INFLUENCE OF LAND USE ON POSTMETAMORPHIC BODY SIZE OF PLAYA LAKE AMPHIBIANS

2005 ◽  
Vol 69 (2) ◽  
pp. 515-524 ◽  
Author(s):  
MATTHEW J. GRAY ◽  
LOREN M. SMITH
Keyword(s):  
Land Use ◽  
Body Size ◽  
Playa Lake

Diversity and body size of dung beetles attracted to different dung types along a tropical land-use gradient in Sulawesi, Indonesia

2009 ◽  
Vol 26 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Shahabuddin ◽  
Purnama Hidayat ◽  
Sjafrida Manuwoto ◽  
Woro A. Noerdjito ◽  
Teja Tscharntke ◽  
...  
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Body Size ◽  
Habitat Type ◽  
Dung Beetle ◽  
Habitat Disturbance ◽  
Dung Beetles ◽  
Natural Forest ◽  
Land Use Intensity ◽  
Habitat Types

Abstract:Dung beetles are a functionally important component of most terrestrial ecosystems, but communities change with habitat disturbance and deforestation. In this study, we tested if dung beetle ensembles on dung of introduced cattle and of the endemic anoa, a small buffalo, are affected differentially by habitat disturbance. Therefore, we exposed 10 pitfall traps, five baited with anoa and five baited with cattle dung, per site in six habitat types ranging from natural and selectively logged rain forest to three types of agroforestry system (characterized by different management intensity) and open areas (n = 4 replicate sites per habitat type) at the margin of Lore Lindu National Park, Central Sulawesi, Indonesia. We found 28 species, 43% of which were endemic to Sulawesi. Species richness, abundance and biomass declined from natural forest towards open area. Large-bodied species appeared to be more sensitive to habitat disturbance and the ratio of large to small-sized dung beetles declined with land-use intensity. Although selectively logged forest and cocoa agroforestry systems had lower species richness compared with natural forest, they appeared to maintain a high portion of species originally inhabiting forest sites. The similarity of dung beetle ensembles recorded at forest and agroforestry sites reflects the high similarity of some habitat variables (e.g. vegetation structure and microclimate) between both habitat types compared with open areas. Species richness and abundances as well as species composition, which was characterized by decreases in mean body size, changed with land-use intensity, indicating that dung type is less important than habitat type for determining ensemble structure of these Indonesian dung beetles.

scholarly journals Climate change and intensive land use reduce soil animal biomass via dissimilar pathways

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Rui Yin ◽  
Julia Siebert ◽  
Nico Eisenhauer ◽  
Martin Schädler
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Body Size ◽  
Global Change ◽  
Ecosystem Functions ◽  
Total Biomass ◽  
Soil Animal ◽  
Soil Microarthropods ◽  
Density And Biomass ◽  
Intensive Land Use

Global change drivers, such as climate change and land use, may profoundly influence body size, density, and biomass of soil organisms. However, it is still unclear how these concurrent drivers interact in affecting ecological communities. Here, we present the results of an experimental field study assessing the interactive effects of climate change and land-use intensification on body size, density, and biomass of soil microarthropods. We found that the projected climate change and intensive land use decreased their total biomass. Strikingly, this reduction was realized via two dissimilar pathways: climate change reduced mean body size and intensive land use decreased density. These findings highlight that two of the most pervasive global change drivers operate via different pathways when decreasing soil animal biomass. These shifts in soil communities may threaten essential ecosystem functions like organic matter turnover and nutrient cycling in future ecosystems.

scholarly journals Changes in water level, land use, and hydrological budget in a semi-permanent playa lake, Southwest Spain

2011 ◽  
Vol 184 (2) ◽  
pp. 797-810 ◽  
Author(s):  
M. Rodríguez-Rodríguez ◽  
A. J. Green ◽  
R. López ◽  
S. Martos-Rosillo
Keyword(s):  
Land Use ◽  
Water Level ◽  
Playa Lake

Measures of fish community size structure as indicators for stream monitoring programs

2020 ◽  
Vol 77 (5) ◽  
pp. 824-835
Author(s):  
Isaac A. Sutton ◽  
Nicholas E. Jones
Keyword(s):  
Land Use ◽  
Body Size ◽  
Power Law ◽  
Size Range ◽  
Size Structure ◽  
Size Spectrum ◽  
Community Size ◽  
Stream Monitoring ◽  
Lotic Ecosystem ◽  
Size Diversity

Characterization of community size structure presents an alternative to taxa-based approaches commonly applied to assess lotic ecosystem health. However, few studies have explored the relationship between community size structure and land use stresses in lotic systems. In the present study, we investigated use of metrics including mean body size, body size range, size diversity, size evenness, and the size spectrum slope as indicators of land use disturbance in streams. We also explored the effects of sampling intensity (one- versus three-pass electrofishing) on these size-based variables. We found significant decreases in size range and diversity with increased urban cover. In contrast, mean body size, size evenness, and size spectrum slopes were unrelated to variation in land use. Fewer than 25% of samples collected conformed to the power law model predicted for size distributions in aquatic ecosystems. However, increased departure from the power law form was related to agricultural cover and the use of three-pass electrofishing.

