Growth and mortality of coccolithophores during spring in a temperate Shelf Sea (Celtic Sea, April 2015)
Growth and mortality of coccolithophores during spring in a temperate Shelf Sea (Celtic Sea, April 2015)
复制标题
温带陆架海春季颗石藻的生长和死亡率（凯尔特海，2015 年 4 月）
DOI：
10.1016/j.pocean.2018.02.024
复制
发表时间：
2019
影响因子：
4.1
通讯作者：
Mayers K
中科院分区：
文献类型：
--
作者：
Mayers K
颗石藻是浮游植物群落的关键组成部分，通过生产由碳酸钙（方解石）和生物活性气体组成的颗石藻，对全球碳循环和地球气候产生重要影响。微型浮游动物的放牧是一个重要的死亡因素，在颗石藻水华，但目前知之甚少的死亡率（或增长）率在非水华人口。在一次春季巡航中，进行了颗石体方解石产量（CP）测量和稀释实验，以确定微型浮游动物（≤63 µm）的摄食率（2015年4月）在中凯尔特海（CCS），大陆架边缘（CS2），在CCS的J2.CP站，相邻的4月爆发的球石藻Emiliania huxleyiat站的范围为10.4至40.4 μmol C m−3d− 1，春季浮游植物大量繁殖（叶绿素浓度峰值为1.6毫克/立方米）。细胞标准化钙化率从0.17pmol C cell−1d− 1下降到0.2pmol C cell−1d−1，伴随着从混合颗石藻物种群落向以更轻度钙化物种E为主的群落的转变。huxleyi和Calciopappus caudatus。在CCS，颗石藻丰度从6增加到94个细胞mL-1，从4月4日到28日的净增长率为0.06到0.21 d-1。在CCS，稀释实验的内在生长率和放牧率的估计值分别为0.01 - 0.86 d-1和0.01 - 1.32 d-1，这导致了4月份净生长率的变化。微型浮游动物食草动物消耗了CCS每日方解石产量的59%至>100%。在E。huxleyibloom的最大密度为1986个细胞mL− 1，沿着，CP率为6000 µmol C m− 3 d − 1，内禀生长率为0.29 d−1，每日方解石产量的约80%被消耗。我们的研究结果表明，微型浮游动物可以对水华和非水华颗石藻种群施加强有力的自上而下的控制，每日生长（和方解石产量）的60%以上被摄食。消耗的方解石的命运尚不清楚，但可能通过溶解在酸性食物泡中，随后作为CO2释放，或在并入小粪便颗粒后出口到海底而损失。有了如此高的微型动物介导的死亡率损失，放牧方解石的命运显然是一个高优先级的研究方向。
Coccolithophores are key components of phytoplankton communities, exerting a critical impact on the global carbon cycle and the Earth’s climate through the production of coccoliths made of calcium carbonate (calcite) and bioactive gases. Microzooplankton grazing is an important mortality factor in coccolithophore blooms, however little is currently known regarding the mortality (or growth) rates within non-bloom populations. Measurements of coccolithophore calcite production (CP) and dilution experiments to determine microzooplankton (≤63 µm) grazing rates were made during a spring cruise (April 2015) at the Central Celtic Sea (CCS), shelf edge (CS2), and within an adjacent April bloom of the coccolithophoreEmiliania huxleyiat station J2.CP at CCS ranged from 10.4 to 40.4 µmol C m−3d−1and peaked at the height of the spring phytoplankton bloom (peak chlorophyll-aconcentrations ∼6 mg m−3). Cell normalised calcification rates declined from ∼1.7 to ∼0.2 pmol C cell−1d−1, accompanied by a shift from a mixed coccolithophore species community to one dominated by the more lightly calcified speciesE. huxleyiandCalciopappus caudatus. At the CCS, coccolithophore abundance increased from 6 to 94 cells mL−1, with net growth rates ranging from 0.06 to 0.21 d−1from the 4th to the 28th April. Estimates of intrinsic growth and grazing rates from dilution experiments, at the CCS ranged from 0.01 to 0.86 d−1and from 0.01 to 1.32 d−1, respectively, which resulted in variable net growth rates during April. Microzooplankton grazers consumed 59 to >100% of daily calcite production at the CCS. Within theE. huxleyibloom a maximum density of 1986 cells mL−1was recorded, along with CP rates of 6000 µmol C m−3d−1and an intrinsic growth rate of 0.29 d−1, with ∼80% of daily calcite production being consumed.Our results show that microzooplankton can exert strong top-down control on both bloom and non-bloom coccolithophore populations, grazing over 60% of daily growth (and calcite production). The fate of consumed calcite is unclear, but may be lost either through dissolution in acidic food vacuoles, and subsequent release as CO2, or export to the seabed after incorporation into small faecal pellets. With such high microzooplankton-mediated mortality losses, the fate of grazed calcite is clearly a high priority research direction.
登录
查看更多内容
影响因子：
4.9
作者：
A. Charalampopoulou;A. Poulton;D. Bakker;M. Lucas;M. Stinchcombe;T. Tyrrell
通讯作者：
A. Charalampopoulou;A. Poulton;D. Bakker;M. Lucas;M. Stinchcombe;T. Tyrrell
影响因子：
4.9
作者：
A. Poulton;M. Stinchcombe;E. Achterberg;D. Bakker;C. Dumousseaud;H. Lawson;Gareth A. Lee;S. Richier;D. Suggett;J. Young
通讯作者：
A. Poulton;M. Stinchcombe;E. Achterberg;D. Bakker;C. Dumousseaud;H. Lawson;Gareth A. Lee;S. Richier;D. Suggett;J. Young
北大西洋温带东部春季颗石藻的生产和扩散
影响因子：
--
作者：
R. Schiebel;U. Brupbacher;S. Schmidtko;G. Nausch;J. Waniek;H. Thierstein
通讯作者：
H. Thierstein
德文郡海岸埃米利亚尼亚·赫胥黎藻华期间微型浮游动物群落结构和微型浮游动物放牧的影响
DOI：
10.1017/s0025315402005593
发表时间：
2002
影响因子：
1.2
作者：
Elaine S. Fileman;D. Cummings;C. Llewellyn
通讯作者：
C. Llewellyn
季节性分层温带大陆架海中营养保存碳泵的机制
影响因子：
4.1
作者：
Humphreys M
通讯作者：
Humphreys M