

FOLLOWUS
1.School of Construction and Ecology, Shantou Polytechnic, Shantou 515078, China
2.School of Life Sciences, Xiamen University, Xiamen 361102, China
3.Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Marine Sciences, Guangxi Academy of Sciences, Nanning 530007, China
sunlin@xmu.edu.cn
gaoyh@xmu.edu.cn
Received:29 November 2023,
Online First:03 June 2024,
Published:01 May 2025
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LIN Jinchun,LI Lang,LI Xuesong,et al.Experimental study on interaction between epizoic diatoms and Pseudodiaptomus annandalei[J].Journal of Oceanology and Limnology,2025,43(03):803-816.
LIN Jinchun,LI Lang,LI Xuesong,et al.Experimental study on interaction between epizoic diatoms and Pseudodiaptomus annandalei[J].Journal of Oceanology and Limnology,2025,43(03):803-816. DOI: 10.1007/s00343-024-3191-0.
The epizoic diatoms
especifically those living at the body surface of copepods has not garnered sufficient attention. This study focuses on the copepod
Pseudodiaptomus
annandalei
and three epizoic diatom species isolated from its body surface:
Pseudofalcula
hyalina
Haslea
sp.
and
Tabularia
sp. The research explored the physiological and biochemical characteristics of diatoms under co-cultivation conditions with
P
.
annandalei
and different species of epizoic diatoms
along with variations in copepod survival rates. Results reveal that the growth rate
cell density
and chlorop
hyll-
a
content of the three epizoic diatoms were enhanced by
P
.
annandalei
. The photosynthesis of epizoic diatoms
particularly the photochemical efficiency of PSⅡ (
F
v
/
F
m
) of
P
.
hyalina
was positively influenced by
P
.
annandalei
. The impact of
P
.
annandalei
on biochemical compositions exhibited species-specific characteristics. Under co-culture conditions
the content of polysaccharides and proteins in the colloidal exopolymeric substance (CEPS) of
P
.
hyalina
and
Haslea
sp. increased
so did the intracellular protein content of
Tabularia
sp. The attachment of
P
.
hyalina
was most significantly influenced by
P
.
annandalei
followed by
Haslea
sp.
and then
Tabularia
sp.
likely due to the increased uronic acid content of
P
.
hyalina
under co-culture conditions. Moreover
the three epizoic diatoms might have served as food sources for
P
.
annandalei
as evidenced by the higher survival of copepods. The release of nitrate and phosphate from
P
.
annandalei
contributed to the nutrition for the growth of epizoic diatoms
indicating that the bottom-up effect resulting from
P
.
annandalei
excretion nutrition was greater than the top-down effect from predation.
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