Differing Catchability among Lakes: Influences of Lake Basin Morphology and other Factors on Gill-Net Catchability of Northern Pike

2010 ◽  
Vol 139 (4) ◽  
pp. 1109-1120 ◽  
Author(s):  
Rodney B. Pierce ◽  
Cynthia M. Tomcko ◽  
Donald L. Pereira ◽  
David F. Staples
2012 ◽  
Vol 518-523 ◽  
pp. 4510-4520
Author(s):  
Hong Shuai ◽  
Jing Bao Li ◽  
Si Min Xu ◽  
Yu Dan Li

The lake basin morphology is closely related to the health level of the lake system function. It is the prerequisite and fundamental to evaluate whether the lake ecosystem and service function are healthy or not. According to historical documents, maps, water and sediment data from 1986 to 2010, the author evaluated the health of the lake basin morphology on the typical years by using the catastrophe progression method and by selecting 8 indicators which includes the exposed frequency of bottomland, hydrodynamic conditions and geometry form of the lake basin.The results showed that: ① The East Dongting Lake has a relatively good health status ( the average of membership grade is 0.7486), but with high fluctuations (0.6775 ~ 0.7965); then followed by South Dongting Lake, (0.7311); the worst is West Dongting Lake (0.7269) while it has a minimum fluctuation of health relative membership degree (0.7026 ~ 0.7487);② In the last 20 years, the health standard of the Morphological Structure of Dongting Lake Basin has shown an tendency of "firstly get worse then improved" . It had the lowest healthy membership grade in 1998(0.6912), and the highest value in 2004(0.7711), the values of the remaining typical years are in between. They constitute a sufficient support to claim that the implementation of "4350" project, and the construction and impounding of the Three Gorges reservoir dam are so effective in improving the lake basin morphology toward the more healthy developing direction.


Author(s):  
Rodney B. Pierce ◽  
Cynthia M. Tomcko ◽  
Todd D. Kolander

2016 ◽  
Vol 16 (3) ◽  
pp. 121-128 ◽  
Author(s):  
Karolina Czarnecka ◽  
Janusz Dworniczak

Abstract The study relates to the use of the 210Pb method for determining sedimentation rates, sedimentation accumulation rates and identifying post-depositional processes. The analysis was based on seven cores of recent sediments collected from different parts of Lake Raduńskie Górne, which is a typical channel lake with diverse bottom morphology. We used alpha spectrometry to determine 210Pb activities in sediment samples and a CF:CS dating model to obtain mean sediment accumulation rates. The results show significant differences between coring sites with highest values in the deepest part of the lake and lowest within the shallow and flat bottom areas. The reason for such a large diversity is the lake basin morphology, e.g. steep slopes and complex configuration of the lake bottom, most probably responsible for the post-depositional sediment replacements.


1968 ◽  
Vol 46 (4) ◽  
pp. 797-803 ◽  
Author(s):  
W. C. Mackay ◽  
D. D. Beatty

The level of plasma glucose was investigated in specimens of white sucker and northern pike which had been caught at different times of the year by both gill net and trap net. Blood samples were collected for analysis within 1 minute of the time the fish were first handled.Male white suckers undergo a significant seasonal change in plasma glucose levels but female suckers do not. The plasma glucose of the female fish of both species was more variable than that of male fish sampled at the same time. At certain times of the year male fish of both species had a significantly lower plasma glucose concentration than female fish. Fish which had been caught by gill net or held in the laboratory were found to have higher, more variable plasma glucose levels than fish which were sampled from the trap net.


2017 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
Papontee Teeraphan

Pollution is currently a significant issue arising awareness throughout the world. In Thailand, pollution can often be seen in any part of the country. Air pollution is pointed as an urgent problem. This pollution has not damaged only to human health and lives, it has destroyed environment, and possibly leading to violence. In Phattalung, air pollution is affecting to the residents’ lives. Especially, when the residents who are mostly agriculturists have not managed the waste resulted from the farm. In Phattalung, at the moment, there are many pig farms, big and small. Some of them are only for consuming for a family, some, however, are being consumed for the business which pigs will be later purchased by big business companies. Therefore, concerning pollution, the researcher and the fund giver were keen to focus on the points of the air pollution of the small pig farms. This is because it has been said that those farms have not been aware on the pollution issue caused by the farms. Farm odor is very interesting which can probably lead to following problems. The researcher also hopes that this research can be used as a source of information by the government offices in order to be made even as a policy or a proper legal measurement. As the results, the study shows that, first, more than half of the samples had smelled the farm odor located nearby their communities, though it had not caused many offenses. Second, the majority had decided not to act or response in order to solve the odor problem, but some of them had informed the officers. The proper solutions in reducing offenses caused by pig farm odor were negotiation and mediation. Last, the majority does not perceive about the process under the Public Health Act B.E. 2535.


2017 ◽  
Vol 126 (3) ◽  
pp. 211-227 ◽  
Author(s):  
RG Getchell ◽  
ER Cornwell ◽  
S Bogdanowicz ◽  
J Andrés ◽  
WN Batts ◽  
...  

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