Department of Functional Ecology

Located in Třeboň, South Bohemia

Head: doc. Mgr. Jiří Doležal, Ph.D.

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Research topics

  • Plant life on altitudinal limits in the West Himalayas and the Andes
  • Plant functional traits in species-rich meadows
  • Dendrochronology and growth-climate responses
  • Functional island biogeography
  • Pollination systems

Selected recent results

1/ Alpine plant growth and reproduction dynamics in a warmer world

Climate warming affects the growth and survival of mountain plants. In the Tatras, Rumex alpinus produces rhizomes three times longer and twice as many leaves as 40 years ago. High summer temperature, however, leads to a lack of water in dense vegetation and stronger competition. Our results from the Himalayas suggest that warming‐induced responses in alpine plants will be multidimensional and spatiotemporally variable and will hinge on the physiological tolerance of species to climate change.

Lokalita šťovíku alpskéhoail přírůstků oddenku šťovíku alpského

Illustration of the monodominant sites of Rumex alpinus in the Low Tatras, Slovakia, Central Europe, the belowground rhizome system and measured growth parameters: annual segment length, leaf and inflorescence scars.

  • Doležal J., Kurnotová M., Šťastná P. & Klimešová J. 2020. Alpine plant growth and reproduction dynamics in a warmer world. New Phytologist 228: 1295-1305. doi: 10.1111/nph.16790
  • Liancourt P., Song X., Macek M., Šantrůček J. & Doležal J. 2020. Plant’s-eye view of temperature governs elevational distributions. Global Change Biology 26: 4094-4103. doi: 10.1111/gcb.15129

 

2/ Relationship between stability and diversity of plant communities

Understanding how diversity affects ecosystem stability is crucial for predicting the consequences of continued habitat and biodiversity loss on ecosystem functions and services. Long-term productivity stability in plant communities is often associated with greater species, phylogenetic or functional diversity, more complex size and age structures, or higher asynchrony in species fluctuations (compensatory dynamics), all potentially increasing community resistance to perturbations. However, the relative importance of these stabilizing pathways is still poorly understood. We collected long-term time series of vegetation data across the world, stemming from a variety of biomes and habitats. Results showed that stability, measured as temporal stability of total community abundance, was more strongly associated with the degree of synchrony than with species richness (Valencia et al., 2020a, Valencia et al. 2020b, Dolezal et al. 2020). These results highlight the prevalence of biotic drivers on ecosystem stability, with the potential for additional environmental drivers to alter the intricate relationships among richness, synchrony, and stability. To consider these different drivers of stability in concert is critical for defining the potential of communities to remain stable in a global change context.

Strukturální modelování ukazující přímé a nepřímé účinky více abiotických a biotických faktorů na stabilitu

Piecewise structural equation model showing the direct and indirect effects of multiple abiotic and biotic drivers on the stability across the 79 datasets (Valencia et al. 2020a).

  • Valencia E., de Bello F., Lepš J., Galland T., E-Vojtko A., Conti L., Danihelka J., Dengler J., Eldridge D. J., Estiarte M., García-González R., Garnier E., Gómez D., Harrison S., Herben T., Ibáñez R., Jentsch A., Juergens N., Kertész M., Klumpp K., Louault F., Marrs R. H., Ónodi G., Pakeman R. J., Pärtel M., Peco B., Peñuelas J., Rueda M., Schmidt W., Schmiedel U., Schuetz M., Skálová H., Šmilauer P., Šmilauerová M., Smit C., Song M.-H., Stock M., Val J., Vandvik V., Wesche K., Woodcock B. A., Young T. P., Yu F.-H., Zobel M. & Götzenberger L. 2020. Directional trends in species composition over time can lead to a widespread overemphasis of year-to-year asynchrony. Journal of Vegetation Science 31: 792-802. doi: 10.1111/jvs.12916

  • Valencia E., de Bello F., Galland T., Adler P., Lepš J., E-Vojtko A., van Klink R., Carmona C. P., Danihelka J., Dengler J., Eldridge D. J., Estiarte M., García-González R., Garnier E., Gómez-García D., Harrison S. P., Herben T., Ibáñez R., Jentsch A., Juergens N., Kertész M., Klumpp K., Louault F., Marrs R. H., Ogaya R., Ónodi G., Pakeman R. J., Pardo I., Pärtel M., Peco B., Peñuelas J., Pywell R. F., Rueda M., Schmidt W., Schmiedel U., Schuetz M., Skálová H., Šmilauer P., Šmilauerová M., Smit C., Song M.-H., Stock M., Val J., Vandvik V., Ward D., Wesche K., Wiser S. K., Woodcock B. A., Young T. P., Yu F.-H, Zobel M. & Götzenberger L. 2020. Synchrony matters more than species richness in plant community stability at a global scale. Proceedings of the National Academy of Sciences of The United States of America 117: 24345-24351. doi: 10.1073/pnas.1920405117

