POST EMBRYONIC GROWTH AND AGE IN SOME LITTORAL ORCHESTIA (AMPHIPODA, TALITRIDAE)
POST EMBRYONIC GROWTH AND AGE IN SOME LITTORAL ORCHESTIA (AMPHIPODA, TALITRIDAE)
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一些滨海动物（片足动物、蜈蚣科）的胚胎后生长和年龄
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发表时间：
2016
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影响因子：
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通讯作者：
D. Wildish
中科院分区：
文献类型：
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作者：
D. Wildish
An adequate description of growth in Crustacea depends on determining both the frequency of moulting and the linear or weight increment at each moult. In growth studies of Gammarus chevreuxi Sexton by Sexton (1924) and Hyalella azteca Saussure by Geisler (1944) and Bovee (1950) moulting frequency and growth stages were studied, but no attempts made to relate the data to weight or linear increments. Sutcliffe (1965) measured dry weight, head length and total R.N.A. content in different sizes of Orchestia platensis Kroyer but age was estimated from the empirical growth equation of Bertalanffy. The data presented here are linear measurements, age and length increment at a moult in four species of Orchestia during juvenile and part of immature life. The life history stages recognized were: (1) juvenile ? lacking external sexual characters, (2) immature male or female ? juveniles undergoing a sexualization process spread over a number of moults and beginning with the appearance of oostegites in female and penis in male, and (3) mature male or female, ? with complete secondary sexual characters. The aim of the study was to compare growth rates in some littoral Orchestia which show varying degrees of pre-adaptation to terrestrial life. The species compared include the freshwater and estuarine O. cavimana Heller, the marine and estuarine O. mediterr?nea A. Costa, morph mediterr?nea (see Wildish, 1970a) and O. gammarellus (Pallas), all of which are generalized detritivores with a wide range of digestive enzymes (see Agrawal, 1964, and Nielsen, 1966). The other form studied, O. remyi roffensis Wildish, is known only from the type locality in the polyhalinicum of the Medway estuary (see Wildish, 1969) where it lives under and feeds on damp driftwood. Arranged in successively higher tidal positions on the shore, and hence degree of pre-adaptation to terrestrial life, the marine and estuarine species form the series: O. mediterr?nea ? O. gamma rellus ? O. remyi roffensis.
