. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 562 H. WATANABE AND C. C. LAMBERT TABLE 111 Larva release by Metandrocarpa taylori under natural illumination. The immature tadpole category includes all developmental stages incapable, of effective locomotion Illumination Duration Mature tadpoles Immature tadpoles Total '-. ii Night 84 hr 34 () 11 () 45 1 )av 35 hr 247 (; ) 17 ( ) 264 (07:00-12:00) Day 49 hr 39 () 16 (,) 55 (12:00-18:00) Total 168 hr 320 () 44 () 364 results of holding the colony under continuous darkne
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 562 H. WATANABE AND C. C. LAMBERT TABLE 111 Larva release by Metandrocarpa taylori under natural illumination. The immature tadpole category includes all developmental stages incapable, of effective locomotion Illumination Duration Mature tadpoles Immature tadpoles Total '-. ii Night 84 hr 34 () 11 () 45 1 )av 35 hr 247 (; ) 17 ( ) 264 (07:00-12:00) Day 49 hr 39 () 16 (,) 55 (12:00-18:00) Total 168 hr 320 () 44 () 364 results of holding the colony under continuous darkness for 43 hours, then exposing it to continuous light. Again, we see the massive larva release upon returning the colony to light. The number of larvae released on return to light seems to be related to the duration of the dark period (Table IV) with a clear tendency to release fewer immature stages after the longest dark periods. We then determined the minimal duration of exposure to light that would elicit larva release after a suitable dark period. Again, 15 minutes of exposure to light seems necessary for release even though some of the tadpoles were released after return to darkness. Larva release during long, continuous exposure to light or darkness is shown in Table V. Small numbers of larvae were irregularly released during both treat- ments. Again more larvae were released under illumination than darkness. More immature tadpoles were released during continuous light or dark than under natural or experimental dark-light cycles. o I cr UJ a. Q UJ c/1 o cr m 12- 1 1 - 10 9 7- 6- 5- 3- 2- 1 -. N M A 11 2 1968 N M M A 11 5 M A 11. 6 M A M A FIGURE 6. Larva release during 7 successive days of natural illumination by Metandrocarpa tuylori. The abbreviations are the same as in Figure Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
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