Effect of temperature and irradiance on the growth and reproduction of the green macroalga, Chaetomorpha valida (Cladophoraceae, Chlorophyta)

Abstract

Green tides" are vast accumulations of unattached green macroalgae associated with eutrophicated marine environments. It had major ecological and economic impacts globally, thus understanding of their detailed conditions was required to inform management decisions. Chaetomorpha valida (Cladophoraceae, Chlorophyta), as a fouling green alga, was found in aquaculture ponds along the coast of Dalian and Rongcheng cities, People's Republic of China in the past few years. Seasonal abundances of this macroalga in China have presented a significant nuisance and caused great loss to the local aquaculture. Using unialgal cultures, the effect of temperature and irradiance on growth and reproduction were investigated. Healthy growth and reproduction occurred in the range of 17-29°C while the upper lethal limit was at 33°C. A suitable temperature range over 21-29°C and a relatively high irradiance of 108 μmol photons m −2 s −1 were more favorable for growth and reproduction. According to our observations, the diversity of reproductive approaches and wide adaption to temperature can be considered to be key factors that facilitate its excessive growth and colonization in spring and summer. Our results provide a basis for establishing a forecast system and taking remediation measures against seasonal green tides of this macroalga.

Effects of Chaetomorpha valida bloom development on the structure and succession of the phytoplankton community in Apostichopus japonicus culture ponds

“…since the phytoplankton population was correlated with temperature and light intensity, observations consistent with previous reports (Xing et al, 2019;Yan et al, 2014;Yunyan, Xiaorong, Bingxin, & Lanping, 2012). For bloom areas, environmental changes were more complicated because of the existence and variation of C. valida.…”

Factors that affect the growth and photosynthesis of the filamentous green algae, Chaetomorpha valida, in static sea cucumber aquaculture ponds with high salinity and high pH

“…The dominant species of filamentous green macroalgae are in the genera Ulva , Chaetomorpha , Cladophora , Enteromorpha , and Codium , which are characterized by rapid absorption of nutrients and high growth rates (Valiela et al, 1997; Anderson, Glibert & Burkholde, 2002; Zhang & Shao, 2013). In recent years, an invasive filamentous green algae, Chaetomorpha valida , has been found in sea cucumber aquaculture ponds (Chi et al, 2009; Deng et al, 2012).…”

High tolerance of Chaetomorpha sp. to salinity and water temperature enables survival and growth in stagnant waters of central Thailand

“…Eight species have been reported in Thailand, most of which occur along the coast (Lewmanomont et al 1995;Lewmanomont and Ogawa 1995;Coppejans et al 2010;Hamano et al 2012;Tsutsui et al 2012), whereas some occur in stagnant waters, including aquaculture ponds, aqueducts, and reservoirs, in the mangrove hinterlands . Chaetomorpha are often included in the results of floral surveys because the genus is very common in coastal areas; however, very little ecophysiological information is available for this taxon (de Paula Silva et al 2008;Xu and Lin 2008;Deng et al 2012). …”