Relationships between heterozygosity and fitness in the Iberian threatened larkspur Delphinium bolosii (Ranunculaceae)

Orellana, Maria-Renée; López‐Pujol, Jordi; Blanché, Cèsar; Bosch, María

doi:10.1016/j.flora.2006.06.002

Cited by 5 publications

(10 citation statements)

References 54 publications

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“…Compared to other endemic and threatened Iberian species, the expected heterozygosity of F. loscosii was intermediate between those of the very narrowly distributed Pyrenean Borderea chouardii (Gaussen) Heslot (H E = 0.046) and Borderea pyrenaica Miégeville (H E = 0.070) (Segarra‐Moragues & Catalán 2002), and NE Iberian Puccinellia pungens (Pau) Paunero (H E = 0.043; Pérez‐Collazos et al. 2007), and Delphinium bolosii Blanché and Molero (H E < 0.085; Orellana et al. 2007), and those of the more widespread Ebro valley Thymus loscosii (H E = 0.422; López‐Pujol et al.…”

Section: Discussionmentioning

confidence: 96%

“…2002; Caujapé‐Castells & Jansen 2003; Comes 2004; Martínez‐Ortega et al. 2004; Orellana et al. 2007).…”

Section: Discussionunclassified

“…In this respect, allozymes have proven to be a reliable technique, capable of detecting the genetic variability and structure of threatened, rare and endemic plants (Batista & Sosa 2002; Segarra‐Moragues & Catalán 2002; López‐Pujol et al. 2003, 2004; Cruse‐Sanders & Hamrick 2004; Pérez‐Collazos & Catalán 2006; Orellana et al. 2007).…”

Section: Introductionmentioning

confidence: 99%

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Conservation genetics of the endangered Iberian steppe plant Ferula loscosii (Apiaceae)

Pérez‐Collazos

Catalán

2008

Plant Biology

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Ferula loscosii (Lange) Willk (Apiaceae) is a threatened endemic species native to the Iberian Peninsula. The plant has a narrow and disjunct distribution in three regions, NE, C and SE Spain. Genetic variability within and among 11 populations from its natural distribution was assessed using allozymes. Intermediate levels of genetic diversity were detected in F. loscosii (P(99%) = 36.83; H(E) = 0.125; H(T) = 0.152). However, the highest genetic diversity (58%) corresponded to the threatened populations from SE and C Spain (H(T) = 0.169) rather than the more abundant and larger populations from NE Spain (Ebro valley) (H(T) = 0.122). Low to moderate levels of genetic structure were found among regional ranges (G(ST) = 0.134), and several statistical spatial correlation analyses corroborated substantial genetic differentiation among the three main regional ranges. However, no significant genetic differentiation was found among the NE Spain populations, except for a northernmost population that is geographically isolated. Outcrossing mating and other biological traits of the species could account for the maintenance of the present values of genetic diversity within populations. The existence of an ancestral late Tertiary wider distribution of the species in SE and C Spain, followed by the maintenance of different Quaternary refugia in these warmer areas, together with a more recent and rapid post-glacial expansion towards NE Spain, are arguments that could explain the low genetic variability and structure found in the Ebro valley and the higher levels of diversity in the southern Iberian populations.

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Section: Discussionmentioning

confidence: 96%

“…2002; Caujapé‐Castells & Jansen 2003; Comes 2004; Martínez‐Ortega et al. 2004; Orellana et al. 2007).…”

Section: Discussionunclassified

Section: Introductionmentioning

confidence: 99%

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Conservation genetics of the endangered Iberian steppe plant Ferula loscosii (Apiaceae)

Pérez‐Collazos

Catalán

2008

Plant Biology

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“…2007). No correlations between allozyme heterozygosity and three fitness components were observed in this perennial plant species (Orellana et al . 2007).…”

Section: Introductionmentioning

confidence: 89%

Heterozygosity–fitness correlations and their relevance to studies on inbreeding depression in threatened species

2008

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The majority of reported multilocus heterozygosity-fitness correlations (HFCs) are from large, outbred populations, and their relevance to studies on inbreeding depression in threatened populations is often stressed. The results of such HFC studies conducted on outbred populations may be of limited application to threatened population management, however, as bottlenecked populations exhibit increased incidence of inbreeding, increased linkage disequilibrium, reduced genetic diversity and possible effects of historical inbreeding such as purging. These differences may affect both our ability to detect inbreeding depression in threatened species, and our interpretation of the underlying mechanisms for observed heterozygosity-fitness relationships. The study of HFCs in outbred populations is of interest in itself, but the results may not translate directly to threatened populations that have undergone severe bottlenecks.

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“…For example, no correlation was found between heterozygosity and growth rate in Pinus contorta (Knowles and Mitton 1980) and P. ponderosa (Linhart and Mitton 1985), and no relationships were found between several vegetative and reproductive fitness-related traits and heterozygosity in P. sylvestris (Savolainen and Hedrick 1995). A positive association between heterozygosity and vegetative and generative fitness was also absent in Lychnis viscaria (Lammi et al 1999), in Swainsona recta (Buza et al 2000), and in Delphinium bolosii (Orellana et al 2007), whereas only a weak correlation was stated between vegetative fitness traits and heterozygosity in Swertia perennis (Lienert et al 2002). Moreover, meta-analyses of published correlation coefficients among multilocus heterozygosity and two fitness traits (growth rate and fluctuating asymmetry) have suggested that the strength of these relationships is generally weak in natural populations (Britten 1996).…”

Section: Discussionmentioning

confidence: 99%

No Correlation Between Heterozygosity and Vegetative Fitness in the Narrow Endemic and Critically Endangered Clematis acerifolia (Ranunculaceae)

López‐Pujol

Zhang

2008

Biochem Genet

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The relationship between heretozygosity and vegetative fitness was explored in the narrow endemic and threatened Clematis acerifolia (Ranunculaceae), both at individual and population levels. The relationships between fitness, habitat factors, and population size were also analyzed. Allozyme electrophoresis was used to quantify the levels of heterozygosity of nearly 200 surveyed individuals belonging to the nine extant populations of this species. Six parameters of vegetative fitness were measured: plant height, shrub diameter, length of the largest leaf, width of the largest leaf, mean number of leaves/stem, and total number of stems. The percentage of tree cover (light availability) was measured as an indicator of habitat quality. A principal component analysis reduced the original fitness variables to two uncorrelated principal components. None of these correlated significantly with both heterozygosity and population size, in contrast to the expected result. Nevertheless, one of the principal components showed a positive relationship with light availability, which may indicate that habitat quality may have significant effects on the performance of this species. Thus, to ensure the viability of this endangered species, maintenance of adequate habitat quality (by avoiding further fragmentation) may be more important than maximizing genetic diversity within populations.

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Relationships between heterozygosity and fitness in the Iberian threatened larkspur Delphinium bolosii (Ranunculaceae)

Cited by 5 publications

References 54 publications

Conservation genetics of the endangered Iberian steppe plant Ferula loscosii (Apiaceae)

Conservation genetics of the endangered Iberian steppe plant Ferula loscosii (Apiaceae)

Heterozygosity–fitness correlations and their relevance to studies on inbreeding depression in threatened species

No Correlation Between Heterozygosity and Vegetative Fitness in the Narrow Endemic and Critically Endangered Clematis acerifolia (Ranunculaceae)

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