Pelagic microalgae as suitable diets for the benthic harpacticoid copepod Tigriopus japonicus

Abstract

It has been reported that certain microalgae have the ability to cause various negative effects on pelagic calanoid copepods. However, whether such pelagic microalgae have similar negative effects on benthic copepods has had little attention. The results of the present study indicated that both benthic naupliar and copepodite stages of the harpacticoid copepod Tigriopus japonicus could effectively utilize five species of pelagic microalgae to complete their development. The effects of different concentrations of various microalgae species on naupliar survival were significant; however, no significant effects on copepodite survival were detected. When fed with two diatoms Chaetoceros muelleri and Skeletonema costatum as well as the dinoflagellate Prorocentrum micans and the chrysophyte Isochrysis galbana at high concentrations (C8.50 lgC ml -1 ), the survival of both naupliar and copepodite stages of T. japonicus was more than 90%. However, when the diatom Nitzschia closterium f. minutissima was fed at the high concentrations of 8.50 lgC ml -1 , the naupliar survival was 76.3 ± 3.2 %. Interestingly, the negative effects of N. closterium f. minutissima as a diet in the naupliar stage did not affect the survival of the copepodites, which may be explained by increased mobility of copepodites.

On the bioconversion of dietary carotenoids to astaxanthin and its distribution in the marine copepod, Tigriopus californicus

“…In the wild, copepods that feed on micro and macro algae ingest relatively large quantities of β-carotene, zeaxanthin, and lutein (Brown and Jeffrey 1992; Buffan-dubau et al 1996; Sigaud-Kutner et al 2005; Takaichi 2011; Wang et al 2015). The bioconversion of dietary carotenoids to astaxanthin has been documented in other copepod species (Rhodes 2007; Caramujo et al 2012), crustaceans (Hsu et al 1970; Tanaka et al 1976) and fish (Hsu et al 1972) and these authors have concluded that the pathway begins with β-carotene.…”

Comparative study on the effects of two diatoms as diets on planktonic calanoid and benthic harpacticoid copepods

“…Unlike diatoms, I. galbana is known as a nontoxic and excellent diet for marine copepods (Carotenuto et al., ; Li, Sun, Li, Pu, & Zhang, ; Wang et al., ). This study confirmed this since survival rates of all three copepods were high at all I. galbana feeding concentrations (>65.0 %).…”

“…The cultures were slowly scaled up to 2 L flasks. T. japonicus were from a stock culture kept in this laboratory for many years (Wang et al., ). All copepod stock cultures used 0.45 μm filtered seawater and I. galbana was provided at 1.00 μgC/ml to feed the copepods.…”

Coastal Microbiomes Reveal Associations between Pathogenic Vibrio Species, Environmental Factors, and Planktonic Communities

“…We observed positive correlations between pathogenic Vibrio spp., particularly those found in lower salinities, and several copepod genera (Additional File 14D). A copepod annotated as Pseudodiaptamus inopinus, an invasive species originating in Asia [90], was not significantly associated with any Vibrio species across all samples but was highly relatively abundant during the months where the highest levels of V. cholerae and V. vulnificus were detected at LPL and the SDR sites ( Figure 5B, Additional File 14C), and where the highest V. parahaemolyticus abundances were documented at the TJ sites. Other abundant copepods were the Harpacticoid genera Canuella and Tigriopus, both positively associated with V. vulnificus and the virulenceassociated gene pilF (Additional File 14C,D).…”

“…In laboratory studies, the type IV pilus (containing the pilF subunit) has been shown to be involved in chitin attachment to Vibrio spp. [89][90][91].…”