| 食物浓度对来自不同营养水平水体盔型溞（Daphnia galeata）克隆生活史参数的影响 |
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| 引用本文： | 黄小娥,郭诗元,林秋奇.食物浓度对来自不同营养水平水体盔型溞（Daphnia galeata）克隆生活史参数的影响[J].水生态学杂志,2023,44(5):84-91. |
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| 作者姓名： | 黄小娥 郭诗元 林秋奇 |
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| 作者单位： | 暨南大学,暨南大学,暨南大学 |
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| 摘 要： | 富营养化可导致浮游植物数量和质量的变化，从而对浮游动物产生影响。浮游动物在面对水体富营养化所导致的食物质量变化时存在适应性进化。为探讨浮游动物对食物数量变化的生态适应性，本文比较分析了高食物浓度（2 mg C L-1）和低食物浓度（0.5 mg C L-1）的斜生栅藻（碳磷比为105）对3个来自不同营养水平水库（贫-中营养、中营养和富营养）的盔型溞克隆生活史参数的影响。在高食物浓度处理组，三个克隆幼溞生长速率、首窝和第二窝产仔量和内禀增长率均显著高于低食物组；首次生殖时间和新生幼溞体长显著小于低食物组；首次怀卵体长在两个处理间无显著差异。食物的增加缩短了性成熟时间，增加产仔量，从而提高内禀增长率。首次生殖时间在三个克隆间没有显著差异，但来自中营养水体克隆的产仔量在两个食物处理组中均显著低于其它两个克隆，导致中营养水体克隆内禀增长率小于其它两个克隆。贫-中营养水体克隆在两个食物处理组中内禀增长率均与富营养水体克隆没有显著差异。结果表明，三个盔型溞克隆对食物浓度变化均表现出较高的表型可塑性，但在生活史策略上并未表现出适应性进化。
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| 关 键 词： | 枝角类 生活史策略 食物数量 富营养化 |
| 收稿时间： | 2021/9/23 0:00:00 |
| 修稿时间： | 2021/10/11 0:00:00 |
Effect of Food Quantity on the Life History of Cloned Daphnia galeata from Reservoirs of Differing Trophic State |
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| HUANG Xiao-e,GUO Shi-yuan,LIN Qiu-qi.Effect of Food Quantity on the Life History of Cloned Daphnia galeata from Reservoirs of Differing Trophic State[J].Journal of Hydroecology,2023,44(5):84-91. |
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| Authors: | HUANG Xiao-e GUO Shi-yuan LIN Qiu-qi |
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| Affiliation: | Jinan University,Jinan University,Jinan University |
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| Abstract: | Eutrophication can lead to changes in the quantity and quality of phytoplankton, which can have impacts on zooplankton. Zooplankton can evolve to adaptive the changes of food quality caused by eutrophication. To explore the adaptation of zooplankton to food quantity changes. We examined the effects of food quantity on the growth and reproduction of three Daphnia galeata clones collected from three reservoirs with varying trophic conditions (oligo-mesotrophic, mesotrophic and eutrophic) in a life history experiment. Green alga Scenedesmus obliquus (C:P = 105) served as food source and was given in two amounts, 0.5 (low-quantity) and 2 (high-quantity) mg C L-1. Our results suggest that growth and reproduction were lower and the onset of reproduction was delayed on a diet of low quantity compared to a diet of high quantity. The intrinsic population growth rates for each D. galeata clone on a diet of low quantity ranged from 0.05 to 0.08 d-1, whereas the intrinsic population growth rate on a diet of high quantity ranged from 0.29 to 0.37 d-1. The neonate body growth rate ranged from 0.27 to 0.28 mm d-1 in low-quantity, and 0.34 to 0.37 mm d-1 in high-quantity. However, compared with individuals fed low quantity food, D. galeata fed on high quantity food produced smaller eggs. The degree of population growth enhancement on the high quantity diet varied among clones. Intrinsic population growth rate showed no significant difference between clones from oligo-mesotrophic and eutrophic reservoirs, irrespectively of food quantity. In this study, all three clones showed high phenotypic plasticity in response to changes in food concentration, but they did not show adaptive evolution in life history strategies. |
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| Keywords: | Cladocerans life history food quantity eutrophication |
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