ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Effect of adult mallard age on avian reproductive tests (1986)

Gile, Jay D. ; Meyers, S. Mark

Springer

Archives of environmental contamination and toxicology 15 (1986), S. 751-755

add to mindlist on the mindlist

Details

ISSN: 1432-0703

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine

Notes: Abstract This study was designed to determine the effect of using two different ages of mallard (Anas platyrhynchos) adults within the first breeding season on reproductive tests under standard Toxic Substances Control Act avian reproductive guide-lines. The adult age groups were 7 and 11 months at test initiation. The test chemical was an organophosphate insecticide, chlorpyrifos. The parameters evaluated included food consumption, adult body weight, brain acetylcholinesterase levels, egg production, fertility, hatchability, egg shell thickness, egg weight, and duckling survival and weight. Chlorpyrifos exposure reduced adult body weight, brain acetylcholinesterase activity, egg production, egg shell thickness, egg weight, and day 0 duckling weight in both age groups. Statistically, adult age affected only duckling day 14 weight. However, three of the 7-month hens produced phenotypically different ducklings, suggesting the presence of a different genotype which may have impacted the day 14 weight. Overall age ranging between 7 and 11 months at test initiation did not affect this mallard reproductive test. In addition, the results of this study demonstrate the importance of using phenotypicaily and genotypically similar test birds.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01054922

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

Mallard reproductive testing in a pond environment: A preliminary study (1986)

Meyers, S. Mark ; Gile, Jay D.

Springer

Archives of environmental contamination and toxicology 15 (1986), S. 757-761

add to mindlist on the mindlist

Details

ISSN: 1432-0703

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine

Notes: Abstract A 2-year preliminary study was conducted on mallard ducks (Anas platyrhynchos), to determine the feasibility of using outdoor pond enclosures for reproductive studies and to evaluate the effects of the insecticide chlorpyrifos on mallard reproduction. No significant reproductive effects were observed for mallards receiving 8 ppm (mg/kg of feed) chlorpyrifos in their diet. Birds receiving 80 ppm chlorpyrifos hatched significantly (p 〈 0.05) fewer ducklings per successful nest (5.8) than controls (10.2). None of the ducklings on treatment ponds survived to 7 days. Control birds produced 8.4 ducklings per successful nest surviving to 7 days or longer. Birds in the 80 ppm treatment group consumed less feed than did controls (p 〈 0.01). Weight loss from reduced feed consumption did not occur to the extent expected, indicating that birds supplemented their diets with natural foods found in and around the ponds. In spite of relatively low treated feed consumption, brain acetylcholinesterase was significantly (p 〈 0.05) depressed (57% of controls) for 80 ppm treated birds. Studies on indoor penned mallards fed 80 ppm chlorpyrifos in their diet also resulted in acetylcholinesterase depression to the same extent, but at much higher feed consumption levels. The study demonstrated the potential of using outdoor pond enclosures to evaluate chemical effects on food consumption, brain acetylcholinesterase, and reproduction in mallards. Improvements to the study design and to the pond enclosures are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01054923

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Irrigation scheduling — Theoretical approach and application problems (1987)

Yaron, D. ; Dinar, A. ; Meyers, S.

Springer

Water resources management 1 (1987), S. 17-31

add to mindlist on the mindlist

Details

ISSN: 1573-1650

Keywords: Irrigation scheduling (on-farm) ; crop response functions ; water shadow prices ; field layout

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying , Geography

Notes: Abstract The paper presents a theoretical approach to on-farm irrigation scheduling and discusses the problems of its real-life application to cotton farms in Israel. The theoretical approach is based on a loop of Linear Programming and Dynamic Programming problems which sequentially generate new irrigation schedules for the farm's crops in response to shadow prices of water. The major problems in the real-life application of this approach are (i) the lack of generally accepted estimates of cotton response to soil moisture, and (ii) the difficulty in adapting the LP results expressed in terms of continuous variables to the actual field layout and irrigation equipment of the farms. These problems are discussed and solutions are suggested and evaluated.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00421795

Permalink