Length and weight relationships of <i>Acartia clausi</i> from Narragansett Bay, R.I. 1

Durbin, Edward G.; Durbin, Ann G.

doi:10.4319/lo.1978.23.5.0958

Cited by 129 publications

(92 citation statements)

References 4 publications

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“…For carbon growth the slopes and intercepts of the regressions differed among food levels (ANCOVA, p < 0.05) and all 3 relationships are shown copepods (e.g. Deevey 1960, McLaren 1965, Durbin & Durbin 1978. We estimate that the total protein content of copepodite stages was 26 to 50% greater and the DNA content 13 to 29% greater at 4°C than at 12°C.…”

Section: Effects Of Temperature and Food On Biochemical Composition Omentioning

confidence: 76%

Nucleic acids and growth of Calanus finmarchicus in the laboratory under different food and temperature conditions

Wagner¹,

Campbell²,

Boudreau³

et al. 2001

Mar. Ecol. Prog. Ser.

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We examined the effects of food concentration and temperature on nucleic acids and protein content of Calanus finmarchicus in order to evaluate the use of RNA as a growth rate index for this species. We measured RNA, DNA, and protein content of copepods reared from egg to adult stage in 5 combinations of food and temperature conditions (25 to 500 µg C l -1 , 4 to 12°C). At 8°C, DNA, RNA and protein content and RNA:DNA differed among food treatments during Stages N6 through to adult female. Protein:DNA ratios and RNA:protein ratios were significantly different among food levels for only 3 of the 8 stages examined. At excess food, DNA, RNA, and protein content and RNA:DNA ratios were inversely related to temperature for most stages from C1 onward, but the effect of temperature was relatively small over the range of temperatures investigated. The RNA:DNA and protein:DNA ratios increased with developmental stage whereas the RNA:protein ratio and growth rates (measured in terms of protein, nitrogen, DNA, and carbon content) declined with increasing stage. Although the relationship of RNA:DNA to growth rates was stage-specific, the two were related when standardized for temperature and developmental stage. RNA:protein ratios were directly related to growth rates regardless of stage, and the slope of the relationship increased with increasing temperature in a nonlinear fashion. Our results emphasize the importance of temperature and developmental stage for the relationship of growth rates to RNA concentration and RNA:DNA ratios. We propose 2 ways to estimate in situ growth rates of C. finmarchicus from RNA:DNA or RNA:protein ratios and environmental temperature.

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Section: Effects Of Temperature and Food On Biochemical Composition Omentioning

confidence: 76%

Nucleic acids and growth of Calanus finmarchicus in the laboratory under different food and temperature conditions

Wagner¹,

Campbell²,

Boudreau³

et al. 2001

Mar. Ecol. Prog. Ser.

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“…Freezing of preserved harpacticoid samples was assumed to not alter biomass. However, direct loss in both dry mass and carbon content is known to result from formalin preservation (Feller and Warwick 1988 following preservation with a trend toward stabilization after approximately 30 d (Durbin and Durbin 1978;Omori and Ikeda 1984;Widbom 1984). Loss of biomass due to leaching or other preservation artifacts was corrected by applying conversion factors of 1.26 (i.e., 26%) for dry mass and 1.14 (i.e., 14%) for carbon content (derived from Durbin and Durbin 1978).…”

Section: Baguley Et Al Measurement Of Meiofaunal Biomass 183mentioning

confidence: 99%

“…Sediment cores from a water depth of ~3 m were collected with a 5-cm diameter coring tube attached to a PVC pole. Surface sediments (~upper 2 cm) were retained for extraction using the isopycnic protocol described above with one modification: samples were not preserved (e.g., formalin and ethanol) prior to processing to avoid the negative effect (i.e., loss of dry mass and carbon content) on direct measurements (Durbin and Durbin 1978;Omori and Ikeda 1984). Instead, samples were processed immediately or stored in a refrigerator at 2°C for a maximum of 3 d prior to processing.…”

Section: Baguley Et Al Measurement Of Meiofaunal Biomass 183mentioning

confidence: 99%

A semi‐automated digital microphotographic approach to measure meiofaunal biomass

