Morphological variation and phylogeny of Karenia selliformis (Gymnodiniales, Dinophyceae) in an intensive cold-water algal bloom in eastern Hokkaido, Japan

Iwataki, Mitsunori; Lum, Wai Mun; Kuwata, Koyo; Takahashi, Kazuya; ARIMA, DAICHI; Kuribayashi, Takanori; Kosaka, Yuki; Hasegawa, Natsuki; Watanabe, Tsuyoshi; Shikata, Tomoyuki; Isada, Tomonori; Orlova, T. Yu.; Sakamoto, Setsuko

doi:10.1016/j.hal.2022.102204

Cited by 33 publications

(24 citation statements)

References 62 publications

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“…Similarly, the first recording of K . selliformis occurrence in Japan and Kamchatka waters (Iwataki et al, 2022) may also be possible alien species introduction in Avacha Bay region. The International Convention for the Control and Management of Ship’s Ballast Water and Sediments (BWM Convention 2004) entered in force in 2017 but by no means provide a fully effective solution to problem of HABs related to ballast water (Hallegraeff, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the recent development of next-generation sequencing (NGS) technologies led to their availability for field analysis and offered an enormous perspective for HAB monitoring (Jung et al, 2018; Hatfield et al, 2020). Ocean color satellite images is another key to studying the temperature trends and response of marine phytoplankton to climate variability and change (Groom et al, 2019), plankton distribution in ocean, and detecting and predicting HABs (Stumpf et al, 2008; Walsh et al, 2011; Zhong et al, 2019; Tang and Liu, 2020; Mirasbekov et al, 2021; Iwataki et al, 2022). Given the substantial climate-driven shifts in coastal ecological systems, accelerated interdisciplinary efforts are required to understand how climate change will influence the HABs.…”

Section: Introductionmentioning

confidence: 99%

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Long-term temperature trend in Kamchatka supports expansion of harmful algae

Samarkhanov

Mirasbekov

Meirkhanova

et al. 2022

Preprint

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Ocean coastal ecosystems are changing, and global shifts in temperature lead to the expansion and intensification of harmful algae. In conjunction with anthropogenic effects it may result in future exacerbation of harmful algal blooms. Here we use the 2002-2020 years record of surface ocean temperature data retrieved from Sentinel-2 satellite to examine the recent temperature trend in Avacha Bay, Kamchatka Peninsula. Satellite analysis demonstrated a temperature increase trend in ocean surface water during spring and summer months and detected algal bloom in July 2020 preceding a mass death of marine benthic life in September-October 2020. Using 16S rRNA and 18S rRNA gene amplicon nanopore-based sequencing, we analyzed microbial and microalgal communities in the water samples from area of 2020 algal blooms. Our results suggest the presence of potentially toxic and bloom-forming algae from genera related to former HABs (harmful algal blooms) in the Avacha Bay region. A better understanding of the potentially toxic algae phytoplankton composition in the shifting temperature environment and time-series monitoring of HABs is of utmost importance for scientific community. We suggest that satellite analysis in combination with eDNA monitoring by nanopore-based sequencing represents promising option to detect potentially toxic algae and follow bloom development.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-term temperature trend in Kamchatka supports expansion of harmful algae

Samarkhanov

Mirasbekov

Meirkhanova

et al. 2022

Preprint

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“…Blooms of the fish-killing K. selliformis cause significant ecological damage including water column anoxia and marine fauna toxicity worldwide, including in NZ, Mexico, Tunisia, Kuwait, Iran, China, and Chile [ 112 ]. In mid-September 2021 over a period of two months, an unprecedented mixed bloom of Karenia species, including K. selliformis , K. mikimotoi , K. longicanalis , Karlodinium sp., and Takayama spp., occurred along the south-eastern coast of Hokkaido, Japan [ 148 ], with mass die-offs of sea urchins ( Strongylocentrotus intermedius and Mesocentrotus nudus ), salmon ( Oncorhynchus keta ) in fixed nets, octopus ( Paroctopus conispadiceus ), whelks ( Neptunea spp. ), chitons ( Cryptochiton stelleri ), bivalves (e.g., Pseudocardium sachalinense ), and juvenile fish in rearing facilities [ 113 , 148 ].…”

Section: Effects Of Bloom Forming Hab Species On Species Of Relevance...mentioning

confidence: 99%

“…In mid-September 2021 over a period of two months, an unprecedented mixed bloom of Karenia species, including K. selliformis , K. mikimotoi , K. longicanalis , Karlodinium sp., and Takayama spp., occurred along the south-eastern coast of Hokkaido, Japan [ 148 ], with mass die-offs of sea urchins ( Strongylocentrotus intermedius and Mesocentrotus nudus ), salmon ( Oncorhynchus keta ) in fixed nets, octopus ( Paroctopus conispadiceus ), whelks ( Neptunea spp. ), chitons ( Cryptochiton stelleri ), bivalves (e.g., Pseudocardium sachalinense ), and juvenile fish in rearing facilities [ 113 , 148 ]. Following laboratory exposures, adult Manila clams, Ruditapes philippinarum , have also been shown to be sensitive to exposure to K. selliformis , with cellular changes in the hemolymph recorded up to 6 weeks following exposure to bloom concentrations [ 103 , 115 ].…”

