نتایج جستجو برای: water and salinity limitations

تعداد نتایج: 16937283  

Journal: :Physiological and biochemical zoology : PBZ 2003
Carol Eunmi Lee Christine H Petersen

Invasive species are commonly thought to have broad tolerances that enable them to colonize new habitats, but this assumption has rarely been tested. In particular, the relative importance of acclimation (plasticity) and adaptation for invasion success are poorly understood. This study examined effects of short-term and developmental acclimation on adult salinity tolerance in the copepod Euryte...

Journal: :Diseases of aquatic organisms 2000
R S Kirk C R Kennedy J W Lewis

The effect of salinity on hatching, larval survival and infectivity of Anguillicola crassus was studied under experimental conditions using eggs obtained from naturally infected eels. Egg hatching rate, second-stage larval survival and larval infectivity were maximal in fresh water and declined with increase in salinity. Larvae survived up to 100 d in fresh water, 70 d in 50 % sea water and 40 ...

2012
D H Gadani V A Rana S P Bhatnagar A N Prajapati A D Vyas

The complex permittivity ∈=∈′− j∈′′ of distilled water and NaCl solutions of concentrations varying from 5000 to 35000 ppm have been measured in the frequency range from 200 MHz to 1.4 GHz using a Vector Network Analyzer (VNA). The complex permittivity of saline water collected from Kanyakumari sea bank has also been measured in this frequency range. It has been observed that the dielectric con...

2016
Peng Han Zhi-jian Wang Anne-Violette Lavoir Thomas Michel Aurélie Seassau Wen-yan Zheng Chang-ying Niu Nicolas Desneux

Variation in resource inputs to plants may trigger bottom-up effects on herbivorous insects. We examined the effects of water input: optimal water vs. limited water; water salinity: with vs. without addition of 100 mM NaCl; and their interactions on tomato plants (Solanum lycopersicum), and consequently, the bottom-up effects on the tomato leaf miner, Tuta absoluta (Meytick) (Lepidoptera: Gelec...

2007
Shih-Huan Lin Chih-Wei Chang Yoshiyuki Iizuka Wann-Nian Tzeng

Although otolith Strontium (Sr)/calcium (Ca) ratios have been widely used to reconstruct the past salinity environmental history of anguillid eels, factors affecting the Sr/Ca ratios in otoliths are incompletely understood. Japanese Eel (Anguilla japonica) elvers (mean length 54.7±2.1 mm) were collected in the estuary during their upstream migration and reared at 5 different salinities (0, 5, 1...

Journal: :آب و خاک 0
معصومه صالحی محمد کافی علیرضا کیانی

abstract in order to optimize the water management in agriculture in semi arid and arid conditions water-salinity function should be evaluated. in order to evaluate salinity and deficit irrigation two experiments were conducted in 2008 and 2009. kochia was grown with six levels of saline water (1.5, 7, 14, 21, 28, and 35 ds/m) and three levels of applied water (25, 75, and 125 percent of the wa...

2012
Nadia Bazihizina Edward G. Barrett-Lennard Timothy D. Colmer

Soil salinity is generally spatially heterogeneous, but our understanding of halophyte physiology under such conditions is limited. The growth and physiology of the dicotyledonous halophyte Atriplex nummularia was evaluated in split-root experiments to test whether growth is determined by: (i) the lowest; (ii) the highest; or (iii) the mean salinity of the root zone. In two experiments, plants ...

2013
Hengzhen Li Liming Hu Zhiran Xia

Micro-nano bubbles (MNBs) technology has shown great potential in groundwater bioremediation because of their large specific surface area, negatively charged surface, long stagnation, high oxygen transfer efficiency, etc. Groundwater salinity, which varies from sites due to different geological and environmental conditions, has a strong impact on the bioremediation effect. However, the groundwa...

Journal: :فیزیک زمین و فضا 0
فرشته کمیجانی دانشجوی دکتری فیزیک دریا، دانشگاه علوم و فنون دریایی وحید چگینی استادیار، مرکز ملی اقیانوس شناسی، محمد رضا بنازاده ماهانی استاد، دانشگاه تربیت مدرس، محمدسعید سنجانی کارشناس ارشد فیزیک دریا، مرکز ملی اقیانوس شناسی،

in this study variations of field data such as temperature, salinity and density in and across the transects of chahbahar bay were analyzed using ctd data acquired between winter 2006 and spring 2007 (winter monsoon).the results showed that thermocline layer intensify in mouth of bay between 2m and 6m with 7.81 ?c decrease before the gonou hurricane occured (mid-may 2007). below thermocline lay...

2004
W. Barclay Shoemaker

Numerical models that account for the effects of fluid density on ground water flow are being used more frequently to address scientific, engineering, and water resource management problems (Voss and Wood 1993; Voss 1999; Voss and Andersson 1993; Simmons et al. 1999; Simmons et al. 2002; Shoemaker and Edwards 2003; Langevin 2001). Also being used more frequently are inverse modeling routines ba...

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