. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 254 R. A. BYRNE ET AL. CO CD (B > 10 mm. Emersion Period Figure I. An amalgamation of several recordings to demonstrate the four categories of valve movement behavior in emersed Corbicula tlumineti I. Valves closed. 2. Valves gaping slightly with little valve adduction, characteristic of mantle edge exposure. 3. Valves gaping wider with small medium frequency adductions, often associated with "ventilatory" movements. 4. Valves widely gaping with high frequency adductions indicative of the "escape" or &
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 254 R. A. BYRNE ET AL. CO CD (B > 10 mm. Emersion Period Figure I. An amalgamation of several recordings to demonstrate the four categories of valve movement behavior in emersed Corbicula tlumineti I. Valves closed. 2. Valves gaping slightly with little valve adduction, characteristic of mantle edge exposure. 3. Valves gaping wider with small medium frequency adductions, often associated with "ventilatory" movements. 4. Valves widely gaping with high frequency adductions indicative of the "escape" or "burrowing" behavior. the appearance of a form of "ventilation" (category 3 in Fig. 1). The fourth behavior (rare) was a parting of the valves, and an extension of the foot. While the foot was extended, the valves would shut on the foot, then open, and the foot would extend further. This behavior would be repeated until the foot was extended maximally and touching the substratum. This activity resembles the "burrowing" behavior of immersed specimens of C. fliiminen. and is interpreted as an escape behavior. Although the patterns of behavior varied extensively between clams, the general progression of valve move- ment behaviors was similar for all. It began with a period of valve closure which lasted from to h ( ± ; n = 4) at 15°C, from to h at 25°C ( ± ; n = 5), and [when valve movement behav- ior was noted (only 3 of 10 cases)] from to h at 35°C ( ± ; n = 3). After the initial period of valve closure, bouts of mantle edge exposure were occasionally interspersed with short periods of ventilatory and, rarely, burrowing behaviors. The duration of this period was variable, but ranged from to h ( ± ; n = 4) at 15°C. from to h at 25°C ( ± ; n = 5), and and h at 35°C (n = 2). Following the period of valve movement, the valves remain
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
