Meta-analysis on the association of population size and life history with inbreeding depression in plants

Angeloni, F.; Ouborg, N. Joop; Leimu, Roosa

doi:10.1016/j.biocon.2010.08.016

Cited by 198 publications

(221 citation statements)

References 42 publications

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“…teretifolius as a result of a long history of inbreeding or from founder effects or extreme bottlenecks during the evolution of the subspecies (Gibson et al, 2012). Support for the hypothesis of purging of genetic load in small populations has also been found in other species (Angeloni et al, 2011).…”

Section: Discussionmentioning

confidence: 55%

“…Indeed, several reviews of empirical studies have attempted to identify patterns in the genetic responses of plant species to habitat fragmentation (Hobbs and Yates, 2003;Coates et al, 2007;Honnay and Jacquemyn, 2007;Aguilar et al, 2008;Angeloni et al, 2011). These reviews have found that responses cannot be generalized across species but are influenced by factors such as abundance, longevity and particularly the mating system and gene dispersal.…”

Section: Introductionmentioning

confidence: 99%

“…These reviews have found that responses cannot be generalized across species but are influenced by factors such as abundance, longevity and particularly the mating system and gene dispersal. For example, Angeloni et al (2011) found that the effects of inbreeding depression decrease with decreasing natural population size. They attributed this finding to there being either an existing higher level of inbreeding depression in small populations and/or increased impact of purging of deleterious genes in small populations.…”

Section: Introductionmentioning

confidence: 99%

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Contemporary pollen-mediated gene immigration reflects the historical isolation of a rare, animal-pollinated shrub in a fragmented landscape

Sampson¹,

Byrne

Yates

et al. 2013

Heredity

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Fragmentation is generally considered to have negative impacts on widespread outbreeders but impacts on gene flow and diversity in patchy, naturally rare, self-compatible plant species remain unclear. We investigated diversity, gene flow and contemporary pollen-mediated gene immigration in the rare, narrowly distributed endemic shrub Calothamnus quadrifidus ssp. teretifolius. This taxon occurs in an internationally recognized biodiversity hotspot subjected to recent human-induced fragmentation and the condition of the remnants ranges from intact to highly degraded. Using microsatellites, we found that inbreeding, historically low gene flow and significant population differentiation have characterized the genetic system of C. quadrifidus ssp. teretifolius. Inbreeding arises from self-pollination, a small amount of biparental inbreeding and significant correlation of outcross paternity but fecundity was high suggesting populations might have purged their lethals. Paternity analyses show that pollinators can move pollen over degraded and intact habitat but populations in both intact and degraded remnants had few pollen parents per seed parent and low pollen immigration. Genetic diversity did not differ significantly between intact and degraded remnants but there were signs of genetic bottlenecks and reduced diversity in some degraded remnants. Overall, our study suggests human-induced fragmentation has not significantly changed the mating system, or pollen immigration to, remnant populations and therefore genetic connectivity need not be the highest conservation priority. Rather, for rare species adapted to higher levels of inbreeding, conservation efforts may be best directed to managing intact habitats and ecosystem processes.

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contemporary pollen-mediated gene immigration reflects the historical isolation of a rare, animal-pollinated shrub in a fragmented landscape

Sampson¹,

Byrne

Yates

et al. 2013

Heredity

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“…Some studies have found a greater intensity of ID in stressful or natural environments compared to benign or controlled environments (Keller and Waller, 2002;Armbruster and Reed, 2005). However, in their meta-analysis, Angeloni et al (2011) found no significant differences between field studies and greenhouse or common garden studies, even though the values of ID were generally reported to be greater in the field studies.…”

Section: Introductionmentioning

confidence: 93%

“…In such populations, the limited availability of cross-pollen may lead to increased ID as a result of breeding between related individuals (Ellstrand and Elam, 1993;Richards et al, 1999;Severns, 2003). On the other hand, ID should be lower in populations with a long history of inbreeding, where the selection may have purged the genome of its genetic load, whereas high levels of ID may arise after a sudden reduction in population size (Lande and Schemske, 1985;Keller and Waller, 2002;Angeloni et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Contrasting inbreeding depression in early and late stages of the life cycle of a Mediterranean shrub, Anagyris foetida (Leguminosae)

Valtueña

López²,

Ortega‐Olivencia³

2014

Turk J Bot

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Anagyris foetida L. has a Mediterranean distribution, but its populations are highly fragmented. This, together with its mixed mating system, puts it at clear risk of being strongly affected by inbreeding depression. To determine the effect of inbreeding depression in this species, hand pollinations were performed during the 2003/04 season in 2 populations from SW Spain to generate selfed and outcrossed seeds. These seeds were divided in 2 sample lots and seedlings were obtained in different years. During the first year of life the first lot showed no differences in vegetative parameters between the 2 populations, so that no differentiation was made between populations in analyzing the results. Reproductive parameters were determined during the first 2 flowering periods in the second sample lot. The results showed inbreeding depression to be manifest in the populations studied throughout the life cycle, adversely affecting the reproductive parameters more than the vegetative parameters, with the male capacity being strongly affected. This shows the need to study the entire life cycle to understand how it is affected by inbreeding depression, and to analyze more than one flowering period in long-lived species. The findings may have important implications for the long-term conservation management of these populations.

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Continuous inbreeding affects genetic variation, phenology, and reproductive strategy in ex situ cultivated Digitalis lutea

Sandner

Gemeinholzer

Lemmer

et al. 2022

American J of Botany

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Premise: Ex situ cultivation is important for plant conservation, but cultivation in small populations may result in genetic changes by drift, inbreeding, or unconscious selection. Repeated inbreeding potentially influences not only plant fitness, but also floral traits and interactions with pollinators, which has not yet been studied in an ex situ context. Methods: We studied the molecular genetic variation of Digitalis lutea from a botanic garden population cultivated for 30 years, a frozen seed bank conserving the original genetic structure, and two current wild populations including the source population. In a common garden, we studied the effects of experimental inbreeding and betweenpopulation crosses on performance, reproductive traits, and flower visitation of plants from the garden and a wild population. Results: Significant genetic differentiation was found between the garden population and the wild population from which the seeds had originally been gathered. After experimental selfing, inbreeding depression was only found for germination and leaf size of plants from the wild population, indicating a history of inbreeding in the smaller garden population. Moreover, garden plants flowered earlier and had floral traits related to selfing, whereas wild plants had traits related to attracting pollinators. Bumblebees visited more flowers of outbred than inbred plants and of wild than garden plants. Conclusions: Our case study suggests that high levels of inbreeding during ex situ cultivation can influence reproductive traits and thus interactions with pollinators. Together with the effects of genetic erosion and unconscious selection, these changes may affect the success of reintroductions into natural habitats.

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Meta-analysis on the association of population size and life history with inbreeding depression in plants

Cited by 198 publications

References 42 publications

Contemporary pollen-mediated gene immigration reflects the historical isolation of a rare, animal-pollinated shrub in a fragmented landscape

Contemporary pollen-mediated gene immigration reflects the historical isolation of a rare, animal-pollinated shrub in a fragmented landscape

Contrasting inbreeding depression in early and late stages of the life cycle of a Mediterranean shrub, Anagyris foetida (Leguminosae)

Continuous inbreeding affects genetic variation, phenology, and reproductive strategy in ex situ cultivated Digitalis lutea

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