scholarly journals Differing insect communities and reduced decomposition rates suggest compromised ecosystem functioning in urban preserves of southern California

2022 ◽  
pp. e01996
Author(s):  
Daniel A. Marschalek ◽  
Douglas H. Deutschman
Keyword(s):  
Ecosystem Functioning ◽  
Southern California ◽  
Decomposition Rates ◽  
Insect Communities ◽  
Reduced Decomposition

Forestry affects the abundance of Phormidium-dominated biofilms and the functioning of a New Zealand river ecosystem

2017 ◽  
Vol 68 (9) ◽  
pp. 1741 ◽  
Author(s):  
Ibon Aristi ◽  
Joanne E. Clapcott ◽  
Vicenç Acuña ◽  
Arturo Elosegi ◽  
Holly Mills ◽  
...  
Keyword(s):  
New Zealand ◽  
Ecosystem Functioning ◽  
Fine Sediment ◽  
Economic Effects ◽  
Ecosystem Metabolism ◽  
Health Issues ◽  
River Ecosystem ◽  
Pine Plantation ◽  
Decomposition Rates ◽  
Alkaline Phosphate

Toxic cyanobacterial proliferations in water bodies can cause serious environmental and public health issues, as well as having economic effects. Increased inputs of nutrients and fine sediment caused by forestry have been hypothesised as possible causes of increased Phormidium-dominated proliferations in New Zealand rivers. Little is known about the effect of these proliferations on river ecosystem functioning. In the present study, we evaluated five sites along the Maitai River (New Zealand) differing in pine plantation cover of their catchments. We hypothesised that Phormidium biofilms would trap more sediments and recycle more phosphorus than diatoms, that Phormidium proliferations would increase with forestry cover in the catchment and that the varying abundance of Phormidium would affect river ecosystem functioning. Phormidium did not trap more sediment or recycle more phosphorus (measured as alkaline phosphate activity) than diatom biofilms. However, the cover of Phormidium did increase with the proportion of forestry in the catchment. Organic matter decomposition rates (measured as loss of tensile strength of standard cotton strips) varied very little among sites, whereas river ecosystem metabolism increased with the abundance of Phormidium, especially in the lower part of the river. The results of the present study suggest that pine forestry does promote Phormidium biofilm abundance and affect ecosystem functioning in the Maitai River.

Effects of the freshwater turtle Trachemys scripta elegans on ecosystem functioning: an approach in experimental ponds

2013 ◽  
Vol 34 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Megan K. Lindsay ◽  
Yixin Zhang ◽  
Michael R.J. Forstner ◽  
Dittmar Hahn
Keyword(s):  
Ecosystem Functioning ◽  
Sediment Accumulation ◽  
Ecosystem Processes ◽  
Aquatic Systems ◽  
Trachemys Scripta ◽  
Freshwater Turtle ◽  
Decomposition Rates ◽  
Trachemys Scripta Elegans ◽  
Artificial Ponds ◽  
Experimental Ponds

The effect of red-eared sliders (Trachemys scripta elegans) on aquatic ecosystem processes and macroinvertebrate community was investigated in artificial ponds that were stocked with turtles or kept free of them. Compared to ponds without turtles, ponds with turtles displayed significantly higher values of pH, conductivity, sediment accumulation, and leaf litter decomposition rates, as well as a higher abundance of invertebrates, specifically that of the Hemiptera and Ephemeroptera. The biomass of periphyton was not affected by the presence of turtles. These results suggest that the presence of T. s. elegans affects environmental conditions in ponds, and thus potentially ecosystem processes. Reduced abundance or loss of turtles in aquatic systems could therefore result in significant consequences on ecosystem functioning.

The Effects of Presentation on Noise and Dental Appliances on Speech

1981 ◽  
Vol 24 (1) ◽  
pp. 151-151
Author(s):  
Lillian Glass ◽  
Sharon R. Garber ◽  
T. Michael Speidel ◽  
Gerald M. Siegel ◽  
Edward Miller
Keyword(s):  
Southern California ◽  
University Of Southern California ◽  
University Of Minnesota ◽  
School Of Medicine ◽  
Southern California School ◽  
School Of Dentistry ◽  
The University

An omission in the Table of Contents, December JSHR, has occurred. Lillian Glass, Ph.D., at the University of Southern California School of Medicine and School of Dentistry, was a co-author of the article "The Effects of Presentation on Noise and Dental Appliances on Speech" along with Sharon R. Garber, T. Michael Speidel, Gerald M. Siegel, and Edward Miller of the University of Minnesota, Minneapolis.

Patiens of infectious diarrhea peaks in Southern California

2001 ◽  
Vol 120 (5) ◽  
pp. A215-A216
Author(s):  
C CONTEAS ◽  
J PRUTHI ◽  
R BURCHETTE
Keyword(s):  
Southern California ◽  
Infectious Diarrhea
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