Genetic Consequences of Tropical Second-Growth Forest Regeneration

Sezen, U. Uzay; Chazdon, Robin L.; Holsinger, Kent E.

doi:10.1126/science.1105034

Cited by 92 publications

(117 citation statements)

References 5 publications

(6 reference statements)

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“…Despite the large amount of gene flow from outside, a few among the 23 adults produced a disproportionate part of the natural regeneration, especially considering the large number of spruces living below treeline and the well-known recruitment limitations at treeline (Stevens and Fox, 1991;Oleksyn et al, 1998). Similar uneven reproductive success has been reported in many studies based on parentage analysis on herbaceous and tree species (Meagher and Thompson, 1987;Dow and Ashley, 1996;Aldrich and Hamrick, 1998;Schnabel et al, 1998;Sezen et al, 2005). We found that reproductive success is not related to tree size, and that tree size is weakly related with age.…”

Section: Discussionsupporting

confidence: 69%

Spruce colonization at treeline: where do those seeds come from?

et al. 2009

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At treeline, selection by harsh environmental conditions sets an upward limit to arboreal vegetation. Increasing temperatures and the decline of traditional animal raising have favoured an upward shift of treeline in the last decades. These circumstances create a unique opportunity to study the balance of the main forces (selection and gene flow) that drive tree migration. We conducted a parentage analysis sampling and genotyping with five microsatellite markers in all Norway spruce individuals (342 juveniles and 23 adults) found in a recently colonized treeline area (Paneveggio forest, Eastern Alps, Italy). Our goal was to evaluate local reproductive success versus gene flow from the outside. We were able to identify both parents among local adults for only 11.1% of the juveniles. In the gamete pool we sampled, two-thirds were not produced locally. Effective seed dispersal distance distribution was characterized by a peak far from the seed source (mean 344.66 m ± 191.02 s.d.). Reproductive success was skewed, with six local adults that generated almost two-thirds (62.4%) of juveniles with local parents. Our findings indicate that, although a few local adults seem to play an important role in the colonization process at treeline, large levels of gene flow from outside were maintained, suggesting that the potential advantages of local adults (such as local adaptation, proximity to the colonization area, phenological synchrony) did not prevent a large gamete immigration.

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Section: Discussionsupporting

confidence: 69%

Spruce colonization at treeline: where do those seeds come from?

et al. 2009

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“…the harvester's preference for individuals with greater diameter at breast height results in the removal of only a part of a population's diversity, and the rest remains in the earlier stages (seedlings and juveniles). in fact, Santos (2004) demonstrated a slight but significantly higher polymorphism in seedlings of Rosewood in comparison to the adult stage in the adolpho Ducke Forest Reserve (manaus population), supporting such a hypothesis (but see Sezen et al, 2005). moreover, high outcrossing rates (expected in Rosewood) and large effective population sizes have been invoked as factors that would maintain the genetic diversity and structure of the population even under silvicultural management (Robledoanuncio et al, 2004).…”

Section: Distribution Of the Genetic Diversity In Rosewood Populationsmentioning

confidence: 72%

Geographic pattern of genetic diversity in natural populations of Rosewood (Aniba rosaeodora), in the Central Amazonia

et al. 2008

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Rosewood (Aniba rosaeodora Ducke, lauraceae) is an amazonian evergreen tree and a source of the purest linalool, the main component of its essential oil, which is very valuable in the international perfumery market. after decades of over-exploitation it is currently considered as threatened. We evaluated the genetic diversity and its distribution in four populations in Central amazonia. thirty-five reliable RaPD markers were generated, of which 32 were polymorphic (91.4%). variation was higher within the populations (76.5%; p < 0.0001) and geographic distribution contributed to population differentiation (23.4%; p < 0.0001). the amazon River had a small influence on gene flow (3.3%; p < 0.0001), but we identified evidence of gene flow across the river. there were significant differences in marker frequencies (p < 0.05), in agreement with the low gene flow (Nm = 2.02). the correlation between genetic distance and gene flow was -0.95 (p = 0.06) and between geographic distance and gene flow was -0.78 (p = 0.12). there was a geographic cline of variability across an east-West axis, influenced as well by the amazon River, suggesting the river could be a barrier to gene flow. although threatened, these Rosewood populations retain high diversity, with the highest levels in the manaus population, which has been protected for over 42 years in a Reserve.Keywords: RaPD, linalool, gene flow, amazon Rainforest.Padrão geográfico de diversidade genética em populações naturais de Pau-rosa (Aniba rosaeodora), na Amazônia Central resumo o Pau-rosa (Aniba rosaeodora Ducke, lauraceae) é uma árvore amazônica fonte do mais puro linalol, o qual é o principal componente do seu óleo essencial e muito valioso no mercado internacional de perfumaria. após várias décadas de intensa exploração, a espécie foi levada à categoria de ameaçada de extinção. Quatro populações naturais distribuídas na bacia amazônia Central foram avaliadas quanto ao nível e a distribuição da diversidade genética. trinta e cinco marcadores RaPD reprodutíveis foram gerados, dos quais 32 foram polimórficos (91,4%). a diversidade foi maior dentro das populações (76,5%; p < 0,0001) e a distribuição geográfica contribuiu para a diferenciação entre as populações (23,4%; p < 0,0001). a amova indicou que pode haver uma influência parcial do Rio amazonas no fluxo gênico (3,3%; p < 0,0001), mas foram identificadas evidências de fluxo gênico atravessando o rio. Houve diferenças significativas nas freqüências dos marcadores (p < 0,05) e o fluxo gênico estimado foi relativamente baixo (Nm = 2,02). a correlação entre a distância genética e o fluxo gênico foi de -0,95 (p = 0,06) e para a distância geográfica e o fluxo gênico foi de -0,78 (p = 0,12). Houve um padrão geográfico de variabilidade ao longo do eixo leste -oeste, influenciado também pelo Rio amazonas, o que sugere que o rio poderia funcionar como uma barreira para o fluxo gênico. apesar de ameaçadas, estas populações de Pau-rosa possuem alta diversidade, com o maior valor na população de manaus, que vem sendo prot...

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“…First, gene flow may swamp local selective pressures. Seed dispersers often range widely (Holbrook & Smith 2000) and dispersal distances can reach nearly 1km in this region (Sezen et al 2005). This fact suggests that populations of plants with ranges spanning several hundred meters of elevation may exchange genes regularly, precluding adaptation to the local biotic environment.…”

Section: Discussionmentioning

confidence: 99%

Phenology of tropical understory trees: patterns and correlates

Boyle¹,

Bronstein

2012

RBT

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Reproductive phenologies of plants are constrained by climate in highly seasonal regions. In contrast, plants growing in wet tropical forests are freed from many abiotic constraints, which in canopy tree communities lead to a rich diversity of phenological patterns within and among individuals, species and communities. However, basic descriptions of tropical phenological patterns and the processes that shape them are rare. Here, we document the individual-, population-, and landscape-level phenological patterns of two dominant families of understory woody plants important to avian frugivores, the Melastomataceae and Rubiaceae, along an elevational transect in Costa Rica. The 226 individual plants belonging to 35 species in this study, varied in the number of reproductive bouts/year, and the timing, duration, and synchrony of reproductive stages. This variation was not related to factors related to their interactions with mutualists and antagonists, nor did it appear to be constrained by phylogeny. Diverse phenological patterns among species led to relatively aseasonal patterns at the community and landscape level. Overall, evidence for biotic processes shaping temporal patterns of fruiting phenology was weak or absent. These findings reveal a number of unexplained patterns, and suggest that factors shaping phenology in relatively aseasonal forests operate in idiosyncratic ways at the species level. Rev. Biol. Trop. 60 (4): 1415-1430. Epub 2012 December 01.

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Genetic Consequences of Tropical Second-Growth Forest Regeneration

Abstract: Follow this and additional works at: http://digitalcommons.uconn.edu/eeb_articles Recommended Citation Sezen, Uzay U.; Chazdon, Robin L.; and Holsinger, Kent E., "Genetic consequences of tropical second-growth forest regeneration" (2005). EEB Articles. 2.

Cited by 92 publications

References 5 publications

Spruce colonization at treeline: where do those seeds come from?

Spruce colonization at treeline: where do those seeds come from?

Geographic pattern of genetic diversity in natural populations of Rosewood (Aniba rosaeodora), in the Central Amazonia

Phenology of tropical understory trees: patterns and correlates

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