Clonal development of <i>Maianthemum dilatatum</i> in forests of differing age and structure

Lezberg, Ann L.; Halpern, Charles B.; Antos, Joseph A.

doi:10.1139/b01-083

Cited by 18 publications

(31 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ramets consist of a rhizome segment initiated at the base of a parent shoot and a below-ground short shoot that gives rise to a vegetative (leafy) or sexual shoot (leafy with a terminal inflorescence). Lezberg et al (2001) provide a detailed description of its growth form and clonal architecture.…”

Section: Comparative Analyses Of Substrate Effects On Plant Performancementioning

confidence: 99%

“…I recorded the number of rhizome tips that were live (white and growing) and dead (brown and often fragmented) and expressed these relative to total rhizome length (i.e., density of live and dead tips; Fig. 2; see also Lezberg et al 2001); density of total tips was then calculated by summation. Total rhizome length was calculated as the sum of the lengths of all rhizome segments.…”

Section: Vaccinium Parvifolium Smith Occurs West Of the Sierra Nevadamentioning

confidence: 99%

“…By establishing on logs, short-statured species may avoid competition with taller, more vigorous plants. Thus, the ability to germinate and persist on logs may be advantageous in the forest understory where light is often limiting (Tappeiner and Alaback 1989, Lieffers et al 1999, Lezberg et al 2001. Other resources may also be more available in CWD than on the forest floor.…”

Section: Introductionmentioning

confidence: 99%

“…Low resource availability can limit growth and biomass accumulation in clonal forest herbs (Tappeiner and Alaback 1989, Huffman and Tappeiner 1997, Lezberg et al 2001). However, plants may also respond to resource limitation by changing allocation to above-or below-ground structures (Reynolds and Thornley 1982, Chapin et al 1993, Paz 2003, Trubat et al 2006.…”

mentioning

confidence: 99%

“…This should be particularly apparent in clonal herbs that are able to vary the density or spacing of ramets by adjusting the length or degree of branching of rhizome segments or stolons (Bell 1984 branching, instead maintaining long-lived ramets in place through annual releafing (Ashmun and Pitelka 1984, Huffman et al 1994, Lezberg et al 2001.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Substrate effects on distribution, biomass allocation, and morphology of forest understory plants

Six

Halpern

2008

Botany

View full text Add to dashboard Cite

This is to certify that I have examined this copy of a master's thesis by Laura J. Six and have found that it is complete and satisfactory in all respects, and that any and all revisions required by the final examining committee have been made. substrate affinities, I also tested whether rooting substrate affected allocation to aboveand below-ground structures, morphological traits, or overall performance (total biomass and plant nitrogen), consistent with differences in moisture availability between substrates.I tested whether understory species showed significant associations with CWD or the forest floor using 1200, 1 x 1 m quadrats in which I compared cover of CWD and forest floor (as measures of substrate availability) and the density of shoots of each species emerging from each substrate. To examine relationships between rooting substrate and plant performance, I excavated three common understory species: Tiarella trifoliata (preference for forest floor), Vaccinium parvifolium (preference for CWD), andMaianthemum dilatatum (no preference for either substrate). For each species, the below-ground structures (rhizomes and roots) and aerial shoots (stems and leaves) of 30 pairs of plants (one rooted in CWD, one in the forest floor) were measured, then dried to determine mass. Replicate samples of each substrate were collected every 3 wk (June through mid-September) to test for differences in volumetric moisture.Most species (83%) displayed a preference for substrate; of these, 75% preferred the forest floor. Species preferences for CWD or forest floor did not appear to be related to plant stature or any other morphological or life-history trait. Most species may be associated with the forest floor because it is a more predictable and stable substrate.Alternatively, preference for the forest floor may relate to competition with mosses: moss cover was more than twice as high on CWD as on the forest floor (87 vs. 38%). Patterns of biomass allocation in Maianthemum, Tiarella, and Vaccinium were consistent with differences in moisture availability between substrates: plants rooted in the forest floor (which was consistently drier over the growing season) allocated greater biomass to below-ground structures. However, effects of substrate on above-ground traits (e.g., leaf density, leaf area, and shoot height) were non-significant, and effects on below-ground traits were largely inconsistent with differences in moisture availability between substrates.Depth and lateral spread of rhizome systems may be determined by the physical structure of decaying logs rather than by resource availability. In addition, light may be so limiting in these forests that it masks the potential for species to respond to substraterelated differences in resource availability. Finally, it is possible that associations with substrates are driven not by differences in performance of established plants, but by differences in dispersal, germination, and/or early survival.

