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Seasonal changes in body size and oil sac volume of three planktonic copepods, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, in a temperate embayment: what controls their seasonality?
In: CrustaceanaSeasonal changes in body size (prosome length: PL) and oil sac volume (OSV) of the three most numerically abundant copepods in Ishikari Bay, northern Sea of Japan, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, were studied using monthly samples collected through vertical hauls of a 100-μm mesh NORPAC net from March, 2001 to May, 2002. Seasonal changes in PL were common for the three species and were more pronounced during a cold spring. PL was negatively correlated with temperature, and this relationship was described well using the Bělehrádek equation. Seasonal changes in OSV exhibited a species-specific pattern, i.e., OSV was greater during a warm summer for P. parvus and was greater during a cold spring for P. newmani and O. similis. The OSV peak period corresponded with the optimal thermal season of each species. The relative OSV to prosome volume of the small copepods (0.6-0.8%) was substantially lower than that of the large copepods (20-32%). These facts suggest that the oil sac of small copepods is not used for overwintering or diapauses or during periods of food scarcity, but is instead used as the primary energy source for reproduction, which occurs during the optimum thermal season of each species.
Les variations saisonnières de la taille du corps (longueur du prosome: PL) et du volume du sac à huile (OSV) chez les trois copépodes les plus abondants numériquement dans la baie de Ishikari, au nord de la Mer du Japon, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 et Oithona similis Claus, 1866, ont été étudiés à partir d’échantillons mensuels collectés par des traits verticaux de filet NORPAC de 100 μm de vide de maille de mars 2001 à mai 2002. Les changements saisonniers de PL étaient les mêmes pour les trois espèces et étaient plus prononcés lors d’un printemps froid. PL était corrélée négativement à la température, et cette relation a été bien décrite avec l’équation de Bělehrádek. Les changements saisonniers de OSV ont montré un pattern spécifique de l’espèce, c’est-à-dire un OSV plus élevé au cours d’un été chaud pour P. parvus et plus élevé lors d’un printemps froid chez P. newmani et O. similis. La période de pic de OSV correspond à la saison de température optimale de l’eau de chaque espèce. Le rapport OSV / volume du prosome des petits copépodes (0,6-0,8%) était sensiblement inférieur à celui des grands copépodes (20-32%). Ces faits suggèrent que le sac à huile des copépodes de petite taille n’est pas utilisé lors de l’hivernage ou des diapauses ou pendant les périodes de rareté de nourriture, mais est utilisé plutôt comme la source d’énergie primaire pour la reproduction, qui intervient à la saison d’optimum thermique de chaque espèce.
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Seasonal changes in body size and oil sac volume of three planktonic copepods, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, in a temperate embayment: what controls their seasonality?
In: CrustaceanaSeasonal changes in body size (prosome length: PL) and oil sac volume (OSV) of the three most numerically abundant copepods in Ishikari Bay, northern Sea of Japan, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, were studied using monthly samples collected through vertical hauls of a 100-μm mesh NORPAC net from March, 2001 to May, 2002. Seasonal changes in PL were common for the three species and were more pronounced during a cold spring. PL was negatively correlated with temperature, and this relationship was described well using the Bělehrádek equation. Seasonal changes in OSV exhibited a species-specific pattern, i.e., OSV was greater during a warm summer for P. parvus and was greater during a cold spring for P. newmani and O. similis. The OSV peak period corresponded with the optimal thermal season of each species. The relative OSV to prosome volume of the small copepods (0.6-0.8%) was substantially lower than that of the large copepods (20-32%). These facts suggest that the oil sac of small copepods is not used for overwintering or diapauses or during periods of food scarcity, but is instead used as the primary energy source for reproduction, which occurs during the optimum thermal season of each species.
| All Time | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 449 | 35 | 4 |
| Full Text Views | 147 | 1 | 1 |
| PDF Views & Downloads | 15 | 2 | 2 |