Integrating demographic and genetic approaches in plant conservation

Oostermeijer, J.G.B.; Luijten, S.H.; Nijs, J.C.M. den

doi:10.1016/s0006-3207(03)00127-7

Cited by 245 publications

(174 citation statements)

References 40 publications

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“…Population biology and conservation genetics can be very much viewed as overlapping disciplines in conservation biology, with population biology covering demographic, life-history and genetic characteristics of populations, whereas conservation genetics not only covers a broad range of research in population genetics but also issues relating to the identification of conservation units, systematics and forensics. We have combined these two disciplines in this section, partly because many studies use combined demographic and genetic approaches to better inform conservation actions and also because we strongly believe that studies which combine information from these disciplines should be encouraged as they inevitably lead to a much broader understanding of the key issues that should be considered for the conservation of populations and species (see Oostermeijer et al 2003). The six papers in this section cover a very broad range of topics, including habitat fragmentation, fire ecology, demography and mating systems.…”

Section: Population Biology and Geneticsmentioning

confidence: 99%

Current perspectives in plant conservation biology

Coates¹,

Dixon

2007

Aust. J. Bot.

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Section: Population Biology and Geneticsmentioning

confidence: 99%

Current perspectives in plant conservation biology

Coates¹,

Dixon

2007

Aust. J. Bot.

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“…The consequences of human actions on landscape connectivity are twofold. On the one hand, natural habitats are increasingly being fragmented, which negatively affects the population viability of many species (e.g., Young and Clarke 2000;Oostermeijer et al 2003). On the other hand, natural barriers that originally played an important role in speciation processes are being broken down by the creation of infrastructure (roads, waterways), so that previously isolated sister species can hybridize after establishing secondary contact (Rhymer and Simberloff 1996;Francisco-Ortega et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Human-induced hybridization among congeneric endemic plants on Tenerife, Canary Islands

et al. 2012

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Endemic genera on oceanic islands often evolved striking morphological and ecological differences among species, with weak postzygotic reproductive isolation. Human activities can lead to increased connectivity and can thereby promote secondary contact and hybridization between previously isolated species. We studied this phenomenon in three species of the genus Pericallis (Asteraceae) on Tenerife, Canary Islands. A total of 53 populations was sampled, including morphologically uniform as well as mixed populations containing morphologically diverse individuals. All plants were analyzed both genetically using AFLP markers and morphometrically. As expected, morphological analysis clearly separated the plants from the uniform populations in three clusters, with distinguishing characters corresponding to those used in species identification. The three species were also grouped into distinct genetic clusters in a STRUCTURE analysis, although no private alleles were observed. Adding the mixed population data to the analyses provided evidence for extensive hybridization among species, predominantly between P. cruenta and P. echinata, and between P. cruenta and P. tussilaginis, and morphological and genetic signals were congruent. The mixed populations were geographically located in between the uniform populations and were found in road verges significantly more often than the uniform populations. The observed distribution strongly suggests that hybridization between originally isolated species is recent, promoted by secondary contact due to human disturbance and the construction of roads.

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“…These possible dangers for small populations motivated recent studies that explored the effect of population size and/or genetic diversity on plant performance measured as seed production, seed germination or plant growth (e.g. SCHMIDT & JENSEN 2000, MUSTAJARVI et al 2001, LIENERT et al 2002, PASCHKE et al 2002, OOSTERMEIJER et al 2003. Most of these studies indicate poorer performance of individuals in small populations.…”

Section: Introductionmentioning

confidence: 99%

Effect of population size on the prospect of species survival

Münzbergová

2006

Folia Geobot

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Abstract:Many recent studies have demonstrated a negative effect of small population size on single plant traits. However, not much is known about the actual consequences of reduced plant performance on the long-term prospect of species survival.I studied the effect of population size on population growth rate and survival probability in the rare perennial herb Scorzonera hispanica occurring in fragmented grasslands. Its performance was measured using several traits related to reproduction in 21 populations ranging in size from 3 to 2475 plants. These data were then connected with data on full demography of the species from three of the studied populations. Two different matrix models differing in the number of transitions based on measurements in the populations differing in size were used to explore the relationship between population size and population growth rate.Both matrix models showed that despite the decline in seed production in small populations, population growth rate is never significantly different from one, and the populations could thus be expected to survive in the long run. Calculations of extinction probabilities that take into account demographic and environmental stochasticity, however, showed that populations below 100 flowering individuals have a high probability to become extinct. This demonstrates that demographic and environmental stochasticity is an important driver of the fate of small populations in this system. This study demonstrates that estimation of population growth rate can provide new insights into the effect of population size on population growth and survival. It also shows how matrix models enable the combination various pieces of information about the single populations into one overall measure, and may provide a useful tool for the standardization of studies on the effects of population size on population performance.

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Integrating demographic and genetic approaches in plant conservation

Cited by 245 publications

References 40 publications

Current perspectives in plant conservation biology

Current perspectives in plant conservation biology

Human-induced hybridization among congeneric endemic plants on Tenerife, Canary Islands

Effect of population size on the prospect of species survival

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