Jonathan Silvertown

Research publications

 

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Papers by topic:

Community ecology (also see Phylogeny & ecology)


Tofts, R. & Silvertown, J. (2002) Community assembly from the local species pool: an experimental study using congeneric species pairs. Journal of Ecology, 90, 385-393.


Tofts, R. & Silvertown, J. (2000) Niche differences and their relation to species' traits in Cirsium vulgare and Cirsium eriophorum. Folia Geobotanica, 35, 231-240.


Silvertown, J. & Wilson, J.B. (2000). Spatial interactions among grassland plant populations. In The geometry of ecological interactions (eds. U. Dieckman, R. Law & H. Metz), pp. 28-47. Cambridge University Press, Cambridge.


Silvertown, J., Dodd, M.E., Gowing, D., & Mountford, O. (1999) Hydrologically-defined niches reveal a basis for species-richness in plant communities. Nature, 400, 61-63.


Wilson, J.B., Lines, C.E.M., & Silvertown, J. (1996) Grassland community structure under different grazing regimes, with a method for examining species associations when local richness is constrained. Folia Geobotanica & Phytotaxonomica, 31, 197-206.


Wilson, J.B., Wells, T.C.E., Trueman, I.C., Jones, G., Atkinson, M.D., Crawley, M.J., Dodd, M.E., & Silvertown, J. (1996) Are there assembly rules for plant species abundance? An investigation in relation to soil resources and successional trends. Journal of Ecology, 84, 527-538.


Silvertown, J., Lines, C.E.M., & Dale, M.P. (1994) Spatial competition between grasses - rates of mutual invasion between 4 species and the interaction with grazing. Journal of Ecology, 82, 31-38.


Silvertown, J. & Wilson, J.B. (1994) Community structure in a desert perennial community. Ecology, 75, 409-417.


Silvertown, J., Holtier, S., Johnson, J., & Dale, P. (1992) Cellular automaton models of interspecific competition for space - the effect of pattern on process. Journal of Ecology, 80, 527-534.


Silvertown, J. & Dale, P. (1991) Competitive hierarchies and the structure of herbaceous plant communities. Oikos, 61, 441-444.


Silvertown, J. & Law, R. (1987) Do plants need niches? Trends in Ecology and Evolution, 2, 24-26.


Silvertown, J. (1985) Fertile arguments in the desert. Nature, 316, 298.


Silvertown, J. (1983) The distribution of plants in limestone pavement: tests of species interaction and niche separation against null hypotheses. Journal of Ecology, 71, 819-828.


Harvey, P.H., Colwell, R., Silvertown, J., & May, R.M. (1983) Null models in ecology. Annual Review of Ecology & Systematics, 14, 189-211.


Silvertown, J. (1979) The maintenance of species diversity in grassland, with particular reference to chalk grassland. D.Phil., University of Sussex.


Comparative demography


Franco, M. & Silvertown, J. (2004) Comparative demography of plants based upon elasticities of vital rates. Ecology, 85, 531-538.


Silvertown, J., Franco, M., & Menges, E. (1996) Interpretation of elasticity matrices as an aid to the management of plant populations for conservation. Conservation Biology, 10, 591-597.


Franco, M. & Silvertown, J. (1996) Life history variation in plants: An exploration of the fast-slow continuum hypothesis. Philosophical Transactions of the Royal Society of London Series B - Biological Sciences, 351, 1341-1348.


Enright, N.J., Franco, M., & Silvertown, J. (1995) Comparing plant life histories using elasticity analysis: The importance of lifespan and the number of life cycle stages. Oecologia, 104, 79-84.


Franco, M. & Silvertown, J. (1994) On trade-offs, elasticities and the comparative method: a reply to Shea, Rees & Wood. Journal of Ecology, 82, 958.


Silvertown, J. & Franco, M. (1993) Plant demography and habitat: a comparative approach. Plant Species Biology, 8, 67-73.


Silvertown, J., Franco, M., Pisanty, I., & Mendoza, A. (1993) Comparative plant demography - relative importance of Life-Cycle components to the finite rate of increase in woody and herbaceous perennials. Journal of Ecology, 81, 465-476.


Silvertown, J., Franco, M., & Mcconway, K. (1993) The eternal triangle - an attempt at reconciliation. Functional Ecology, 7, 380-381.


