A modeling investigation into the ecological role of mixotrophy in Karenia brevis blooms on the West Florida Shelf

IF 4.5 1区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Yuren Chen , Ming Li , Patricia M. Glibert , Cynthia Heil , So Hyun Ahn
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Abstract

While laboratory experiments show Karenia brevis graze on Synechococcus to supplement nutrition, the ecological role of mixotrophy in K. brevis blooms on the West Florida Shelf remains unquantified. This study employs a three-dimensional coupled hydrodynamic-biogeochemical model to investigate the contribution of mixotrophic feeding to the K. brevis growth as well as the role of mixotrophic grazing in suppressing prey population and delivering a competitive advantage to the mixotroph. It is shown that mixotrophy moderately increased the growth rate of K. brevis in the bloom center but was important along the offshore margin of the bloom region, where the prey-to-predator ratio was high. With the digestion rate reaching over 200 prey cells K. brevis-1 day-1, mixotrophy could support a heterotrophic growth rate of up to 0.16 day-1 in the offshore region and may facilitate the offshore expansion of K. brevis blooms. Mixotrophic feeding also played a significant role in sustaining the K. brevis bloom during the late spring and summer periods when the inorganic nutrient concentrations were low. The grazing pressure exerted on Synechococcus was found to be vital for the slow-growing K. brevis to outcompete the oligotrophic-adapted prey. These model results demonstrate that mixotrophy not only functions as an additional nutrient source but also as an ecological mechanism that can reshape interspecific competition and harmful algal bloom dynamics.
混合营养在西佛罗里达陆架短卡兰氏菌华中生态作用的模拟研究
虽然实验室实验表明短克雷氏菌以聚球菌为食补充营养,但西佛罗里达大陆架短克雷氏菌繁殖中混合营养的生态作用仍未量化。本研究采用三维水动力学-生物地球化学耦合模型,研究了混合营养化饲养对短叶虎生长的贡献,以及混合营养化放牧在抑制猎物数量和为混合营养化动物提供竞争优势中的作用。结果表明,混合营养适度地提高了短链乳杆菌在华区中心的生长速度,但在华区近海边缘的生长速度很重要,因为那里的捕食比很高。当消化速度超过200个猎物细胞-1 day-1时,混合营养可以在近海地区支持高达0.16 day-1的异养生长速率,并可能促进短叶藻华的近海扩张。在无机营养物浓度较低的春末夏季,混合营养化饲喂对短叶藻华的维持也起着重要作用。研究发现,对聚珠球菌施加的放牧压力对于生长缓慢的短链镰刀菌与适应寡养的猎物竞争至关重要。这些模型结果表明,混合营养不仅是一种额外的营养来源,而且是一种重塑种间竞争和有害藻华动态的生态机制。
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来源期刊
Harmful Algae
Harmful Algae 生物-海洋与淡水生物学
CiteScore
12.50
自引率
15.20%
发文量
122
审稿时长
7.5 months
期刊介绍: This journal provides a forum to promote knowledge of harmful microalgae and macroalgae, including cyanobacteria, as well as monitoring, management and control of these organisms.
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