Ecogeography of Annual Legumes in Syria: Distribution Patterns

Ehrman, T. A. M.; Cocks, P. S.

doi:10.2307/2404303

Cited by 68 publications

(38 citation statements)

References 9 publications

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“…Climate was classified by K-means clustering (Engleman & Hartigan 1985) into 12 climatic zones as shown in Figure 1 and Table 1. Further details of sampiing methods and statistical procedures are in Ehrman & Cocks (1990), who conducted the ecogeographic survey.…”

Section: Methodsmentioning

confidence: 99%

“…The climatic classes so mapped (Table 1 and Fig. 1) were taken from a climatic dataset previously analysed using K-means clustering (Ehrman & Cocks 1990). Finally, ecotypic differentiation within species was analysed using pairwise t-tests between population groups within a simplified climatic classification.…”

Section: Methodsmentioning

confidence: 99%

“…Further details of the germplasm, including distributions of the major species in the various regions, are in Ehrman & Cocks (1990). Figure 2 shows the relationships between fecundity (xaxis), seed size (y-axis) and hardseededness (z-axis) found among the 71 species examined.…”

Section: Nature Of Germplasm Collectedmentioning

confidence: 99%

“…This paper uses the ecogeographical survey of Ehrman & Cocks (1990) to find out the ecological and evolutionary significance of combinations of several reproductive traits on the adaptation of legumes to arid areas. In particular, it aims to (1) search for coadaptative relationships among a wide range of reproductive features, (2) assess the impact of increasing aridity on reproductive behaviour, (3) test statistically the conclusions of recent models concerning substitutability of reproductive traits and their response to climate and (4) examine ecotypic differentiation within species in respect to reproductive behaviour with a view to elucidating the evolutionary forces at work along an aridity gradient.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive patterns in annual legume species on an aridity gradient

Ehrman

Cocks

1996

Vegetatio

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Reproductive patterns are analysed in annual legumes of west Asia, and their relationships to increasing aridity determined by multivariate analysis. Dormancy, seed size, dispersal and fecundity are shown to be partially substitutable in terms of their effect on survival and population growth.The range of patterns show greatest diversity under mesic conditions in coastal, mediterranean areas with high winter rainfall, low incidence of frost and long growing season. Increasing aridity leads to increasing reproductive homogeneity, in which a subset of patterns -those composed of high levels of seed dormancy, high seed to pod ratios, restricted dispersal capabilities and early flowering -become predominant. These findings corroborate earlier theoretical and empirical evidence concerning desert annuals.The majority of widespread species are shown to possess "arid-type" patterns. This exerts considerable influence on both the type and degree of ecotypic differentiation within species. The only feature that responds consistently to climatic change is flowering time, particularly among species characterized by high seed dormancy. In the few widespread species that do not display "arid-type" characteristics, ecotypic differentiation appears more frequently in a larger suite of traits.The unequal environmental demands made on species showing different levels of dormancy (e.g. variation in length of growing season from year to year and place to place) leads to strong asymmetries governing the relationships between reproduction and ecological amplitude. In this respect "arid-type" strategists with high seed dormancy appear to have greater chances of expansion than others. This has implications when choosing pasture legumes to improve mediterranean grasslands.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Nature Of Germplasm Collectedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reproductive patterns in annual legume species on an aridity gradient

Ehrman

Cocks

1996

Vegetatio

Self Cite

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“…Flowering time appears to be a common adaptive trait in annual legumes along aridity gradients, provided that they have sufficient seed dormancy (Ehrman and Cocks, 1990). Photoperiod requirements for the induction of flowering may decrease with increasing aridity and rainfall unpredictability (Aronson et al, 1992;Del Pozo et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Phenology, leaf gas exchange, growth and seed yield in Medicago polymorpha L. populations affected by water deficit and subsequent recovery

Yousfi

Saïdi

Slama

et al. 2015

Flora - Morphology, Distribution, Functional Ecology of Plants

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Plant community responses to multiple disturbances in an arid region of northeast Iran

et al. 2019

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Various disturbances affect the vegetation in rural areas. However, the responses of plant communities to multiple disturbances have rarely been studied. We investigated the vegetation of a rural landscape in northeast Iran. We established 42 study sites in three land use types using a stratified‐random design: ungrazed abandoned croplands (UACs), grazed abandoned croplands (GACs), and grazed field margins (GFMs). The species richness and canopy cover for all vascular plants and influential disturbances (i.e., grazing, degraded/nondegraded status, distance to the main road, and distance to active cropland) were recorded at each site. We compared multiple facets of the plant communities among land use types. The results showed that there were significant differences among the species compositions of the land use types, with therophytes dominating in all three. Alien species were found in the three land use types, particularly in UACs. GFMs had the highest number of native species. There were no significant differences in the species or phylogenetic diversities among the land use types. Grazing and distance to active cropland were identified as significant factors determining the native species structure in the area, whereas grazing was the only significant factor determining the alien species structure. There was a significant correlation between the native and alien species structure. Our results imply that grazing disperses native and alien plant propagules simultaneously. Neither grazing nor non‐grazing improved biodiversity in the abandoned croplands. The restoration of this landscape requires a community‐specific plan. GFMs are native plant islands that should be prioritized in restoration.

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Ecogeography of Annual Legumes in Syria: Distribution Patterns

Cited by 68 publications

References 9 publications

Reproductive patterns in annual legume species on an aridity gradient

Reproductive patterns in annual legume species on an aridity gradient

Phenology, leaf gas exchange, growth and seed yield in Medicago polymorpha L. populations affected by water deficit and subsequent recovery

Plant community responses to multiple disturbances in an arid region of northeast Iran

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