Franco, M. & Silvertown, J. (1990) Plant demography: What do we know? Evol.Trends Plants, 4, 74-76.


Silvertown, J., Franco, M., & McConway, K. (1992) A demographic interpretation of Grime's triangle. Functional Ecology, 6, 130-136.


Silvertown, J. & Tremlett, M. (1989) Interactive effects of disturbance and shade upon colonization of grassland: an experiment with Anthriscus sylvestris, Conium maculatum , Daucus carota and Heracleum sphodylium. Functional Ecology, 3, 229-235.

 


Evolutionary ecology of plants:

General, Herbs, Seeds, Trees, Plant behaviour


General


Silvertown, J. (2008) The evolutionary maintenance of sex: evidence from the ecological distribution of asexual reproduction in clonal plants. International Journal of Plant Sciences, 169, 157-168.


Silvertown, J., Franco, M., & Perez-Ishiwara, R. (2001) Evolution of senescence in iteroparous perennial plants. Evolutionary Ecology Research, 3, 1-20.


Silvertown, J. (2001). Plants stand still, but their genes don't: non-trivial consequences of the obvious. In Integrating ecology and evolution in a spatial context (eds J. Silvertown & J. Antonovics), pp. 3-20. Blackwell, Oxford.


Silvertown, J. (1991) Dorothy's dilemma and the unification of plant population biology. Trends in Ecology & Evolution, 6, 346-348.


Silvertown, J. (1989) A binary classification of plant life histories and some possibilities for its evolutionary application. Evolutionary Trends in Plants, 3, 87-90.


Silvertown, J. (1987) The evolution of hermaphroditism. An experimental test of the resource model. Oecologia, 72, 157-159.


Herbs


Silvertown, J. (1986) "Biennials": reply to Kelly. American Naturalist, 127, 721-724.


Silvertown, J. (1984) Death of the elusive biennial. Nature, 310, 271.


Silvertown, J. (1983) Why are biennials sometimes not so few? American Naturalist, 121, 448-453.


Seeds


Silvertown, J. & Bullock, J.M. (2003) Do seedlings in gaps interact? A field test of assumptions in ESS seed size models. Oikos, 101, 499-504.


Silvertown, J. (1992) An experimental test of Frequency-Dependent fitness in mixtures of the 2 seed morphs of Spergula arvensis. Acta Oecologica, 13, 627-634.


Silvertown, J. (1992). Seeds in natural populations and their significance for plant conservation. In Conservation Biology. A Training Manual for Biological Diversity and genetic resources (eds P. Kapoor-Vijay & J. White), pp. 133-145. Commonwealth Science Council, London.


Silvertown, J. & Smith, B. (1988) Gaps in the canopy: the missing dimension in vegetation dynamics. Vegetatio, 77, 56-60.


Silvertown, J. (1988) The demographic and evolutionary consequences of seed dormancy. In Plant population ecology (eds A.J. Davy, M.J.Hutchings & A.R.Watkinson), pp. 205-219. Blackwell Scientific Publications, Oxford.


Silvertown, J. (1985). When plants play the field. In Evolution: essays in honour of John Maynard Smith (eds P. Greenwood, P.H. Harvey & M. Slatkin), pp. 143-153. Cambridge University Press,, Cambridge.


Silvertown, J. (1984) Phenotypic variety in seed germination behaviour: the ontogeny and evolution of somatic polymorphism in seeds. American Naturalist, 124, 1-16.


Silvertown, J. (1981) Seed Size, Life-Span, and Germination Date as Co-Adapted Features of Plant Life-History. American Naturalist, 118, 860-864.


Silvertown, J. (1980) Leaf-canopy induced seed dormancy in a grassland flora. New Phytologist, 85, 109-118.


Trees


Dodd, M.E. & Silvertown, J. (2000) Size-specific fecundity and the influence of lifetime size variation upon effective population size in Abies balsamea. Heredity, 85, 604-609.


Silvertown, J. & Dodd, M.E. (1999) Evolution of life history in balsam fir (Abies balsamea) in sub-alpine forests. Proceedings of the Royal Society of London B, 266, 729-733.


Silvertown, J. & Dodd, M.E. (1999) The demographic cost of reproduction and its consequences in balsam fir (Abies balsamea). American Naturalist, 154, 321-332.


Silvertown, J. (1996) Are sub-alpine firs evolving towards semelparity? Evolutionary Ecology, 10, 77-80.


