Alexandrium catenella cyst dynamics in a coastal embayment : temperature dependence of dormancy, germination, and bloom Initiation

Fischer, Alexis D.

doi:10.1575/1912/9058

Cited by 3 publications

(2 citation statements)

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“…Unlike 2012, however, a series of cold spells during the bloom's development kept water temperatures below 10 °C for most of April, extending germling production by prolonging cyst quiescence. Continued germination likely led to the renewal or second phase of the 2016 bloom in early May, and a second sexual induction-linked bloom peak and decline in mid-May (Brosnahan et al, 2017;Fischer, 2017). These results are instructive in that they emphasize the importance of cyst bed quiescence for the window of opportunity hypothesis.…”

Section: Importance Of New Resting Cyst Formation and Limits To Bloom Intensificationmentioning

confidence: 72%

Cyst-forming dinoflagellates in a warming climate

et al. 2020

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Many phytoplankton species, including many harmful algal bloom (HAB) species, survive long periods between blooms through formation of benthic resting stages. Because they are crucial to the persistence of these species and the initiation of new blooms, the physiology of benthic stages must be considered to accurately predict responses to climate warming and associated environmental changes. The benthic stages of dinoflagellates, called resting cysts, germinate in response to the combination of favorable temperature, oxygen-availability, and release from dormancy. The latter is a mechanism that prevents germination even when oxygen and temperature conditions are favorable. Here, evidence of temperature-mediated control of dormancy duration from the dinoflagellates Alexandrium catenella and Pyrodinium bahamense-two HAB species that cause paralytic shellfish poisoning (PSP)-is reviewed and presented alongside new evidence of complementary, temperature-based control of cyst quiescence (the state in which cysts germinate on exposure to favorable conditions). Interaction of the two temperature-based mechanisms with climate is explored through a simple model parameterized using results from recent experiments with A. catenella. Simulations demonstrate the importance of seasonal temperature cycles for the synchronization of cysts' release from dormancy and are consistent with biogeography-based inferences that A. catenella is more tolerant of warming in habitats that experience a larger range of seasonal temperature variation (i.e., have higher temperature seasonality). Temperature seasonality is much greater in shallow, long-residence time habitats than in deep, open-water ones. As warming shifts species' ranges, cyst beds may persist longer in more seasonally variable, shallow inshore habitats than in deep offshore ones, promoting HABs that are *

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Section: Importance Of New Resting Cyst Formation and Limits To Bloom Intensificationmentioning

confidence: 72%

Cyst-forming dinoflagellates in a warming climate

et al. 2020

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“…Cysts were collected from the sediment-water interface down to 3 cm. Because cyst concentrations within the 0 to 3 cm layer are generally greater subsurface ( 39 , 40 ) and only a fraction of cysts from the top surface mm germinate from undisturbed sediment ( 40 ), most of the cysts collected for these experiments were presumed to be inhibited by anaerobiosis ( 10 ). The collected cysts were from several different year classes due to physical mixing and bioturbation processes in this environment.…”

Section: Methodsmentioning

confidence: 99%