Tree growth-climate relationship in the Azorean holly in a temperate humid forest with low thermal amplitude

Pavão, Diogo C.; Jevšenak, Jernej; Engblom, J.; Silva, L. Borges; Elias, Rui B.; Silva, L.

doi:10.1016/j.dendro.2022.126050

Cited by 8 publications

(7 citation statements)

References 101 publications

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“…However, the relatively low rbar values suggest that the growth of individual trees within each stand was not strongly synchronized. Similar results have also been reported for the Azorean endemic trees Juniperus brevifolia [11] and Ilex azorica [43], a common outcome in regions with low thermal amplitude and low seasonality (e.g., [93][94][95][96]). Stands at Terceira Island showed higher rbar values than most of the sites at São Miguel Island, which suggests that other factors might be affecting or disturbing individual tree growth [27,97,98], including competition due to the presence of invasive plants that are more common in São Miguel natural forests [1,30].…”

Section: Chronology Evaluationsupporting

confidence: 86%

“…Our stepwise approach to RF allowed selecting a range of explanatory climatic variables corresponding to importance values above 20% and providing a reasonable percentage of explained variance comparing to previous studies (e.g., [99][100][101]). The GLM approach was also previously used in other studies from the Azores archipelago (e.g., [14,41,43]). Moreover, although delivering a useful estimation of the direction of the effect, the final GLMs did not show a relevant improvement in terms of model evaluation statistics (AICc and adjusted R 2 ) compared to the climatic variables selected in the second step of RF.…”

Section: Modeling Constraintsmentioning

confidence: 99%

“…Thus, the main objective of the study was to investigate the limiting climatic factors affecting the radial growth of L. azorica. We addressed the following hypotheses: (1) based on a previous study, L. azorica will show distinctive tree-ring boundaries that will allow an accurate climate-growth relationship assessment; (2) the effect of previous year climate variables will be relevant because ringporous broadleaved species are known to build their early wood before the onset of the growing season, from carbohydrates stored from the previous growing season (e.g., [47,48]); and (3) given the high relative humidity and annual precipitation of the archipelago [28,29], temperature will be the main limiting factor that affects tree growth, as previously shown for other Lauraceae species (e.g., [31]) and other studies in the Azores (e.g., [14,43]).…”

Section: Introductionmentioning

confidence: 96%

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Climate–Growth Relationships in Laurus azorica—A Dominant Tree in the Azorean Laurel Forest

Pavão

Jevšenak

Silva

et al. 2023

Forests

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Forests on oceanic islands, such as the Azores archipelago, enable interesting dendroclimatic research, given their pronounced climatic gradients over short geographical distances, despite the less pronounced seasonality. The Lauraceae play an essential ecological role in Macaronesian natural forests. An example is Laurus azorica (Seub.) Franco, a relevant species given its high frequency and physiognomic dominance in Azorean laurel forests. This study aims to quantify climate–growth relationships in L. azorica using a dendroecological approach. We sampled four stands at São Miguel and two stands at Terceira islands, for a total of 206 trees. Following standard dendrochronological methods and rigorous sample selection procedures, we obtained relatively low rbar values and high temporal autocorrelation. Using a stepwise Random Forest analysis followed by Generalized Linear Models calculation, we found prominent effects of present and previous year temperature, but a low precipitation signal on growth rings, with some model variation between stands. Our results agreed with previous observations for broad-leaved species with diffuse porous wood, contributing to increase the baseline dendroecological knowledge about Azorean forests. Due to the high levels of within- and between-stand variation, and to refine the climatic signal analysis, complementary approaches should be explored in the future.

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Section: Chronology Evaluationsupporting

confidence: 86%

Section: Modeling Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Climate–Growth Relationships in Laurus azorica—A Dominant Tree in the Azorean Laurel Forest

Pavão

Jevšenak

Silva

et al. 2023

Forests

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“…For the Azores archipelago, with a temperate climate, I. azorica Gand. is commonly found dominant in natural forests [12].…”

Section: Introductionmentioning

confidence: 99%

“…Intraspecific microevolution, however, has not received sufficient attention yet. The reports on genetic diversity and genetic structure are limited to a few species, such as I. paraguariensis [12,[31][32][33][34], I. guayusa [35], and I. crenata Thunb. [36].…”

Section: Introductionmentioning

confidence: 99%

The Genetic Diversity of Natural Ilex chinensis Sims (Aquifoliaceae) Populations as Revealed by SSR Markers

Hou,

Zhou,

Fang

et al. 2024

Forests

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Ilex chinensis Sims. is an evergreen tree species native to China and mainly distributed in the region south of the Qinling Mountains and the Huai River. This species has important ornamental, medicinal, ecological, and economic values, and plays a positive role in improving the environment and people’s lives. To reveal the genetic diversity and genetic structure of 401 individuals from 14 populations in the major distribution area of I. chinensis, 11 pairs of SSR primers were selected for PCR amplification. The products were then subjected to capillary electrophoresis, and the genetic diversity of Ilex individuals was analyzed using relevant software. The results showed that the genetic diversity of I. chinensis was at a moderate-to-high level. A total of 54 alleles were detected at 11 SSR loci in the 14 Ilex populations, with an average of 4.831 alleles per locus. AMOVA analysis indicated that the genetic variation of I. chinensis populations mainly originated within populations. A STRUCTURE analysis divided the 401 I. chinensis individuals into four different genetic clusters. The unweighted pair group methods using arithmetic averages (UPGMA) clustering based on Nei’s genetic distance revealed that the population from Xinping of Yuxi, Yunnan Province (XP), and the population from Longan of Qianxinan, Guizhou Province (LoA) were located in the outermost layer of the phylogenetic tree, indicating the furthest genetic relationship between these two population and other populations. The remaining populations could be roughly divided into two groups. Principal coordinate analysis (PCoA) demonstrated that the 401 individuals were clearly divided into three groups, which was consistent with the results of the STRUCTURE analysis and UPGMA clustering. This study identified the hotspots of genetic diversity of I. chinensis, as well as units for the conservation of individuals. It also revealed the patterns of genetic variation and population distribution of I. chinensis in different regions, providing a molecular basis for the geographical zoning and formulation of breeding programs for I. chinensis, as well as germplasm resource management.

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Growth-climate relationships of four tree species in the subtropical evergreen broad-leaved forests in Southwest China

Xu,

Yang,

Zaw

et al. 2024

Dendrochronologia

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Tree growth-climate relationship in the Azorean holly in a temperate humid forest with low thermal amplitude

Cited by 8 publications

References 101 publications

Climate–Growth Relationships in Laurus azorica—A Dominant Tree in the Azorean Laurel Forest

Climate–Growth Relationships in Laurus azorica—A Dominant Tree in the Azorean Laurel Forest

The Genetic Diversity of Natural Ilex chinensis Sims (Aquifoliaceae) Populations as Revealed by SSR Markers

Growth-climate relationships of four tree species in the subtropical evergreen broad-leaved forests in Southwest China

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