Silvertown, J. (1980) The evolutionary ecology of mast seeding in trees. Biological Journal of the Linnean Society, 14, 235-250.



Plant behaviour


Silvertown, J. (1998) Plant phenotypic plasticity and non-cognitive behaviour. Trends In Ecology & Evolution, 13, 255-256.


Silvertown, J. & Gordon, D. (1989) A framework for plant behaviour. Annual Review of Ecology & Systematics, 20, 349-366.


Silvertown, J. & Rabinowitz, D. (1985) Reproductive decisions in the botanical world. New Scientist, 32-34.



Historical ecology


Silvertown, J. (1985) History of a latitudinal diversity gradient: woody plants in Europe 13,000 -- 1000 years B.P. Journal of Biogeography, 12, 519-525.


Silvertown, J. (1978) The history of woodlands in Hornsey. London Naturalist, 57, 11-25.



Park Grass experiment


Silvertown, J., Biss, P.M., Freeland, J. (2008) Community genetics: resource addition has opposing effects on genetic and species diversity in a 150-year experiment. Ecology Letters 12, 165-170.


Freville, H., McConway, K., Dodd, M. & Silvertown, J. (2007) Prediction of extinction in plants: Interaction of extrinsic threats and life history traits. Ecology, 88, 2662-2672.


Silvertown, J., Poulton, P., Johnston, A.E., Edwards, G., Heard, M., & Biss, P.M. (2006) The Park Grass Experiment 1856 - 2006: Its Contribution to Ecology. Journal of Ecology, 94, 801-814.


Silvertown, J., Servaes, C., Biss, P., & Macleod, D. (2005) Reinforcement of reproductive isolation between adjacent populations in the Park Grass Experiment. Heredity, 95, 198-205.


Freville, H. & Silvertown, J. (2005) Analysis of interspecific competition in perennial plants using life table response experiments. Plant Ecology, 176, 69-78.


Crawley, M.J., Johnston, A.E., Silvertown, J., Dodd, M., de Mazancourt, C., Heard, M.S., Henman, D.F., & Edwards, G.R. (2005) Determinants of species richness in the park grass experiment. American Naturalist, 165, 179-192.


Biss, P., Freeland, J., Silvertown, J., McConway, K.J., & Lutman, P. (2003) Successful amplification of rice chloroplast microsatellites from century-old grass samples from the Park Grass Experiment. Plant Molecular Biology Reporter, 21, 249-257.


Silvertown, J., McConway, K.J., Hughes, Z., Biss, P., Macnair, M., & Lutman, P. (2002) Ecological and genetic correlates of long-term population trends in the park grass experiment. American Naturalist, 160, 409-420.


Wilson, J.B., Crawley, M.J., Dodd, M.E., & Silvertown, J. (1996) Evidence for constraint on species coexistence in vegetation of the Park Grass experiment. Vegetatio, 124, 183-190.


Dodd, M., Silvertown, J., Mcconway, K., Potts, J., & Crawley, M. (1995) Community stability: A 60-year record of trends and outbreaks in the occurrence of species in the Park Grass Experiment. Journal of Ecology, 83, 277-285.


Silvertown, J., Dodd, M., McConway, K., Crawley, M., & Potts, J. (1995) Species diversity and stability in grassland. Trends in Ecology and Evolution, 10, 287-288.


Dodd, M.E., Silvertown, J., Mcconway, K., Potts, J., & Crawley, M. (1994) Application of the British National Vegetation Classification to the Communities of the Park Grass Experiment Through Time. Folia Geobotanica & Phytotaxonomica, 29, 321-334.


Dodd, M.E., Silvertown, J., Mcconway, K., Potts, J., & Crawley, M. (1994) Stability in the plant communities of the Park Grass Experiment: The relationships between species richness, soil pH and biomass variability. Philosophical Transactions of the Royal Society of London Series B - Biological Sciences, 346, 185-193.


Silvertown, J., Dodd, M.E., Mcconway, K., Potts, J., & Crawley, M. (1994) Rainfall, biomass variation, and community composition in the Park Grass Experiment. Ecology, 75, 2430-2437.


