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93 results for “Forest age”
Data from: Scale-dependent variation in nitrogen cycling and soil fungal communities along gradients of forest composition and age in regenerating tropical dry forests
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Data from: Irregular forest structures originating after fire: an opportunity to promote alternatives to even-aged management in boreal forests
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Data from: The impact of even-aged and uneven-aged forest management on regional biodiversity of multiple taxa in European beech forests
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Data from: Age‐dependent habitat relationships of a burned forest specialist emphasise the role of pyrodiversity in fire management
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Data from: Carbon use efficiency of mycorrhizal fungal mycelium increases during the growing season but decreases with forest age across a Pinus sylvestris chronosequence
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Data from: Effects of stand age, richness and density on productivity in subtropical forests in China
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Population asynchrony alone does not explain stability in species rich soil animal assemblages: the stabilising role of forest age on oribatid mite communities
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Legacy forest structure increases bird diversity and abundance in aging young forests
Many studies have demonstrated the importance of early successional forest habitat for breeding bird abundance, composition, and diversity. However, very few studies directly link measures of bird diversity, composition and abundance to measures of forest composition and structure and their dynamic change over early succession. This study examines the relationships between breeding bird community composition and forest structure in regenerating broadleaf forests of southern New England, USA, separating the influences of ecological succession from retained stand structure. We conducted bird point counts and vegetation surveys across a chronosequence of forest stands, that originated between 2 and 24 years previously in shelterwood timber harvests, a silvicultural method of regenerating oak-mixed broadleaf forests. We distinguish between vegetation variables that relate to condition of forest regeneration and those that reflect legacy stand structure. Using principal components analyses we confirmed the distinction between regeneration and legacy vegetation variables. We ran regression analysis to test for relationships between bird community variables, including nesting and foraging functional guild abundances, and vegetation variables. We confirmed these relationships with hierarchical partitioning. Our results demonstrate that regenerating and legacy vegetation correlate with bird community variables across stand phases, and that the strength with which they drive bird community composition changes with forest succession. While measures of regeneration condition explain bird abundance and diversity variables during late initiation, legacy stand structure explains them during stem exclusion. Canopy cover, ground-story diversity, and canopy structure diversity are the most powerful and consistent explanatory variables. Our results suggest that leaving varied legacy stand structure to promote habitat heterogeneity in shelterwood harvests contributes to greater bird community diversity. Interestingly, this is particularly important during the structurally depauperate phase of stem exclusion of young regenerating forests.
Data from: Linkage of plant trait space to successional age and species richness in boreal forest understory vegetation
Determining the changes in within- and between-species functional diversity in plant communities, and their contribution to overall species trait overlap, can enhance efforts at understanding mechanisms of species coexistence. However, little is known about how variation in species functional diversity influences variation in species trait overlap among contrasting environments. Here, we studied the understorey vegetation in a well-characterized 5000-year-old chronosequence involving 30 forested islands that differ greatly in size, soil fertility, and species diversity. Across this chronosequence we expected consistent changes in both within- and between-species functional diversity that would lead to decreasing overall species trait overlap with increasing successional age, species richness, understorey vegetation density and spatial heterogeneity of soil resources. For each island we measured specific leaf area (SLA) of each of ten individuals of each plant species present. Using a variance decomposition method, we partitioned the total community functional diversity of SLA on each island into within- and between-species functional diversity. Further, we estimated overall species trait overlap as the ratio of within-species functional diversity to total functional diversity. Using regression analyses we then explored relationships of within- and between-species functional diversity, and of overall species trait overlap, with several environmental variables across the 30 islands. Consistent with our hypotheses, overall species trait overlap decreased with successional age due to a statistically significant decrease in within-species functional diversity, and decreased with species richness due to a simultaneous decrease in within-species functional diversity and increase in between-species functional diversity. Against our predictions, overall species trait overlap increased in more competitive environments and did not change with increasing spatial heterogeneity of soil N or P. Synthesis: Our study suggests niche packing as a key mechanism for species coexistence in plant communities. Using SLA as an integrator of plant ecological strategy we show that community successional age and species richness are significantly linked to trait space distribution of plant individuals of boreal forest understorey vegetation and therefore to local species coexistence. Our results also suggest that the trait space of dominant and subordinate species may respond differently to local environmental variables.
Figure 3 from: Šerić Jelaska L, Dumbovich V, Kucinic M (2011) Carabid beetle diversity and mean individual biomass in beech forests of various ages. ZooKeys 100: 393-405. https://doi.org/10.3897/zookeys.100.1536
Figure 3 - Proportion of species according to their hibernation strategies (larvae – black columns, adults – white columns) in relation to forest age (years).
Figure 5 from: Riley K, Browne R (2011) Changes in ground beetle diversity and community composition in age structured forests (Coleoptera, Carabidae). ZooKeys 147: 601-621. https://doi.org/10.3897/zookeys.147.2102
Figure 5 - Relative abundance across the forest age gradient for a representative species from each of the indicator classes (see text for definitions of indicator classes).
Figure 4 from: Riley K, Browne R (2011) Changes in ground beetle diversity and community composition in age structured forests (Coleoptera, Carabidae). ZooKeys 147: 601-621. https://doi.org/10.3897/zookeys.147.2102
Figure 4 - Proportions of carabid populations brachypterous and macropterous for five forest age classes. Significant differences occurred for all forest age classes except the zero age class (χ2 < 0.05).
