e-journal

Long-term population demography of Trillium recurvatum on loess bluffs in western Tennessee, USA

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Abstract.
Background and aims:
Understanding the demography of long-lived clonal herbs, with their extreme modularity,
requires knowledge of both their short- and long-term survival and ramet growth patterns.
The primary objective of this study was to understand the dynamics of a clonal forest herb, Trillium
recurvatum, by examining temporal and small-scale demographic patterns. We hypothesized:
(i) there would be more variability in the juvenile age class compared with nonflowering
adult and flowering adult classes due to year-to-year fluctuations in recruitment;
(ii) rates of population growth (λ) and increase (r) would be highest in non-flowering ramets
due to a combination of transitions from the juvenile stage and reversions from flowering
adults; and (iii) inter-ramet distances would be most variable between flowering and juvenile
ramets due to a combination of clonal growth, seed dispersal byants and ramet death over time.

Methodology:
Census data were collected on the total number of stems in the population from 1990 to
2007, and placed within one of three life stages (juvenile, three-leaf non-flowering and
three-leaf flowering). Modified population viability equations were used to assess temporal
population viability, and spatial structure was assessed using block krigging. Correlations
were performed using current and prior season weather to current population demography.

Principal results:
The first hypothesis was rejected. The second hypothesis was supported: population increase
(r) and growth rate (λ) were highest in non-flowering ramets. Finally, the third hypothesis was
rejected: there was no apparent density dependence within this population of Trillium and no
apparent spatial structure among life stages.

Conclusions:
Overall population density fluctuated over time, possibly due to storms that move soil, and
prior year’s temperature and precipitation. However, density remained at some dynamic
stable level. The juvenile age class had greater variability for the duration of this study and
population growth rate was greatest for non-flowering ramets.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press., 2012

Deskripsi Fisik

AoB PLANTS 2012: pls015; doi:10.1093/aobpla/pls015

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2012: pls015

Subjek

EKOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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