Tilman, D., Dodd, M.E., Silvertown, J., Poulton, P.R., Johnston, A.E., & Crawley, M.J. (1994). The Park Grass Experiment: Insights from the Most Long-Term Ecological Study. In Long - Term Experiments in Agricultural and Ecological Sciences (eds R.A. Leigh & A.E. Johnston), pp. 287-303. C a B International, Wallingford, United Kingdom 0X10 8DE.


Silvertown, J. (1987) Ecological stability: a test case. American Naturalist, 130, 807-810.


Silvertown, J.W. (1980) The dynamics of a grassland ecosystem: botanical equilibrium in the Park Grass Experiment. Journal of Applied Ecology, 17, 491-504.


Phylogeny and ecology


Silvertown, J., Dodd, M., Gowing, D., Lawson, C. & McConway, K. (2006) Phylogeny and the hierarchical organization of plant diversity. Ecology, 87, S39-S49.


Silvertown, J., McConway, K.J., Gowing, D.J., Dodd, M.E., Fay, M.F., Joseph, J.A., & Dolphin, K. (2006) Absence of phylogenetic signal in the niche structure of meadow plant communities. Proceedings of the Royal Society of London B.,273, 39-44.


Silvertown, J., Francisco-Ortega, J., & Carine, M. (2005) The monophyly of island radiations: an evaluation of niche pre-emption and some alternative explanations. Journal of Ecology, 93, 653-657.


Silvertown, J. (2004) The ghost of competition past in the phylogeny of island endemic plants. Journal of Ecology, 92, 168-173.


Silvertown, J., Dodd, M., & Gowing, D. (2001) Phylogeny and the niche structure of meadow plant communities. Journal of Ecology, 89, 428-435.


Tofts, R. & Silvertown, J. (2000) A phylogenetic approach to community assembly from a local species pool. Proceedings of the Royal Society of London B, 267, 363-370.


Silvertown, J. & Dodd, M. (1997). Comparing plants and connecting traits. In Plant life histories: Ecology, phylogeny and evolution (eds J. Silvertown, M. Franco & J.L. Harper), pp. 3-16. Cambridge University Press, Cambridge.



Population dynamics (mostly grassland plants)


Bullock, J.M., Franklin, J., Stevenson, M.J., Silvertown, J., Coulson, S.J., Gregory, S.J., & Tofts, R. (2001) A plant trait analysis of responses to grazing in a long-term experiment. Journal of Applied Ecology, 38, 253-267.


Clear Hill, B.H. & Silvertown, J. (1997) Higher-order interaction between molluscs and sheep affecting seedling numbers in grassland. Acta Oecologica, 18, 587-596.


Gillman, M.P. & Silvertown, J. (1997). Population extinction and IUCN categories: the uncertainty of ecological measurement. In The role of genetics in conserving small populations (eds T.E. Tew, T.J. Crawford, J.W. Spencer, D.P. Stevens, M.B. Usher & J. Warren), pp. 155-162. Joint Nature Conservation Committee, Peterborough.


Bullock, J.M., Silvertown, J., & Clear Hill, B. (1996) Plant demographic responses to environmental variation: Distinguishing between effects on age structure and effects on age-specific vital rates. Journal of Ecology, 84, 733-743.


Bullock, J.M., Clear Hill, B., Silvertown, J., & Sutton, M. (1995) Gap Colonization as a Source of Grassland Community Change - Effects of Gap Size and Grazing on the Rate and Mode of Colonization by Different Species. Oikos, 72, 273-282.


Bullock, J.M., Clear Hill, B., & Silvertown, J. (1994) Demography of Cirsium vulgare in a grazing experiment. Journal of Ecology, 82, 101-111.


Bullock, J.M., Clear Hill, B., & Silvertown, J. (1994) Tiller dynamics of two grasses - Responses to grazing, density and weather. Journal of Ecology, 82, 331-340.


Bullock, J.M., Clear Hill, B., Dale, M.P., & Silvertown, J. (1994) An Experimental Study of the Effects of Sheep Grazing on Vegetation Change in a Species-Poor Grassland and the Role of Seedlings Recruitment into Gaps. Journal of Applied Ecology, 31, 493-507.


Silvertown, J., Wells, D.A., Gillman, M., Dodd, M.E., Robertson, H., & Lakhani, K.H. (1994) Short-Term Effects and Long-Term After-Effects of Fertilizer Application on the Flowering Population of Green-Winged Orchid Orchis morio. Biological Conservation, 69, 191-197.


