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Long-Term Population Demography of Trillium Recurvatum on Loess Bluffs in Western Tennessee, USA

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Long-Term Population Demography of Trillium Recurvatum on Loess Bluffs in Western Tennessee, USA AoB PLANTS http://aobplants.oxfordjournals.org/ Open access – Research article Long-term population demography of Trillium recurvatum on loess bluffs in western Tennessee, USA James E. Moore1,2*, Scott B. Franklin2,3, Gary Wein2,4 and Beverly S. Collins2,5 1 Department of Biology, Christian Brothers University, Memphis, TN 38104, USA 2 Edward J. Meeman Biological Field Station, The University of Memphis, Millington, TN 38058, USA 3 School of Biological Sciences, The University of Northern Colorado, Greeley, CO 80639, USA 4 Highlands-Cashiers Land Trust, Highlands, NC 28723, USA 5 Department of Biology, Western Carolina University, Cullowhee, NC 28723, USA Downloaded from Received: 8 February 2012; Returned for revision: 26 March 2012; Accepted: 14 April 2012; Published: 18 April 2012 Citation details: Moore JE, Franklin SB, Wein G, Collins BS. 2012. Long-term population demography of Trillium recurvatum on loess bluffs in western Tennessee, USA. AoB PLANTS 2012: pls015; doi:10.1093/aobpla/pls015 Abstract http://aobpla.oxfordjournals.org/ Background Understanding the demography of long-lived clonal herbs, with their extreme modularity, and aims 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, Tril- lium recurvatum, by examining temporal and small-scale demographic patterns. We hypothe- sized: (i) there would be more variability in the juvenile age class compared with non- flowering adult and flowering adult classes due to year-to-year fluctuations in recruitment; (ii) rates of population growth (l) and increase (r) would be highest in non-flowering ramets due to a combination of transitions from the juvenile stage and reversions from flowering at Christian Brothers University on May 21, 2012 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 (l) 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. Introduction environments (Billings and Mooney 1968). Their Clonal plants make up 40 % of our planet’s flora extreme modularity allows these plants to forage more (Tiffney and Niklas 1985) and dominate many harsh broadly, integrate larger plant bodies and forgo sexual * Corresponding author’s e-mail address: [email protected] Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/uk) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. AoB PLANTS 2012: pls015; doi:10.1093/aobpla/pls015, available online at www.aobplants.oxfordjournals.org & The Authors 2012 1 Moore et al. — Long-term demography of Trillium recurvatum reproduction. Understanding the demography of long- growth on Trillium demography and demographic lived clonal herbs requires knowledge of both their structure. short- and long-term survival and ramet growth The objectives of our research were to monitor a popu- responses. Over the short term, population size and lation of a clonal Trillium species (T. recurvatum Beck) age structure can vary due to year-to-year differences over time and examine temporal population dynamics. in numbers of flowering plants and ramet growth We hypothesized that the number of ramets in each rates. Over the long term, population growth rates may age class would differ significantly from year to year be density dependent (Tomimatsu and Ohara 2010), (probably the result of no seedling recruitment). We vary spatially in response to factors such as forest frag- examined dynamics of each age class (juveniles, non- mentation (Jules 1998) or vary greatly in response to flowering adults and flowering adults) separately. We abiotic factors, e.g. precipitation (Klimesˇova´ and Klimesˇ hypothesized that this population would have greater 2008). variability in the juvenile age class due to year-to-year Among clonal forest understorey herbs, such as Tril- fluctuations in recruitment, and the rate of population Downloaded from lium species, demography and population demographic increase (r) and population growth rates would be structure reflect the pools and rates of transition from highest in non-flowering ramets due to a combination young (juvenile) through adult non-flowering to flower- of transitions from the juvenile stage and reversions ing life history stages. These life history transitions can from flowering adults. We also examined the potential be affected by biotic factors such as deer herbivory, effects of prior- and current-season temperature and http://aobpla.oxfordjournals.org/ which can decrease relative leaf area and the transition precipitation on ramet production and demographic from non-flowering to flowering plants, cause ramets to transitions. Finally, we expected the spatial co-pattern regress in stage and have lower fecundity, and increase to be greater for flowering vs. non-flowering and non- the probability of non-emergence (i.e. decrease new flowering vs. juvenile age classes, when compared with ramet production) (Knight 2004; Leege et al. 2010). Dis- flowering vs. juvenile ramets due to seed dispersal tance to edge, fragmentation or disturbance can also (away from the parent) by ants. affect recruitment and demography of Trillium species, and there is some evidence for density-dependent at Christian Brothers University on May 21, 2012 growth rates (Tomimatsu and Ohara 2010). For Materials and methods example, Trillium ovatum plants within 65 m of the Trillium recurvatum Beck is a clonal perennial under- edge in small remnants of uncut forest showed lower re- storey herb that reaches the northern limits of its cruitment than plants in interior populations (Jules range in southern Michigan and Wisconsin; it ranges 1998). However, non-clonal Trillium camschatcense west to eastern Iowa and Missouri, east to Pennsylvania, across a range of forest fragment sizes showed wide and south through the heart of its range in Indiana and variation in fecundity; population growth rates (l)were Illinois, extending into northern Louisiana and Alabama affected both by density and year-to-year climate vari- (O’Connor 2007). In Tennessee, T. recurvatum occurs ation (Ohara 1989; Ohara et al. 2006). from the Cumberland Plateau region westward. Plants Variation in transitions between life history stages, emerge in late January and February, flower in April– seed production, recruitment and clonal growth creates June and senesce in late July–September (Strausbaugh wide variation in short- and long-term population and Core 1978). When reproduction from seed occurs, age structure among clonal forest understorey herb T. recurvatum has double dormancy; ants collect the species. In a short-term (2-year) study of Trillium macu- seeds and feed upon the elaiosomes, discarding the latum population demographic and spatial genetic struc- seeds in tunnels until germination occurs (Case and ture, Walker et al. (2009) found that the number of Case 1997). Breeding system studies suggest that seedlings and the proportion of one-leaf (juvenile) T. recurvatum is strongly outcrossing (Sawyer 2010). It plants differed between years, but the proportions of is considered rare in Alabama, Iowa, Louisiana, North three-leaf non-flowering and flowering plants remained Carolina, Ohio, Texas and Wisconsin (NatureServe 2006). the same. Over the longer term, marked individuals of This research is part of an ongoing, long-term analysis Trillium apetalon (a non-clonal species) were followed of T. recurvatum population demographics at Meeman over 12 years. At steady state, frequencies of three- Biological Field Station (MBFS), which is owned and oper- leaved and flowering plants were low, but consistent ated by the University of Memphis, Memphis, TN, USA. flowering over years yielded relatively high frequencies Meeman Biological Field Station is a 252-ha site of seedlings (Ohara et al. 2001). As a result of this vari- 40 km north of Memphis, TN, and 3 km east of the Mis- ation, both short- and long-term studies of marked indi- sissippi River on a Chickasaw Bluff. Meeman Biological viduals may be needed to elucidate the effects of clonal Field Station is found in the narrow transition zone 2 AoB PLANTS 2012: pls015; doi:10.1093/aobpla/pls015,
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