Cephalopods: Ecology and Fisheries by Peter Boyle, Paul Rodhouse

By Peter Boyle, Paul Rodhouse

Content material:
Chapter 1 creation (pages 1–6):
Chapter 2 shape and serve as (pages 7–35):
Chapter three foundation and Evolution (pages 36–49):
Chapter four Nautilus: The Survivor (pages 50–61):
Chapter five Biodiversity and Zoogeography (pages 62–79):
Chapter 6 lifestyles Cycle (pages 80–100):
Chapter 7 development (pages 101–115):
Chapter eight Physiological Ecology (pages 116–130):
Chapter nine replica (pages 131–145):
Chapter 10 From Egg to Recruitment (pages 146–160):
Chapter eleven Coastal and Shelf Species (pages 161–175):
Chapter 12 Oceanic and Deep?Sea Species (pages 176–204):
Chapter thirteen inhabitants Ecology (pages 205–221):
Chapter 14 Cephalopods as Predators (pages 222–233):
Chapter 15 Cephalopods as Prey (pages 234–258):
Chapter sixteen Fishing tools and clinical Sampling (pages 259–276):
Chapter 17 Fishery assets (pages 277–295):
Chapter 18 Fisheries Oceanography (pages 296–312):
Chapter 19 evaluate and administration (pages 313–334):
Chapter 20 end (pages 335–342):

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Additional info for Cephalopods: Ecology and Fisheries

Example text

The shell had a well-developed phragmocone with the siphuncle displaced towards the ventral surface, there was apparently no rostrum and there was a long pro-ostracum originating from about two-thirds of the diameter of the phragmocone. The phragmoteuthids had an ink sac, and arms bearing two rows of hooks. It is not known how they were orientated in the water, but without the calcified rostrum of the belemnites, their centre of buoyancy might have been towards the posterior, causing the long axis of the body to align vertically.

3 Chromatophores, iridophores and leucophores in the skin of Eledone cirrhosa viewed under different conditions of illumination. Chromatophores are controlled actively from the brain through direct innervation of their radiating muscles. They can be precisely controlled individually, or in groups (units) forming components of the overall pattern, and producing rapid and complex changes in the appearance of the animal by screening or revealing the underlying reflectors. Chromatophore patterns function to camouflage the individual against its background and as part of feeding and reproductive patterns of behaviour.

1 Cephalopods: Ecology and Fisheries Reconstruction of an early cephalopod (after Yochelson et al. 1973). of the body into the final chamber of the shell to displace water expelled for locomotion (see Chapter 4). The evolution of an elongated, buoyant phragmocone was necessarily followed by curvature of the shell, and ultimately coiling (Nautilus). This change in orientation shifted the centre of buoyancy, allowing the animal to float in a stable position beneath the phragmocone. The transition from a benthic to a nektonic existence, as the cephalopods evolved from their gastropod-type ancestors, placed demands on the respiratory system for more oxygen to support higher levels of activity.

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