Host tree traits in pasture areas affect forest and pasture specialist epiphyte species differently

Elias, João Pedro Costa; Mortara, Sara Ribeiro; Nunes-Freitas, André Felippe; Berg, Eduardo van den; Ramos, Flávio Nunes

doi:10.1002/ajb2.1634

Cited by 11 publications

(8 citation statements)

References 73 publications

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“…We observed a significant phylogenetic relationship of host tree species with the metabolic constitution of R. complanata independent of geographic origin. It has been described before that different host trees possess specific bark chemistry with unique conditions, such as bark pH or the elemental (C, N, P, Mg, Ca, …) content per bark dry mass filter for specific epiphytic communities [ 34 , 35 ]. While R. complanata has been found to be not very selective regarding its substrate ( R. complanata can grow on many types of bark, mainly of deciduous trees, but also on rocks and even on bare soil), these unspecific and rather wide requirements are mirrored by its metabolome, which is regulated depending on the conditions of the host substrate.…”

Section: Discussionmentioning

confidence: 99%

Host Tree and Geography Induce Metabolic Shifts in the Epiphytic Liverwort Radula complanata

Blatt-Janmaat

Neumann

Ziegler

et al. 2023

Plants

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Bryophytes are prolific producers of unique, specialized metabolites that are not found in other plants. As many of these unique natural products are potentially interesting, for example, pharmacological use, variations in the production regarding ecological or environmental conditions have not often been investigated. Here, we investigate metabolic shifts in the epiphytic Radula complanata L. (Dumort) with regard to different environmental conditions and the type of phorophyte (host tree). Plant material was harvested from three different locations in Sweden, Germany, and Canada and subjected to untargeted liquid chromatography high-resolution mass-spectrometry (UPLC/ESI-QTOF-MS) and data-dependent acquisition (DDA-MS). Using multivariate statistics, variable selection methods, in silico compound identification, and compound classification, a large amount of variation (39%) in the metabolite profiles was attributed to the type of host tree and 25% to differences in environmental conditions. We identified 55 compounds to vary significantly depending on the host tree (36 on the family level) and 23 compounds to characterize R. complanata in different environments. Taken together, we found metabolic shifts mainly in primary metabolites that were associated with the drought response to different humidity levels. The metabolic shifts were highly specific to the host tree, including mostly specialized metabolites suggesting high levels of ecological interaction. As R. complanata is a widely distributed generalist species, we found it to flexibly adapt its metabolome according to different conditions. We found metabolic composition to also mirror the constitution of the habitat, which makes it interesting for conservation measures.

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Section: Discussionmentioning

confidence: 99%

Host Tree and Geography Induce Metabolic Shifts in the Epiphytic Liverwort Radula complanata

Blatt-Janmaat

Neumann

Ziegler

et al. 2023

Plants

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“…However, in the present study, the populations of R. granadensis colonizing isolated fruit or shade trees within a transformed pasture matrix had a higher density of plants per phorophyte compared with the forest sub-sites (Supplement Table 1). This may be partly explained as isolated trees in open pastures tend to grow larger and wider crowns (Elias et al, 2021). In Andean human-transformed landscape, Köster et al (2011) found that tree traits explain 60% of the epiphytic community composition in an Ecuadorian cloud forest, where the isolated trees act as steppingstones that permit some persistence of epiphytes outside of the forest in a changing landscape mosaic (Köster et al, 2009;Elias et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

The effect of habitat transformation on a twig epiphytic orchid: Evidence from population dynamics

Ospina-Calderón

Tremblay²,

Torres³

et al. 2023

Front. Ecol. Evol.

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The tropical Andean landscape has been dramatically transformed over the last century with remaining native forest limited to small fragments within a heterogeneous matrix of crops, cattle pastures, and urban environments. We aimed to explore the impact of habitat transformation on the population dynamics in an endemic twig epiphytic orchid located within the undisturbed forest and within modified matrix habitat in two regions with contrasting landscape structures: with a dominant shade coffee matrix and a dominant grassland matrix. Over 2 years, we surveyed 4,650 individuals of the Colombian endemic orchid, Rodriguezia granadensis. We undertook four post-breeding censuses in three sites in each region in both native forest and pasture sub-sites (12 sub-sites; 48 censuses in total), and constructed demographic transition matrices (n = 36). The transition probabilities were calculated using a Bayesian approach and population grow rates were evaluated using asymptotic models and elasticities using transient dynamics. Between regions, higher population growth rate and inertia (defined as the largest or smallest long-term population density with the same initial density distribution) was seen in the shade coffee-dominated landscape. Additionally, population growth rate and damping ratio was higher in forest compared with pasture, with lower convergence time for the forest subsites. These demographic patterns reveal the contrasting levels of population resilience of this orchid in different landscape structures with the more connected shade-coffee dominated landscape permitting some healthier populations with greater population growth and survival in forest than pasture. This study highlights that twig epiphyte colonization of isolated phorophytes in pastures should not be interpreted as a sign of a healthy population but as a temporal transitory period.

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“…For the epiphytes, tree height has been one of the key predictive variables of epiphyte richness in a local context (Flores-Palacios and García-Franco, 2006;Krömer et al, 2007). Taller trees often harbor a higher richness, biomass and abundance of epiphytes, compared to smaller trees (Flores-Palacios and García-Franco, 2006;Elias et al, 2021;Mitchell et al, 2021). The stratification of epiphytes along the vertical profile of trees has thus been the focus of several scientific studies in the past (see Johansson, 1974 andZotz, 2007).…”

Section: Discussionmentioning

confidence: 99%

Quantification and Variation of Microclimatic Variables Within Tree Canopies - Considerations for Epiphyte Research

Murakami

Ramos

Durand

et al. 2022

Front. For. Glob. Change

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Forest canopies are incredibly complex self-maintaining biological structures. Conditions above and within the canopy can differ vastly, often resulting in a vertical gradient of microclimate conditions. Canopy epiphytic plants have to deal with climatic variability on much more variable scales compared to many other plant groups. The difficulty of sensor installation and their high cost can explain why it has been ignored in many studies on canopy epiphytes. Direct measurements of microenvironmental conditions are the only accurate way to assess specific intra-canopy environmental conditions, as there is also still a lack of methodologically and financially viable alternatives to allow the collection of this type of data. This study aims to make recommendations for the direct use of microclimate measurements in epiphyte research and to summarize key discussion points concerning the number and placement of sensors required for different types of epiphyte studies. In addition, we presented high-resolution field data from the United Kingdom, where we employed over 56 microclimate sensors, to demonstrate the spatial and temporal variability of radiation, temperature, and relative humidity (RH) in a tree canopy. Our data demonstrated that sensor height in the tree and leaf-set were the most important factors determining microclimate variability in the canopy. For the first time, we have made recommendations regarding the placement and number of sensors required in studies that specifically require the use of microclimate sensors in epiphyte studies in forest canopies.

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Host tree traits in pasture areas affect forest and pasture specialist epiphyte species differently

Cited by 11 publications

References 73 publications

Host Tree and Geography Induce Metabolic Shifts in the Epiphytic Liverwort Radula complanata

Host Tree and Geography Induce Metabolic Shifts in the Epiphytic Liverwort Radula complanata

The effect of habitat transformation on a twig epiphytic orchid: Evidence from population dynamics

Quantification and Variation of Microclimatic Variables Within Tree Canopies - Considerations for Epiphyte Research

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