Life History and Distributional Studies on Eubranchipus serratus Forbes (1876)

Dexter, Ralph W.; Ferguson, M. S.

doi:10.2307/2420993

Cited by 22 publications

(8 citation statements)

References 3 publications

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“…As to hatching, the events in the pool and in the pond showed that the species responds not to a single but to combined stimuli, as suspected in other species (Brown & Carpelan, 1971) . Moreover, dessiccation is not a pre-requisite for development, in line with previous results (Lowndes, 1993 ;Castle, 1938 ;Avery, 1939 ;Dexter & Ferguson, 1943 ;Hall, 1953Hall, , 1961Prophet, 1963 ;Broch, 1965 ;Mitchell, 1990) . Both assumptions receive further support from the hatching pattern in the pond : nauplii predictably appear after thawing, as soon as temperature reaches suitable values, and in autumn after dilution by the first summer rains .…”

Section: Discussionsupporting

confidence: 91%

Observations on the biology of the rare Branchipus visnyai Kertesz 1956 (Crustacea, Anostraca) from Monti Reatini (Latim, central Italy)

Mura

1996

Hydrobiologia

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Branchipus visnyai is presently known from only one location, in Italy, on Monte Catabio (central Appennine, Latium, 1590 m a.s .l) . It lives in a large astatic pond and in a small temporary pool close to the pond . Typically two generations appear in the pond (in spring after snowmelt and in autumn after dilution by rainfall), unless an exceptionally dry season occurs . Yet, due to shallowness and small size, filling and duration of the pool is erratic and depends on the annual amount of snow and rainfall . Consequently, B. visnyai does not always appear in the pool .Field studies suggest that either a rise in temperature or a drop in conductivity may trigger cyst hatching in the two biotopes . Also, the species exhibits a high tolerance to change in environmental factors like water temperature . Hatching occurs within a range of 10-22 °C, adults survive at temperatures from 1 to 27°C . The optimum seems to correspond to 10-20 °C .

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Section: Discussionsupporting

confidence: 91%

Observations on the biology of the rare Branchipus visnyai Kertesz 1956 (Crustacea, Anostraca) from Monti Reatini (Latim, central Italy)

Mura

1996

Hydrobiologia

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“…There was no evidence. in any year of the triphasic growth curve deduced by White (1967) for B. gigas and B. mackini, and by other workers for species of Eubranchipus (Dexter and Ferguson 1943, Coopey 1950, Dexter and Kuehnle 1951 and Streptocephalus seali (Moore 1955). In these studies, it appeared that growth was temporarily retarded at the time that eggs were first extruded into the egg sac, and was subsequently resumed after the first clutch had been fully developed.…”

Section: Discussionmentioning

confidence: 76%

Life History and Energy Relations of the Giant Fairy Shrimp Branchinecta gigas Lynch 1937 (Crustacea: Anostraca)

Daborn

1975

Ecology

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The life cycle and energy relations of the giant fairy shrimp, Branchinecta gigas Lynch, in a turbid, aestival lake in western Canada are described for 1972. Hatching of overwintered eggs began when lake sediments thawed in April, at which time salinity was low as a result of snow runoff; hatching ceased after a few days as salt deposits redissolved and salinity of the water incresed. The population, being of almost uniform age, was treated as a single cohort. Larval and post—larval growth in length followed a sigmoid pattern that could be well described by a logistic curve. Maximum growth rates occurring at 3—4 wk of age were 2.54 mm/day for ♂ ♂ and 2.95 mm/day for ♀ ♀, representing daily length increments of 11.3% and 10.3%, respectively. Corresponding max dry weight increases were 33% of body weight per day in each case. Average max lengths of 47.7 mm for ♂ ♂ and 60.6 mm for ♀ ♀ were attained at ages of 40—45 days; max longevity was 60 days. The species is exclusively predaceous for most of its life cycle, feeding primarily upon Branchinecta mackini and Diaptomus nevadensis. Females were estimated to produce three clutches of eggs, with clutch size being proportional to total body length of the ♂, and average fecundity in 1972 was calculated at 630 eggs. Measurements of feeding rate and O2 consumption were made over 24—h periods in the lake and an energy budget was cosntructed for most of the life cycle (46 days) on the basis of logistic growth curves fitted to field data. Males assimilated 67% and ♂ ♂ 94% of ingested food, investing 23% and 22% of assimilated energy, respectively, in somatic growth. Molting losses were estimated at 5%—6%, and an extreme estimate of 14% was calcualted to represent nitrogen excretion, on the assumption of strictly carbohydrate and lipid—based metabolism. Maintenance costs were estimated at 58% in ♂ ♂ and 47% ♀ ♀. The difference (11.3%) corresponded precisely to the costs of egg production.

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“…After maturation, growth resumes and then slows as maximum size is reached, according to studies of Dexter and Ferguson ( 1943) , Coopey (1950), and Moore (1963). An estimate of subsequent hatches was made from the growth rate of the initial hatch, using the largest immature individual collected on a given day, taking 10 mm as the usual size at first maturity.…”

Section: Field Methodsmentioning

confidence: 99%

Egg Hatching and Life History of a Fairy Shrimp Branchinecta Mackini Dexter (Crustacea: Anostraca) in a Mohave Desert Playa (Rabbit Dry Lake)

Brown¹,

Carpelan²

1971

Ecology

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Observations on populations of Branchinecta mackini in temporary ponds, which last for as little as 3 days to as long as 4 months, on a desert playa showed that hatching of dehydrated cysts (eggs) follows initial entry of water into the basin if salinity remains low.Salinity ranges from an initial 0.5%o to as much as 34%o as the pond evaporates. Hatching is continuous at constant low salinity, but since salinity generally increases rapidly, initial hatch is usually of short duration. Additional periods of hatching follow further inflows of water or after melting of ice, that is, after reductions in salinity. The duration of hatching is inversely proportional to rate of increase in salinity. When salinity of small-volume summer ponds increases at rates above 500 ppm (1,000 !J.mhos) per day, there is virtual inhibition of hatching.Laboratory studies showed that egg hatching was controlled by both salinity and oxygen operating in various combinations to inhibit or stimulate hatch. The hatching characteristics of desiccated eggs collected from the dried mud of the lake basin differed from non-dried eggs obtained from laboratory cultures after ejection from ovisacs of living females.The finding that a salinity-oxygen complex regulates hatching in a desert pond permits tentative explanation of a difference between branchiopods of humid and arid regions. In both cases the branchiopods are characteristic of astatic waters, and stimulation of the egg to hatch must be by some factor that changes at the time of origin of the temporary pond. In humid regions the factors of concern are temperature and oxygen. If the water undergoes significant changes in salinity, as it does in arid regions, control of egg hatch may be by both salinity and oxygen, with temperature limited to control of rate of development.

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Life History and Distributional Studies on Eubranchipus serratus Forbes (1876)

Cited by 22 publications

References 3 publications

Observations on the biology of the rare Branchipus visnyai Kertesz 1956 (Crustacea, Anostraca) from Monti Reatini (Latim, central Italy)

Observations on the biology of the rare Branchipus visnyai Kertesz 1956 (Crustacea, Anostraca) from Monti Reatini (Latim, central Italy)

Life History and Energy Relations of the Giant Fairy Shrimp Branchinecta gigas Lynch 1937 (Crustacea: Anostraca)

Egg Hatching and Life History of a Fairy Shrimp Branchinecta Mackini Dexter (Crustacea: Anostraca) in a Mohave Desert Playa (Rabbit Dry Lake)

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