Effects of resource availability on integration and clonal growth inMaianthemum bifolium

D’Hertefeldt, Tina; Jónsdóttir, Ingibjörg S.

doi:10.1007/bf02803793

Cited by 29 publications

(23 citation statements)

References 16 publications

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“…Rhizomes, which store carbon and nitrogen (LaFrankie 1986;Nordin and Näsholm 1997), had the smallest specific masses where light was most limiting. This is consistent with the observation that defoliation can reduce rhizome specific mass in M. bifolium (D'Hertefeldt and Jónsdóttir 1994). Although reserves should be exploited when overstory conditions limit carbon gain (Chapin et al 1990;Dong and de Kroon 1994;Hutchings 1997), as demonstrated for clonal shrubs in closed-canopy, coniferous forests (Messier et al 1989;Tappeiner et al 1991;Huffman et al 1994), Maianthemum may compensate for reduced storage in horizontal rhizomes by increased storage in short shoots.…”

Section: Plasticity In Biomass Allocationsupporting

confidence: 89%

“…Old, leafless, belowground ramets with dormant buds and viable roots contribute to resource uptake in some forest herbs D'Hertefeldt and Jónsdóttir 1994;Jónsdóttir and Watson 1997). However, their function in Maianthemum is uncertain: they may represent a protracted or delayed process of bud development, an early stage of short-shoot senescence, or a type of "recovery" ramet, one that develops preformed shoots late in the growing season in response to damage of nearby rhizomes or apical buds (sensu Jónsdóttir and Watson 1997).…”

Section: Age Structure and Demographymentioning

confidence: 99%

“…However, increased fragmentation of rhizomes is also likely and may reflect a decline in the physiological function of rhizome connections among ramets. Carbon-14 labeling experiments with the related M. bifolium showed less extensive integration among ramets in a nutrient-and light-limited forest than in a resource-rich forest (D'Hertefeldt and Jónsdóttir 1994). Maintenance and production of structural connections require resources (Carlsson et al 1990;Stuefer et al 1996;Jónsdóttir and Watson 1997) and may be of limited value where resources are uniformly low.…”

Section: Above-and Below-ground Morphologymentioning

confidence: 99%

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

Lezberg¹,

Halpern²,

Antos³

2001

Can. J. Bot.

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Abstract:The development of a dense tree layer in young coniferous stands can suppress understory plants, leading to very low herb abundance and diversity. In this study, clonal development of the rhizomatous herb Maianthemum dilatatum (Wood) Nels & Macbr. was compared among four types of coniferous forest (young, closed canopy; young, silviculturally thinned; mature; and old growth) on the western Olympic Peninsula, Washington. We predicted that (i) ramet turnover would be lowest, (ii) clonal fragment size would be smallest, and (iii) allocation of resources to leaves would be greatest in young, closed-canopy forests, and that these traits would increase (or decrease for leaves) as understory conditions became more favorable with stand development or thinning. The low frequency of new ramets in young, closed-canopy stands supported the first prediction. The second prediction was also supported: lateral spread and rhizome mass were smallest in these stands. However, allocation to leaves was not higher in dense young stands, indicating that Maianthemum does not respond to stress by increased investment in leaves. Clonal fragments in thinned, mature, and old stands showed no differences in traits, suggesting that once tree canopies rise, canopy gaps form, or young stands are thinned, resource levels are favorable for clonal growth. Maianthemum appears to persist in dense, young stands by maintaining long-lived ramets that produce leaves annually, rather than by increasing rhizome spread, rhizome storage, or allocation to leaves.Key words: age structure, biomass allocation, canopy closure, forest herb, rhizome.Résumé : Le développement d'une dense canopée dans les jeunes peuplements de conifères peut supprimer la végéta-tion de sous-bois et conduire à de très faibles abondances et diversités de petites plantes herbacées. Dans cette étude, les auteurs comparent le développement clonal d'une plante herbacée, le Maienthemum dilatatum (Wood) Nels & Macbr., dans quatre types de forêts conifériennes (jeune à canopée fermée, jeune éclaircie par sylviculture, mature, surannée), situés dans la péninsule Olympique occidentale de l'état de Washington. Les auteurs ont prédit que (i) le cyclage des ramettes serait le plus faible, (ii) la dimension des rameaux clonaux serait la plus faible, et (iii) l'allocation aux feuilles serait la plus élevée dans les jeunes forêts à canopée fermée, et que ces caractéristiques augmenteraient (ou diminueraient) à mesure que les conditions de sous-bois deviendraient plus favorables avec le développement ou l'éclairci du peuplement. La faible fréquence des nouvelles ramettes dans les peuplements jeunes à canopée fermée supportent la première prédiction. La seconde prédiction s'avère également juste : le développement latéral et la masse de rhizome sont plus faibles dans ces peuplements. Cependant, l'allocation aux feuilles n'est pas plus forte dans les jeunes peuplements denses, ce qui indique que le Maienthemum ne réagit pas à l'ombrage par un investissement accru dans les feuilles. Les fragme...

