scholarly journals Models of temperature-dependent rate of development of pilchardSardinops sagaxeggs, to be used in routine procedures for estimating daily egg production

1995 ◽  
Vol 16 (1) ◽  
pp. 1-8 ◽  
Author(s):  
F. Le Clus ◽  
P. E. Malan
Keyword(s):  
Egg Production ◽  
Temperature Dependent ◽  
Rate Of Development ◽  
Dependent Rate ◽  
Routine Procedures

RATE OF DEVELOPMENT, REPRODUCTION, AND MASS-REARING OF APANTELES FUMIFERANAE VIER. (HYMENOPTERA: BRACONIDAE) UNDER CONTROLLED CONDITIONS

1988 ◽  
Vol 120 (3) ◽  
pp. 197-204 ◽  
Author(s):  
V.G. Nealis ◽  
S. Fraser
Keyword(s):  
Mass Rearing ◽  
Light Conditions ◽  
Degree Days ◽  
Temperature Dependent ◽  
Rate Of Development ◽  
Complete Development ◽  
Dependent Rate ◽  
Controlled Conditions ◽  
Daily Rate ◽  
Adult Wasp

AbstractThe temperature-dependent rate of development of the post-diapause larval and pupal stages of the spruce budworm parasitoid, Apanteles fumiferanae Vier., was estimated under controlled conditions. Parasitoid larvae required 289.0 degree-days (DD) above a threshold of 8.1 °C to complete development and the pupae required 106.2 DD above a threshold of 9.6 °C to complete development. Longevity of the adult wasp at several temperatures also was examined. Female wasps lived longer than male wasps at all temperatures. Wasps tended to mate more readily under natural than under artificial light conditions.Newly emerged female A. fumiferanae had few, if any, mature eggs in their ovaries. The number of mature eggs increased to a peak of 40–75 eggs, 4–12 days after eclosion of the adult. The pattern in number of ovipositions was similar to this pattern of egg availability. The daily rate of oviposition, however, was only about one-quarter the number of eggs available.These biological measurements are discussed in view of the development of a mass-rearing technique for this parasitoid.

Temperature dependent rate coefficients for the reaction of OH radicals with dimethylbenzoquinones

2015 ◽  
Vol 639 ◽  
pp. 145-150 ◽  
Author(s):  
Iustinian Bejan ◽  
Ian Barnes ◽  
Peter Wiesen ◽  
John C. Wenger
Keyword(s):  
Rate Coefficients ◽  
Oh Radicals ◽  
Temperature Dependent ◽  
Dependent Rate

Gas-phase ozonolysis of β-ocimene: Temperature dependent rate coefficients and product distribution

2016 ◽  
Vol 147 ◽  
pp. 46-54 ◽  
Author(s):  
Elizabeth Gaona-Colmán ◽  
María B. Blanco ◽  
Ian Barnes ◽  
Mariano A. Teruel
Keyword(s):  
Gas Phase ◽  
Product Distribution ◽  
Rate Coefficients ◽  
Temperature Dependent ◽  
Dependent Rate

Temperature-dependent survival and reproduction within populations of the ectoparasitic digenean Transversotrema patialense on the fish host

Parasitology ◽  
1980 ◽  
Vol 81 (1) ◽  
pp. 91-102 ◽  
Author(s):  
C. A. Mills
Keyword(s):  
Life Span ◽  
Egg Production ◽  
Fish Host ◽  
Adult Parasite ◽  
Optimum Temperature ◽  
Brachydanio Rerio ◽  
Temperature Dependent ◽  
Parasite Survival ◽  
Survival And Reproduction ◽  
Increasing Temperature

SUMMARYThe reproduction and survival of the ectoparasitic digenean Transversotrema patialense on the fish host Brachydanio rerio are shown to be temperature-dependent. Survival is reduced by any deviation from an optimum temperature of approximately 23°C. With increasing temperature the rate of egg production per surviving fluke rises progressively faster to a higher peak up to 29°C but falls to zero by 35°C. The span of egg production varies closely with the life-span of the parasite at each temperature. The optimum temperature for the total number of eggs produced by each cohort of parasites is also 23°C. This number is a function of both adult parasite survival and the rate of egg output.

