Diallel analysis of competition between grass species

Norrington-Davies, J.

doi:10.1017/s0021859600014684

Cited by 22 publications

(10 citation statements)

References 7 publications

(7 reference statements)

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“…Further, they are typically derived from experiments that examine pairwise comparisons among species, and that quantify the relative competitive effect (i.e., the ability of a species to suppress other species) and competitive response (i.e., the ability of a species to withstand suppression by other species) (Norrington-Davies 1967;Fowler 1982;Moore and Williams 1983;Mitchley and Grub 1986;Miller and Werner 1987;Goldberg and Landa 1991). However, these hierarchies are rarely developed in field situations that reflect environmental conditions similar to those experienced by intact communities.…”

Section: Introductionmentioning

confidence: 99%

Can community composition be predicted from pairwise species interactions?

Engel

2007

Plant Ecol

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Plant communities are often structured by interactions among species, such as competition or facilitation. If competition is an important factor that controls the presence and absence of species within intact communities, then a competitive hierarchy, a ranked order from competitive dominant to competitive subordinate, should predict the composition of intact communities. We tested whether a competitive hierarchy derived from pairwise comparisons accurately predicts species abundances within a constructed polyculture community consisting of seven species common to old-field plant communities. We first conducted a pot experiment in field conditions wherein we grew the species in all possible combinations, then created a competitive hierarchy derived from both competitive effect and competitive response for each species. Concurrently, at the same site in native field soil, we constructed polycultures consisting of the same seven species and calculated an abundance hierarchy based on foliar cover, biomass, and an index of species performance. The competitive hierarchy was not concordant with the abundance hierarchy, indicating that simple pairwise comparisons may not account for other factors that influence the abundance of species within relatively complex communities.

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Section: Introductionmentioning

confidence: 99%

Can community composition be predicted from pairwise species interactions?

Engel

2007

Plant Ecol

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“…But if we look at the leftmost column, where B is the indicator, we see that while it has up to a point withstood the pressures exerted by C and E, it withstands them less well than it does the pressure exerted by itself in monoculture. We are thus led to infer within this single species, L. perenne, the same distinction between pressure, or aggressiveness, and resistance, or sensitivity, to competition that Breese and Hill (1973) were led to draw when analysing data from duocultures of weeds (Williams, 1962) and grass species (Norrington-Davies, 1968). In our data these two properties are correlated, as we might indeed expect them commonly to be, but the extent and strength of the correlation requires further analysis and discussion.…”

Section: Interpretation: the Competitive Interactionsmentioning

confidence: 59%

Analysis of competitive ability among genotypes of perennial ryegrass

Mather

Hill

Caligari³

1982

Heredity

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The mean yield in grams of dry matter per plant was measured under two cutting regimes, frequent (F) and infrequent (R). The results could not be fitted adequately by linear regression of the mean yield (y) on the number of plants omitted or substituted (x). Curvilinear regression lines of the form y = a + bx2 or y = a + b1x + b2x2 were successful in fitting the data, but they led to unacceptable predictions when they were extended from substitution experiments, where x is negative, to addition experiments in which x is positive. When a square root transformation was used, linear regressions showed an adequate fit with the observations. Furthermore the heterogeneity of the duplicate error variance, found when y itself was employed, was greatly reduced, and the mean square deviations of the observations from the regression lines were homogeneous within the two cutting regimes. The square root transformation also avoids the grossly unacceptable features of polynomial regressions when they are extended to predict the outcome of addition experiments.The regression coefficients were used to derive estimates of the competitive abilities of the three genotypes in both monocultures (intra-genotypic competition) and duocultures (inter-genotype competition). These competitive values differ between the two cutting regimes, being lower under the F regime than under the R.

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“…Also there appeared to be a different relationship between yields and tiller numbers of grasses in monocultures and mixtures (7,10). The present paper reports the results obtained from a box trial in which four varieties of perennial ryegrass were grown in the form of a competition diallel.…”

Section: Introductionmentioning

confidence: 89%

Analyses of Yield From a Competition Trial With Perennial Ryegrass

Thomson

1970

Grass and Forage Science

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Four varieties of perennial ryegrass, (S24, S321, S23 and Endura), were grown in monoculture and in all possible binary mixtures. Three spatial arrangements of varieties within mixtures were used. Total DM yields were recorded from nine harvests during 1969 for mooocultures and mixtures and for the mixture components.The arrangement of varieties within mixtures had no effect on the total DM yield ofthe mixtures. Monocultures and mixtures did not differ significantly in yield at any harvest or in annual total, bnt there were differences between monocultures at some harvests. No differences between mixtures were detected.The experiment took the form of a competition diallel in which monocultures corresponded to the parents in a genetic diallel and mixtures to the crosses hetween these parents. There was a significant interaction hetween the rows (i.e. main variety effects) and the columns (i.e. associated variety effects) of the diallel tahle only at the first harvest. The change in the competitive ahility of the four varieties throughout the season was examined. The relative ranking order of varieties for competitive ability altered as the season progressed.

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Diallel analysis of competition between grass species

Cited by 22 publications

References 7 publications

Can community composition be predicted from pairwise species interactions?

Can community composition be predicted from pairwise species interactions?

Analysis of competitive ability among genotypes of perennial ryegrass

Analyses of Yield From a Competition Trial With Perennial Ryegrass

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