Baguley

Hyde

Montagna

2004

Limnology & Ocean Methods

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Meiofauna studies often investigate community structure and function where biomass estimates and taxonomic analysis are required. Nondestructive methods of biomass estimation are necessary to preserve specimens for subsequent taxonomic analysis. A semi-automated protocol to estimate meiofaunal biomass was developed to meet this need. The method improves upon previous indirect biomass techniques by using digital microphotography and analytical graphics software to obtain better estimates of biovolume. The technique is not fully automated because the digital images require some manipulation. Dry mass and carbon mass were estimated for two dominant components of marine benthic meiofauna (Nematoda and Harpacticoida) as the product of conversion factors and body volumes. The technique was validated by comparing indirect dry and carbon mass estimates to direct measurements using an analytical balance and carbon-hydrogen-nitrogen (CHN) elemental analyzer. No significant difference was found between the semi-automated method and direct measurements for harpacticoid dry or carbon mass (P = 0.68 and P = 0.74, respectively), or nematode dry mass (P = 0.28) or carbon content (P = 0.17). The semi-automated indirect method was used to estimate the biomass of meiofauna (13,279 harpacticoids and 12,288 nematodes) collected from the deep-sea Gulf of Mexico. Estimated average wet mass was compared to direct analytical balance measurements from an earlier, independent study in the same area. Wet mass estimates generated by the indirect method (2.67 ± 0.86 µg/harpacticoid and 0.85 ± 4.78 µg/ nematode) were similar to direct measurements in the earlier study (2.80 µg/harpacticoid and 0.85 µg/nematode). The semi-automated indirect method is about three times faster than traditional microscope methods to measure body volume, estimates biomass comparably to direct methods, and conserves samples and images of samples for other analyses.

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“…Because of narrow ranges of these size measures (PL: 2.5-10.8 mm, DW: 0.3 to 27.3 mg, cf. Table 2) Previously, the CFI was computed as 8-13 (re-calculated with the equation of this study) for Acartia clausi by Durbin and Durbin (1978) as a possible index sensitive to change in food and other environmental conditions for this small neritic copepod.…”

mentioning

confidence: 99%

Chemical composition and energy content of deep-sea calanoid copepods in the Western North Pacific Ocean

Ikeda

Yamaguchi

Matsuishi

2006

Deep Sea Research Part I: Oceanographic Research Papers

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Condition factor index [CFI=1000×DW/(PL) 3 ; DW: dry weight, PL: prosome length], water content, carbon (C), nitrogen (N), ash and energy content were determined on a total of 69 copepod species caught from the mesopelagic (500-1000 m), upper-bathypelagic (1000-2000 m), lower-bathypelagic (2000-3000 m) and abyssopelagic (3000-5000 m) zones of the western subarctic Pacific. Resultant data were grouped into these four sampling zones, four developmental stage/sex categories (C4, C5 and C6 females and males), three feeding types (carnivore, detritivore and suspension feeder), or two reaction speed groups by the presence/absence of myelinated sheath enveloping axons (fast and slow reacting species). Zone-structured data showed the overall ranges were 3.8-4.6 mm for PL, 1.6-2.6 mg for DW, 21.4-25.0 for CFI, 75.0-78.6% of wet weight (WW) for water, 51.3-53.7% of DW for C, 7.7-8.8% of DW for N, 6.2-7.0 (by weight) for C/N, 6.9-9.6% of DW for ash and 25.3-27.4 J mg -1 DW for energy. Among these components, N and ash exhibited significant between-zone differences characterized by gradual decrease downward for the former, and only the upper-bathypelagic zone > abyssopelagic zone for the latter.Stage/sex-structured data showed no significant differences among them, but energy content of C5 was higher than that of C6 females. From the analyses of feeding

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Length and weight relationships of Acartia clausi from Narragansett Bay, R.I. 1

Cited by 129 publications

References 4 publications

Nucleic acids and growth of Calanus finmarchicus in the laboratory under different food and temperature conditions

Nucleic acids and growth of Calanus finmarchicus in the laboratory under different food and temperature conditions

A semi‐automated digital microphotographic approach to measure meiofaunal biomass

Chemical composition and energy content of deep-sea calanoid copepods in the Western North Pacific Ocean

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