Frequency of Buddleja davidii Franch. (Buddlejaceae) in Germany along ecological gradients

Wittig, Rüdiger

doi:10.1016/j.flora.2011.09.001

“…These belonged to 34 plant families, included 33 alien species and represented a range of life histories. Despite having generally wide ecological niches, many ruderal plant species (including aliens) are climatically limited (Hügin, 1995;Wittig, 2012), though at sites remote from human settlements it may be difficult to distinguish between limitation due to climate and due to habitat availability (Hügin, 1995). Most of these species disperse readily along transport corridors such as roadsides and railway tracks, either naturally or are directly transported by humans, and their distribution is therefore likely to track fluctuating climate conditions more closely than species restricted to more fragmented, natural habitats (Coffin, 2007;Holderegger & Di Giulio, 2010).…”

Section: Species Selection and Data Collectionmentioning

confidence: 99%

“…Most of these species disperse readily along transport corridors such as roadsides and railway tracks, either naturally or are directly transported by humans, and their distribution is therefore likely to track fluctuating climate conditions more closely than species restricted to more fragmented, natural habitats (Coffin, 2007;Holderegger & Di Giulio, 2010). Despite having generally wide ecological niches, many ruderal plant species (including aliens) are climatically limited (Hügin, 1995;Wittig, 2012), though at sites remote from human settlements it may be difficult to distinguish between limitation due to climate and due to habitat availability (Hügin, 1995). To reduce the risk of errors introduced by false absences, we selected species that have a long flowering period; and to reduce the risk of misidentification, we included only three easily recognizable grass species (Dactylis glomerata, Bromus inermis, Briza media).…”

Section: Species Selection and Data Collectionmentioning

confidence: 99%

How comparable are species distributions along elevational and latitudinal climate gradients?

Halbritter

¹

,

Alexander

²

,

Edwards

³

et al. 2013

Global Ecology and Biogeography

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Aim Because climatic factors, especially temperature, show similar trends with elevation and latitude, it is often assumed that elevational gradients can be used as a proxy for understanding ecological processes along latitudinal gradients. We investigated the validity of this assumption for herbaceous plants, testing the hypotheses that (1) species reach the same climate limits, and (2) exhibit similar distribution patterns along both types of gradient. Location Swiss Alps and Scandinavia. Methods We recorded the occurrence of 155 ruderal plant species along an elevational gradient in the Swiss Alps and a latitudinal gradient, both reaching beyond the distribution limit of most species. Principal components analysis was used to summarize climatic variation in temperature and precipitation across these gradients and assessed the relationship across species between climatic limits along the two gradients. We used logistic regressions to compare how the probability of occurrence of individual species changed with climate along the two gradients. Results We found no correlation of species principal components analysis (PCA) values (climate limit) along an elevational and latitudinal precipitation gradient (PC1) but a positive correlation along a temperature gradient (PC2). Species reached a colder climate limit (on average 244 growing degree days lower) and decreased in occurrence more gradually along the elevational compared to the latitudinal gradient. Main conclusions We suggest that the differences in distribution patterns and limits along similar climatic gradients are mainly due to the much shorter dispersal distances along elevational than latitudinal gradients, although other explanations are also possible. We can therefore expect plants in mountains and lowland regions to respond differently to rapid climate change, and so caution must be exercised when using elevation as a proxy for latitude in studies of species distribution. Nonetheless, comparative studies along such gradients can yield important insights into the factors that limit species distributions.

