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Semmouri I, De Schamphelaere KAC, Van Nieuwerburgh F, Deforce D, Janssen CR, Asselman J. Contribution of combined stressors on density and gene expression dynamics of the copepod Temora longicornis in the North Sea. Mol Ecol 2024:e17312. [PMID: 38426368 DOI: 10.1111/mec.17312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 02/16/2024] [Accepted: 02/21/2024] [Indexed: 03/02/2024]
Abstract
The impact of multiple environmental and anthropogenic stressors on the marine environment remains poorly understood. Therefore, we studied the contribution of environmental variables to the densities and gene expression of the dominant zooplankton species in the Belgian part of the North Sea, the calanoid copepod Temora longicornis. We observed a reduced density of copepods, which were also smaller in size, in samples taken from nearshore locations when compared to those obtained from offshore stations. To assess the factors influencing the population dynamics of this species, we applied generalised additive models. These models allowed us to quantify the relative contribution of temperature, nutrient levels, salinity, turbidity, concentrations of photosynthetic pigments, as well as chemical pollutants such as polychlorinated biphenyls and polycyclic aromatic hydrocarbons (PAHs), on copepod density. Temperature and Secchi depth, a proxy for turbidity, were the most important environmental variables predicting the densities of T. longicornis, followed by summed PAH and chlorophyll concentrations. Analysing gene expression in field-collected adults, we observed significant variation in metabolic and stress-response genes. Temperature correlated significantly with genes involved in proteolytic activities, and encoding heat shock proteins. Yet, concentrations of anthropogenic chemicals did not induce significant differences in the gene expression of genes involved in the copepod's fatty acid metabolism or well-known stress-related genes, such as glutathione transferases or cytochrome P450. Our study highlights the potential of gene expression biomonitoring and underscores the significance of a changing environment in future studies.
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Affiliation(s)
- Ilias Semmouri
- Blue Growth Research Lab, Ghent University, Ostend, Belgium
- Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Karel A C De Schamphelaere
- Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Filip Van Nieuwerburgh
- Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Dieter Deforce
- Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Colin R Janssen
- Blue Growth Research Lab, Ghent University, Ostend, Belgium
- Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Jana Asselman
- Blue Growth Research Lab, Ghent University, Ostend, Belgium
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Olsvik PA, Meier S, Zhang X, Goksøyr A, Karlsen OA, Yadetie F. Environmentally realistic concentrations of chlorinated, brominated, and fluorinated persistent organic pollutants induce the unfolded protein response as a shared stress pathway in the liver of Atlantic cod (Gadus morhua). J Appl Toxicol 2023; 43:1859-1871. [PMID: 37528559 DOI: 10.1002/jat.4519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 06/23/2023] [Accepted: 07/05/2023] [Indexed: 08/03/2023]
Abstract
In the North Sea and North Atlantic coastal areas, fish experience relatively high background levels of persistent organic pollutants. This study aimed to compare the mode of action of environmentally relevant concentrations of mixtures of halogenated compounds in Atlantic cod. Juvenile male cod with mean weight of 840 g were exposed by gavage to dietary mixtures of chlorinated (PCBs, DDT analogs, chlordane, lindane, and toxaphene), brominated (PBDEs), and fluorinated (PFOS) compounds for 4 weeks. One group received a combined mixture of all three compound groups. The results showed that the accumulated levels of chemicals in cod liver after 4 weeks of exposure reflected concentrations found in wild fish in this region. Pathway analysis revealed that the treatment effects by each of the three groups of chemicals (chlorinated, brominated, and fluorinated) converged on activation of the unfolded protein response (UPR). Upstream regulator analysis predicted that almost all the key transcription factors (XBP1, ERN1, ATF4, EIF2AK3, and NFE2L2) regulating the UPR were significantly activated. No additive effect was observed in cod co-treated with all three compound groups. In conclusion, the genome-wide transcriptomic study suggests that the UPR pathway is a sensitive common target of halogenated organic environmental pollutants in fish.
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Affiliation(s)
- Pål A Olsvik
- Faculty of Biosciences and Aquaculture, Nord University, Bodø, Norway
- Institute of Marine Research, Bergen, Norway
| | | | - Xiaokang Zhang
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
| | - Anders Goksøyr
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Odd Andre Karlsen
- Department of Biological Sciences, University of Bergen, Bergen, Norway
| | - Fekadu Yadetie
- Department of Biological Sciences, University of Bergen, Bergen, Norway
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3
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Semmouri I, De Schamphelaere KAC, Mortelmans J, Mees J, Asselman J, Janssen CR. Decadal decline of dominant copepod species in the North Sea is associated with ocean warming: Importance of marine heatwaves. MARINE POLLUTION BULLETIN 2023; 193:115159. [PMID: 37329739 DOI: 10.1016/j.marpolbul.2023.115159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 05/31/2023] [Accepted: 06/06/2023] [Indexed: 06/19/2023]
Abstract
Time-series are crucial to understand the status of zooplankton communities and to anticipate changes that might affect the entire food web. Long-term time series allow us to understand impacts of multiple environmental and anthropogenic stressors, such as chemical pollution and ocean warming, on the marine ecosystems. Here, a recent time series (2018-2022) of abundance data of four dominant calanoid and one harpacticoid copepod species from the Belgian Part of the North Sea was combined with previously collected (2009-2010, 2015-2016) datasets for the same study area. The time series reveals a significant decrease (up to two orders of magnitude) in calanoid copepod abundance (Temora longicornis, Acartia clausi, Centropages spp., Calanus helgolandicus), while this was not the case for the harpacticoid Euterpina acutifrons. We applied generalized additive models to quantify the relative contribution of temperature, nutrients, salinity, primary production, turbidity and pollution (anthropogenic chemicals, i.e., polychlorinated biphenyls and polycyclic aromatic hydrocarbons) to the population dynamics of these species. Temperature, turbidity and chlorophyll a concentrations were the only variables consistently showing a relative high contribution in all models predicting the abundances of the selected species. The observed heat waves which occurred during the summer periods of the investigated years coincided with population collapses (versus population densities in non-heatwave years) and are considered the most likely cause for the observed copepod abundance decreases. Moreover, the recorded water temperatures during these heatwaves correspond to the physiological thermal limit of some of the studied species. As far as we know, this is the first study to observe ocean warming and marine heat waves having such a dramatic impact (population collapse) on the dominant zooplankton species in shallow coastal areas.
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Affiliation(s)
- Ilias Semmouri
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000 Ghent, Belgium; Blue Growth Research Lab, Ghent University, Bluebridge, Wetenschapspark 1, 8400 Ostend, Belgium.
| | - Karel A C De Schamphelaere
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000 Ghent, Belgium
| | - Jonas Mortelmans
- Flanders Marine Institute VLIZ, InnovOcean Campus, Jacobsenstraat, 8400 Ostend, Belgium
| | - Jan Mees
- Flanders Marine Institute VLIZ, InnovOcean Campus, Jacobsenstraat, 8400 Ostend, Belgium; Ghent University, Marine Biology Research Group, Faculty of Sciences, 9000 Ghent, Belgium
| | - Jana Asselman
- Blue Growth Research Lab, Ghent University, Bluebridge, Wetenschapspark 1, 8400 Ostend, Belgium
| | - Colin R Janssen
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000 Ghent, Belgium; Blue Growth Research Lab, Ghent University, Bluebridge, Wetenschapspark 1, 8400 Ostend, Belgium
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4
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de Oliveira GL, Viana‐Junior AB, Trindade PHS, dos Santos IR, de Almeida‐Maués PCR, Carvalho FG, Silva DP, Wiig Ø, Sena L, Mendes‐Oliveira AC. Wild canids and the ecological traps facing the climate change and deforestation in the Amazon Forest. Ecol Evol 2023; 13:e10150. [PMID: 37304361 PMCID: PMC10251424 DOI: 10.1002/ece3.10150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 05/09/2023] [Accepted: 05/11/2023] [Indexed: 06/13/2023] Open
Abstract
Ecological traps occur when species choose to settle in lower-quality habitats, even if this reduces their survival or productivity. This happens in situations of drastic environmental changes, resulting from anthropogenic pressures. In long term, this could mean the extinction of the species. We investigated the dynamics of occurrence and distribution of three canid species (Atelocynus microtis, Cerdocyon thous, and Spheotos venaticus) considering human threats to their habitats in the Amazon Rainforest. We analyzed the environmental thresholds for the occurrence of these species and related to the future projections of climatic niches for each one. All three species will be negatively affected by climate change in the future, with losses of up to 91% of the suitable area of occurrence in the Brazilian Amazon. A. microtis appear to be more forest-dependent and must rely on the goodwill of decision-makers to be maintained in the future. For C. thous and S. venaticus, climatic variables and those associated with anthropogenic disturbances that modulate their niches today may not act the same way in the future. Even though C. thous is least dependent on the Amazon Forest; this species may be affected in the future due to the ecological traps. S. venaticus, can also undergo the same process, but perhaps more drastically due to the lower ecological plasticity of this species compared to C. thous. Our results suggest that the ecological traps may put these two species at risk in the future. Using the canid species as a model, we had the opportunity to investigate these ecological effects that can affect a large part of the Amazonian fauna in the current scenario. Considering the high degree of environmental degradation and deforestation in the Amazon Rainforest, the theory of ecological traps must be discussed at the same level as the habitat loss, considering the strategies for preserving the Amazon biodiversity.
