| 不同氮条件下安氏伪镖水蚤(Pseudodiaptomus annandalei)的生长和摄食 |
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| 引用本文： | 何学佳,张君纲,石 琛,吕柏东.不同氮条件下安氏伪镖水蚤(Pseudodiaptomus annandalei)的生长和摄食[J].海洋与湖沼,2012,43(3):609-614. |
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| 作者姓名： | 何学佳 张君纲 石 琛 吕柏东 |
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| 作者单位： | 暨南大学赤潮与海洋生物学研究中心,广州,510632 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目, 2011CB403603 号; 国家自然科学青年基金项目, 40906068 号; 广东省自然科学基金项目, 9451063201002243号; 中央高校基本科研业务费专项资金, 21611427号 |
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| 摘 要： | 分别以高氮(摩尔C/N=8.5)、低氮(C/N=12.7)和氮添加(C/N=9.6)亚心形四爿藻(Tetraselmis subcordiformis)喂食安氏伪镖水蚤(Pseudodiaptomus annandalei)的幼体和成体,研究了此水蚤在不同氮条件下的生长、发育和摄食。随着藻细胞C/N比值的升高,安氏伪镖水蚤的生长速率从(0.067±0.001)/d减缓到(0.056±0.001)/d,同时,高氮条件下,幼体分别发育5d和18d后进入桡足幼体期和成体期,氮添加实验组与之相仿,低氮条件下则推迟到第8天进入桡足幼体期。随着藻细胞C/N比值的升高,安氏伪镖水蚤各个时期个体的氮含量显著降低,存活率也随之降低。处于高氮或氮添加条件下的无节幼体、桡足幼体和成体的氮摄食率(0.53-0.95)×10?4mgN/(ind·h)]均比低氮条件(0.32-0.6)×10?4mgN/(ind·h)]要高,但仅成体的碳摄食率在高氮条件下达(8.11±1.21)×10?4mgC/(ind·h),明显高于低碳条件下的(7.54±0.35)mgC/(ind·h)。结果表明:氮缺乏对安氏伪镖水蚤的生长发育和摄食等均有明显的抑制作用。氮添加条件下的饵料仅部分逆转这种抑制作用,暗示安氏伪镖水蚤的生长和摄食除受氮元素的直接限制外,还可能由于饵料在低氮时缺乏某些化合物而受限。
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| 关 键 词： | 桡足类 生长 摄食 氮 |
| 收稿时间： | 2011/12/31 0:00:00 |
| 修稿时间： | 2012/2/28 0:00:00 |
GROWTH AND INGESTION OF PSEUDODIAPTOMUS ANNANDALEI UNDER DIFFERENT NITROGEN CONDITIONS |
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| Institution: | Research Center for Harmful Algae and Marine Biology, Jinan University;Research Center for Harmful Algae and Marine Biology, Jinan University;Research Center for Harmful Algae and Marine Biology, Jinan University;Research Center for Harmful Algae and Marine Biology, Jinan University |
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| Abstract: | Fed on cells of Tetraselmis subcordiformis with high nitrogen content(HN,molar C/N=8.5),low nitrogen content(LN,C/N=12.7) and with short-term addition of nitrogen after culture in f/2 medium without N(AN,C/N=9.6),the Growth,development and ingestion of Pseudodiaptomus annandalei were investigated.With the increase of C/N of algal cells,growth rate of P.annandalei decreased from(0.067±0.001) to(0.056±0.001) d?1.Nauplii entered into copedites or maturation on Day 5 or 18 after birth under HN condition.Under LN condition,they developed into copedites on Day 8.N contents of nauplii,copedites and adults of P.annandalei decreased with the increase of C/N of algal cells.So did the survivorship.P.annandalei of all three life stages under HN or AN conditions had higher ingestion rates in terms of N (0.53—0.95)×10?4mgN/(ind.h)] than those under LN condition (0.32—0.6)×10?4mgN/(ind.h)].However,only adults under HN had higher C ingestion rate than their counterparts under LN condition (8.11±1.21)×10?4 vs.(7.54±0.35)mgC/(ind.h)].N deficiency significantly suppressed the growth,development and ingestion rate in P.annandalei.The short-term addition of N partly reversed the suppression by LN. |
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| Keywords: | Copepod Growth Ingestion rate Nitrogen |
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