摘要:

Concentration of dissolved oxygen was measured during phytoplankton blooms ofGymnodinium breveoccurring along the west coast of Florida during 1976, 1977, and 1978. The dissolved oxygen (DO) levels during the most recent outbreak, occurring in September 1978, were measured on two occasions during predawn hours. At no time were the dissolved oxygen levels below 83% saturation, although the numbers ofG. breveorganisms were above the ichthyotoxic threshold level.

ISSN:0360-1226    

DOI:10.1080/10934527809374851

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

Laboratory‐reared virgin females of 3 species of Tephritidae oviposited significantly fewer eggs than similar previously mated females. Melon flies,Dacus cucurbitaeCoquillett, were most affected (3.0X more eggs for mated females), and Mediterranean fruit flies,Ceratitis capitata(Wiedemann), were least affected; oriental fruit flies,D.dorsalisHendel, were in between. Numbers of eggs laid by females mated with males treated either with tepa in drinking water or with gamma irradiation were not significantly different from those laid by females mated with untreated males. Thus, mating per se was important in enhancing oviposition regardless of the fertility of the males.

ISSN:0360-1226    

DOI:10.1080/10934527809374852

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

Benthic communities from a freshwater marsh were exposed to a No. 2 Fuel Oil, a Nigerian Crude Oil, and used crankcase oil in microcosm experiments in which natural conditions were simulated and hydrocarbon concentrations and exposure conditions were monitored. Growths ofVaucheriasp. were destroyed to varying degrees depending on oil type and exposure. Blue‐green algal development was fostered. Community metabolism shifted to a heterotrophic mode as a result of effects on algae and reduced photosynthesis but community respiration did not increase to a statistically significant extent on oil exposure. No. 2 Fuel Oil was the most damaging, used crankcase oil was least toxic and Nigerian Crude Oil was intermediate in degree of effect on metabolism.

ISSN:0360-1226    

DOI:10.1080/10934527809374853

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

A recent study1,2reported statistically significant differences in blood pressure distribution patterns between high school sophomores (16 years old) from a community with elevated levels of sodium (100 mg/1) in drinking water as compared to sophomores from a similarly matched community with less than 10 mg sodium/1.

ISSN:0360-1226    

DOI:10.1080/10934527809374854

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

In order to study the size distribution of a radioactivity due to radon daughters in the environmental atmosphere, an experimental procedure using filters, ion tubes, diffusion batteries and cascade impactors (CASELLA MK2 and ANDERSEN) is presented. A comparison between the experimental results and a theoretical curve, deduced of the attachment theory of the small radioactive ions on atmospheric particles, is carried out.

ISSN:0360-1226    

DOI:10.1080/10934527809374855

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

ISSN:0360-1226    

DOI:10.1080/10934527809374850

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor