The Effects of Salinity on the Filtration Rates of Juvenile Tropical Oyster Crassostrea iredalei

Chang, Geraldine Olive; Lai, Ven Inn; Shau-Hwai, Aileen Tan; Yasin, Zulfigar

doi:10.21315/tlsr2016.27.3.7

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…Effect of Salinity. The reduced feeding rates of P. arctata under extreme salinities, as well as the frequent closure of valves at the highest salinity tested, are in agreement to previous reports [30,61,[69][70][71][72][73]. These responses seem to be strategies for minimize the contact with the surrounding water and the consequent osmotic interchange.…”

Section: Discussionsupporting

confidence: 92%

Energetic Physiology of the Caribbean Estuarine Clam Polymesoda arctata (Deshayes, 1854) Exposed to Different Environmental Conditions under Laboratory

Benitez-Polo,

Gómez-Gómez,

Velasco

2023

Aquaculture Research

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The estuarine clam Polymesoda arctata is one of the commercially important bivalves of the Caribbean, which is currently considered endangered by overexploitation and habitat loss. With the purpose of gain knowledge about its environmental requirements for aquaculture and restocking purposes, its energetic physiology performance was evaluated under laboratory conditions in response to the variation of food concentration and water quality registered in their natural habitat. Different physiological variables, including the rates of filtration (FR), pseudofeces production (RR), ingestion (IR), absorption (AR), oxygen consumption (OCR), and ammonium excretion (UR), as well as absorption efficiency (AE) and scope for growth (SFG), were estimated in five successive experiments, where different concentration levels of food or particulate organic matter (1.8, 4.0, 7.3, and 13.0 mg L−1 equivalent to 2.3, 5.0, 9.3, and 16.6 mg of the microalgae Isochrysis galbana L−1), salinity (5, 15, and 25‰), temperature (27, 29, and 32°C), ammonia concentration (7, 48 and 77 µg NH3-N L−1), and dissolved oxygen saturation (24, 48, and 93%) were tested. Intermediate conditions of food concentration, salinity, and temperature resulted in higher values for most of the physiological variables measured, except for the higher values of OCR and UR obtained at low salinity, as well as the higher values of AE, AR, and SFG measured at low temperatures. Most of the physiological variables increased under conditions of lower ammonia concentrations and higher dissolved oxygen saturation in the water. Although this species exhibited physiological plasticity, tolerance, and enough energy for growth and reproduction under the environmental variations of its habitat, it also showed a high sensitivity to its environment, having the highest SFG values under intermediate conditions of particulate organic matter (7.2 mg L−1 or 9.3 mg of I. galbana L−1), salinity (15‰), and temperature (27–29°C), as well as at low ammonia concentration (7 μg NH3-N L−1) and high dissolved oxygen saturation (93%). Based on our results, we recommended the use of this values for reproductive conditioning of broodstock and juvenile culture in laboratory, and also as an input for selecting areas for aquaculture farming and restocking experiments.

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Section: Discussionsupporting

confidence: 92%

Energetic Physiology of the Caribbean Estuarine Clam Polymesoda arctata (Deshayes, 1854) Exposed to Different Environmental Conditions under Laboratory

Benitez-Polo,

Gómez-Gómez,

Velasco

2023

Aquaculture Research

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“…Assuming the four annotated transcripts up‐regulated in LL and down‐regulated in OP and M at 5 ppt influence hyposmotic tolerance (Figure ), we hypothesize proteins encoded by these transcripts function to increase movements of branchial muscles and gill cilia that generate water currents and facilitate gas exchange within the oyster mantle cavity (Carroll & Catapane, ). An increased capacity for LL oysters to circulate fluid within the mantle cavity could lead to higher survival rates in low salinity seawater if as a result LL oysters are able to extend the period of valve closure relative to oysters from OP or M. Valve closure caused by exposure to dilute seawater impedes salt loss and water penetration, but prevents acquisition of oxygen from surrounding seawater and constrains filter feeding (Alagarswami & Victor, ; Berger & Kharazova, ; Chang et al., ). Consequently, this adaptive behaviour is time‐limited, and in the case of O. lurida , mortality during freshwater flooding probably results from lack of oxygen during valve closure and/or loss of osmotic homoeostasis upon valve opening.…”