Temperature‐dependent rate coefficients for the gas‐phase OH + furan‐2,5‐dione (C 4 H 2 O 3 , maleic anhydride) reaction

2020 ◽  
Vol 52 (10) ◽  
pp. 623-631 ◽  
Author(s):  
Aparajeo Chattopadhyay ◽  
Vassileios C. Papadimitriou ◽  
Paul Marshall ◽  
James B. Burkholder
Keyword(s):  
Maleic Anhydride ◽  
Gas Phase ◽  
Rate Coefficients ◽  
Temperature Dependent ◽  
Dependent Rate

The reproductive biology and ecology of Gammarus duebeni (Crustacea: Amphipoda) in southern England

1983 ◽  
Vol 63 (3) ◽  
pp. 517-540 ◽  
Author(s):  
Martin Sheader
Keyword(s):  
Life Cycle ◽  
Egg Production ◽  
Breeding Strategy ◽  
Female Size ◽  
Temperature Dependent ◽  
Southern Limit ◽  
Factors Affecting ◽  
North East ◽  
The North ◽  
Test Estuary

A study was made of the life cycle and reproductive ecology of Gammarus duebeni in the Test Estuary on the south coast of England. The species is towards the southern limit of its distributional range in the north-east Atlantic, which results in breeding continuing throughout much of the year. The breeding strategy employed was found to vary with season. The size of eggs produced and the rate of egg production were both temperature dependent, whereas the proportion of production expended on eggs and the number of eggs per brood, although probably influenced by temperature appeared to be controlled by food availability and female size. Factors affecting the mortality of eggs within the marsupium and breeding synchrony were considered in relation to season. The life cycle consisted of two major overlapping generations.

Ecology of Pseudodiaptomus annandalei in tropical aquaculture ponds with emphasis on the limitation of production

2019 ◽  
Vol 41 (5) ◽  
pp. 741-758 ◽  
Author(s):  
Josephine GrØnning ◽  
Nam X Doan ◽  
Nguyet T Dinh ◽  
Khuong V Dinh ◽  
Torkel Gissel Nielsen
Keyword(s):  
Production Rate ◽  
Egg Production ◽  
Fecal Pellet ◽  
Temperature Dependent ◽  
Egg Hatching ◽  
Pellet Production ◽  
Live Feed ◽  
Egg Production Rate ◽  
Tropical Aquaculture

ABSTRACT The calanoid copepod Pseudodiaptomus annandalei is used as live feed in aquaculture because of its nutritional value and the ability to cope with environmental fluctuations in outdoor ponds. However, little knowledge exists on its ecology. Here we investigated the ecology of P. annandalei in an aquaculture pond in Vietnam. Temperature, salinity, chlorophyll a and biomass of protozoans and copepods were monitored every other day for 1 month. Experiments on protozoan growth and grazing by P. annandalei were also conducted. Copepod fecal pellet production and temperature-dependent egg hatching rates were likewise quantified. Despite very high phytoplankton biomass, biomass of P. annandalei was surprisingly low. Copepod production was estimated from three independent methods: clearance, weight-specific egg production rate (SEP) and specific fecal pellet production rate. SEP proved to be accurate to predict the in situ population growth in the pond. A simple model for production of P. annandalei based on SEP was developed. Our study extends our knowledge of how environmental conditions in the pond may affect the population dynamics and production of copepods. The results have important implications for pond managements ensuring stable copepod production and harvest.

scholarly journals Population viability at extreme sex-ratio skews produced by temperature-dependent sex determination

2017 ◽  
Vol 284 (1848) ◽  
pp. 20162576 ◽  
Author(s):  
Graeme C. Hays ◽  
Antonios D. Mazaris ◽  
Gail Schofield ◽  
Jacques-Olivier Laloë
Keyword(s):  
Sex Determination ◽  
High Mortality ◽  
Egg Production ◽  
Incubation Temperature ◽  
Sea Turtles ◽  
Sex Ratios ◽  
Population Viability ◽  
Temperature Dependent ◽  
Population Extinction ◽  
The World

For species with temperature-dependent sex determination (TSD) there is the fear that rising temperatures may lead to single-sex populations and population extinction. We show that for sea turtles, a major group exhibiting TSD, these concerns are currently unfounded but may become important under extreme climate warming scenarios. We show how highly female-biased sex ratios in developing eggs translate into much more balanced operational sex ratios so that adult male numbers in populations around the world are unlikely to be limiting. Rather than reducing population viability, female-biased offspring sex ratios may, to some extent, help population growth by increasing the number of breeding females and hence egg production. For rookeries across the world ( n = 75 sites for seven species), we show that extreme female-biased hatchling sex ratios do not compromise population size and are the norm, with a tendency for populations to maximize the number of female hatchlings. Only at extremely high incubation temperature does high mortality within developing clutches threaten sea turtles. Our work shows how TSD itself is a robust strategy up to a point, but eventually high mortality and female-only hatchling production will cause extinction if incubation conditions warm considerably in the future.

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