Animals

The House Mouse: Atlas of Embryonic Development by Karl Theiler, Heiner Westphal

By Karl Theiler, Heiner Westphal

With the appearance of transgenic know-how, which permits the identity of particular gene actions in constructing mammalian organisms, the home mouse has once more taken an important position in experimental study as one of many genetically most sensible understood mammals. greater than ever, molecular biologists are short of a close, standardized description of the anatomy of the constructing mouse embryo. during this vintage compendium, now mentioned up to now and corrected, the writer provides each one degree of mouse improvement in pictures and micrographs utilizing hybrids of 2 inbred traces as a regular. Organ platforms are systematically reconstructed from fertilization till after start. Molecular biologists tracing the results of genetic manipulations, in addition to scholars and researchers of developmental biology, will enjoy the renewed availability of this normal reference paintings for its exceptional accuracy, its cognizance to anatomical element, and the level of its documentation.

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The eggs are incubated in the female’s pouch and hatch after 10 or 11 days. The lactation period for platypuses is about 19 weeks, but for echidnas there are large differences between populations from different parts of Australia: in eastern Australian echidnas the lactation period may be as little as 20 weeks, and in Western Australian and Kangaroo Island as much as 30 weeks. There are also differences in other aspects of maternal care between these echidna populations. All the monotremes have low metabolic rates, but echidna metabolic rates are extremely low, and shortbeaked echidnas in cooler areas show long periods of hibernation.

He described a range of behavioural postures and social behaviour patterns, and dominance hierarchies. ‘Much of the dominance-subordinance relationships between echidnas is resolved by the subordinate individual recognising some dominance feature (apparently size) of another and avoiding any contact with the dominant animal’ (Brattstrom 1973). He concluded that: ‘Many complicated behavioural postures such as grooming, aggression, courtship, and maternal behaviour are missing in the echidna. The echidna thus seems to have a behaviour that is not only 2 – Behaviour and ecology of monotremes simpler than that found in most mammals, but perhaps simpler also than that of many lizards’, but did note that ‘many postures elicited in captivity may never occur in the wild state and vice versa’.

1979) – or 40% of the value predicted from the more representative placental dataset used by Weisbecker and Goswami (2010) – and the long-beaked echidna has an even lower metabolic rate (Dawson et al. 1979; McNab 1984). The platypus metabolic rate, although low, is similar to that of many marsupials and placental mammals of the same mass, and platypus are continuously active for many hours in thermally challenging cold-water environments (Bethge et al. 2003). Short-beaked echidnas show much lower levels of activity and further reduce energy expenditure by employing torpor and hibernation, but there is no evidence that long-beaked echidnas or platypus employ torpor (Nicol et al.

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