show abstract

Section: Comparative Analyses Of Substrate Effects On Plant Performancementioning

confidence: 99%

Section: Vaccinium Parvifolium Smith Occurs West Of the Sierra Nevadamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Substrate effects on distribution, biomass allocation, and morphology of forest understory plants

Six

Halpern

2008

Botany

View full text Add to dashboard Cite

show abstract

Plant community succession following ungulate exclusion in a temperate rainforest

2021

View full text Add to dashboard Cite

Ecosystem structure and processes of coastal temperate rainforests of the Pacific Northwest are thought to be strongly influenced by herbivory primarily of Roosevelt elk (Cervus elaphus roosevelti) and secondarily of Columbian black‐tailed deer (Odocoileus hemionus columbianus). Two large (0.5‐ha) exclosures were built in old‐growth coniferous rainforest communities in Olympic National Park, Washington, during 1979 to study these effects. Cover of shrubs, ferns, herbs, and graminoids and numbers of tree seedlings were described over 36 yr. Results show a sequence following ungulate exclusion of early release of shrubs, ferns, and herbs followed by eventual dominance of shrubs as other vegetation layers become shaded. Short‐term responses of individual species reflected functional traits related to ability to avoid or tolerate herbivory. Over the longer term, effects reflected changing competitive relationships among vegetation layers and other ecosystem dynamics such as the provision of fallen trees in the appropriate decay class to serve as establishment substrate for tree seedlings. In aggregate, vegetation composition shifted after 36 yr from a system dominated by herbaceous cover with a major graminoid component to one dominated by shrubs (5‐ to 6‐fold absolute increase) and ferns (5–7% increase in absolute cover), less absolute herb cover (15–20% loss), and almost no graminoids (<1.5% cover remaining in any plot) after 36 yr. These changes represented a substantial loss in plant community diversity with a loss of 46 of 74 species. Elk abundance outside of the exclosures began to decline in the 1990s leading to parallel changes in plant community trajectories outside of exclosures to those initially seen inside. While this suggests plant community responses inside the exclosures were also driven by elk exclusion, the strength of this response depends on elk abundance.

show abstract

Sexual reproduction, clonal diversity and genetic differentiation in patchily distributed populations of the temperate forest herb Paris quadrifolia (Trilliaceae)

et al. 2005

View full text Add to dashboard Cite

Clonal plant species have been shown to adopt different strategies to persist in heterogeneous environments by changing relative investments in sexual reproduction and clonal propagation. As a result, clonal diversity and genetic variation may be different along environmental gradients. We examined the regional and local population structure of the clonal rhizomatous forest herb Paris quadrifolia in a complex of forest fragments in Voeren (Belgium). Relationships between population size (the number of shoots), shoot density (the number of shoots per m2) and local growth conditions were investigated for 47 populations. Clonal diversity and genetic variation within and among 19 populations were investigated using amplified fragment length polymorphism markers. To assess the importance of sexual reproduction, seed set, seed weight and germination success were determined in 18 populations. As predicted, local growth conditions largely affected population distribution, size and density of P. quadrifolia. Populations occurring in moist and relatively productive sites contained significantly more shoots. Here, shoots were also much more sparsely distributed compared to populations occurring in dry and relatively unproductive sites, where shoots showed a strongly aggregated distribution pattern. Clonal diversity was relatively high, compared with other clonal species (G/N ratio=0.43 and Simpson's D=0.81). Clonal diversity significantly (P<0.01) decreased with increasing shoot density while molecular genetic variation was significantly (P<0.01) affected by population size and local environmental conditions. Lack of recruitment and out-competition of less-adapted genotypes may explain the decreased genetic variation in dry sites. Analysis of molecular variance revealed significant genetic variation among populations (PhiST=0.42, P<0.001), whereas pairwise genetic distances were not correlated to geographic distances, suggesting that gene flow among populations is limited. Finally, the number of generative shoots, the number of seeds per fruit and seed weight were significantly and positively related to population size and local growth conditions. We conclude that under stressful conditions populations of clonal forest plant species can slowly evolve into remnant populations characterized by low levels of genetic variation and limited sexual reproduction. Conservation of suitable habitat conditions is therefore a prerequisite for effective long-term conservation of clonal forest plant species.

show abstract

Clonal development of Maianthemum dilatatum in forests of differing age and structure

Cited by 18 publications

References 56 publications

Substrate effects on distribution, biomass allocation, and morphology of forest understory plants

Substrate effects on distribution, biomass allocation, and morphology of forest understory plants

Plant community succession following ungulate exclusion in a temperate rainforest

Sexual reproduction, clonal diversity and genetic differentiation in patchily distributed populations of the temperate forest herb Paris quadrifolia (Trilliaceae)

Contact Info

Product

Resources

About