Figure 3 from: Riley K, Browne R (2011) Changes in ground beetle diversity and community composition in age structured forests (Coleoptera, Carabidae). ZooKeys 147: 601-621. https://doi.org/10.3897/zookeys.147.2102
Figure 3 - Results of Non-Metric Multidimensional Scaling (NMDS) analysis for 33 study sites. The analysis was based on the 17 most common carabid beetle species from five forest age classes (0, 10, 50, 85, and 150 years). Each the five polygons represent different forest age classes, as indicated by different symbols.
Figure 2 from: Riley K, Browne R (2011) Changes in ground beetle diversity and community composition in age structured forests (Coleoptera, Carabidae). ZooKeys 147: 601-621. https://doi.org/10.3897/zookeys.147.2102
Figure 2 - Carabid beetle species accumulation curves for five forest age classes. Vertical line indicates species richness of each curve at n = 233 individuals.
Figure 4 from: Šerić Jelaska L, Dumbovich V, Kucinic M (2011) Carabid beetle diversity and mean individual biomass in beech forests of various ages. ZooKeys 100: 393-405. https://doi.org/10.3897/zookeys.100.1536
Figure 4 - Dendrogram of cluster analyses among forest sites using presence/absence carabid beetle data. Two distinct clusters are formed at roughly 30% similarity. Marks 60y 1–3, 80y 1–3 and 150y. 1–3 denote investigated sites placed in the 60-, 80- and 150-year-old forests.
Figure 1 from: Šerić Jelaska L, Dumbovich V, Kucinic M (2011) Carabid beetle diversity and mean individual biomass in beech forests of various ages. ZooKeys 100: 393-405. https://doi.org/10.3897/zookeys.100.1536
Figure 1 - Position of investigated sites labelled according to the age of the forest ("60y 1–3" denote sites 1 to 3 in the 60-year-old forest, "80y 1–3" denote sites 1 to 3 in the 80-year-old forest and "150y 1–3" denote sites 1 to 3 in the 150-year-old forest). Insert: location of Papuk Nature Park in Croatia.
Fig. 2 in Centipede diversity in patches of different development phases in an unevenly-aged beech forest stand in Slovenia
Fig. 2. Average density estimates of some centipede species from different development phases in an unevenlyaged beech stand at Is˘ka (Slovenia), based on soil samples in 2000.
Fig. 1 in Centipede diversity in patches of different development phases in an unevenly-aged beech forest stand in Slovenia
Fig. 1. Dendrogram of similarities among centipede community samples from different forest development phases, sampled in three different periods in 2000 (distances calculated as (1-percentage similarity)).
FIG. 4 in Multi-aged forest fragments in Atlantic France that are surrounded by meadows retain a richer epiphyte lichen flora
FIG. 4. — The significant effect of canopy density on lichen abundance according to the summary of the GLMMs. The GLMM results are presented for the exterior forest at the tree level within the FFs surrounded by meadows, taking into account the larger tree category (details as in Fig. 2).
Data from: Forest age is a primary trait filter for saproxylic beetles in the southeastern United States
<p>Data from: Forest age is a primary trait filter for saproxylic beetles in the southeastern United States</p> <p>Clayton R. Traylor, Michael D. Ulyshen, Joseph V. McHugh, Ryan C. Burner</p> <p>Forest Ecology and Management 553: 121545. </p> <p><a title="Persistent link using digital object identifier" href="https://doi.org/10.1016/j.foreco.2023.121545" target="_blank" rel="noreferrer noopener"><span>https://doi.org/10.1016/j.foreco.2023.121545</span></a> </p> <p> </p> <p>Corresponding author: Clayton R. Traylor, <a href="mailto:clayton.r.traylor@gmail.com">clayton.r.traylor@gmail.com</a></p> <p> </p> <p> </p> <p><strong>Abstract</strong></p> <p>Many forests throughout the world consist of regenerating mature stands. Although these forests differ in many respects from old-growth (with a history of minimal human disturbance), they typically develop similar structural attributes over time. As a result, older mature forests may be of particular conservation value if they contain resources and microhabitats benefitting saproxylic (deadwood dependent) species. Species' response to forest age may be driven by traits that relate to ecological functions or habitat preferences, such that species with less compatible traits for a local forest environment are "filtered" out. Thus, forest age may influence species' distributions and the trait composition of assembled communities. </p> <p>The Piedmont region of the southeastern United States has experienced widespread forest regrowth over the past century due to agricultural abandonment. Today's landscapes are largely characterized by mature forests that are becoming increasingly fragmented by suburbanization. Here, we assessed the filtering effects of forest age, landscape forest cover (LFC), and deadwood volume on saproxylic beetles in northeastern Georgia. Using historic aerial imagery to distinguish forest age (young = regrown after 1938; old = mature in 1938), we sampled beetles in mature forests of both age classes occurring along an LFC gradient. We measured five traits with hypothesized functional roles (body length, body width, body roundness, antenna length, eye length) for the 472 species captured. Using a joint species distribution model (JSDM), we tested trait-niche relationships (i.e., how traits influence species' responses) and estimated community trait composition (mean and dispersion of trait values) along gradients of environmental filters.</p> <p>We found that forest age is a filter for several traits (six supported relationships with >95% posterior probability), but LFC and deadwood volume were less strongly related to fewer traits. Most notably, large species (typically having lower population sizes and requiring stable larval habitat) were filtered from young mature forests and low LFC. Thus, old mature forests with high LFC showed higher mean and dispersion of beetle body length. Sensory traits also showed responses, likely reflecting adult life under bark (eye length) or ability to detect resources or mates (antenna length). Body width and roundness showed inconsistent responses with regard to indicated functional roles. Our results show that forest age is a strong filter on saproxylic beetle communities in the southeastern United States. Old mature forests, despite their scarcity in the region, are important for species requiring habitat stability and for maintaining communities with diverse trait composition.</p> <p> </p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.