scholarly journals Landscape scale terrestrial factors are also vital in shaping Odonata diversity of watercourses

2019 ◽  
Author(s):  
H. Beáta Nagy ◽  
Zoltán László ◽  
Flóra Szabó ◽  
Lilla Szőcs ◽  
György Dévai ◽  
...  
Keyword(s):  
Patch Size ◽  
Landscape Scale ◽  
Farm Management ◽  
Relative Importance ◽  
Population Abundance ◽  
Forest Patch ◽  
Terrestrial Environment ◽  
Landscape Variables ◽  
Insect Populations ◽  
Landscape Scales

ABSTRACTHabitat loss and fragmentation causes decline of insect populations. Odonata (both dragonflies and damselflies) are especially threatened, because they are notably influenced by both aquatic and terrestrial environment. We explored the relative importance of local and landscape variables for Odonata assemblages (species richness, assemblage composition, population abundance) revealing differences in the sensitivity of Zygoptera and Anisoptera on the selected variables. Our study took two years and was placed along 11 lowland watercourses. We sampled the specimens using 500 m long transects from May to September. Landscape variables (length of watercourses, forest patch proportion, and farmland patch size) were calculated at three scales to better account for fragmentation. Our findings show that local variables influence damselflies, but dragonflies are more sensitive to landscape variables. Damselfly’s diversity decreased with the increasing macrovegetation cover, while dragonfly’s diversity decreased with the increasing degree of land use intensification, but increased with the length of watercourses. Our findings, both on local and landscape scales demonstrated the importance of terrestrial environment on Odonata. Based on our findings we stress the importance of partial watercourse clearing, and maintenance of traditional farm management based on small parcel farming near watercourses to maintain diverse and healthy Odonata assemblages.

scholarly journals Landscape-scale terrestrial factors are also vital in shaping Odonata assemblages of watercourses

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
H. Beáta Nagy ◽  
Zoltán László ◽  
Flóra Szabó ◽  
Lilla Szőcs ◽  
György Dévai ◽  
...  
Keyword(s):  
Habitat Heterogeneity ◽  
Large Scale ◽  
Patch Size ◽  
Landscape Scale ◽  
Farm Management ◽  
Forest Patch ◽  
Terrestrial Environment ◽  
East European ◽  
Insect Populations ◽  
Landscape Scales

AbstractHabitat loss and fragmentation causes a decline in insect populations. Odonata (both dragonflies and damselflies) are especially threatened by the destruction of both aquatic and terrestrial environment. Moreover, effects of large-scale habitat heterogeneity on Odonata assemblages are poorly studied. In a two years study along East-European lowland watercourses both aquatic and terrestrial environment were studied to reveal the importance of local (e.g. water depth, macrovegetation cover, etc.) and landscape-scale (e.g. farmland patch size, forest patch proportion, etc.) variables to Odonata (as well as to dragonflies and damselflies separately) through increasing spatial sampling scales. The specimens were sampled using 500 m long transects from May to September. Results, both on local and landscape scales emphasized the importance of terrestrial environment on Odonata. Local variables influence damselflies, while dragonflies are more sensitive to landscape variables. Damselfly’s diversity decreased with increasing macrovegetation cover, while dragonfly’s diversity decreased with the increasing degree of land use intensification, but increased with the length of watercourses. It is thus vital to stress the importance of partial watercourse clearing, and moderate maintenance of traditional farm management based on small parcel farming near watercourses to maintain diverse and healthy Odonata assemblages.

The effects of forest patch size and matrix type on changes in carabid beetle assemblages in an urbanized landscape

2008 ◽  
Vol 141 (10) ◽  
pp. 2585-2596 ◽  
Author(s):  
Eva Gaublomme ◽  
Frederik Hendrickx ◽  
Hilde Dhuyvetter ◽  
Konjev Desender
Keyword(s):  
Patch Size ◽  
Carabid Beetle ◽  
Forest Patch ◽  
Matrix Type ◽  
Beetle Assemblages

scholarly journals KEANEKARAGAMAN JENIS DAN KELIMPAHAN POPULASI SERANGGA AIR SEBAGAI INDIKATOR BIOLOGIS CEMARAN AIR PADA DAS DI LANGOWAN

EUGENIA ◽  
2011 ◽  
Vol 17 (2) ◽  
Author(s):  
Redsway T.D. Maramis ◽  
Henny V.G. Makal
Keyword(s):  
Aquatic Insects ◽  
Water Contamination ◽  
Diversity Index ◽  
Aquatic Insect ◽  
Biotic Index ◽  
Population Abundance ◽  
Key Word ◽  
Species Population ◽  
Insect Populations ◽  
Insect Resistant

ABSTRACT   Aquatic insects are one of the organisms that are used in determining water contamination. Aquatic insects are sensitive to the presence of waste dumped in the river and some are resistant to such waste. One of insect resistant waste is Chironomidae. The research objective was to determine aquatic insect species, population abundance by calculating indices diversity and biotic index. Aquatic insects in the lake watershed Tondano were collected by kicks and Hand Picking. Result showed that seven orders, theerteen families and sixteen species had been identified. The number of highest aquatic insect was found in Noogan which were 13 species, whereas in karondoran were 9 species. Aquatic insects were identified including, Heptagenia sp, sp Baetis sp, Caenis sp., Hydropsyhe, sp and Chrironomidae. The highest aquatic insect populations were collected in Karondoran followed by Winebetan and Noogan. The highest diversity index of aquatic insects was found in Winebetan whereas the lowest was in Karondoran. The lowest value of the biotic index was identified in the region Noogan suggested that water in Noogan area was clean water compared to Winebetan and Karondoran. Key word: Types and aquatic insect populations

scholarly journals Habitat and Landscape Suitability as Indicators of Bird Abundance in Created and Restored Wetlands

