TEMPERATURE-DEPENDENT RATES OF LARVAL DEVELOPMENT IN

DANIEL CATALDO, DEMETRIO BOLTOVSKOY, JOSE L. HERMOSA, Y CARLA CANZY

JOURNAL OF MOLLUSCAN STUDIES

Año: 2005 vol. 71 p. 41 - 46

0260-1230

Laboratory-reared larvae of Limnoperna fortunei (Dunker) were monitored until the morula stage at 268C, and from there on until settlement at 20, 25 and 288C. The first polar lobe is produced c. 40 min after spawning, and the first division occurs 14 min later. Slightly over an hour after spawning, the second polar lobe appears and the second division yields a 4-cell stage. The third division occurs 90 min after spawning, and the fourth 115 min after spawning. The morula stage is reached 3.5 h after spawning. The trochophore stage (size: 95–110mm) is reached 20, 6.3 and 6 h after spawning at 20, 25 and 288C, respectively. Straight-hinged veligers (115–175mm) start appearing at 45, 26, and 24 h after spawning; umboned veligers (156–220mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.Limnoperna fortunei (Dunker) were monitored until the morula stage at 268C, and from there on until settlement at 20, 25 and 288C. The first polar lobe is produced c. 40 min after spawning, and the first division occurs 14 min later. Slightly over an hour after spawning, the second polar lobe appears and the second division yields a 4-cell stage. The third division occurs 90 min after spawning, and the fourth 115 min after spawning. The morula stage is reached 3.5 h after spawning. The trochophore stage (size: 95–110mm) is reached 20, 6.3 and 6 h after spawning at 20, 25 and 288C, respectively. Straight-hinged veligers (115–175mm) start appearing at 45, 26, and 24 h after spawning; umboned veligers (156–220mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.8C. The first polar lobe is produced c. 40 min after spawning, and the first division occurs 14 min later. Slightly over an hour after spawning, the second polar lobe appears and the second division yields a 4-cell stage. The third division occurs 90 min after spawning, and the fourth 115 min after spawning. The morula stage is reached 3.5 h after spawning. The trochophore stage (size: 95–110mm) is reached 20, 6.3 and 6 h after spawning at 20, 25 and 288C, respectively. Straight-hinged veligers (115–175mm) start appearing at 45, 26, and 24 h after spawning; umboned veligers (156–220mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.mm) is reached 20, 6.3 and 6 h after spawning at 20, 25 and 288C, respectively. Straight-hinged veligers (115–175mm) start appearing at 45, 26, and 24 h after spawning; umboned veligers (156–220mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.mm) start appearing at 45, 26, and 24 h after spawning; umboned veligers (156–220mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.mm) at 287, 165 and 118 h after spawning; and pediveligers (.200 mm) at 480, 313 and 265 h after spawning. Implications of these findings for the dispersion of the species and for its fouling impact are discussed.