Influence of environmental conditions on the toxicokinetics of cadmium in the marine copepod Acartia tonsa

Maria D. Pavlaki, Rui G. Morgado, Cornelis A.M. van Gestel, Ricardo Calado, Amadeu M.V.M. Soares, Susana Loureiro

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

mMarine and estuarine ecosystems are highly productive areas that often act as a final sink for several pollutants, such as cadmium. Environmental conditions in these habitats can affect metal speciation, as well as its uptake and depuration by living organisms. The aim of this study was to assess cadmium uptake and depuration rates in the euryhaline calanoid copepod Acartia tonsa under different pH, salinity and temperature conditions. Cadmium speciation did not vary with changing pH or temperature, but varied with salinity. Free Cd2+ ion activity increased with decreasing salinities resulting in increased cadmium concentrations in A. tonsa. However, uptake rate, derived using free Cd2+ ion activity, showed no significant differences at different salinities indicating a simultaneous combined effect of Cd2+ speciation and metabolic rates for osmoregulation. Cadmium concentration in A. tonsa and uptake rate increased with increasing pH, showing a peak at the intermediate pH of 7.5, while depuration rate fluctuated, thus suggesting that both parameters are mediated by metabolic processes (to maintain homeostasis at pH levels lower than normal) and ion competition at membrane binding sites. Cadmium concentration in A. tonsa, uptake and depuration rates increased with increasing temperature, a trend that can be attributed to an increase in metabolic energy demand at higher temperatures. The present study shows that cadmium uptake and depuration rates in the marine copepod A. tonsa is mostly affected by biological processes, mainly driven by metabolic mechanisms, and to a lesser extent by metal speciation in the exposure medium.

Original languageEnglish
Pages (from-to)142-149
Number of pages8
JournalEcotoxicology and Environmental Safety
Volume145
DOIs
Publication statusPublished - 1 Nov 2017

Fingerprint

Copepoda
Cadmium
Salinity
Temperature
Ions
Ecosystem
Metals
Biological Phenomena
Osmoregulation
Aquatic ecosystems
Binding sites
Toxicokinetics
Homeostasis
Binding Sites
Membranes

Keywords

  • Abiotic factors
  • Bioconcentration
  • Chemical speciation
  • Depuration rate
  • Metal
  • Uptake rate

Cite this

Pavlaki, Maria D. ; Morgado, Rui G. ; van Gestel, Cornelis A.M. ; Calado, Ricardo ; Soares, Amadeu M.V.M. ; Loureiro, Susana. / Influence of environmental conditions on the toxicokinetics of cadmium in the marine copepod Acartia tonsa. In: Ecotoxicology and Environmental Safety. 2017 ; Vol. 145. pp. 142-149.
@article{5833094389ca4d258ea21ec4f4155208,
title = "Influence of environmental conditions on the toxicokinetics of cadmium in the marine copepod Acartia tonsa",
abstract = "mMarine and estuarine ecosystems are highly productive areas that often act as a final sink for several pollutants, such as cadmium. Environmental conditions in these habitats can affect metal speciation, as well as its uptake and depuration by living organisms. The aim of this study was to assess cadmium uptake and depuration rates in the euryhaline calanoid copepod Acartia tonsa under different pH, salinity and temperature conditions. Cadmium speciation did not vary with changing pH or temperature, but varied with salinity. Free Cd2+ ion activity increased with decreasing salinities resulting in increased cadmium concentrations in A. tonsa. However, uptake rate, derived using free Cd2+ ion activity, showed no significant differences at different salinities indicating a simultaneous combined effect of Cd2+ speciation and metabolic rates for osmoregulation. Cadmium concentration in A. tonsa and uptake rate increased with increasing pH, showing a peak at the intermediate pH of 7.5, while depuration rate fluctuated, thus suggesting that both parameters are mediated by metabolic processes (to maintain homeostasis at pH levels lower than normal) and ion competition at membrane binding sites. Cadmium concentration in A. tonsa, uptake and depuration rates increased with increasing temperature, a trend that can be attributed to an increase in metabolic energy demand at higher temperatures. The present study shows that cadmium uptake and depuration rates in the marine copepod A. tonsa is mostly affected by biological processes, mainly driven by metabolic mechanisms, and to a lesser extent by metal speciation in the exposure medium.",
keywords = "Abiotic factors, Bioconcentration, Chemical speciation, Depuration rate, Metal, Uptake rate",
author = "Pavlaki, {Maria D.} and Morgado, {Rui G.} and {van Gestel}, {Cornelis A.M.} and Ricardo Calado and Soares, {Amadeu M.V.M.} and Susana Loureiro",
year = "2017",
month = "11",
day = "1",
doi = "10.1016/j.ecoenv.2017.07.008",
language = "English",
volume = "145",
pages = "142--149",
journal = "Ecotoxicology and Environmental Safety",
issn = "0147-6513",
publisher = "Academic Press Inc.",

}

Influence of environmental conditions on the toxicokinetics of cadmium in the marine copepod Acartia tonsa. / Pavlaki, Maria D.; Morgado, Rui G.; van Gestel, Cornelis A.M.; Calado, Ricardo; Soares, Amadeu M.V.M.; Loureiro, Susana.

