Relationships of Lipids to Ovum Size in Amphibians

1998 ◽  
Vol 71 (6) ◽  
pp. 633-641 ◽  
Author(s):  
Mark J. Komoroski ◽  
Roy D. Nagle ◽  
Justin D. Congdon
Keyword(s):  
Ovum Size

scholarly journals Extraordinary sperm to egg ratios in seabirds

The Auk ◽  
2020 ◽  
Vol 137 (4) ◽  
Author(s):  
Nicola Hemmings ◽  
Tim R Birkhead
Keyword(s):  
Fertilization Success ◽  
Sufficient Time ◽  
Yolk Formation ◽  
Seabird Species ◽  
Egg Formation ◽  
Order Of Magnitude ◽  
Lag Period ◽  
The Relationship ◽  
Time Away ◽  
Ovum Size

Abstract Following copulation, females of many seabird species spend a prolonged period of time away from the colony, building up reserves for egg formation and incubation. Here, we report that the number of sperm associated with eggs of single-egg clutch seabirds was almost an order of magnitude greater than predicted from the relationship between ovum size and sperm numbers in multi-egg clutch non-seabirds. Sperm numbers were also several times greater than the estimated number necessary for maximal fertilization success. Our results are consistent with 3 unusual features of seabird reproduction: (1) single-egg clutches, (2) prolonged sperm storage, and (3) a lag period between the end of yolk formation and ovulation. We hypothesize that sperm release from storage is under precise temporal control in these species, with high sperm numbers acting as an insurance against infertility in single-egg clutches. If true, the lag period may have evolved to provide sufficient time for sperm to be released simultaneously from storage and accumulate at the site of fertilization prior to ovulation.

Reproductive Season, Fecundity, and Ovum Size of the Skygazer Shiner, Notropis uranoscopus, in Alabama

2019 ◽  
Vol 182 (2) ◽  
pp. 260
Author(s):  
David C. Heins ◽  
Robert Pashkin ◽  
J. Malcolm Pierson
Keyword(s):  
Reproductive Season ◽  
Ovum Size

scholarly journals Effect of Insecticide Dichlorvos on Ovaries of Mosquito Fish Gambusia affinis (Baird and Girard)

2011 ◽  
Vol 8 (4) ◽  
pp. 934-939
Author(s):  
Baghdad Science Journal
Keyword(s):  
Gonadosomatic Index ◽  
Gambusia Affinis ◽  
Mosquito Fish ◽  
Ovum Size ◽  
Sublethal Concentrations

The toxicity of insecticide dichlorvos (90%) was tested in ovaries of mosquito fish using three sublethal concentrations (0.3, 0.6, 0.8 µg/L) and studied their effects on the means of body and ovary weights, gonadosomatic index, ovum size and ova number. Results showed that there was a significant (P

Ontogenetic Variation in "Ovum" Size in Two Species of Ambystoma

Copeia ◽  
1979 ◽  
Vol 1979 (2) ◽  
pp. 348 ◽  
Author(s):  
Robert H. Kaplan
Keyword(s):  
Ontogenetic Variation ◽  
Ovum Size
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