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- W2334362316 abstract "Fast green was used to stain selectively the reproductive system and ova of adult female Metridia pacifica. Reproductive maturity of adult females of M. pacifica in the subarctic Pacific exhibited a marked seasonal cycle during 1980-1981. Seasonal variation of female reproductive condition agreed well with that expected from the abundance of naupliar stages in plankton collections. The seasonal timing and intensity of reproduction in pelagic marine copepods is difficult to evaluate in the field. Two approaches are used commonly to discern cohorts and infer the timing of reproduction in marine copepods. They are: (1) evaluation of the abundance of early (naupliar) life stages in a time series of plankton samples (Nicholls, 1933; Marshall, 1949), and (2) evaluation of gonad maturity, egg number, or egg development within the body of the adult females (Marshall and Orr, 1955; Tande and Hopkins, 1981). While the eggs, ovaries, and oviducts of some adult female copepods, e.g., Calanus marshallae (Peterson, 1980) and Neocalanus plumchrus, N. cristatus, and Eucalanus bungii (Miller et al., 1984), are more opaque than muscle and other tissues and readily can be seen using transmitted illumination, the eggs of other copepod species, e.g., Metridia spp., are not easily distinguished from other body tissues, either prior to or after preservation. For such species, a stain is required which either selectively stains ova or is retained by gonadal material upon clearing. Several different stains have been used in previous studies investigating the development of the reproductive system in copepods. Marshall and Orr (1960) tested the suitability of several stains for the ova and reproductive system of Calanusfinmarchicus. A celestine blue staining method was judged to be superior to either borax carmine or methylene blue, although the borax carmine method proved fairly satisfactory. Tande and Hopkins (1981) used borax carmine in their investigation of gonad development and overwintering in Calanus finmarchicus, and their method was subsequently used to describe gonad development in Metridia longa (Tande and Gronvik, 1983). This paper describes a staining technique that was developed to study the seasonal timing and intensity of reproduction of the copepod Metridia pacifica in the oceanic subarctic Pacific. The results are compared to those obtained by evaluation of naupliar abundance from fine mesh plankton sampling. The new staining procedure was also compared to the borax carmine and celestine blue methods." @default.
- W2334362316 created "2016-06-24" @default.
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- W2334362316 date "1986-01-01" @default.
- W2334362316 modified "2023-09-27" @default.
- W2334362316 title "A STAINING TECHNIQUE FOR DETERMINING COPEPOD GONAD MATURATION: APPLICATION TO METRIDIA PACIFICA FROM THE NORTHEAST PACIFIC OCEAN" @default.
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- W2334362316 doi "https://doi.org/10.1163/193724086x00055" @default.
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