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Section: Plasticity In Biomass Allocationsupporting

confidence: 89%

Section: Age Structure and Demographymentioning

confidence: 99%

Section: Above-and Below-ground Morphologymentioning

confidence: 99%

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

Lezberg¹,

Halpern²,

Antos³

2001

Can. J. Bot.

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“…Ong and Marshall 1979;Salzman and Parker 1985;Alpert and Mooney 1986;Slade and Hutchings 1987;Stuefer et al , 1996Wijesinghe and Handel 1994;D'Hertefeldt and van der Putten 1998;Yu et al 2002). Previous studies on forest herbs have demonstrated that physiological integration is beneficial in forest environments where light conditions are heterogeneous and light availability relatively low (de Kroon et al 1991;D'Hertefeldt and Jónsdóttir 1994;Hutchings and Wijesinghe 1997). However, under homogeneous resource conditions the benefits of sharing are suggested to decrease or to be turned into a cost (Pitelka and Ashmun 1985;Caracao and Kelly 1991;Alpert 1999).…”

Section: Introductionmentioning

confidence: 93%

Origin matters for level of resource sharing in the clonal herb Aegopodium podagraria

Nilsson

D’Hertefeldt

2007

Evol Ecol

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Resource sharing in heterogeneous environments has been shown to increase growth and survival of clonal plants. In addition, plants in harsh climates have been suggested to have higher levels of resource sharing than plants in milder climates. We experimentally investigated the level of resource sharing in plants from garden and forest habitats from two regions with contrasting climates. The clonal herb Aegopodium podagraria reaches its northern distribution limit in central Sweden. South of that it grows in both patchy and dynamic light climate, as a natural component of deciduous forest, as well as in more homogeneous light climates as a garden weed. Since heterogeneity and habitat harshness have both been suggested to increase resource sharing, we hypothesized (1) integration and sharing of resources to be higher in plants from forest than in plants from garden habitats and (2) integration and sharing of resources to be higher in plants from the northern region that encounter a harsher climate than in plants from the southern region. Clonal fragments of A. podagraria were collected and multiplied in the greenhouse. Ramet pairs were then planted in adjacent pots, with one ramet shaded. Rhizome connection was either left intact or severed to prevent resources sharing. Plants from forest habitats were more negatively affected by the severance treatment than plants from garden habitats. Although region alone had no significant effect on biomass, the interaction between rhizome severing, shading and regional origin was close to significance. We conclude that A. podagraria from forests are more dependent on resource sharing than those from gardens. These results concur with previous studies that suggest that local adaptation for different degrees of resource sharing can occur in clonal plants.

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“…Plant foraging theory and empirical studies suggest that clonal herbs should develop more compact, highly branched rhizome systems in environments with greater resource availability (Slade and Hutchings 1987, de Kroon and Schieving 1991, D'Hertefeldt and Jónsdóttir 1994 and more diffuse, less branched rhizome systems where resources are more limiting or more heterogeneous in space. Interestingly for Maianthemum, branching of rhizome systems and densities of dead and total rhizome tips were lower in CWD where resource availability, in this case moisture, was greater.…”

Section: Substrate Effects On Understory Plant Performancementioning

confidence: 99%

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

Six

Halpern

2008

Botany

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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.

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Effects of resource availability on integration and clonal growth inMaianthemum bifolium

Cited by 29 publications

References 16 publications

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

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

Origin matters for level of resource sharing in the clonal herb Aegopodium podagraria

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

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