Development and growth of ontogenetically migrating copepods during the spring phytoplankton bloom in the Oyashio region

An alternative kernel-based method for estimating copepod growth rates from multimodal biomass distributions in artificial cohort experiments

“…If there were no possible corresponding BW peaks after incubation (i.e., the inevitability of missed individuals after a stage transition), that BW peak before incubation would not be considered in the calculation. Second, samples must be discarded in traditional enumeration if sieving problems (leakage or clogging, e.g., Kobari et al 2010) lead to contamination; otherwise, an abnormal distribution of biomass will result in a potential bias or higher variability in growth rate values (Kimmerer et al 2007). By applying the multiple-peak consideration, the contamination effect was minimized because BW values of a low frequency are not considered when calculating the growth rate.…”

“…Such an issue is particularly problematic in subtropical and tropical environments where copepod communities are complex and diverse (e.g., Hsieh et al 2005;Tseng et al 2008). Furthermore, contamination from imperfect sieving or clogging by algae (Kimmerer et al 2007;Kobari et al 2010) can further exacerbate this situation, especially in tropical and subtropical environments where surface waters are often overgrown by microalgae (McKinnon 1996). Under such circumstances, growth rates calculated with simple average biomass values may be biased by the frequency difference between assemblages before and after incubation.…”

What Factors Influence Body Size Variations and Egg Production of Copepods and Artemia in the Saltern of Sfax?

“…Laboratory investigations have shown that temperature and food availability are the principal factors controlling the dynamic, growth and reproduction of copepod population (Kobari et al 2010). In fact, Kobari and Ikeda (2001a, b) that body size variations result from a combined effect of these two factors.…”

Nucleic acid ratio as a proxy for starvation of coastal and pelagic copepods in the North Pacific Ocean

“…For the last half century, a great deal of effort has been dedicated to increasing knowledge on zooplankton growth, estimated by techniques such as frequent field sampling (e.g., Heinle 1966, Liang et al 1996, Kobari et al 2010) and ship-board or laboratory incubations (e.g., Burkill & Kendall 1982, Kimmerer & McKinnon 1987, Berggreen et al 1988). On the other hand, zooplankton mortality is difficult to estimate due to the population variables being strongly influenced by the diffusion and advection of water masses (field sampling) and difficulty excluding predators in the incubation techniques (see Hirst & Kiørboe 2002).…”