. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. E 10 Time (mins) Figure 5. Temporal dynamics of egg release. Number of eggs per liter next to the spawning starfish is plotted on a logarithmic scale as a function of time since the start of spawning, for low, medium, and high current speeds. This trend was consistent for two of the current flow re- gimes (low m-s'1, medium m-s~'). In high flows ( m • s~'), the results were more er- ratic. Overall, a mean of 103 eggs 1 ' was recorded close to the starfish at the start of spawning, and total product
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. E 10 Time (mins) Figure 5. Temporal dynamics of egg release. Number of eggs per liter next to the spawning starfish is plotted on a logarithmic scale as a function of time since the start of spawning, for low, medium, and high current speeds. This trend was consistent for two of the current flow re- gimes (low m-s'1, medium m-s~'). In high flows ( m • s~'), the results were more er- ratic. Overall, a mean of 103 eggs 1 ' was recorded close to the starfish at the start of spawning, and total production over the mean spawning period of 45 min averaged X 104eggsr'. Measurements of egg concentrations adjacent to the starfish are more prone to experimental error in fast cur- rents, particularly with respect to accurate placement of the pump near the starfish, which may explain the smaller observed number of eggs at t = 0 during high flows (Fig. 5). In addition, as noted above, the number of eggs released by individual starfish varies considerably. The rate at which individual male starfish released sperm varied considerably, but no decline in the rate of E 10000 s i 100 Time (mins) Figure 6. Temporal dynamics of sperm release. Number of sperm per milliliter next to the spawning starfish is plotted on a logarithmic scale as a function of time since the start of spawning. Data were available only for slow currents and for up to 10 mm from the start of spawning. Low Medium High. Distance (m) Figure 7. Egg dispersion. Logarithmic plot of eggs per liter as a func- tion of distance from the spawning starfish, for low, medium, and high currents, expressed as a percentage of the number of eggs per liter at the spawning starfish. release was observed during the first 10 min after the start of spawning at low current flows, the period and condi- tions for which data were available (Fig. 6). A mean of 105 sperm ml"1 was recorded close to the starfish at the start of spawning,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
