. Il bollettino biologico. Biologia; Zoologia; biologia; biologia marina. HYDROMEDUSAN COMPORTAMENTO PHOTIC 303 Z 120 ^ CO 1 100 5 CO o Z LU ID O LU CL U. O Z CO 80 60 40 20. 1234 BELL ALTEZZA (cm) di figura 3. Media (± IO SE) numero di contrazioni di nuoto al minuto di varie dimensioni di P. penicillatus osservata durante la spontanea estesa combattimenti di nuoto sul tapis roulant. Una curva esponenziale (Y = 132.65 E-o.43x. r = o.96) è stato montato per la media delle frequenze di nuoto. Il più piccolo dei singoli utilizzati sono stati i primi otto e sedici tappe tentacolo. Ciascun mezzo rappresenta un singolo individuo. Risposta Shadow/rap

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDROMEDUSAN PHOTIC BEHAVIOR 303 Z 120 ^ CO 1 100 5 CO o Z LU ID O LU CL U. O Z CO 80 60 40 20. 1234 BELL HEIGHT (cm) FIGURE 3. Mean (± I SE) number of swimming contractions per minute of various sizes of P. penicillatus observed during spontaneous extended swimming bouts on the treadmill. An exponential curve (Y = 132.65 e-o.43x. r = o.96) has been fitted to the mean swimming frequencies. The smallest individuals used were early eight and sixteen tentacle stages. Each mean represents a single individual. Shadow response/rapid 100% shadows Medusae of all sizes tested (0.9-3.3 cm bell height) usually responded to rapid 100% shadows with one rapid swimming contraction, regardless of the absolute mag- nitude of the light intensity change (Table I). During the two minute pre-shadow period, most of the individuals did not swim and remained nearly motionless in the sink-fishing posture. Immediately after the brief shadow was presented, nearly all of these medusae responded with one swimming contraction. This single swimming con- traction did not lead to extended swimming bouts and medusae returned to their sink- fishing posture. For those medusae that were swimming during the pre-shadow period, the response to the shadow was one additional swimming contraction in its pre-shadow swimming frequency. There were no size-related differences in the response to the rapid shadows. Shadow response/spectral sensitivity All medusae consistently responded to shadows of monochromatic light between 450-575 nm (Fig. 5). Small medusae responded to a broad range of wavelengths with a peak response at 450 nm while the response range of larger medusae was compressed (failing to respond at 675 nm) and the peak response shifted to a slightly longer (550 nm) wavelength. These peaks and spectral distribution of the shadow response is similar to the spectral response of the electroretinogram (ERG) of P. penicillatus found by

Parole chiave associate all'immagine

• bookauthorlilliefrankrat
• booksubjectbiology
• booksubjectzoology