The rate of development in poikilothermic animals calculated in astronomical and relative time units

Variation in and among early life history traits of laboratory-reared winter flounder Pseudo-pleuronectes americanus

“…We found that the (e.g. see Dettlaff 1986) and may account for the low variation observed by Laurence et al at the termination variance in ages (and sizes) at hatching. Ryland (1966) of their experiment was smaller than that to be found that developmental timing was canalized expected even under strict truncation selection, an through yolk-sac absorption (Ryland's stage 2a) in extreme and unlikely form of size-specific mortality European plaice, but developmental variation through whlch the smallest (or largest) 23% of the increased markedly during their switch to exogenous larvae would be systematically removed.…”

Temperature-dependent Index of Mitotic Interval (τ0) for Chromosome Manipulation in Korean Rose Bitterling Rhodeus uyekii

“…The Dettlaff unit is the duration in minutes of one mitotic cycle during early synchronous embryonic cleavage, or the interval between two consecutive cell divisions (Saat and Veersalu, 1996a;Shelton et al, 1997). When measured over a range of temperatures, the relationship of τ 0 to temperature as determined by regression analysis can be used to predict developmental events that are influenced by temperature within a single species and between species with similar spawning biology (Dettlaff, 1986). To date, mitotic intervals (τ 0 ) have been used to estimate the optimal times for chromosome manipulation in a variety of species such as the paddlefish Polyodon spathula, shovelnose sturgeon Scaphirhynchus platorynchus, common carp Cyprinus carpio, tench Tinca tinca, Black plaice Pleuronectes obscures, and black crappie Pomoxis nigromaculatus (Flajšhans et al, 1993;Shelton and Rothbard, 1993;Mims et al, 1997;Shelton et al, 1997;Gomelsky et al, 2000;Park and Im, 2010).…”

Temperature-dependent index of mitotic interval τ0 in greenling Hexagrammos otakii

“…The Dettlaff unit is the duration in minutes of one mitotic cycle during early synchronous embryonic cleavage, or the interval between two consecutive cell divisions 12,13 . When measured over a range of temperatures, the relationship between τ 0 and temperature as determined by regression analysis can predict the developmental events that are influenced by temperature within a species, and between species with a similar spawning biology 14 …”

“…12,13 When measured over a range of temperatures, the relationship between τ 0 and temperature as determined by regression analysis can predict the developmental events that are influenced by temperature within a species, and between species with a similar spawning biology. 14 To date, mitotic intervals (τ 0 ) have been used to estimate the optimal times for chromosome manipulation in a variety of species such as the paddlefish 13,[15][16][17][18][19][20][21] In our laboratories, τ 0 was found to be useful for optimizing the time for chromosome manipulations in the greenling and other species. 9 This study was carried out to establish effective procedures for chromosome manipulation in greenling, which has enormous aquacultural potential.…”