Sexual Reproduction of a Red Tide Dinoflagellate Gymnodinium mikimotoi

1994 ◽  
Vol 60 (1) ◽  
pp. 125-126 ◽  
Author(s):  
Akira Ouchi ◽  
Satoshi Aida ◽  
Takuji Uchida ◽  
Tsuneo Honjo
Keyword(s):  
Sexual Reproduction ◽  
Red Tide

ULTRASTRUCTURAL ASPECTS OF SEXUAL REPRODUCTION IN THE RED TIDE DINOFLAGELLATE GONYAULAX TAMARENSIS1

1989 ◽  
Vol 25 (1) ◽  
pp. 95-107 ◽  
Author(s):  
Lawrence Fritz ◽  
Donald M. Anderson ◽  
Richard E. Triemer
Keyword(s):  
Sexual Reproduction ◽  
Red Tide

scholarly journals Sexual Reproduction in Dinoflagellates—The Case of Noctiluca scintillans and Its Ecological Implications

2021 ◽  
Vol 8 ◽  
Author(s):  
Jeffery Liang-Neng Lee ◽  
Kuo-Ping Chiang ◽  
Sheng-Fang Tsai
Keyword(s):  
Sexual Reproduction ◽  
Light Exposure ◽  
Red Tide ◽  
Experimental Period ◽  
Reproduction Rate ◽  
Ecological Role ◽  
Alternative Mode ◽  
Prey Concentration ◽  
Noctiluca Scintillans ◽  
Mother Cells

Noctiluca scintillans is a larger, bioluminescent red-tide dinoflagellate (400–1,000 μm in diameter) that reproduces by sexual or asexual reproduction (binary fission). The process of sexual reproduction in N. scintillans has been thoroughly studied, but the ecological role and the mechanism of shifting from asexual to sexual reproduction have not been fully elucidated. It is believed, however, that sexual reproduction occurs when N. scintillans faces environmental stress. In this study, we tried to determine which factors drive N. scintillans to undergo sexual reproduction and we considered sexual reproduction’s ecological role. We cultured N. scintillans under different conditions of temperature, N. scintillans cell concentration, prey concentration, cultivation time, cultivation volume, light exposure time and physical vibration (simulated wave motion), and counted gametocyte mother cells every 24 h to calculate how the sexual reproduction rate changed over the experimental period. Rises in the sexual reproduction rate or the concentration of gametocyte mother cells only occurred in response to large variations in prey concentration, typically after the exponential phase of N. scintillans population growth. A noticeable upsurge in gametocyte mother cells, from 1% or less to nearly 10% of the total N. scintillans population, occurred when the prey concentration fell below ∼400 cells/mL. This implies that a sudden decrease in prey concentration induces more N. scintillans to shift from trophonts to gametocyte mother cells. We suggest that sexual reproduction may occur in N. scintillans as a response to the post-bloom situation when the dinoflagellate’s food supply has been dramatically depleted, producing large numbers of gametes for an alternative mode of survival after the end of each bloom.

Life cycle of Spirogyra decimina var. juergensii (Kütz.) O.V. Petlovany from Lake Baikal

2018 ◽  
pp. 1-7
Author(s):  
Ekaterina A. Volkova
Keyword(s):  
Life Cycle ◽  
Sexual Reproduction ◽  
Lake Baikal

Identification of Spirogyra species is based on the morphology of the fertile specimens. This work provides characteristics of growth and the time of reproduction of Spirogyra decimina var. juergensii in Lake Baikal and describes sexual reproduction and conditions for germination of new filaments of this species isolated from the lake.

Selenium Requirement for Growth of a Novel Red Tide Flagellate Chattonella verruculosa (Raphidophyceae) in Culture

1996 ◽  
Vol 62 (5) ◽  
pp. 834-835 ◽  
Author(s):  
Ichiro Imai ◽  
Shigeru Itakura ◽  
Yukihiko Matsuyama ◽  
Mineo Yamaguchi
Keyword(s):  
Red Tide

Definitions and concepts of reproductive biology of diatoms (terminological glossary)

2017 ◽  
Vol 51 ◽  
pp. 71-105 ◽  
Author(s):  
N. A. Davidovich
Keyword(s):  
Mating System ◽  
Sexual Reproduction ◽  
Reproductive Biology ◽  
World Literature ◽  
Russian Literature ◽  
Life Cycles ◽  
Transfer Of Knowledge ◽  
Research Experience ◽  
Key Terms

The absence of a conceptual terminology, sufficiently developed and widely accepted in the Russian literature, significantly hinders progress in the field of reproductive biology of diatoms, restricts communication and debate, prevents training and transfer of knowledge. The present work is an attempt, based on world literature and our own research experience, to summarize, systematize, add, and clarify the existing terms, concepts and definitions related to research which are focused on sex and sexual reproduction in diatoms. A glossary of key terms (more than 200, including synonyms) is provided. Terms refer to diatom reproductive biology, life cycles, fertilization, mating system, gender (including inheritance and determination of sex, as well as inheritance associated with sex). Contradictions between possible interpretations of certain terms are briefly discussed.

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