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7 results for “canopy herbivory”
canopy herbivory and leaf traits of tree communities in tropical montane rainforests of southern Ecuador
This dataset contains herbivory data estimated as leaf area loss [cm²] and [%] and several leaf traits measured either conventionally or via spectral sensing-based techniques from canopies of tree communities in tropical montane rainforests of the Andes in southern Ecuador between February and March in 2019. The data were used by Schön et al. (in prep) to evaluate whether leaf traits are valuable indicators of canopy herbivory mainly caused by arthropods and further, whether chemical leaf traits estimated via spectral sensing-based techniques have similar strong relations to herbivory as leaf traits measured conventionally. Herbivory was estimated with the software WinFOLIA ™ 2019a from scanned mature and sun-exposed leaves of tree canopies. Spectral sensing-based leaf traits comprising secondary plant metabolites and both structural and nutritional cell components were estimated from leaves with an OceanOptics spectrometer HDX. Conventionally measured leaf traits comprising morphological and nutritional traits were derived by applying both elemental and morphometrical analyses (e.g., ICP analysis, a digital micrometer and penetrometer). For detailed descriptions of the methodology see Schön et al. (in prep), Homeier et al. (2021), and Limberger et al. (2021). Research was conducted by the subprojects A1, B1, and B4 within the framework of the RESPECT project (Environmental changes in biodiversity hotspot ecosystems of South Ecuador: RESPonse and feedback effECTs) funded by the DFG with the grant numbers: BE1780/51-1, BE1780/51-2, Ho3296/6-1, FA 925/11-1, FA 925/11-2, FA 925/16-1, BR1293/17-1.
Low-intensity insect herbivory could have large effects on ecosystem productivity through reduced canopy photosynthesis. R code and data.
<p>R code and data to reproduce analysis in the publication: Visakorpi K., Gripenberg S., Malhi Y. and Riutta T. Low-intensity insect herbivory could have large effects on ecosystem productivity through reduced canopy photosynthesis. Web Ecology, 2024.</p> <p> </p> <p>File named "Visakorpietal2024_litteratureSurvey.csv" contains data collected from literature survey and to perform a meta-analysis. The columns contain the following data:</p> <p>Reference = unique identifier for each study</p> <p>group_id = if a study described several experiments or treatments, this column identifies them from each other.</p> <p>Plant_species = name of the plant species studied</p> <p>Herbivore_species = name of the herbivore species studies</p> <p>Plant_species_phylo and Plant_species_phylo2 = alternative ways to write the plant species name for phylogenetic analysis</p> <p>Plant_clade = Angiosperm or Gymnosperm</p> <p>Growth_form = seedling, sapling or tree</p> <p>Herbivore_order = phylogenetic order of the herbivore species</p> <p>Herbivore_family = phylogenetic family of the herbivore species</p> <p>Type_of_herbivory = chewing, sap-sucking, root-feeding, leafmining or bark-feeding</p> <p>Leaf_type = whether the leaf that was measured was damaged by herbivores, or intact</p> <p>Manipulation = whether herbivores were added (A) or removed (R)</p> <p>Year_published = year when the study was published</p> <p>PN_herb, SD_herb, se_herb, n_herb = photosynthetic rate, standard deviation, standard error, and sample size, of the treatment group (i.e. experiencing herbivory)</p> <p>PN_intact, SD_intact, se_intact, n_intact = photosynthetic rate, standard deviation, standard error, and sample size, of the control group (i.e. not experiencing herbivory)</p> <p>Indirect_effect, SD_indirect = the proportional difference in photosynthetic rates between the treatment and control values, and the standard deviation of the proportional difference</p>
Canopy height, rather than neighborhood effects, shapes leaf herbivory in a tropical rainforest
<p>These files contain the datasets and R codes used in the data analyses in the paper " Canopy height, rather than neighborhood effects, shapes leaf herbivory in a tropical rainforest " that will be published in Ecology.</p>
Data from: Ontogenetic responses of four plant species to additive and interactive effects of land-use history, canopy structure and herbivory
The strength of interactions among species is often highly variable in space and time, and a major challenge in understanding context-dependent effects of herbivores lies in disentangling habitat-mediated from herbivore-mediated effects on plant performance. We conducted a landscape-scale experiment that manipulated light availability in woodlands with either a history of agricultural use or no history of agricultural use and coupled this with performance measurements of three life stages on four perennial herbaceous species exposed to varying levels of herbivory. We found that the context-dependent effects of herbivory on plant performance changed as plants grew: juvenile plant survival was reduced by herbivores in low-light habitats whereas biomass of adult plants was reduced by a more diverse insect fauna in high-light environments. A history of agricultural land use also had negative effects on seedling establishment and adult performance, independent of herbivory. Synthesis. This work experimentally separates the habitat-mediated effects on plant performance from the herbivore-mediated effects on plant performance and highlights how context-dependent interactions depend on plant ontogenetic stages.
Data for: The long-term impacts of deer herbivory in determining temperate forest stand and canopy structural complexity
<p>1. Ungulates place immense consumptive pressure on forest vegetation globally, leaving legacies of reduced biodiversity and simplified vegetative structure. However, what remains unresolved is whether browse-induced changes occurring early in succession ultimately manifest themselves in the developed forest canopy. Understanding the development and persistence of these legacies is critical as canopy structure is an important determinant of forest ecosystem functions like carbon sequestration and wildlife habitat.</p> <p>2. We measured how white-tailed deer (Odocoileus virginianus) browse during stand initiation affected canopy structure, tree species richness, diversity, stem density, and basal area on Pennsylvania's Allegheny Plateau using a portable canopy LiDAR system. We capitalized on an historic deer enclosure experiment where forests were subjected to four deer densities (4, 8, 15, and 25 deer/km2) for ten years following stand initiation.</p> <p>3. Deer browsing impacts on the forest canopy are apparent nearly four decades since stand initiation. The highest deer density treatment experienced a significant reduction in tree species diversity, density, and basal area with stands becoming dominated by black cherry (Prunus serotina). Reductions in overstory diversity and tree density resulted in a more open canopy with low leaf area and high horizontal leaf variability. Canopies were tallest at the lowest and highest deer densities.</p> <p><i>4. Synthesis and Applications</i>: Using a portable canopy LiDAR system and a former deer enclosure experiment, we show that high deer browsing pressure during stand initiation can have a decades-long impact on stand and canopy structure. High deer densities led to stands with lower species diversity and tree density, which resulted in canopies that were taller and less dense. Managers should consider the lasting legacy of ungulate herbivory on canopy structure, as canopy structure influences several important management goals, such as forest carbon sequestration, maintenance of diverse understory communities, and creation of wildlife habitat.</p>
Data from: Ontogenetic responses of four plant species to additive and interactive effects of land-use history, canopy structure and herbivory
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Data for: The long-term impacts of deer herbivory in determining temperate forest stand and canopy structural complexity
Open the record for dataset details and reuse information.
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