In: Ecotoxicology and Environmental Safety, Vol. 145, 01.11.2017, p. 142-149.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

T1 - Influence of environmental conditions on the toxicokinetics of cadmium in the marine copepod Acartia tonsa

AU - Pavlaki, Maria D.

AU - Morgado, Rui G.

AU - van Gestel, Cornelis A.M.

AU - Calado, Ricardo

AU - Soares, Amadeu M.V.M.

AU - Loureiro, Susana

PY - 2017/11/1

Y1 - 2017/11/1

N2 - mMarine and estuarine ecosystems are highly productive areas that often act as a final sink for several pollutants, such as cadmium. Environmental conditions in these habitats can affect metal speciation, as well as its uptake and depuration by living organisms. The aim of this study was to assess cadmium uptake and depuration rates in the euryhaline calanoid copepod Acartia tonsa under different pH, salinity and temperature conditions. Cadmium speciation did not vary with changing pH or temperature, but varied with salinity. Free Cd2+ ion activity increased with decreasing salinities resulting in increased cadmium concentrations in A. tonsa. However, uptake rate, derived using free Cd2+ ion activity, showed no significant differences at different salinities indicating a simultaneous combined effect of Cd2+ speciation and metabolic rates for osmoregulation. Cadmium concentration in A. tonsa and uptake rate increased with increasing pH, showing a peak at the intermediate pH of 7.5, while depuration rate fluctuated, thus suggesting that both parameters are mediated by metabolic processes (to maintain homeostasis at pH levels lower than normal) and ion competition at membrane binding sites. Cadmium concentration in A. tonsa, uptake and depuration rates increased with increasing temperature, a trend that can be attributed to an increase in metabolic energy demand at higher temperatures. The present study shows that cadmium uptake and depuration rates in the marine copepod A. tonsa is mostly affected by biological processes, mainly driven by metabolic mechanisms, and to a lesser extent by metal speciation in the exposure medium.

AB - mMarine and estuarine ecosystems are highly productive areas that often act as a final sink for several pollutants, such as cadmium. Environmental conditions in these habitats can affect metal speciation, as well as its uptake and depuration by living organisms. The aim of this study was to assess cadmium uptake and depuration rates in the euryhaline calanoid copepod Acartia tonsa under different pH, salinity and temperature conditions. Cadmium speciation did not vary with changing pH or temperature, but varied with salinity. Free Cd2+ ion activity increased with decreasing salinities resulting in increased cadmium concentrations in A. tonsa. However, uptake rate, derived using free Cd2+ ion activity, showed no significant differences at different salinities indicating a simultaneous combined effect of Cd2+ speciation and metabolic rates for osmoregulation. Cadmium concentration in A. tonsa and uptake rate increased with increasing pH, showing a peak at the intermediate pH of 7.5, while depuration rate fluctuated, thus suggesting that both parameters are mediated by metabolic processes (to maintain homeostasis at pH levels lower than normal) and ion competition at membrane binding sites. Cadmium concentration in A. tonsa, uptake and depuration rates increased with increasing temperature, a trend that can be attributed to an increase in metabolic energy demand at higher temperatures. The present study shows that cadmium uptake and depuration rates in the marine copepod A. tonsa is mostly affected by biological processes, mainly driven by metabolic mechanisms, and to a lesser extent by metal speciation in the exposure medium.

KW - Abiotic factors

KW - Bioconcentration

KW - Chemical speciation

KW - Depuration rate

KW - Metal

KW - Uptake rate

UR - http://www.scopus.com/inward/record.url?scp=85024497361&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85024497361&partnerID=8YFLogxK

U2 - 10.1016/j.ecoenv.2017.07.008

DO - 10.1016/j.ecoenv.2017.07.008

M3 - Article

VL - 145

SP - 142

EP - 149

JO - Ecotoxicology and Environmental Safety

JF - Ecotoxicology and Environmental Safety

SN - 0147-6513

ER -