scholarly journals Influence of Experimental Thermal Shifts and Overcrowding on Fecundity in Wild Females of Acartia Tonsa of the Bahía Blanca Estuary

2014 ◽  
Vol 62 (3) ◽  
pp. 201-207
Author(s):  
Berasategui Anabela Anahi ◽  
M. Celeste Lopez-Abbate ◽  
Florencia Biancalana ◽  
Monica S. Hoffmeyer
Keyword(s):  
Reproductive Performance ◽  
Egg Production ◽  
Opposite Effect ◽  
Hatching Success ◽  
Developmental Time ◽  
Acartia Tonsa ◽  
Bahía Blanca Estuary ◽  
Egg Production Rate ◽  
Blanca Estuary ◽  
Thermal Shift

The copepod Acartia tonsa plays an important role in the food web of many estuaries influenced by changes due to anthropic activities, hence it is relevant to know its reproductive plasticity under stressful conditions. We examined the influence of thermal shift (6 ± 1ºC and 18 ± 1ºC) and overcrowding stress on egg production and hatching success in wild females of A. tonsa of the Bahía Blanca Estuary. Egg production rate (EP), hatching success during seven days (E7 %) and time taken to hatch 50 % of eggs (T 50) were registered. The high individual density used in the incubations caused a decrease in EP values at both temperatures. Nevertheless, all the females responded favorably to 18°C. EP and E7 % obtained at both temperatures were significantly different the values at 18ºC, being twice as high as those obtained at 6°C. T 50 values at 18ºC indicated a shorter developmental time in eggs from spring females, whereas the opposite effect was observed in eggs from winter females. Our results indicate that the reproductive performance is affected by short exposures to thermal shift. The pattern of egg production and hatching is also modified in accordance with the maternal history.

The impact of dietary protein:carbohydrate balance on lifespan and reproduction in Protaetia brevitarsis (Coleoptera: Scarabaeidae: Cetoniinae)

2021 ◽  
pp. 1-8
Author(s):  
S.-H. Kim ◽  
H. Park ◽  
W. Kim ◽  
J.-H. Song ◽  
S.J. Roh ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Egg Production ◽  
Detailed Knowledge ◽  
Reproductive Senescence ◽  
Egg Hatchability ◽  
Edible Insect ◽  
Age Related ◽  
Medicinal Value ◽  
Egg Production Rate ◽  
The Impact

The establishment of efficient and sustainable production of industrially important insects necessitates the detailed knowledge of the optimal mixture of macronutrients required for maximising their performance and fitness. The white spotted flower chafer, Protaetia brevitarsis (Coleoptera: Scarabaeidae: Cetoniinae), is one of the most important edible insects in East Asia with high nutritional and medicinal value. Here, we report how the ratio of protein to digestible carbohydrate (P:C) in the diet influenced lifespan and reproductive performance in the adults of P. brevitarsis. Throughout their lifespan, beetles were fed ad libitum one of five diets with differing P:C ratio (0:1, 3:7, 1:1, 7:3, 1:0). Both lifespan and the number of eggs produced over the lifetime were maximised at the P:C ratio of 3:7 and declined as the ratio deviated away from this optimal P:C composition. Beetles fed a diet containing only protein (P:C 1:0) not only had the shortest lifespan but also exhibited substantially reduced lifetime egg production compared to those fed the other diets. However, the effects of dietary P:C ratio on daily egg production rate and egg hatchability were marginal. The number of eggs produced at each age stage peaked at the age of week 2 and then gradually declined with increasing age, showing the sign of reproductive senescence. Age-specific egg production was higher in beetles confined to three intermediate P:C ratios (3:7, 1:1, 7:3) than those confined to two extreme P:C ratios (0:1, 1:0) throughout their lifespan. The speed of age-related decrease in reproductive performance was the slowest at P:C 3:7. Our data have implications for optimising the production of this edible insect with emerging economic importance.

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.

Influence of prey species and concentration on egg production efficiency and hatching success in Acartia tonsa Dana (Copepoda, Calanoida)

Crustaceana ◽  
2015 ◽  
Vol 88 (6) ◽  
pp. 675-687 ◽  
Author(s):  
I. Wendt ◽  
P. Thor
Keyword(s):  
Egg Production ◽  
Production Efficiency ◽  
Prey Species ◽  
Hatching Success ◽  
Ingestion Rate ◽  
Acartia Tonsa ◽  
Egg Hatching ◽  
Prey Concentration ◽  
Algal Diets ◽  
Demand Limit

We measured ingestion rate (IR), egg production rate (EPR) and egg hatching success (EHS) at increasing prey concentrations and calculated egg production efficiency (EPE) and maintenance rate (MR) in the estuarine copepod Acartia tonsa fed three different algal diets. EPR and EHS were relatively more affected by prey species than by prey concentration. EPEs were constant among carbon concentrations (C) on a diet of Rhodomonas baltica (0.202 ± 0.055, mean ± SD) and Dunaliella tertiolecta (0.034 ± 0.015), but decreased significantly from 0.371 ± 0.062 (mean of two lowest prey concentrations) to 0.200 ± 0.019 at the highest concentration of Thalassiosira weissflogii. In general it seems that other requirements than C demand limit EPE and EHS in A. tonsa. The MR (IR when EPR = 0) was significantly higher on D. tertiolecta, which also yielded the lowest EPEs, and it seems that variations in maintenance requirements may have been instrumental in evoking EPE variations as well.

scholarly journals Growth, egg production and hatching success of Acartia tonsa cultured at high densities

Aquaculture ◽  
2017 ◽  
Vol 468 ◽  
pp. 569-578 ◽  
Author(s):  
Sofia C. Franco ◽  
Christina B. Augustin ◽  
Audrey J. Geffen ◽  
Maria Teresa Dinis
Keyword(s):  
Egg Production ◽  
Hatching Success ◽  
Acartia Tonsa

scholarly journals Effects of Temperature and pH on the Egg Production and Hatching Success of a Common Korean Copepod

Diversity ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 372
Author(s):  
Eun Hye Lee ◽  
Seo Yeol Choi ◽  
Min Ho Seo ◽  
Seok Ju Lee ◽  
Ho Young Soh
Keyword(s):  
Global Warming ◽  
Ocean Acidification ◽  
Atmospheric Carbon Dioxide ◽  
Egg Production ◽  
Hatching Success ◽  
Marine Animals ◽  
Ph Conditions ◽  
Effects Of Temperature ◽  
Egg Production Rate ◽  
Fresh Surface

The recent accelerated ocean acidification and global warming caused by increased atmospheric carbon dioxide may have an impact on the physiology and ecology of marine animals. This study was conducted to determine the egg production rate (EPR) and hatching success (EHS) of Acartia ohtsukai in response to the combined effects of an increase in temperature and a lower pH. Acartiaohtsukai with fresh surface seawater were collected in the northwestern Yeoja Bay of Korea in September 2017. The temperature and pH conditions applied included two different pH levels (representing the present: 7.9 and the future: 7.6) and three temperature values (26 °C, 28 °C, and 30 °C). In the pH 7.9, EPR significantly increased with increased temperature, but in pH 7.6, it significantly decreased as the temperature increased. EHS was lower in pH 7.6 than in pH 7.9. These results suggest that changes in the marine environment due to global warming and ocean acidification may affect Acartia populations and cause overall fluctuations in copepods of the genus Acartia.

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