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“…sides of roads and on riverbanks), which is typical of pioneer plants [18][19][20] , and some species (e.g. B. davidii) can become invasive if introduced to new environments [21][22][23] . Due to substantial overlaps in distribution and owering periods, as well as shared pollinators, interspeci c hybridization is assumed to be relatively common in the genus [14][15]18] .…”

Section: Introductionmentioning

confidence: 99%

Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation   

Liao

¹

,

Sun

²

,

Ma

³

2020

Preprint

0

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Background: F1 hybrids acting as a bridgehead for producing later generation hybrids can have evolutionary significance through strengthening reproductive isolation or facilitating gene flow between parental species, depending on whether backcrossing can occur. It had been suggested that the Tibetan plant Buddleja wardii was a hybrid species between B. alternifolia and B. crispa based on their sympatric distributions and the morphological characters in last century. Till now however, we still have limited evidence to prove key issues to B. wardii, like if it is of hybrid origin indeed and whether it is currently a true hybrid species already.Results: In the present study, two sympatric populations of these three taxa were examined and compared using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sites B. × wardii was likely to be a hybrids between B. alternifolia and B. crispa, and moreover, most of the hybrids present were confirmed to be F1s. This was further supported by morphology as no transgressive characters were detected. B. crispa was found to be the maternal parent in one population (BH), while in the second population (TJ), it was difficult to distinguish the hybridization direction due to shared haplotypes of cpDNA between B. alternifolia and B. crispa. Conclusions: These results provide evidence that the natural hybrids between B. alternifolia and B. crispa mainly comprise F1 hybrids, which have subsequently been given the name B. wardii. The F1 hybrids have also contributed to strong reproductive isolation between parental species.

show abstract

“…davidii) can become invasive if introduced to new environments [21][22][23] . Due to substantial overlaps in distribution and owering periods, as well as shared pollinators, interspeci c hybridization is assumed to be relatively common in the genus [14][15]18] .…”

mentioning

confidence: 99%

Natural Hybridization between Two Butterfly Bushes in Tibet: Dominance of F1 Hybrids Promotes Strong Reproductive Isolation

Liao

¹

,

Sun²,

Ma

³

2020

Preprint

0

View full text Add to dashboard Cite

Background: F1 hybrids acting as a bridgehead for producing later generation hybrids can have evolutionary significance through strengthening reproductive isolation or facilitating gene flow between parental species, depending on whether backcrossing can occur. It had been suggested that the Tibetan plant Buddleja wardii was a hybrid species between B. alternifolia and B. crispa based on their sympatric distributions and the morphological characters in last century. Till now however, we still have limited evidence to prove key issues to B. wardii, like if it is of hybrid origin indeed and whether it is currently a true hybrid species already.Results: In the present study, two sympatric populations of these three taxa were examined and compared using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sites B. × wardii was likely to be a hybrids between B. alternifolia and B. crispa, and moreover, most of the hybrids present were confirmed to be F1s. This was further supported by morphology as no transgressive characters were detected. B. crispa was found to be the maternal parent in one population (BH), while in the second population (TJ), it was difficult to distinguish the hybridization direction due to shared haplotypes of cpDNA between B. alternifolia and B. crispa. Conclusions: These results provide evidence that the natural hybrids between B. alternifolia and B. crispa mainly comprise F1 hybrids, which have subsequently been given the name B. wardii. The F1 hybrids have also contributed to strong reproductive isolation between parental species.

show abstract

Frequency of Buddleja davidii Franch. (Buddlejaceae) in Germany along ecological gradients

Cited by 11 publications

References 16 publications

How comparable are species distributions along elevational and latitudinal climate gradients?

How comparable are species distributions along elevational and latitudinal climate gradients?

Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation

Natural Hybridization between Two Butterfly Bushes in Tibet: Dominance of F1 Hybrids Promotes Strong Reproductive Isolation

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Frequency of Buddleja davidii Franch. (Buddlejaceae) in Germany along ecological gradients

Cited by 11 publications

References 16 publications

How comparable are species distributions along elevational and latitudinal climate gradients?

How comparable are species distributions along elevational and latitudinal climate gradients?

Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation &nbsp;&nbsp;

Natural Hybridization between Two Butterfly Bushes in Tibet: Dominance of F1 Hybrids Promotes Strong Reproductive Isolation

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Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation