88
T. A. Aragaw and B. A. Mekonnen
composition of juvenile jacopever (Sebastes schlegelii) for 3 weeks. The fish were
treated with PS and showed inferior sympathy to the added food in the tank, and
greatly declining feeding activity of the fish. Remarkably, the MPs treated-fish noticeably reduced swimming haste and variety of movement, proving that PS-MPs could
harm hunting behavior. Furthermore, PS-MPs accumulated in the gills and intestine,
triggering major histopathological alterations in the gallbladder and liver [70].
Lie et al. [71] explored the toxic effects of five types of MPs: PA, PE, PP, PVC, and
PS particles on Caenorhabditis Elegans and zebrafish Danio rerio. Results showed
an exposure concentration of 0.001–10.0 mg/L specified MPs for 10 d has no or low
lethality in D. rerio. However, such MPs with ~70-μm size instigated cracking of
villi as well as splitting of enterocytes leading to internal organ damage of D. rerio. In
addition, exposure to 5.0 mg/L above-mentioned MPs for 2 d remarkably inhibited
survival rates, body length, and reproduction of C. elegans. Moreover, exposure to
MPs decreased calcium levels and increased the appearance of the glutathione Stransferase enzyme in the intestine in C. elegans. Among MPs (0.1, 1.0, and 5.0-μm)
sizes of PS, the 1.0-μm particles produced the maximum mortality, the maximum
buildup of PS in nematodes, the lowest Ca
2+ level, and the maximum appearance of
glutathione S-transferase in nematodes. This shows the effects and toxicity of MPs
closely dependent on their size [71].
5.2 Toxicity Effects on the Behavioral Pattern
The disorder of behavior, fertility, and survival of aquatic biota is considered as
the final toxicological effect under stress from anthropogenic adaptations to the
environment [72]. To point out severe toxicology impacts of MPs, Wong and Candolin
[72] investigate a potential exposure pathway of (PVC) particles (1–50-μm) to Asian
green mussel Perna Viridis. Indeed, the mussel was exposed to concentrations ranges
0 mg/l–2160 mg/l in ten folds intervals of PVC for 2-hour-time-periods per day. Later
on, after 91 days of exposure to PVC, mussel survival declined with increasing PVC
concentration. In a similar investigation, PVC caused the mortality of the Asian green
mussel Perna Viridis due to remarkable energy reserve depletion [73].
Similarly, Ziajahromi et al. [74] studied the acute and chronic toxicity of PS
fibers and PE beads on freshwater zooplankton Ceriodaphnia dubia for 48 h and
8 days, respectively. Meanwhile, acute exposure to fibers and beads indicated a
negative impact on the survival of species in a dose-dependent manner. The binary
combination of beads and fibers caused antagonistic effects than additive effects.
But, the acute exposure of C. dubia to PE beads and polyester fibers induced 40%
mortality with increasing concentrations of the polymers. On the other hand, chronic
exposure to fibers indicated more adverse effects than PE beads. In the long run,
the exposure to fibers MPs poses a severe risk to C. dubia, with reduced fertility
rate at environmentally relevant concentration. As a result, the chronic exposure
of C. dubia to MP fibers on energy loss and physical damage, leading to reduced
growth and reproduction. Moreover, chronic exposure of both PE beads and PS fibers
T. A. Aragaw and B. A. Mekonnen
composition of juvenile jacopever (Sebastes schlegelii) for 3 weeks. The fish were
treated with PS and showed inferior sympathy to the added food in the tank, and
greatly declining feeding activity of the fish. Remarkably, the MPs treated-fish noticeably reduced swimming haste and variety of movement, proving that PS-MPs could
harm hunting behavior. Furthermore, PS-MPs accumulated in the gills and intestine,
triggering major histopathological alterations in the gallbladder and liver [70].
Lie et al. [71] explored the toxic effects of five types of MPs: PA, PE, PP, PVC, and
PS particles on Caenorhabditis Elegans and zebrafish Danio rerio. Results showed
an exposure concentration of 0.001–10.0 mg/L specified MPs for 10 d has no or low
lethality in D. rerio. However, such MPs with ~70-μm size instigated cracking of
villi as well as splitting of enterocytes leading to internal organ damage of D. rerio. In
addition, exposure to 5.0 mg/L above-mentioned MPs for 2 d remarkably inhibited
survival rates, body length, and reproduction of C. elegans. Moreover, exposure to
MPs decreased calcium levels and increased the appearance of the glutathione Stransferase enzyme in the intestine in C. elegans. Among MPs (0.1, 1.0, and 5.0-μm)
sizes of PS, the 1.0-μm particles produced the maximum mortality, the maximum
buildup of PS in nematodes, the lowest Ca
2+ level, and the maximum appearance of
glutathione S-transferase in nematodes. This shows the effects and toxicity of MPs
closely dependent on their size [71].
5.2 Toxicity Effects on the Behavioral Pattern
The disorder of behavior, fertility, and survival of aquatic biota is considered as
the final toxicological effect under stress from anthropogenic adaptations to the
environment [72]. To point out severe toxicology impacts of MPs, Wong and Candolin
[72] investigate a potential exposure pathway of (PVC) particles (1–50-μm) to Asian
green mussel Perna Viridis. Indeed, the mussel was exposed to concentrations ranges
0 mg/l–2160 mg/l in ten folds intervals of PVC for 2-hour-time-periods per day. Later
on, after 91 days of exposure to PVC, mussel survival declined with increasing PVC
concentration. In a similar investigation, PVC caused the mortality of the Asian green
mussel Perna Viridis due to remarkable energy reserve depletion [73].
Similarly, Ziajahromi et al. [74] studied the acute and chronic toxicity of PS
fibers and PE beads on freshwater zooplankton Ceriodaphnia dubia for 48 h and
8 days, respectively. Meanwhile, acute exposure to fibers and beads indicated a
negative impact on the survival of species in a dose-dependent manner. The binary
combination of beads and fibers caused antagonistic effects than additive effects.
But, the acute exposure of C. dubia to PE beads and polyester fibers induced 40%
mortality with increasing concentrations of the polymers. On the other hand, chronic
exposure to fibers indicated more adverse effects than PE beads. In the long run,
the exposure to fibers MPs poses a severe risk to C. dubia, with reduced fertility
rate at environmentally relevant concentration. As a result, the chronic exposure
of C. dubia to MP fibers on energy loss and physical damage, leading to reduced
growth and reproduction. Moreover, chronic exposure of both PE beads and PS fibers