Chemical composition and energy content of deep-sea calanoid copepods in the Western North Pacific Ocean |
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| Institution: | 1. College of Animal Science, South China Agricultural University, Guangzhou 510642, China;2. Laboratory of Evolutionary Physiology and Behavior, Chongqing Key Laboratory of Animal Biology, Chongqing Normal University, Chongqing 400047, China;1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China;2. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China;3. Jiaozhou Bay Marine Ecosystem Research Station, Chinese Ecosystem Research Network, 7 Nanhai Road, Qingdao 266071, China |
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| Abstract: | 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 type-structured data, carnivores were shown to have lower water, N, ash, but higher C, C/N and energy contents than suspension feeders do. Reaction speed-structured data indicated that slow-reacting species have significantly higher water but lower CFI, C, N and energy contents than fast-reacting species. Designating these grouping criteria, PL and DW as independent variables, the attributes of these variables to the CFI, chemical composition or energy contents were evaluated by stepwise-multiple regression analysis, showing the most pronounced effect of suspension-feeder, followed by the presence of myelinated sheath, DW, C6 females and the abyssopelagic zone. Further analysis of zone-structured data, by adding epipelagic copepod data from identical thermal habitats (Arctic/Antarctic waters), revealed a more marked decline in N content from the epipelagic zone to the abyssopelagic zone, accompanied by an increase in C/N ratios downward. The decline in N (=protein or muscle) contents with depth cannot be explained by the “visual interactions” hypotheses being proposed for the metabolism of pelagic visual predators, but is consistent with the “predation-mediated selection” hypothesis for the metabolism of pelagic copepods. |
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