

FOLLOWUS
1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
TANG Yingzhong, yingzhong.tang@qdio.ac.cn
Received:26 October 2016,
Accepted:18 December 2016,
Online First:10 February 2017,
Published:2018-03
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Aoao YANG, Zhangxi HU, Yingzhong TANG. Solid sand particle addition can enhance the production of resting cysts in dinoflagellates[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 273-280.
Aoao YANG, Zhangxi HU, Yingzhong TANG. Solid sand particle addition can enhance the production of resting cysts in dinoflagellates[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 273-280. DOI: 10.1007/s00343-018-6291-x.
Resting cysts are an important part of the life cycle for many harmful algal bloom-forming dinoflagellates
and play vital roles in the recurrence and geographical spread of harmful algal blooms. Numerous factors have been suggested to regulate the formation of resting cysts
although only a few have been proven to be significant. Cyst formation can be induced by adverse environmental conditions such as drastic changes in temperature
light
salinity
and nutrient levels
and by biological interactions. In this study
we evaluated the ability of an artificial factor (fine sand particles) to enhance the formation of resting cysts. Fine sand particles were added to cultures of dinoflagellates that are known to produce cysts. The addition of fine sand particles significantly increased both the production rate and final yield of cysts in cultures of
Scrippsiella trochoidea
Biecheleria brevisulcata
and
Levanderina fissa
(=
Gymnodinium fissum
Gyrodinium instriatum
Gyrodinium uncatenum
). The largest increase in the final yield (107-fold) of cysts as a result of sand addition was in
S. trochoidea
. However
addition of fine sand particles did not induce cyst formation
or barely affected cyst formation
in
Akashiwo sanguinea
Cochlodinium polykrikoides
and
Pheopolykrikos hartmannii
which are also known to be cyst-producing species. We speculated that addition of sand significantly increased the chances of cell collision
which triggered cyst formation. However
further research is required to test this idea. Importantly
our findings indicate that the addition of fine sand particles is a useful method to obtain a large quantity of cysts in a short time for laboratory studies or tests; for example
if a cyst viability test is being used to assess the effectiveness of ships' ballast water treatment.
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