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E CLARK

Publications and source records attributed to E CLARK.

18 recordsLinked to original sources

PERICARDITIS.

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Adenoviridae Infections↗

Instrumental conditioning of lemon sharks.

Two sharks were trained to feed at a target which, when pressed, caused a submerged bell to ring. Later they were trained to press the target for remotely placed food. They retained this conditioned response after a 10-week period of inactivity.

Animals↗

Functional hermaphroditism and self-fertilization in a serranid fish.

Each mature individual of Serranellus subligarius, regardless of size, has at the same time both motile sperm and eggs. Embryos and larvae were produced from artificial fertilizations and from isolated fish kept in aquaria. Mating behavior of pairs and groups of hermaphrodites shows two types of behavioral patterns involving different color changes.

Animals↗

Tips on legibility.

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Audiovisual Aids↗