When ecological marginality is not geographically peripheral: exploring genetic predictions of the centre-periphery hypothesis in the endemic plant<i>Lilium pomponium</i>

Casazza, Gabriele; Macrì, Carmelo; Dagnino, Davide; Guerrina, Maria; Juin, Marianick; Minuto, Luigi; Thompson, John D.; Baumel, Alex; Mèdail, Frédéric

doi:10.7717/peerj.11039

Cited by 9 publications

(15 citation statements)

References 72 publications

(104 reference statements)

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Section: Discussionsupporting

confidence: 86%

“…These results provide a parallel with the previous studies of genetic variability in relation to distribution limits and potential ecologically marginality [ 27 , 28 ]. Casazza et al [ 28 ] insist on the probable effects of local topographic variation that blur any possible relation between genetic variation and distribution limits. They suggest that a decrease of genetic diversity along environmental, but not geographical gradients, may be due to the presence of low-quality habitats in the different parts of the range.…”

Section: Discussionsupporting

confidence: 86%

“…In sites close to the range limits, one primary niche type predominates, whereas further from the distribution limits, three other niche types are more common. Thus, although the trend predicted for genetic diversity to decline towards range limits [ 29 ] is not apparent in this species [ 28 ], we observed here a decline in the diversity of realised niche conditions near the distribution limits. In addition, one of the niche types is rather unique to peripheral populations, where we have no evidence for poor performance.…”

Section: Discussioncontrasting

confidence: 65%

“…There is no apparent link between gradients of climatic conditions and trait variation other than a shift towards smaller flowers at high elevation [ 27 ]. In a study of genetic variability, Casazza et al [ 28 ] found no decline in genetic variability in peripheral populations of this species relative to those in the centre of its distribution, as would be predicted by the so-called centre–periphery hypothesis [ 29 ]. Climatic and/or ecological conditions may in fact have a mosaic distribution in the area of presence of L. pomponium , where mixed alpine and Mediterranean influences may interact along localised topographic gradients at different distances from the Mediterranean Sea.…”

Section: Introductionmentioning

confidence: 89%

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Niche Variation in Endemic Lilium pomponium on a Wide Altitudinal Gradient in the Maritime Alps

Fontaine

Gauthier

Casazza

et al. 2022

Plants

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The relationship between altitudinal and ecological gradients has long been a dominant theme in plant ecology; moreover, how species respond to climate change has renewed this interest. Mediterranean mountains are often hotspots of endemism, and some endemic species have local distributions that span different climatic belts; hence, local variations in topography and fine-scaled niche conditions may play crucial roles in their persistence along such gradients. Studies of the fine-scaled niche are, however, very rare; most studies involve broad-scale variations in climatic parameters. The Turban lily, Lilium pomponium L. is endemic to the Maritime and Ligurian Alps, where it occurs across a wide altitudinal gradient. Previous work has shown no link between climatic marginality and geographic range limits on morphological traits and genetic variability; however, possible variations of local topographic and ecological parameters have not yet been examined. The objective of this paper is to characterise local ecological niche conditions of L. pomponium populations in the different bioclimatic zones it occupies along the altitudinal gradient. The species occurs in four main types of microecological niches. One of these niche types, with a high mineral cover, is the most abundant—type 2: it was detected in 39% of sampled quadrats and occurs across the whole bioclimatic gradient. Other niche types are more limited to subsections of the gradient: type 3 (in 19% of sampled quadrats) is restricted to high-altitude sites (>1070 m.a.s.l.) and is characterised by high vegetation and litter cover; type 4 (26%) corresponds to more forested habitats on substrates with low water retention capacities, in more inland zones close to the centre of L. pomponium distribution and across a range of altitudes; and type 1 (16% of quadrat) only occurs in the Mediterranean part of the gradient, close to distribution limits in pockets of soil among large blocks of rocks, mainly found at mid-altitudes. Despite heterogeneity in the spatial locations of niche types, there is no correspondence between ecological gradients and the distribution limits of this species. Knowledge of the fine-scaled ecological conditions that determine niche types is thus essential for conservation management of the habitats of this species and for the exploration of its possible response to ongoing climate change.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 86%

Section: Discussioncontrasting

confidence: 65%

Section: Introductionmentioning

confidence: 89%

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Niche Variation in Endemic Lilium pomponium on a Wide Altitudinal Gradient in the Maritime Alps

Fontaine

Gauthier

Casazza

et al. 2022

Plants

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“…2017); or a lack of correspondence between the limits of a species' distribution and ecological marginality (Casazza et al, 2021).…”

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confidence: 99%

Genetic diversity in a restricted‐dispersal kissing bug: The centre–periphery hypothesis halfway

et al. 2021

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Ecological, climatic and evolutionary processes play important roles determining genetic diversity on a wide geographical scale (Jin et al., 2020). The centre-periphery hypothesis (CPH) proposes that populations near the distribution limit of a species present lower genetic diversity and higher differentiation than populations located in the centre (Eckert et al., 2008). This pattern could be explained because the centre of a species distribution will probably correspond to its optimal habitat, presenting environmental conditions associated with higher absolute fitness, which may be

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Genetic diversity and differentiation of populations of Anthyllis vulneraria along elevational and latitudinal gradients

Daco

Matthies

Hermant

et al. 2022

Ecology and Evolution

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The abundant centre model (ACM) predicts that the suitability of environmental conditions for a species decreases from the centre of its distribution toward its range periphery and, consequently, its populations will become scarcer, smaller and more isolated, resulting in lower genetic diversity and increased differentiation. However, little is known about whether genetic diversity shows similar patterns along elevational and latitudinal gradients with similar changes in important environmental conditions. Using microsatellite markers, we studied the genetic diversity and structure of 20 populations each of Anthyllis vulneraria along elevational gradients in the Alps from the valleys to the elevational limit (2500 m) and along a latitudinal gradient (2500 km) from Central Europe to the range margin in northern Scandinavia. Both types of gradients corresponded to an 11.5°C difference in mean annual temperature. Genetic diversity strongly declined and differentiation increased with latitude in line with the predictions of the ACM. However, as population size did not decline with latitude and genetic diversity was not related to population size in A. vulneraria , this pattern is not likely to be due to less favorable conditions in the North, but due to serial founder effects during the post‐glacial recolonization process. Genetic diversity was not related to elevation, but we found significant isolation by distance along both gradients, although the elevational gradient was shorter by orders of magnitude. Subarctic populations differed genetically from alpine populations indicating that the northern populations did not originate from high elevational Alpine ones. Our results support the notion that postglacial latitudinal colonization over large distances resulted in a larger loss of genetic diversity than elevational range shifts. The lack of genetic diversity in subarctic populations may threaten their long‐term persistence in the face of climate change, whereas alpine populations could benefit from gene flow from low‐elevation populations.

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When ecological marginality is not geographically peripheral: exploring genetic predictions of the centre-periphery hypothesis in the endemic plantLilium pomponium

Cited by 9 publications

References 72 publications

Niche Variation in Endemic Lilium pomponium on a Wide Altitudinal Gradient in the Maritime Alps

Niche Variation in Endemic Lilium pomponium on a Wide Altitudinal Gradient in the Maritime Alps

Genetic diversity in a restricted‐dispersal kissing bug: The centre–periphery hypothesis halfway

Genetic diversity and differentiation of populations of Anthyllis vulneraria along elevational and latitudinal gradients

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