نتایج جستجو برای: stabilization ponds

تعداد نتایج: 57066  

2012
W. BERRY LYONS KATHLEEN A. WELCH CHRISTOPHER B. GARDNER CHRIS JAROS DARYL L. MOORHEAD JENNIFER L. KNOEPFLE PETER T. DORAN

The McMurdo Dry Valleys of Antarctica are the largest ice-free region on the continent. These valleys contain numerous water bodies that receive seasonal melt from glaciers. For forty years, research emphasis has been placed on the larger water bodies, the permanent ice-covered lakes. We present results from the first study describing the geochemistry of ponds in the higher elevations of Taylor...

2012
BRIAN S. DORR

Estimating the catfish aquaculture production losses that can be attributed to double-crested cormorants (Phalacrocorax auritus) has proved problematic because knowledge of the distribution of cormorants on catfish aquaculture is lacking. We evaluated use versus availability of various production pond types and landscape-scale factors affecting the distribution of cormorants on channel catfish ...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2011
R De Oliveira H W Pearson J V N Silva J T Sousa V D Leite W S Lopes

This study evaluates the performance of four 2.3 m deep pilot-scale, independently loaded, primary facultative ponds treating predominantly domestic sewage in northeast Brazil. The ponds contained longitudinal baffles giving different length to width ratios from 3.55 to 32.4. The ponds had mean hydraulic retention times of ~15 days, and mean surface organic loadings of 330 kg BOD(5).ha.d(-1) du...

2007
BRAD C. TIMM KEVIN MCGARIGAL CHRISTOPHER L. JENKINS

We studied the emigration of juvenile age-class individuals of four species of pondbreeding amphibians at 14 seasonal ponds over four consecutive years in western Massachusetts. Emigration orientation of each species was non-uniform for the majority of pond-years examined. While orientation was decidedly non-uniform in most individual pond-years, combining data from successive years led to a mo...

Journal: :Evolution; international journal of organic evolution 2004
Benjamin M Fitzpatrick H Bradley Shaffer

After an estimated five million years of independent evolution, the barred tiger salamander (Ambystoma tigrinum mavortium) was introduced by bait dealers into the native range of the California tiger salamander (A. californiense). Hybridization and backcrossing have been occurring in central California for 50-60 years, or an estimated 15-30 generations. We studied genetic and ecological factors...

2006
Brian Riordan David Verbyla David McGuire

[1] Over the past 50 years, Alaska has experienced a warming climate with longer growing seasons, increased potential evapotranspiration, and permafrost warming. Research from the Seward Peninsula and Kenai Peninsula has demonstrated a substantial landscape-level trend in the reduction of surface water and number of closed-basin ponds. We investigated whether this drying trend occurred at nine ...

2000
Randall E. Brummett

Ž . Ž . Inputs of either napier grass NG or diammonium phosphate plus urea NP containing similar Ž y1 y1. Ž y1 y1. amounts of nitrogen 17 kg N ha week and phosphorus 1.2 kg P ha week were made to Tilapia rendalli ponds from which offspring were either partially removed or left to grow. After Ž . 364 days, average weight of stocked fish in NG ponds 74.3 g was significantly higher Ž . Ž . P-0.05 ...

2015
Stephen D. J. Archer Ian R. McDonald Craig W. Herbold Charles K. Lee Craig S. Cary

The numerous perennial meltwater ponds distributed throughout Antarctica represent diverse and productive ecosystems central to the ecological functioning of the surrounding ultra oligotrophic environment. The dominant taxa in the pond benthic communities have been well described however, little is known regarding their regional dispersal and local drivers to community structure. The benthic mi...

2015
M. Langer S. Westermann K. Walter Anthony K. Wischnewski J. Boike

Lakes and ponds play a key role in the carbon cycle of permafrost ecosystems, where they are considered to be hotspots of carbon dioxide CO2 and methane CH4 emission. The strength of these emissions is, however, controlled by a variety of physical and biogeochemical processes whose responses to a warming climate are complex and only poorly understood. Small waterbodies have been attracting an i...

2016
Jon Loman

Frog breeding phenology in temperate zones is usually compared to progress of spring temperatures at a regional scale. However, local populations may differ substantially in phenology. To understand this, local climate and other aspects must be studied. In this study, breeding phenology of the common frog, Rana temporaria, in a set of ponds in southern Sweden is analyzed. There was within year ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید