussionsupporting

confidence: 57%

Section: Discussionsupporting

confidence: 57%

The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil

Medina¹,

Fernandes²

2007

Rev. bras. Bot.

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“…Although more careful analysis of these data is required, correcting for phylogeny, seed size, and other confounding variables, the trend is certainly in the direction predicted by the models. It has also been suggested that similar patterns occur in deserts (Kemp 1989) and wetlands (Leck 1989), although rigorous comparative analyses of these cases have yet to be undertaken.…”

Section: D)mentioning

confidence: 99%

Delayed Germination of Seeds: A Look at the Effects of Adult Longevity, the Timing of Reproduction, and Population Age/Stage Structure

Rees

1994

The American Naturalist

200

150

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Abstr.~lc,t.-The effects of adult longevity, the timing of reproduction. and population ageistage structure on the evolution of seed dormancy are explored in both constant and variable environment modcls. In the constant environment modcls complete germination is the cvolutionarily stable strategy (ESS) regardless of adult longevity. Incorporating a cost of reproduction on subsequent survival does not alter this result. In contrast, in a variable environment changes in adult longevity can exert a strong selection pressure against seed dormancy. Incorporating a cost of reproduction for iteroparous species reduces adult longevity, which selects for more seed dormancy. The magnitude of the change in ESS germination probability depends on several factors, including which life-history stage is variable (e.g., fecundity, seedling survival), whether seeds can detect favorable sites for establishment, and the ageistage structure of the population. In general, increases in adult longevity select against seed dormancy, but exceptions to this pattern are discussed. The idea that established plant traits arc uncoupled from those of the regenerative phase, as assumed by J. P. Grime's competition-stress-rude131 model, is considered critically.

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“…But factors which affects longevity seem to be related to morphology, especially size and thickness of seed tegument, and processes of dispersion are also related to seed morphology (DeVlaming & Proctor, 1968;Moore, 1982). Renewal of the diaspore bank depends on established dynamics of the own diaspore bank as well as on the vegetation, which in turn depends on the form of diaspore bank recruitment, for afterward reproduction, dispersal, predation and viability (Fenner, 1985;Leck, 1989). The seed banks play a critical role in the initial formation and maintenance of the zonation patterns in wetlands, as flooding may influence the seed survivorship in the seed bank (Poiani & Johnson, 1989) and recruitment from the seed bank (Keddy & Ellis, 1985;Seabloom, Valk, & Moloney, 1998).…”

Section: Introductionmentioning

confidence: 99%

<b>Diaspore bank of aquatic macrophytes maintaining species diversity in a Neotropical pond

Ferreira

Catian

Pott

2016

Acta Sci. Biol. Sci.

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ABSTRACT. The diaspore bank is an important component of biological diversity acting mainly as storage and source of diaspores, which also indicate dynamics and patterns of maintenance of plant diversity. We tested the hypothesis that the diaspore bank would be the responsible factor for the maintenance of the aquatic plant species, used two techniques to evaluate the diaspore bank: seedling emergence and direct counting of field samples. Density and richness of the diaspore bank were correlated with plant cover of the aquatic macrophyte communities and also with the euphotic zone radiation in different phases of the hydrological cycle. The diaspore bank is a key factor in maintenance of aquatic macrophyte assemblages in this pond. Nymphaea amazonum was one of the dominant species in the pond and presented temporally peaks of plant cover. Furthermore, depth allowed induction of germination of stored diaspores. Therefore, the diaspore bank may predict which species colonizes a site when environmental characteristics are favorable and allows inferring which processes are linked to changes in structure of aquatic macrophyte assemblages. These mechanisms are the means for recovery of macrophyte species under natural disturbances, represented by water level oscillations in floodplains.Keywords: aquatic plant, plant ecology, seed bank, wetland.Banco de diásporos de macrófitas aquáticas para a manutenção da diversidade das espécies em uma lagoa Neotropical RESUMO. O banco de diásporos é um componente importante da diversidade biológica atuando principalmente como armazenamento e fonte de diásporos, que também indicam a dinâmica e os padrões de manutenção da diversidade vegetal. Testamos a hipótese de que o banco de diásporos seria o fator responsável pela manutenção das espécies de plantas aquáticas, utilizando duas técnicas para avaliar o banco diásporo: emergência das plântulas e contagem direta de amostras de campo. Densidade e riqueza do banco de diásporos foram correlacionadas com cobertura vegetal das comunidades de macrófitas aquáticas e também com a radiação da zona eufótica em diferentes fases do ciclo hidrológico. O banco de diásporos é um fator chave na manutenção das assembleias de macrófitas aquáticas nesta lagoa. Nymphaea amazonum foi uma das espécies dominantes na lagoa temporalmente, apresentou picos de cobertura vegetal. Além disso, a profundidade permitiu a indução da germinação de diásporos armazenados. Portanto, o banco de diásporo é um preditor de quais espécies colonizarão um local quando as características ambientais são favoráveis e permite inferir que os processos estão ligados a mudanças na estrutura das assembleias de macrófitas aquáticas. Estes mecanismos são os meios para a recuperação de espécies de macrófitas sob as perturbações naturais, representados por oscilações do nível de água nas planícies aluviais.Palavras-chave: planta aquática, ecologia vegetal, banco de sementes, pantanal.

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Wetland Seed Banks

Cited by 187 publications

References 14 publications

The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil

The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil

Delayed Germination of Seeds: A Look at the Effects of Adult Longevity, the Timing of Reproduction, and Population Age/Stage Structure

<b>Diaspore bank of aquatic macrophytes maintaining species diversity in a Neotropical pond

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