V. B. Meyer-Rochow; K M. Tiang:

The eye of Jasus Edwardsii (Crustacea, Decapoda, Palinuridae)

Electrophysiology, histology and behaviour

1984. IV, 61 pages, 20 figures, 24 plates, 23x30cm, 450 g
Language: English

(Zoologica, Heft 134)

ISBN 978-3-510-55020-3, paperback, price: 40.00 €

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Content Description top ↑

In this investigation, structural and functional responses of eyes of adult Jasus edwardsii to various light stimuli were studied. Jasus edwardsii is a New Zealand rock lobster which inhabits the coastal sublittoral down to a depth of at least 50 m. He prefers a rocky or stony substrate to a sandy one, for it likes to rest or hide during the day in a dark shelter.

Table of Contents top ↑

I. Introduction l
A. Habitat and environmental light conditions l
B. Conditions on rock lobster boats 2
C. The compound eye of a nocturnal arthropod 2
D. Structure and function of lobster and crayfish eyes 3
E. Aim of present study 5
II. Capture and Maintenance of Rock Lobsters 6
III. Histology 7
A. Introduction 7
B. Materials and methods 7
C. Results 8
a) Structural organisation 8
l . General features of the eye 8
2 Dioptric apparatus 9
3. Photoreceptor cells lO
4. Proximal screening pigments and reflector layer 10
5. Retinula cell organelles and alien cell inclusions l l
b) Dark/light adaptational changes 12
1. Normal, diurnal changes 12
2. Changes caused by prolonged darkness l3
3. The effects of exposure to intense light 13
4. Changes caused by prolonged exposure to moderately bright light 14
c) Effects of exposure to spectral lights of equal photon content 14
IV. Electrophysiology 16
A. Introduction 16
B. Materials and methods 16
C. Results 17
a) Relationship between stimulus and response 17
1. Wave forms l7
2. Intensity functions and diurnal sensitivity changes 18
3. Circadian rhythm 2O
4. Flicker fusion frequency 20
5. Effects of bright light stimulation on sensitivity 2O
6. Prolonged exposure to light 21
7. Exposure to spectral lights for two hours 24
b) Spectral sensitivity 25
V. Biochemistry of Rock Lobster Vision and Spectrophotometric Observations 28
A. Introduction 28
B. Methods and results 28
C. Discussion 30
VI. Behavioural Observations 32
A. Introduction 32
B. Visual behaviour in the field 32
C. Behaviour of rock lobster in direct sunlight 34
D. Visual behaviour of unilaterally exposed animal 35
VII. Observations on Eye-Glow 36
A. Introduction 36
B. Results 36
VIII. Discussion 38
A. The eye of Jasus edwardsii as a specialized dim-light receptor 38
1. Morphological considerations 38
2. Anatomical considerations 38
3. The eyes of Jasus and Panulirus - a comparison 39
B. Functional aspects of the eye of Jasus edwardsii 40
1. The roles of dioptric and catoptric elements 4O
2. Biochemical and neuronal adaptation 40
3. Facilitation and flicker fusion frequency 41
4. Spectral responsiveness 41
C. Light-induced sensitivity loss and rhabdom breakdown 42
1 . Circadian oscillations and prolonged exposure to light or darkness 42
2. Light-triggered membrane events 42
3. Exposure to spectral lights of equal photon content 43
4. Effects of oxygen and temperature 44
D. Rock lobster vision: normal and impaired 44
1 . The situation in the field 44
2. The effects of impaired vision 45
E. Conclusion 45
IX. Summary 47
X. Acknowledgements 48
References 49
Plate — Legends 58
Plates 1—24