  • Doležal J., Fibich P., Altman J., Lepš J., Uemura S., Takahashi K. & Hara H. 2020. Determinants of ecosystem stability in a diverse temperate forest. Oikos 129: 1692-1703.

 

3/ Tree growth responses to global change and advancement of dendrochronological techniques

The determination of long-term spatiotemporal growth responses is essential for understanding forest dynamics and its shifts under global changes. However, the current understanding of the modulation of the impact of climatic change on forest ecosystems by elevational differences and by species interaction is still limited. We analyzed tree-ring-based growth-climate relationships of Quercus mongolica and Abies koreana along an 800-m elevational gradient on Jeju Island, South Korea (Altman et al. 2020). Recent warming has positively affected the growth of oak, while fir growth is reduced by high temperatures.

To standardize methodological approaches for tree-ring-based disturbance reconstruction and hence enable comparison between various studies and regions, Altman (2020) provides a comprehensive review of these techniques. Besides, a methodological guide for interdisciplinary studies is suggested as well as several future challenges.

Lastly, we focused on the precise demarcation between earlywood and latewood (Samusevich et al. 2020). A suggested methodology is universal and can help to calibrate criteria for earlywood-latewood demarcation under specific conditions.

Hlavní vědecké obory s velkým potenciálem pro využití letokruhů jako informace o historii disturbance.
Main research fields with high potential for utilization of growth release detection as a record of past disturbances.

  • Altman J. (2020) Tree-ring-based disturbance reconstruction in interdisciplinary research: Current state and future directions. Dendrochronologia 63: 125733. doi: 10.1016/j.dendro.2020.125733
  • Altman J., Treydte K., Pejcha V., Cerny T., Petrik P., Srutek M., Song J.S., Trouet V. & Dolezal J. (2020) Tree growth response to recent warming of two endemic species in Northeast Asia. Climatic Change 162: 1345-1364. doi: 10.1007/s10584-020-02718-1
  • Samusevicha A., Lexa M., Vejpustková M., Altman J. & Zeidler A. (2020) Comparison of methods for the demarcation between earlywood and latewood in tree rings of Norway spruce. Dendrochronologia 60: 125686. doi: 10.1016/j.dendro.2020.125686

 

4/ Restoration ecology of disturbed sites

We tested the influence of landscape parameters, such as the landscape cover around the target area, and the abiotic environment (macroclimate, substrate) on the development of vegetation during succession. It turned out that although all these factors influence the development of vegetation, abiotic factors have a greater influence. The traditional division into primary and secondary succession had only a small effect on vegetation development (Vítovcová et al. in press). Research into purposefully forested and spontaneously overgrown sand pits has shown that although the course of succession has a similar course in both types of habitats, spontaneously overgrown sand pits are more naturally valuable habitats (Šebelíková et al. 2020). However, for the prevention of degradation of these valuable and species-rich sandy habitats, a regular disturbance is needed (Řehounková et al. in press). The importance of disturbed and spontaneously overgrown areas for biodiversity was also confirmed by the study Řehounková et al. (2020), which showed that 14% of endangered species of the Czech Republic occur in disturbed habitats.

Těžbou narušená krajina v okolí města Sokolov, SZ České republiky
Mining area around the city Sokolov, SW of the Czech Republic.

  • Vítovcová K., Tichý L., Řehounková K. & Prach K. (2020) Which landscape and abiotic site factors influence vegetation succession across seres at a country scale? Journal of Vegetation Science, doi: 10.1111/jvs.12950
  • Řehounková K., Jongepierová I., Šebelíková L., Vítovcová K. & Prach K. (in press) Topsoil removal in degraded open sandy grasslands: can we restore threatened vegetation fast? Restoration Ecology, doi: 10.1111/rec.13188
  • Řehounková K., Vítovcová K. & Prach K. (2020) Threatened vascular plant species in spontaneously revegetated post-mining sites. Restoration Ecology, 28, 679–686. doi: 10.1111/rec.13027