Section: Discussionmentioning

confidence: 99%

“…Salinity declines also have considerable sub-lethal consequences for O. lurida. Exposure to seawater below 25 parts per thousand (ppt) is negatively correlated with key metrics of oyster health, including average size, recruitment rate and growth (Chang, Inn, Hwai, & Yasin, 2016;Wasson et al, 2014).…”

mentioning

confidence: 99%

Transcriptomic responses to extreme low salinity among locally adapted populations of Olympia oyster (Ostrea lurida)

et al. 2018

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The Olympia oyster (Ostrea lurida) is a foundation species inhabiting estuaries along the North American west coast. In California estuaries, O. lurida is adapted to local salinity regimes and populations differ in low salinity tolerance. In this study, oysters from three California populations were reared for two generations in a laboratory common garden and subsequently exposed to low salinity seawater. Comparative transcriptomics was then used to understand species-level responses to hyposmotic stress and population-level mechanisms underlying divergent salinity tolerances. Gene expression patterns indicate Olympia oysters are sensitive to hyposmotic stress: All populations respond to low salinity by up-regulating transcripts indicative of protein unfolding, DNA damage and cell cycle arrest after sub-lethal exposure. Among O. lurida populations, transcriptomic profiles differed constitutively and in response to low salinity. Despite two generations in common-garden conditions, transcripts encoding apoptosis modulators were constitutively expressed at significantly different levels in the most tolerant population. Expression of cell death regulators may facilitate cell fate decisions when salinity declines. Following low salinity exposure, oysters from the more tolerant population expressed a small number of mRNAs at significantly higher levels than less tolerant populations. Proteins encoded by these transcripts regulate ciliary activity within the mantle cavity and may function to prolong valve closure and reduce mortality in low salinity seawater. Collectively, gene expression patterns suggest sub-lethal impacts of hyposmotic stress in Olympia oysters are considerable and that even oysters with greater low salinity tolerance may be vulnerable to future freshwater flooding events.

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“…The effects of salinity on the physiology as well as the metal uptake by oysters were studied previously. For example, Olive et al determined the effects of salinity (15 to 45 psu) on the filtration rates of juvenile tropical oysters (Crassostrea iredalei), and the oysters displayed the lowest filtration rate at 15 or 45 psu. but they displayed the highest filtration rate at 35 psu.…”

Section: Resultsmentioning

confidence: 99%

Zn Isotope Fractionation in the Oyster Crassostrea hongkongensis and Implications for Contaminant Source Tracking

Wang

et al. 2019

Environ. Sci. Technol.

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Variations in stable isotope ratios have been used to trace sources of contaminants as well as their biogeochemical pathways in the environment. In this study, we investigated the influences of internal redistribution among tissues and ambient water conditions on Zn isotope fractionation in oysters. There was no significant difference in Zn isotope ratios during in vivo Zn transportation among various oyster tissues. Estuarine oysters were exposed to additional Zn either at different salinities or at different Zn concentrations, following which the Zn isotope ratios in the oysters were measured. Results showed no significant difference in δ66/64Zn values in the oysters exposed at different salinities. Tissue Zn accumulation increased with increasing Zn levels in water over the 30 day exposure. Within this period, there was a nearly 0.3‰ difference in averaged δ66/64Zn values in the exposed oysters compared to the initial δ66/64Zn values in the oysters prior to exposure. However, there was no evidence of significant difference in δ66/64Zn values in oysters exposed at different Zn levels, with postexposure signatures similar to the δ66/64Zn values of the Zn solution added. Our results suggested that the δ66/64Zn values measured in the oysters were approaching the δ66/64Zn values of the “source” faster with increasing Zn concentrations added in the water. This study highlighted the absence of Zn isotope fractionation during Zn internal distribution and in vivo transport in oysters. The calculation of the contributions of different Zn sources demonstrated that oysters can be a sentinel animal for Zn source tracking in marine environments.

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The Effects of Salinity on the Filtration Rates of Juvenile Tropical Oyster Crassostrea iredalei

Cited by 13 publications

References 9 publications

Energetic Physiology of the Caribbean Estuarine Clam Polymesoda arctata (Deshayes, 1854) Exposed to Different Environmental Conditions under Laboratory

Energetic Physiology of the Caribbean Estuarine Clam Polymesoda arctata (Deshayes, 1854) Exposed to Different Environmental Conditions under Laboratory

Transcriptomic responses to extreme low salinity among locally adapted populations of Olympia oyster (Ostrea lurida)

Zn Isotope Fractionation in the Oyster Crassostrea hongkongensis and Implications for Contaminant Source Tracking

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