Reproductive patterns in annual legume species on an aridity gradient

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

doi:10.1007/bf00052815

Cited by 83 publications

(51 citation statements)

References 49 publications

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“…This result suggests that H. carnosum would maintain a more resistant seed bank than the other 2 Hedysarum species. This result is not unexpected as H. carnosum originates from arid environments where plants tend to possess harder-seeded characteristics more suited to variable environments (Ehrman and Cocks 1996).…”

Section: Softened Seedmentioning

confidence: 74%

First year seed softening in three Hedysarum spp. in southern Queensland

Bell¹,

Lloyd²,

Bell³

et al. 2003

Aust. J. Exp. Agric.

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Abstract. Seed softening was investigated in 41 lines of Hedysarum coronarium, 5 lines of H. carnosum and 8 lines of H. flexuosum grown at Oakey, Queensland in 2000. After testing for initial hard seed content in each line, the remaining hard seeds were placed on the soil surface at Kingsthorpe on 15 January 2001. Changes in hard seed levels over the ensuing summer-autumn seed softening period were measured. The initial hard seed content in each species ranged from 20 to 79% in H. coronarium; 31 to 79% in H. carnosum; and 54 to 83% in H. flexuosum. No significant difference in the time of seed softening between accessions or species was identified. Despite the similar timing, the extent of softening varied greatly between accessions and species. The proportion of initially hard seed that softened ranged from 54 to 95% in H. coronarium; 27 to 45% in H. carnosum; and 50 to 74% in H. flexuosum. Accessions of H. coronarium and H. flexuosum softened the greatest proportion of seed between 15 January and 22 February with reducing amounts thereafter. Accessions of H. carnosum softened less seed over this period, appearing to display a slower, more constant rate of softening. Although total hard seed levels were relatively low, there was sufficient variability in hard seed levels to provide some scope for selection of desired hard seed characteristics.

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Section: Softened Seedmentioning

confidence: 74%

First year seed softening in three Hedysarum spp. in southern Queensland

Bell¹,

Lloyd²,

Bell³

et al. 2003

Aust. J. Exp. Agric.

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“…Among other annual colonizing species, the trait most commonly demonstrating an association with the environment is flowering time, with within species early flowering commonly associated with a short growing season (Woodward and Morley, 1974;Ehrman and Cocks, 1996;Cocks, 1999). For example, Woodward and Morley (1974) concluded that variation in flowering time contributed to the success of Trifolium glomeratum in both south-western and south-eastern Australia.…”

Section: Discussionmentioning

confidence: 99%

Adaptive Significance of Within-site Variation in Morphological and Reproductive Traits of Naturalized Wild Radish (Raphanus raphanistrum) Populations in South-Western Australia

Bhatti

Cocks²,

Bennett

et al. 2016

IJAB

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To cite this paper: Bhatti, M.A., P.S. Cocks, S.J. Bennett and A.U. Malik, 2016. Adaptive significance of within-site variation in morphological and reproductive traits of naturalized wild radish (Raphanus raphanistrum) populations in South-Western Australia. AbstractGenotypic variation between and within populations of the outbreeding wild radish (Raphanus raphanistrum L.), was studied using seeds collected from 55 sites across the West Australian wheat belt along 2 transects in December 1999 and February 2000. The seeds were grown at the University of Western Australia field station at Shenton Park, Perth, WA over the 2000 growing season, and 14 morphological and phenological characters were scored. A high degree of variation was present in all traits, and within site variation was greater than between sites. The greatest variation was recorded in the reproductive traits such as time to flowering, seed weight, and pod weight. Variation between sites was associated with geo-clusters based primarily on rainfall and temperature. Populations from sites with a high annual rainfall and low average temperature had longer and wider pods, larger seeds and pods with more segments, compared to populations from sites with a low annual rainfall and a high average temperature. These plants also tended to flower later than those from hotter, drier sites. The results show that wild radish in the wheat-belt of Western Australia has formed genotypically distinct populations in the 150 years since it was introduced, that are adapted to the climate at the site of collection.

