Mapping functional diversity of canopy physiological traits using UAS imaging spectroscopy

Remote Sensing of Environment, Journal Year: 2024, Volume and Issue: 302, P. 113958 - 113958

Published: Jan. 5, 2024

Plant functional diversity (FD) is a component of biodiversity linking plant traits to ecosystem processes (e.g., photosynthesis) and services gross primary production). Development remote sensing capabilities monitor forest FD across various spatio-temporal scales critical, especially in view increasing global climate anthropogenic pressures. Here, we focus on investigating the capability unoccupied aerial systems (UAS), acquiring imaging spectroscopy data high spatial (pixel size ≤0.1 m) spectral (band-width < 5 nm between 400 1000 nm) resolutions, map two trait-based metrics, namely, richness divergence, open sclerophyll forests at plot-scale (<0.2 km2). An emerging scalable kernel-based trait probability density (TPD) approach was implemented compute spatially explicit metrics different areal extents pixel sizes through resampled products. Narrow-band indices were utilized as proxies selected traits, including photoprotective zeaxanthin-to-antheraxanthin transformation ratio (VAZ), foliar pigments chlorophylls anthocyanins (Cab Cant). The combination high-resolution imagery TPDs presents suitable alternative traditional need for taxonomic information alleviates pixel-based mixing issues known affect metrics. A moving kernel (6 × 6 applied UAS data, allowed capture fine medium-scale drivers within-crown complex branching variance, topography, sun aspect, speciation. For same size, computed from coarsened pseudo-airborne products 2 found be 57–68% that derived Functional divergence did not portray substantial differences even though this metric further emphasized complexity surveyed open-forest sites. have potential become an efficient tool monitoring linked with key sites, validation support large-scale but less detailed airborne satellite Finally, study highlights sensitivity variations scale, resolution, TPD parametrization suggesting more research needed standardize protocols quantification temporal scales.

Language: Английский

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Plant spectral diversity from high‐resolution multispectral imagery detects functional diversity patterns in coastal dune communities

Journal of Vegetation Science, Journal Year: 2024, Volume and Issue: 35(2)

Published: March 1, 2024

Abstract Question Remote sensing is a fundamental tool to monitor biodiversity and spectral diversity may represent proxy for different facets such as taxonomic (TD) functional (FD). We used fine‐resolution multispectral imagery explore (SD) patterns across spatial scales (i.e., plot, transect, area), assess SD relationships with TD FD along an environmental gradient. Location Coastal sand dune, Viareggio, Italy (“Migliarino–San Rossore–Massaciuccoli” Regional Park, 43°83′ N, 10°25′ E). Methods measured species richness, while were computed using probability density functions based on pixel position in multivariate spaces. compared space occupation, we tested whether these are coordinated the sea–inland also assessed univariate between facets, how partitioned scales. Results found strong correspondence occupation gradient, lack of significance when considering TD. However, showed higher variation at broader scale most occurred plot level. Conclusion By measuring common methodological framework, demonstrate that approximates plant communities. Moreover, show retrieved high‐resolution images can capture aspects FD, analogous space.

Language: Английский

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The cryptic impacts of invasion: functional homogenization of tropical ant communities by invasive fire ants

Oikos, Journal Year: 2019, Volume and Issue: 129(4), P. 585 - 597

Published: Dec. 24, 2019

The diversity and distribution of traits in an ecological community shapes its responses to change the ecosystem processes it modulates. This ‘functional diversity’, however, is not necessarily a direct outcome taxonomic diversity. Invasions by exotic insects occur ecosystems worldwide, but there limited understanding how they impact functional We present first comprehensive trait‐based investigation impacts ant invasion, incorporating intraspecific polymorphisms species‐level fire Solenopsis invicta invasive species with global distribution. Focusing on invaded uninvaded plots tropical grasslands Hong Kong, we investigated presence S. affects within across communities, identities functionally unique species. Using trait probability density functions, built spaces for 29 different species, scaled up these components calculate at landscape levels. found that invasion had effects richness pronounced composition. Specifically, communities fewer functionally‐unique individuals, were characterized narrower heads bodies shorter mandibles. Moreover, showed substantially higher levels redundancy (+56%) due clustering values. Consequently, landscape, displayed 23% less turnover than despite showing comparable – result confirming theoretical predictions high local redundancy. In sum, alters properties multiple selectively, resulting homogenization landscape. disparities between highlight need consider scales biodiversity change.

Language: Английский

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Contrasting functional structure of saproxylic beetle assemblages associated to different microhabitats

Scientific Reports, Journal Year: 2020, Volume and Issue: 10(1)

Published: Jan. 30, 2020

Abstract Saproxylic beetles depend on diverse microhabitats that are exploited by different species assemblages. We focused analysing the functional trait patterns and diversity components of two main assemblages were collected with window traps (WTs) hollow emergence (HETs) respectively, between three protected areas Iberian Peninsula. For we measured phenological, physiological, morphological, ecological traits. Results showed each assemblage (WT HET) constrain most morphological traits trophic guilds. In addition, relative elytra length predator guild, together adult activity period, responded to differences at habitat level (among study areas). HET less taxonomically but more functionally than those WTs, enhancing relevance tree hollows. Additionally, niche filtering dominated WT assemblages, which characterised a narrower space higher redundancy. contrast, in coexistence dissimilar is driven heterogeneity. differed occupied within areas, both reflected coincident among pointed reduction management.

Language: Английский

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Intensification of açaí palm management largely impoverishes tree assemblages in the Amazon estuarine forest

Biological Conservation, Journal Year: 2021, Volume and Issue: 261, P. 109251 - 109251

Published: July 20, 2021

Language: Английский

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