scholarly journals Egg-production dynamics, biochemical composition and hatching success of the subantarctic copepod Paraeuchaeta antarctica: laboratory studies

2000 ◽  
Vol 205 ◽  
pp. 219-227 ◽  
Author(s):  
F Alonzo ◽  
P Mayzaud ◽  
S Razouls
Keyword(s):  
Biochemical Composition ◽  
Egg Production ◽  
Hatching Success ◽  
Laboratory Studies ◽  
Production Dynamics

Effects of Experience and Body Weight on Incubation Behavior of Canada Geese

The Auk ◽  
1983 ◽  
Vol 100 (3) ◽  
pp. 670-679 ◽  
Author(s):  
Thomas W. Aldrich ◽  
Dennis G. Raveling
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Hatching Success ◽  
Important Variable ◽  
Canada Geese ◽  
Critical Weight ◽  
Incubation Behavior ◽  
Risk Of Predation ◽  
First Time ◽  
Foraging Time

Abstract During 1979 and 1980, we studied the incubation behavior and body-weight dynamics of captive Canada Geese (Branta canadensis moffitti) with known breeding histories. Females were attentive to their nests for 97.5% of the incubation period and lost 27% of their initial body weight. Heavier females were more attentive to their nests and lost more weight during incubation than did lighter females. Variation in body weight among females was greatest at the onset of incubation and least at hatch, which suggests that females invested maximum reserves in incubation. Recess frequency and duration increased throughout incubation, resulting in more foraging time for the female. Once a lower critical weight of about 3,200 g was reached, the amount of recess time taken increased dramatically, probably because lipid reserves were depleted. Females nesting for the first time began incubation at a lighter body weight and were less attentive than experienced females. All inexperienced females were either 4 or 5 yr old, but their egg production (4 eggs) was that of 2- or 3-yr-old wild females. This indicated that experience rather than age was the important variable affecting acquisition of reserves. Inattentiveness to a nest by a female prolongs the duration of incubation and exposes the nest to a greater risk of predation. The inability of inexperienced females to gain enough reserves to provide for both maximum clutch size and attentiveness during incubation may be a major explanation for the lower hatching success of geese nesting for the first time.

Egg production and hatching success in North Adriatic Sea populations of the copepod acartia clausi

2002 ◽  
Vol 18 (1-2) ◽  
pp. 117-125 ◽  
Author(s):  
Antonio Miralto ◽  
Adrianna Ianora ◽  
Isabella Buttino ◽  
Giovanna Romano ◽  
Mario Di Pinto
Keyword(s):  
Egg Production ◽  
Hatching Success ◽  
Adriatic Sea ◽  
Acartia Clausi ◽  
North Adriatic Sea

Polyandry increases reproductive performance but does not decrease survival in female Brontispa longissima

2016 ◽  
Vol 107 (2) ◽  
pp. 165-173 ◽  
Author(s):  
K. Kawazu ◽  
W. Sugeno ◽  
A. Mochizuki ◽  
S. Nakamura
Keyword(s):  
Reproductive Performance ◽  
Egg Production ◽  
Hatching Success ◽  
Multiple Mating ◽  
Preoviposition Period ◽  
Extreme Polyandry ◽  
Single Mating ◽  
Female Longevity ◽  
Experimental Treatments ◽  
Direct And Indirect Benefits

AbstractThe costs and benefits of polyandry are still not well understood. We studied the effects of multiple mating on the reproductive performance of female Brontispa longissima (Coleoptera: Chrysomelidae), one of the most serious pests of the coconut palm, by using three experimental treatments: (1) singly-mated females (single treatment); (2) females that mated 10 times with the same male (repetition treatment); and (3) females that mated once with each of 10 different males (polyandry treatment). Both multiple mating treatments resulted in significantly greater total egg production and the proportion of eggs that successfully hatched (hatching success) than with the single mating treatment. Furthermore, the polyandry treatment resulted in greater total egg production and hatching success than with the repetition treatment. Thus, mate diversity may affect the direct and indirect benefits of multiple mating. Female longevity, the length of the preoviposition period, the length of the period from emergence to termination of oviposition, and the length of the ovipositing period did not differ among treatments. The pronounced fecundity and fertility benefits that females gain from multiple mating, coupled with a lack of longevity costs, apparently explain the extreme polyandry in B. longissima.

Egg production dynamics and fecundity of Heterakis gallinarum residing in different caecal environments of chickens induced by fibre-rich diets

2014 ◽  
Vol 205 (3-4) ◽  
pp. 606-618 ◽  
Author(s):  
Gürbüz Daş ◽  
Hansjörg Abel ◽  
Türker Savaş ◽  
Birgit Sohnrey ◽  
Matthias Gauly
Keyword(s):  
Egg Production ◽  
Heterakis Gallinarum ◽  
Production Dynamics

The reproductive success of tree swallows nesting near experimentally acidified lakes in northwestern Ontario

1993 ◽  
Vol 71 (6) ◽  
pp. 1090-1097 ◽  
Author(s):  
Vincent L. St. Louis ◽  
Jon C. Barlow
Keyword(s):  
Egg Production ◽  
Hatching Success ◽  
Wing Length ◽  
Freshwater Ecosystems ◽  
Tree Swallows ◽  
Potentially Toxic Metals ◽  
Growth Functions ◽  
Northwestern Ontario ◽  
Acidified Lakes ◽  
Reference Lakes

We examined a number of reproductive parameters of tree swallows (Tachycineta bicolor) breeding near experimentally acidified lakes in northwestern Ontario. We found that near acidified lakes, eggs were smaller in certain dimensions, hatching success was lower (and by definition fewer nestlings fledged per nest box), certain nestling body characters were smaller 4 days posthatch, nestling wing length was shorter near time of fledging, and growth functions were different from those near unmanipulated reference lakes. These results are consistent with earlier findings that calcium-rich food items needed for egg production by laying females and growth of nestlings are more scarce at acidified lakes than at nonacidic reference lakes, and that potentially toxic metals accumulate to higher concentrations both in the chironomids that swallows consume and in nestling swallows at acidified lakes. Our results clearly show that even nonaquatic organisms are affected by acidification of freshwater ecosystems.

THE LIFE HISTORY OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (COLEOPTERA: CURCULIONIDAE) UNDER CONTROLLED CONDITIONS

1976 ◽  
Vol 108 (9) ◽  
pp. 931-934 ◽  
Author(s):  
P. Martel ◽  
H. J. Svec ◽  
C. R. Harris
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Larval Stage ◽  
Egg Production ◽  
Laboratory Studies ◽  
Preoviposition Period ◽  
Complete Life Cycle ◽  
History Of ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractLaboratory studies on the biology of the carrot weevil, Listronotus oregonensis (LeConte), were performed at 21° and 27 °C. At 21 °C females laid eggs for 88 days on carrot slices and 94 days on foliage. Egg production per female averaged 156 and 175 on slices and leaves respectively. Eggs hatched after 8.3 days incubation and the larval stage comprising four instars was completed in 19.1 days. The prepupal and pupal stages lasted 3.7 and 9.4 days respectively. The complete life cycle including an average preoviposition period of 17 days was 57.6 days. Development was more rapid at 27 °C, with the complete life cycle taking only 37 days.

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