Briske, D.D. & Silvertown, J. (1993) Plant demography and grassland community balance: the contribution of population regulation mechanisms. In XVII International Grassland Congress, Palmerston North, New Zealand.


Gillman, M., Bullock, J.M., Silvertown, J., & Clear Hill, B. (1993) A Density-Dependent model of Cirsium vulgare population dynamics using Field-Estimated parameter values. Oecologia, 96, 282-289.


Silvertown, J., Watt, T.A., Smith, B., & Treweek, J.R. (1992) Complex effects of grazing treatment on the establishment, growth, survival & reproduction of an annual in a species-poor grassland community. Journal of Vegetation Science, 3, 35-40.


Silvertown, J. (1991) Modularity, reproductive thresholds and plant population dynamics. Functional Ecology, 5, 577-582.


Silvertown, J. & Smith, B. (1989) Germination and population structure of spear thistle Cirsium vulgare in relation to sheep grazing management of pasture. Oecologia, 81, 369-373.


Symonides, E., Silvertown, J., & Andreasen, V. (1986) Population cycles caused by overcompensating density-dependence in an annual plant. Oecologia, 71, 156-158.


Silvertown, J. (1985) Survival, fecundity and growth of wild cucumber Echinocystis lobata. Journal of Ecology, 73, 841-849.


Tremlett, M., Silvertown, J.W., & Tucker, C. (1984) An analysis of spatial and temporal variation in seedling survival of a monocarpic perennial, Conium maculatum. Oikos, 43, 41-45.


Silvertown, J.W. & Dickie, J.B. (1980) Seedling survivorship in natural populations of nine perennial chalk grassland plants. New Phytologist, 88, 555-558.



Primula vulgaris and heterostyly


Valverde, T. & Silvertown, J. (1998) Variation in the demography of a woodland understorey herb (Primula vulgaris) along the forest regeneration cycle: projection matrix analysis. Journal Of Ecology, 86, 545-562.


Valverde, T. & Silvertown, J. (1997) A metapopulation model for Primula vulgaris, a temperate forest understorey herb. Journal Of Ecology, 85, 193-210.


Valverde, T. & Silvertown, J. (1997) An integrated model of demography, patch dynamics and seed dispersal in a woodland herb, Primula vulgaris. Oikos, 80, 67-77.


Valverde, T. & Silvertown, J. (1997) Canopy closure rate and forest structure. Ecology, 78, 1555-1562.


Valverde, T. & Silvertown, J. (1995) Spatial variation in the seed ecology of a woodland herb (Primula vulgaris) in relation to light environment. Functional Ecology, 9, 942-950.


Boyd, M., Silvertown, J., & Tucker, C. (1990) Population ecology of heterostyle and homostyle Primula vulgaris: Growth, survival and reproduction in field populations. Journal of Ecology, 78, 799-813.



Seed ecology


Silvertown, J. (2004) Sustainability in a nutshell. Trends in Ecology and Evolution, 19, 276-278.


Silvertown, J. (1989) The paradox of seed size and adaptation. Trends in Ecology and Evolution, 4, 24-26.


Silvertown, J. & Smith, B. (1989) Mapping the microenvironment for seed germination in the field. Annals of Botany, 63, 163-167.


Silvertown, J., Smith, B., & Prince, S.D. (1988) A field instrument for mapping the microenvironment within grass canopies. Functional Ecology, 2, 263-268.


Silvertown, J. (1987) Possible sexual dimorphism in the double coconut: a reinterpretation of the data of Savidge and Ashton. Biotropica, 19, 282-283.


Silvertown, J. & Wilkin, F.R. (1983) An experimental test of the role of micro-spatial heterogeneity in the co-existence of congeneric plants. Biological Journal of the Linnean Society, 19, 1-8.


Silvertown, J. (1981) Micro-spatial heterogeneity and seedling demography in species rich grassland. New Phytologist, 88, 117-125.


Silvertown, J. (1980) Leaf-canopy induced seed dormancy in a grassland flora. New Phytologist, 85, 109-118.



Everything else


Silvertown, J. & McConway, K.J. (1997) Does ''publication bias''' lead to biased science? Oikos, 79, 167-168.


Silvertown, J. (1989) China's Silent Spring. New Scientist, 123, 55-58.


Silvertown, J. (1989) Plant competition. Nature, 337, 122-123.