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“…Therefore, an understanding of species' life-histories can help in determining which species are most susceptible to ecosystem fragmentation. In Cabo de Gata Natural Park, forest-gap species that have restricted dispersal, e.g., Phlomis purpurea, Cistus albidus, Teucrium pseudochamaepytis, Genista spartioides, and Brachypodium retusum (the only grass species, along with Bromus rubens, sensitive to patch size, and species that actively restrict and hamper dispersal (antitelechory) by myxospermy, which are predominant in arid regions (Ehrman and Cocks, 1996), e.g., Helianthemum almeriensis (Melendo et al, 2003) and Linum strictum (Hensen, 1999), are very sensitive to the effects of fragmentation and exhibited a significant positive correlation between patch size and the long-range spatial autocorrelation. Those species recolonize more slowly than do wind-dispersed species, e.g., the flying, anemochorous Launaea lanifera, which tend to dominate the early stages of succession (Dzwonko and Loster, 1992), and vertebrate dispersers, e.g., Olea europaea var.…”

Section: Discussionmentioning

confidence: 99%

Do vegetation patch spatial patterns disrupt the spatial organization of plant species?

Alados¹,

Navarro

Komac³

et al. 2009

Ecological Complexity

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Keywords: Beta diversity Detrended Fluctuation Analyses Fractals Fragmentation Spatial patternsThe mechanisms that structure plant diversity and generate long-range correlated spatial patterns have important implications for the conservation of fragmented landscapes. The ability to disperse and persist influences a plant species' capacity for spatial organization, which can play a critical role in structuring plant diversity in metacommunities. This study examined the spatial patterns of species diversity within a network of patches in Cabo de Gata Natural Park, southeastern Spain. The objectives were to understand how the spatial heterogeneity of species composition (beta diversity) varies in a structured landscape, and how the long-range spatial autocorrelation of plant species is affected by the spatial configuration of patches.The mechanisms underlying the spatial distribution of plants acted at two scales. Between patches, spatial variation in species distributions was greater than that expected based on spatial randomization, which indicated that movement among patches was restricted. Within patches, diffusion processes reduced spatial variability in species distributions, and the effect was more prominent in large patches. Small patch size negatively influenced the long-range spatial autocorrelation of characteristic species, whereas interpatch distance had a stronger effect on species frequency than it had on the disruption of spatial organized patterns.The long-range spatial autocorrelation was evaluated based on the dispersal abilities of the species. Among the 106 species evaluated, 39% of the woody species, 17% of the forbs, and 12% of the grasses exhibited disrupted long-range spatial autocorrelation where patches were small. The species that are more vulnerable to the effects of fragmentation tended to be those that have restricted dispersal, such as those that have short-range dispersal (atelechoric), e.g., Phlomis purpurea, Cistus albidus, Teucrium pseudochamciepytis, Brachypodium retusum, and the ballistic species, Genista spartioides. Helicmthemum almeriense is another vulnerable species that has actively restricted dispersal (antitelechory), which is common in arid regions. Wind dispersers such as Launaea \anifera were less vulnerable to the effects of fragmentation. Long-distance dispersers whose persistence depends on facilitative interactions with other individuals, e.g., allogamous species such as Thymus hyemalis, Ballota hirsuta, and Anthyllis cytisoides, exhibit disrupted long-range spatial autocorrelation when patch size is reduced.

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Reproductive patterns in annual legume species on an aridity gradient

Cited by 83 publications

References 49 publications

First year seed softening in three Hedysarum spp. in southern Queensland

First year seed softening in three Hedysarum spp. in southern Queensland

Adaptive Significance of Within-site Variation in Morphological and Reproductive Traits of Naturalized Wild Radish (Raphanus raphanistrum) Populations in South-Western Australia

Do vegetation patch spatial patterns disrupt the spatial organization of plant species?

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