Section: Effects Of Bloom Forming Hab Species On Species Of Relevance...mentioning

confidence: 99%

Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment

Rolton

Rhodes

Hutson

et al. 2022

Toxins

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Harmful algal blooms (HABs) have wide-ranging environmental impacts, including on aquatic species of social and commercial importance. In New Zealand (NZ), strategic growth of the aquaculture industry could be adversely affected by the occurrence of HABs. This review examines HAB species which are known to bloom both globally and in NZ and their effects on commercially important shellfish and fish species. Blooms of Karenia spp. have frequently been associated with mortalities of both fish and shellfish in NZ and the sub-lethal effects of other genera, notably Alexandrium spp., on shellfish (which includes paralysis, a lack of byssus production, and reduced growth) are also of concern. Climate change and anthropogenic impacts may alter HAB population structure and dynamics, as well as the physiological responses of fish and shellfish, potentially further compromising aquatic species. Those HAB species which have been detected in NZ and have the potential to bloom and harm marine life in the future are also discussed. The use of environmental DNA (eDNA) and relevant bioassays are practical tools which enable early detection of novel, problem HAB species and rapid toxin/HAB screening, and new data from HAB monitoring of aquaculture production sites using eDNA are presented. As aquaculture grows to supply a sizable proportion of the world’s protein, the effects of HABs in reducing productivity is of increasing significance. Research into the multiple stressor effects of climate change and HABs on cultured species and using local, recent, HAB strains is needed to accurately assess effects and inform stock management strategies.

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“…The consequences included disastrous massive die-offs of wild sea urchins, chum salmon in fixed nets, and juvenile fishes in rearing facilities . Karenia selliformis was identified as a dominant species of the HABs (Iwataki et al, 2022). Just 1 year before the occurrence of the HABs, a large-scale bloom of K. selliformis was recorded to the east of the Kamchatka Peninsula during September-October 2020 (Bondur et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Controlling factors of large-scale harmful algal blooms with Karenia selliformis after record-breaking marine heatwaves

et al. 2022

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Unprecedented, large-scale harmful algal blooms (HABs) dominated by Karenia selliformis occurred off the southeastern coast of Hokkaido, Japan, from late September to early November 2021, about a month after intense and extensive marine heatwaves (MHWs) had subsided. The aims of the present study were to understand the mechanism of development, maintenance, and decay of the HABs as well as to investigate the effect of the MHWs on the HABs. We developed a one-dimensional, lower trophic-level ecosystem model (NEMURO+) to simulate the HABs. The model successfully simulated the 2021 HABs and indicated that their development, maintenance, and decay were controlled primarily by changes of water temperature. Nitrate supply from subsurface layers by seasonal vertical diffusion in autumn also helped to maintain the HABs. Vertical diffusion following MHWs in 2021 contributed to the long duration of the preferred temperature for K. selliformis and the occurrence of pre-bloom of K. selliformis, resulting in preconditioning and accelerating the HABs. However, simulations for normal years (i.e., the climatological mean during 2003–2018) showed that HABs could have occurred, even in the absence of MHWs. The simulations indicated that massive blooms of other phytoplankton species (e.g., diatoms) would not have occurred in 2021, even in the absence of a K. selliformis bloom. The implication was that the HABs in 2021 were the species-specific responses of K. selliformis. The proposed mechanism of the HABs was peculiar to our study area and differed from that previously reported for other K. selliformis blooms. Specifically, the preferred temperature for the HABs of K. selliformis was clearly lower than the previously reported preferred temperature of K. selliformis; thus, the physiological characteristics of the K. selliformis that bloomed in our study area differed from those of other K. selliformis strains. These discoveries provide the first evidence to explain how MHWs affect HABs, and to understand how inter-regional dissimilarities of K. selliformis can lead to large-scale, devastating outbreaks under different oceanographic conditions.

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Morphological variation and phylogeny of Karenia selliformis (Gymnodiniales, Dinophyceae) in an intensive cold-water algal bloom in eastern Hokkaido, Japan

Cited by 33 publications

References 62 publications

Long-term temperature trend in Kamchatka supports expansion of harmful algae

Long-term temperature trend in Kamchatka supports expansion of harmful algae

Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment

Controlling factors of large-scale harmful algal blooms with Karenia selliformis after record-breaking marine heatwaves

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