Reproductive Tactics of Ladybird Beetles: Relationships Between Egg Size, Ovariole Number and Developmental Time

1991 ◽  
Vol 5 (3) ◽  
pp. 380 ◽  
Author(s):  
L. A. Stewart ◽  
J.-L. Hemptinne ◽  
A. F. G. Dixon
Keyword(s):  
Egg Size ◽  
Developmental Time ◽  
Reproductive Tactics ◽  
Ladybird Beetles ◽  
Ovariole Number

Clutch and egg size in ladybird beetles

Entomophaga ◽  
1991 ◽  
Vol 36 (3) ◽  
pp. 329-333 ◽  
Author(s):  
L. A. Stewart ◽  
A. F. G. Dixon ◽  
Z. Ruzicka ◽  
G. Iperti
Keyword(s):  
Egg Size ◽  
Ladybird Beetles

scholarly journals MODIFICATIONS OF MEAN OVARIOLE NUMBER, FRESH WEIGHT OF ADULT FEMALES AND DEVELOPMENTAL TIME IN DROSOPHILA MELANOGASTER INDUCED BY DROSOPHILA C VIRUS

Genetics ◽  
1984 ◽  
Vol 107 (4) ◽  
pp. 635-644
Author(s):  
Michele Thomas-Orillard
Keyword(s):  
Drosophila Melanogaster ◽  
Maternal Effects ◽  
Developmental Time ◽  
Fresh Weight ◽  
Adult Females ◽  
The Mean ◽  
Ovariole Number

ABSTRACT Drosophila C virus, a picornavirus that has some influence on ovarian morphogenesis, was discovered in a French strain of Drosophila melanogaster. When the strain was infected by Drosophila C virus (DCV), the mean number of ovarian tubes and weights of the adult females increased, but the developmental time from egg to imago decreased. The maternal effects observed when DCV was present disappeared when the strain was DCV free but were restored by experimental contamination.

Reproductive tactics of Ameiva ameiva (Lacertilia: Teiidae) in a seasonally fluctuating tropical habitat

1982 ◽  
Vol 60 (12) ◽  
pp. 3113-3120 ◽  
Author(s):  
Laurie J. Vitt
Keyword(s):  
Body Mass ◽  
Egg Size ◽  
Fat Body ◽  
Reproductive Activity ◽  
Female Size ◽  
Northeast Brazil ◽  
Reproductive Tactics ◽  
Males And Females ◽  
Fat Bodies ◽  
Fat Body Mass

The reproductive ecology of Ameiva ameiva was studied for 12 months in a caatinga habitat of northeast Brazil. Even though rainfall was seasonal, the female reproductive cycle was not associated with this seasonality. Females reproduced year-round, with peak reproductive periods during August–October and January–February. Clutch size ranged from one to nine and was correlated to female size but egg size was constant. Males showed evidence of reproductive activity throughout the year. Fat body mass of males and females varied greatly among individuals. There was no association between fat storage and wet–dry seasonality. In females, fat body mass tended to decrease during peak reproductive periods. Most striking was the observation that 97.8% of all adult Ameiva possessed enlarged fat bodies, suggesting that resource periods low enough to affect reproduction did not exist during 1977–1978. The reproductive tactics of Ameiva were similar to those of other tropical macroteiids, regardless of their distribution, but very different than reproductive tactics of sympatric iguanid lizards. Compared with iguanid lizards, resources may be less limiting for macroteiids because their widely foraging behavior for prey acquisition may allow them to find rich patches of resources which would be unavailable to habitat specific sit-and-wait foragers, like most iguanid lizards.

Effects of Predation and Trophic Conditions on the Reproduction of Tylototriton verrucosus (Caudata: Salamandridae) in Darjeeling

2011 ◽  
Vol 4 (2) ◽  
pp. 163-169 ◽  
Author(s):  
Ritwik Dasgupta
Keyword(s):  
Frequency Distribution ◽  
Primary Productivity ◽  
Egg Size ◽  
Zooplankton Abundance ◽  
Trophic Conditions ◽  
Size Frequency Distribution ◽  
Size Frequency ◽  
High Predation ◽  
Hatchling Size ◽  
Predation Rates

The facts that small hatchlings emerged from small eggs laid under high predation levels prevailing at the lower altitudes of distribution of this species in Darjeeling while larger hatchlings emerged from larger eggs laid under lower levels of predation at higher altitudes, show that predation is not selected for large egg and initial hatchling size in this salamandrid species. Metamorphic size was small under high predation rates because this species relied on crypsis for evading predators. Egg and hatchling size are related inversely to levels of primary productivity and zooplankton abundance in lentic habitats. Hatchling sizes are related positively to egg size and size frequency distribution of zooplankton. Small egg and small hatchling size have been selected for at the lower altitudes of distribution of this salamandrid in Darjeeling because predation rates increased in step with improvement in trophic conditions at the lower altitudes.

scholarly journals Latitudinal Variation in Ayu Egg Size

1993 ◽  
Vol 59 (12) ◽  
pp. 2087-2087 ◽  
Author(s):  
Kei'ichiroh Iguchi
Keyword(s):  
Egg Size ◽  
Latitudinal Variation
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