Silvertown, J. (1989) Reply from J.Silvertown. Trends in Ecology and Evolution, 4, 145-146.

 
Recent papers (also listed under topics below)
Bartelheimer, M., Gowing, D. J. & Silvertown, J. (2010) Explaining hydrological niches: the decisive role of below-ground competition in two closely related Senecio species. Journal of Ecology, 98, 126-136. 

Silvertown, J. (2009) A new dawn for citizen science. Trends in Ecology and Evolution.

Silvertown, J., Biss, P.M., Freeland, J. (2009) Community genetics: resource addition has opposing effects on genetic and species diversity in a 150-year experiment. Ecology Letters, 12, 165-170. 

Silvertown, J. (2008) The evolutionary maintenance of sex: evidence from the ecological distribution of asexual reproduction in clonal plants. International Journal of Plant Sciences, 169, 157-168. 

Freville, H., McConway, K., Dodd, M. & Silvertown, J. (2007) Prediction of extinction in plants: Interaction of extrinsic threats and life history traits. Ecology, 88, 2662-2672. 

Silvertown, J., Poulton, P., Johnston, A.E., Edwards, G., Heard, M., & Biss, P.M. (2006) The Park Grass Experiment 1856 - 2006: Its Contribution to Ecology. Journal of Ecology, 94, 801-814. 

Silvertown, J., McConway, K.J., Gowing, D.J., Dodd, M.E., Fay, M.F., Joseph, J.A., & Dolphin, K. (2006) Absence of phylogenetic signal in the niche structure of meadow plant communities. Proceedings of the Royal Society of London B.,273, 39-44. 

Silvertown, J., Dodd, M., Gowing, D., Lawson, C. & McConway, K. (2006) Phylogeny and the hierarchical organization of plant diversity. Ecology, 87, S39-S49. 

Silvertown, J., Servaes, C., Biss, P., & Macleod, D. (2005) Reinforcement of reproductive isolation between adjacent populations in the Park Grass Experiment. Heredity, 95, 198-205. 

Silvertown, J., Francisco-Ortega, J., & Carine, M. (2005) The monophyly of island radiations: an evaluation of niche pre-emption and some alternative explanations. Journal of Ecology, 93, 653-657. 

Freville, H. & Silvertown, J. (2005) Analysis of interspecific competition in perennial plants using life table response experiments. Plant Ecology, 176, 69-78. 

Crawley, M.J., Johnston, A.E., Silvertown, J., Dodd, M., de Mazancourt, C., Heard, M.S., Henman, D.F., & Edwards, G.R. (2005) Determinants of species richness in the park grass experiment. American Naturalist, 165, 179-192. 

Franco, M. & Silvertown, J. (2004) Comparative demography of plants based upon elasticities of vital rates. Ecology, 85, 531-538. 

Silvertown, J. (2004) The ghost of competition past in the phylogeny of island endemic plants. Journal of Ecology, 92, 168-173. 

Silvertown, J. (2004) Plant coexistence and the niche. Trends in Ecology & Evolution, 19, 605-611. Research_publications_files/Bartelheimer%20et%20al%202010.pdfResearch_publications_files/Silvertown%20TREE%202009%20Citizen%20Science.pdfResearch_publications_files/Silvertown%20Biss%20%26%20Freeland%202008_1.pdfResearch_publications_files/Silvertown%20IJPS%202008_1.pdfResearch_publications_files/Fre%CC%81ville_et_al_Ecology_1.pdfResearch_publications_files/Silvertown%20et%20al.%202006_1.pdfResearch_publications_files/Silvertown%20et%20al%20ProcRS%202006_1.pdfResearch_publications_files/Silvertown%20et%20al.%202006%20Ecology_1.pdfResearch_publications_files/Silvertown%20et%20al.%202005%20Heredity_1.pdfResearch_publications_files/Silvertown_Francisco-Ortega_Carine_2005_1.pdfResearch_publications_files/Freville_Silvertown_2005_1.pdfResearch_publications_files/Crawley_etal_2005_1.pdfResearch_publications_files/Franco%20%26%20Silvertown%202004_1.pdfResearch_publications_files/Island%20endemics.pdfResearch_publications_files/Silvertown%20Niche%20Review%202004.pdfResearch_publications_files/Silvertown%20et%20al.%202006%20Ecology_2.pdf