ISRN Ecology ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Jordan W. Mora ◽  
John N. Mager III ◽  
Douglas J. Spieles
Keyword(s):  
Bird Species ◽  
Land Development ◽  
Logistic Models ◽  
Field Measurements ◽  
Road Density ◽  
Bird Abundance ◽  
Aerial Photos ◽  
Landscape Variables ◽  
Buffer Width ◽  
Landscape Scales

We used aerial photography, field measurements, and bird surveys to evaluate 7 Ohio mitigation wetlands for their capacity to support avian guilds at both local and landscape scales. At the local scale, we assessed each wetland with habitat suitability indices (HSI) for eight wetland-dependent bird species as indicators for four guilds: wading, diving, dabbling, and emergent dependent. We characterized landscapes within 2.5 km of each wetland by measuring the buffer width, road density, connectedness, and anthropogenic land development. The changes in landscape variables over time were determined by comparison of aerial photos taken near the time of wetland construction and near the time of this study. Bird abundance data were poorly correlated with HSI scores but were well described with logistic models of buffer width, wetland area, and road density. Our results suggest that landscape variables are better predictors of bird abundance than HSI scores for these guilds in these wetlands.

scholarly journals Abundance and genetic diversity responses of a lizard (Eulamprus heatwolei) to logging disturbance

2017 ◽  
Vol 65 (6) ◽  
pp. 362
Author(s):  
Francesca Lyndon-Gee ◽  
Joanna Sumner ◽  
Yang Hu ◽  
Claudio Ciofi ◽  
Tim S. Jessop
Keyword(s):  
Genetic Diversity ◽  
Forest Management ◽  
Management Practices ◽  
Forest Disturbance ◽  
Population Level ◽  
Landscape Scale ◽  
Population Abundance ◽  
Animal Populations ◽  
Eastern Australia ◽  
Logging Disturbance

Rotational logging practices are used with the goal of reducing forest disturbance impacts on biodiversity. However, it is poorly understood whether such forest management practices conserve the demographic and genetic composition of animal populations across logged landscapes. Here we investigated whether rotational logging practices alter patterns of landscape-scale population abundance and genetic diversity of a forest-dwelling lizard (Eulamprus heatwolei) in south-eastern Australia. We sampled lizards (n = 407) at up to 48 sites across a chronosequence of logging disturbance intervals (<10 to >60 years after logging) to assess site-specific population changes and genetic diversity parameters. Lizard abundances exhibited a significant curvilinear response to time since logging, with decreased numbers following logging (<10 years), increased abundance as the forest regenerated (10–20 years), before decreasing again in older regenerated forest sites (>30 years). Lizard genetic diversity parameters were not significantly influenced by logging disturbance. These results suggest that logging practices, whilst inducing short-term changes to population abundance, had no measurable effects on the landscape-scale genetic diversity of E. heatwolei. These results are important as they demonstrate the value of monitoring for evaluating forest management efficacy, and the use of different population-level markers to make stronger inference about the potential impacts of logging activities.

Relative importance of local and landscape variables on fish assemblages in streams of Brazilian savanna

2019 ◽  
Vol 26 (2) ◽  
pp. 119-130 ◽  
Author(s):  
Hugo de Oliveira Barbosa ◽  
Pedro Paulino Borges ◽  
Renato Bolson Dala-Corte ◽  
Patrick Thomaz de Aquino Martins ◽  
Fabrício Barreto Teresa
Keyword(s):  
Fish Assemblages ◽  
Brazilian Savanna ◽  
Relative Importance ◽  
Landscape Variables

An assessment of dead wood patterns and their relationships with biophysical characteristics in two landscapes with different disturbance histories in coastal Oregon, USA

2007 ◽  
Vol 37 (5) ◽  
pp. 940-956 ◽  
Author(s):  
Rebecca S.H. Kennedy ◽  
Thomas A. Spies
Keyword(s):  
Dead Wood ◽  
Structural Type ◽  
Landscape Scale ◽  
Relative Importance ◽  
Riparian Areas ◽  
Wood Volume ◽  
Source Areas ◽  
Topographic Positions ◽  
Vegetation And Climate ◽  
Biophysical Attributes

Understanding the relative importance of landscape history, topography, vegetation, and climate to dead wood patterns is important for assessing pattern–process relationships related to dead wood and associated biodiversity. We sampled dead wood at four topographic positions in two landscapes (1400–2100 km2) that experienced different wildfire and salvage histories in coastal Oregon. Study objectives were to (i) determine whether and how the landscapes differed in dead wood amounts and characteristics and (ii) evaluate relationships between dead wood characteristics and potentially related biophysical variables associated with historical and current vegetation, topography, climate, soils, and ecoregion. Despite differences in history, the two landscapes differed little in total dead wood volume; however, they differed in dead wood volume by structural type, decay class, and source (legacy/nonlegacy). Dead wood varied by topographic position, and topography was of greatest importance compared with other factors. In this mountainous region, upper topographic positions may be source areas for dead wood and riparian areas and streams sinks for dead wood. Climate explained more variance in dead wood in the landscape that burned earlier and was not salvaged. Landscape-scale patterns of dead wood are evident in landscapes with different disturbance histories and despite finer-scale variation in topography, vegetation, and other biophysical attributes.

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