scholarly journals Pollinator body size mediates the scale at which land use drives crop pollination services

2014 ◽  
Vol 51 (2) ◽  
pp. 440-449 ◽  
Author(s):  
Faye E. Benjamin ◽  
James R. Reilly ◽  
Rachael Winfree
Keyword(s):  
Land Use ◽  
Body Size ◽  
Crop Pollination ◽  
Pollination Services

scholarly journals Land use and topography bend and break fractal rules of water body size-distributions

2017 ◽  
Vol 2 (3) ◽  
pp. 71-80 ◽  
Author(s):  
Meredith K. Steele ◽  
James B. Heffernan
Keyword(s):  
Land Use ◽  
Body Size ◽  
Water Body ◽  
Size Distributions

scholarly journals Climate change and intensive land use reduce soil animal biomass through dissimilar pathways

2020 ◽  
Author(s):  
Rui Yin ◽  
Julia Siebert ◽  
Nico Eisenhauer ◽  
Martin Schädler
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Body Size ◽  
Global Change ◽  
Ecosystem Functions ◽  
Soil Animal ◽  
Climate Change Effects ◽  
Independent Effects ◽  
Density And Biomass ◽  
Intensive Land Use

AbstractGlobal change drivers, such as climate and land use, may profoundly influence body size, density, and biomass of organisms. It is still poorly understood how these concurrent drivers interact in affecting ecological communities. We present results of an experimental field study assessing the interactive effects of climate change and land-use intensification on body size, density, and biomass of soil microarthropods. We found that both climate change and intensive land use decreased their total biomass. Strikingly, this reduction was realized via two dissimilar pathways: climate change reduced mean body size, while intensive land use decreased population size. These findings highlight that two of the most pervasive global change drivers operate via different pathways when decreasing soil animal biomass. These shifts in soil communities may threaten essential ecosystem functions like organic matter turnover and nutrient cycling in future ecosystems.SignificanceMany important ecosystem functions are determined by the biomass of soil animal, however, how their biomass may respond to climate change and land-use intensification still remains unknown. We conducted a large field study to investigate the potential interaction between these two pervasive global change drivers, and disentangle the pathways where they contribute to the changes in soil animal biomass. Our findings are exceptionally novel by showing detrimental, but largely independent, effects of climate change and land-use intensity on soil animal biomass, and that these independent effects can be explained by two dissimilar pathways: climate change reduced mean body size, while intensive land use decreased population size. Notably, consistent climate change effects under different land-use regimes suggest that (1) the identified pathways may apply to a wide range of environmental conditions, and (2) current extensive land-use regimes do not mitigate detrimental climate change effects on ecosystems.

Concordance of taxonomic composition patterns across multiple lake assemblages: effects of scale, body size, and land use

1999 ◽  
Vol 56 (11) ◽  
pp. 2029-2040 ◽  
Author(s):  
Andrew P Allen ◽  
Thomas R Whittier ◽  
David P Larsen ◽  
Philip R Kaufmann ◽  
Raymond J O'Connor ◽  
...  
Keyword(s):  
Land Use ◽  
Body Size ◽  
Environmental Gradient ◽  
Environmental Gradients ◽  
Taxonomic Composition ◽  
Forest Composition ◽  
Benthic Macroinvertebrate ◽  
Close Correspondence ◽  
Lake Productivity ◽  
Effects Of Land Use

We assessed environmental gradients and the extent to which they induced concordant patterns of taxonomic composition among benthic macroinvertebrate, riparian bird, sedimentary diatom, fish, and pelagic zooplankton assemblages in 186 northeastern U.S.A. lakes. Human population density showed a close correspondence to this region's dominant environmental gradient. This reflected the constraints imposed by climate and geomorphology on land use and, in turn, the effects of land use on the environment (e.g., increasing lake productivity). For the region as a whole, concordance was highest among assemblages whose taxa were relatively similar in body size. The larger-bodied assemblages (benthos, birds, fish) were correlated most strongly with factors of broader scale (climate, forest composition) than the diatoms and zooplankton (pH, lake depth). Assemblage concordance showed little or no relationship to body size when upland and lowland subregions were examined separately. This was presumably because differences in the scales at which each assemblage integrated the environment were obscured more locally. The larger-bodied assemblages showed stronger associations with land use than the diatoms and zooplankton. This occurred, in part, because they responded more strongly to broad-scale, nonanthropogenic factors that also affected land use. We argue, however, that the larger-bodied assemblages have also been more severely affected by human activities.

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