Control of ventilatory movements in the aquatic insect Corydalus comutus: central effect of hypoxia

Physiological Entomology - Tập 9 Số 1 - Trang 19-28 - 1984
Sue C. Kinnamon1, Ann E. Kammer1, A L Kiorpes2
1Division of Biology, Kansas State University, Manhattan
2Department of Anatomy and Physiology, Kansas State University, Manhattan

Tóm tắt

ABSTRACT. The influence of hypoxia and hypercapnia on the ventilatory rhythm of the hellgrammite Corydalus cornutus L. (Megaloptera) was studied. In intact animals the frequency of rhythmic retractions and protractions of abdominal gills is increased by hypoxia (10% O2, 90% N2) but no ventilatory response is elicited by hypercapnia (1–5% CO2, 20% O2, 75–79% N2).The ventilatory motor pattern was examined by recording extracellularly from the gill retractor muscle or its efferent nerve. In response to hypoxia (8% 02, 92% N2), there are decreases in the cycle‐time, the interspike interval, and the burst length of the gill retractor motorneuron. In addition, previously quiescent motorneurons associated with gill protraction are recruited.Individual ganglia or small groups of abdominal ganglia can be isolated both from the central ganglionic chain and from the periphery by selective cutting of roots and connectives. When exposed to hypoxia, preparations that include the first abdominal ganglion show characteristic changes in the ventilatory motor pattern similar to those in intact animals. Thus sensitivity to oxygen appears to be located centrally and not peripherally. In small animals (head width < 7 mm), abdominal ganglia 2–3 and 2–7 respond characteristically to hypoxia, but in larger animals (head width > 9 mm), chains of ganglia lacking abdominal ganglion 1 fail to respond. In larger animals oxygen sensitivity may thus be concentrated in abdominal ganglion 1, whereas in smaller animals the ability to initiate a ventilatory response to hypoxia is distributed among the abdominal ganglia.

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Tài liệu tham khảo

10.2307/1540449

10.1098/rstb.1974.0040

Burrows M., 1982, Interneurons co‐ordinating the ventilatory movements of the thoracic spiracles in the locust, Journal of Experimental Biology, 97, 385, 10.1242/jeb.97.1.385

Crabtree R.L., 1974, Oxygen‐sensitive elements in the book gills of Limutus polyphemus, Journal of Experimental Biology, 60, 631, 10.1242/jeb.60.3.631

10.1007/BF00619157

Ksars G., 1981, Locomotion and Energetics in Arthropods, 337

10.1111/j.1365-3032.1982.tb00288.x

Kinnamon S.C., 1981, Segmental distribution of ventilator) control mechanisms in an aquatic insect, Society for Neuroscience Abstracts, 7, 411

Kinnamon S.C.L Kammer A.E.(1983)Neural control of ventilatory movements in the aquatic insect Corydalus comutus: the motor pattern.Journal of Comparative Physiology in press.

Kinnamon S.C., 1980, Control of ventilation in an aquatic insect larva: central effect of hypoxia, American Zoologist, 20, 942

Lewis G.W., 1973, Neuromuscular mechanisms of abdominal pumping in the locust, Journal of Experimental Biology, 59, 149, 10.1242/jeb.59.1.149

Massabuau J.C. Echlancher B. & Dejours P.

Kiorpes, 1979, Ventilatory reflex response to oxygen changes in crayfish, International Research Communication System, Medical Science-Library Compendium, 7, 614

10.1242/jeb.62.3.637

10.1016/B978-0-12-591606-6.50013-6

10.1007/978-1-4684-6967-7_12

10.1016/0022-1910(61)90053-1

Miller P.L., 1964, Factors altering spiracle control in adult dragonflies: hypoxia and temperature, Journal of Experimental Biology, 41, 345, 10.1242/jeb.41.2.345

10.1016/B978-0-12-591606-6.50012-4

10.2307/1540015

10.1016/0006-8993(80)90453-9

10.1007/BF00611880

Wyse C.A., 1976, Sensory and central nervous control of gill ventilation in Limulus, Federation Proceedings, 35, 2007

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Physiological Entomology

Tập 9 Số 1

19-28

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