

FOLLOWUS
1.State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou 570228, China
2.College of Marine Sciences, Hainan University, Haikou 570228, China
3.Hainan Research Academy of Environmental Sciences, Haikou 571126, China
liuzhiyuan111@hainanu.edu.cn
Received:15 August 2022,
Accepted:15 October 2022,
Online First:07 November 2022,
Published:01 November 2023
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LI Zihao,FU Dejiang,LÜ Shuguo,et al.Interaction between macroalgae and microplastics: Caulerpa lentillifera and Gracilaria tenuistipitata as microplastic bio-elimination vectors[J].Journal of Oceanology and Limnology,2023,41(06):2249-2261.
The pollution of microplastics (MPs) in the ocean has become a serious matter of concern. The farmed seaweeds (
Caulerpa
lentillifera
and
Gracilaria
tenuistipitata
) were selected to study their ability of adsorption with two typical classes of MPs (polyamides and polystyrene)
thereby revealing the interaction between MPs and macroalgae and exploring novel methods of removing MPs from macroalgae. The results demonstrate that polyamides (PA) fibers had no effect on the various physiological parameters of both seaweeds (e.g.
relative growth rate
photosynthetic oxygen evolution rate
the contents of malondialdehyde and extracellular polymeric substances) after 7 days of exposure
except for the chlorophyll-
a
concentration. However
the effects of polystyrene (PS) particles on the algae were strongly associated with the concentration of MPs exposure. Exposed to the high concentration (100 mg/L) of PS particles
the relative growth rate of
C
.
lentillifera
and
G
.
tenuistipitata
decreased by 54.56% and 30.62%
respectively
compared to the control
while no significant (
P
>
0.05) harmful effect of PS particles on seaweeds was observed in an environment with a low content of PS particles (25 mg/L). The PS particles in concentration of 100 mg/L significantly (
P
<
0.05) inhibited photosynthetic oxygen evolution rate and extracellular polymeric substances (EPS) contents in both seaweeds
but increased malondialdehyde (MDA) contents. When exposed for 72 h
the MPs adhesion rate of
G
.
tenuistipitata
is higher than that of
C
.
lentillifera
which might be due to the higher EPS content of
G
.
tenuistipitata
. The MPs desorption experiment indicated that the combination of dewatering and washing had the highest desorption rate of MPs which could reach to 91.45% and 87.23% for
C
.
lentillifera
and
G
.
tenuistipitata
respectively. This research demonstrates the potential of macroalgae as a vector for MPs in aquatic environment and provides methodological insights into decontamination procedures for removing the MPs from macroalgae.
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