Mesozooplankton grazing in the Southern California Bight. I. Population abundances and gut pigment contents
Mesozooplankton grazing in the Southern California Bight. I. Population abundances and gut pigment contents
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DOI：
10.3354/meps115055
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发表时间：
1994
影响因子：
2.5
通讯作者：
Landry;W. Peterson;V. Fagerness
中科院分区：
文献类型：
--
作者：
Landry;W. Peterson;V. Fagerness
在 1985 年 10 月至 1988 年 2 月期间，对美国加利福尼亚州圣莫尼卡盆地中型浮游生物群落的肠道色素含量进行了 3 次冬春和 3 次秋季航行的检查。秋季航行中 70 m 上部的平均叶绿素浓度为 0.30 至 0.32 mg m-3，冬春季航行为 0.35 至 1.7 mg m-3。较大的甲壳类浮游动物种类，特别是桡足类太平洋哲蚌，在冬春季节更加丰富，这种趋势在中上层被囊动物的体型结构上也很明显。较大的洄游类群（C. pacificus、Metridia lucens、Pleuromamma spp.、大型磷虾科和介形类）以及通常一些较小的非洄游类群（Clausocalanus spp.、Acartia spp 和阑尾类）的肠道色素表明摄食强度具有周期性，肠道色素通常在夜间或清晨最高。当春季叶绿素浓度和平均肠道色素含量 (ng chl equ. ind:') 最高时，摄食周期最弱。冬春季节群落肠道色素（CGP）的昼夜比为1.02至1.95，秋季为1.77至3.39。迁徙类群解释了冬春季节的大部分昼夜差异，但秋季的昼夜差异相对较少。小型物种和发育阶段（体长约 1.5 毫米）在秋季的白天（95.1 至 99.8%）和夜间（63.6 至 96.2%）CGP 中占主导地位，并且在冬春巡航中也很重要（尽管相对不那么重要）（白天 58.2 至 76.9%，夜间 37.7 至 53.7%）。 1986 年 5 月和 1987 年 4 月，桡足类占 CGP 的大部分。 1988 年 2 月，海藻类占主导地位，通常在冬春季节比秋季更重要，磷虾科也是如此。翼足类动物对 1985 年 10 月的 CGP 做出了重大贡献。阑尾动物 (Oikopleura sp.) 在所有航行中都是主要食草动物，但在 3 次秋季航行中它们对 CGP 的贡献超过了桡足类动物。
Gut pigment content of the mesozooplankton community in Santa Monica Basin, California, USA was examined on 3 winter-spring and 3 autumn cruises between October 1985 and February 1988. Mean chlorophyll concentrations for the upper 70 m varied from 0.30 to 0.32 mg m-3 for autumn cruises and from 0.35 to 1.7 mg m-3 for winter-spring cruises. Larger crustacean zooplankton species, particularly the copepod Calanus pacificus, were more abundant in the winter-spring, and this trend was also evident in size structure of pelagic tunicates. Gut pigments of larger, migratory taxa (C. pacificus, Metridia lucens, Pleuromamma spp., large euphausiids, and ostracods) and often some of the smaller, non-migratory forms (Clausocalanus spp., Acartia spp , and appendicularians) indicated die1 periodicity in feeding intensity with highest gut pigments generally at night or in the early morning. Feeding periodicity was weakest when chlorophyll concentration and mean gut pigment content (ng chl equ. ind:') was highest in the spring. The night:day ratio of community gut pigment (CGP) varied from 1.02 to 1.95 for the winter-spring period and from 1.77 to 3.39 for the autumn period. Migrating taxa explained most of the day-night difference in the winter-spring but relatively little of the difference in the autumn. Small species and developmental stages (c1.5 mm body length) dominated daytime (95.1 to 99.8%) and nighttime (63.6 to 96.2 %) CGP during the autumn and were important, though relatively less so, in the winter-spring cruises (day 58.2 to 76.9%, night 37.7 to 53.7%). Copepods accounted for the majority of CGP in May 1986 and April 1987. Thaliaceans dominated in February 1988 and were generally more important in winter-spring than autumn, as were euphausiids. Pteropods made a significant contribution to CGP in October 1985. Appendicularians (Oikopleura sp.) were major grazers during all cruises, but their contribution to CGP surpassed that of copepods on the 3 autumn cruises.