Fecundity and Egg Mass Size of the Illinois Chorus Frog, Pseudacris streckeri illinoensis (Hylidae), from Northeastern Arkansas

1989 ◽  
Vol 34 (4) ◽  
pp. 556
Author(s):  
Brian P. Butterfield ◽  
Walter E. Meshaka ◽  
Stanley E. Trauth
Keyword(s):  
Egg Mass ◽  
Mass Size ◽  
Chorus Frog ◽  
Egg Mass Size

Population Biology of Orangestriped Oakworm (Lepidoptera: Saturniidae) in Southeastern Virginia

1993 ◽  
Vol 28 (2) ◽  
pp. 218-229
Author(s):  
Mark A. Coffelt ◽  
Peter B. Schultz
Keyword(s):  
Population Biology ◽  
Development Time ◽  
First Generation ◽  
Second Generation ◽  
Egg Mass ◽  
Mass Size ◽  
Quercus Palustris ◽  
The Mean ◽  
Pupal Mortality ◽  
Egg Mass Size

Population biology of orangestriped oakworm, Anisota senatoria (J. E. Smith), was studied in southeastern Virginia. Egg mass size was larger on Quercus palustris Muench., pin oak, compared with Q. phellos L., willow oak. Females produced a sex pheromone that attracted male moths. Blacklight traps were not effective for monitoring A. senatoria adults. Peak male emergence occurred on 2 July, 4 days earlier than female. The mean life span was 33.5 days in the laboratory. Pupal mortality was high and only 1.2% of the pupae produced moths in 1989 and 1990. Pupae were capable of overwintering for two years in the field. The first report of a second generation from September - November was documented. Second generation A. senatoria oviposited more egg masses, infested more trees and had a longer development time compared with first generation. Large egg mass size, pupae that were capable of overwintering for two years and the presence of a second generation may partially explain the consistent A. senatoria populations that have occurred in southeastern Virginia.

Increased per-capita investment in egg production by female apple snails in the presence of predatory common carp

Behaviour ◽  
2003 ◽  
Vol 140 (7) ◽  
pp. 935-945 ◽  
Author(s):  
Katsuya Ichinose ◽  
Masahisa Tochihara
Keyword(s):  
Life History ◽  
Common Carp ◽  
Egg Production ◽  
Life History Traits ◽  
Rice Field ◽  
Reproductive Effort ◽  
Egg Mass ◽  
Mass Size ◽  
Per Capita ◽  
Egg Mass Size

AbstractWe hypothesized that apple snails would change life-history traits in the presence of common carp to reduce or avoid predation risk. Carp of about 150 mm body length were released in small plots set in a rice field in southern Japan at 0, 0.2, or 0.6 carp/m2. Egg-mass size, proportion of hatched eggs, and duration of hatching of the snail were measured once or twice a week from July to September. Snails collected in traps were used to estimate both snail density by the Jolly-Seber mark-recapture method and distribution of shell lengths in each plot. The weight of the snail was regressed on a size-weight equation, and the snail biomass was determined by multiplying the estimated density and the regressed weight. The reproductive effort of the snails was calculated as the number of eggs divided by the biomass of adult females. The egg mass size and reproductive effort were significantly increased in the presence of carp. These increases were considered as life-history changes of apple snails in the presence of a predator.

scholarly journals Relationships Between Egg Mass Size and Egg Number per Egg Mass in the Casuarina Moth,Lymantria xylina(Lepidoptera: Lymantriidae)

2003 ◽  
Vol 32 (4) ◽  
pp. 752-755 ◽  
Author(s):  
Tse-Chi Shen ◽  
Yi-Shan Shae ◽  
Chen-Shawn Liu ◽  
Ching-Wen Tan ◽  
Shaw-Yhi Hwang
Keyword(s):  
Egg Mass ◽  
Egg Number ◽  
Mass Size ◽  
Egg Mass Size
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