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Affiliation(s)
- Geovana Linhares de Oliveira
- Laboratório de Ecologia e Zoologia de Vertebrados – LABEV, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
| | - Arleu Barbosa Viana‐Junior
- Programa de Pós‐Graduação em Ecologia e Conservação da Universidade Estadual da Paraíba – UEPBCampina Grande – PBBrazil
| | - Paulo Henrique Santos Trindade
- Laboratório de Ecologia e Zoologia de Vertebrados – LABEV, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
| | - Iara Ramos dos Santos
- Laboratório de Ecologia e Zoologia de Vertebrados – LABEV, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
- Centro de Estudos Avançados da Biodiversidade – CEABIO, Parque Tecnológico do GuamáUniversidade Federal do ParáBelémParáBrazil
| | - Paula Cristina R. de Almeida‐Maués
- Laboratório de Ecologia e Zoologia de Vertebrados – LABEV, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
- Unama Parque ShoppingBelémParáBrazil
| | - Fernando Geraldo Carvalho
- Laboratório de Ecologia e Conservação – LABECO, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
| | - Daniel Paiva Silva
- COBIMA Lab, Departamento de Ciências Biológicas, Instituto Federal Goiano, Rodovia Geraldo Silva NascimentoUrutaíGoiásBrazil
| | - Øystein Wiig
- Natural History MuseumUniversity of OsloOsloNorway
| | - Leonardo Sena
- Centro de Estudos Avançados da Biodiversidade – CEABIO, Parque Tecnológico do GuamáUniversidade Federal do ParáBelémParáBrazil
| | - Ana Cristina Mendes‐Oliveira
- Laboratório de Ecologia e Zoologia de Vertebrados – LABEV, Instituto de Ciências BiológicasUniversidade Federal do ParáBelémParáBrazil
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Mendonça-Santos RG, Antoniazzi R, Camarota F, dos Reis YT, Viana-Junior AB. Scattered trees as crucial elements in maintaining urban diversity: A case study with canopy ants in a biodiversity hotspot. ACTA OECOLOGICA 2023. [DOI: 10.1016/j.actao.2023.103894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Copepod Assemblages in A Large Arctic Coastal Area: A Baseline Summer Study. DIVERSITY 2023. [DOI: 10.3390/d15010081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
To provide a baseline description of copepod assemblages in the Pechora Sea, an estuarine area with great economical and ecological importance, we conducted a survey during the summer season. A total of 24 copepod taxa were identified in the study, with Acartia longiremis, Calanus finmarchicus, Centropages hamatus, Copepoda nauplii, Eurytemora affinis, Oithona similis, Pseudocalanus spp., and Temora longicornis being the most numerous. The high diversity (Shannon index = 2.51 ± 0.06), density (18,720 ± 3376 individuals m−3) and biomass (89 ± 18 mg dry mass m−3) of copepods were revealed. Populations of common small copepod taxa were dominated by the young stages, indicating spawning, while older copepodites prevailed among medium- and large-sized species, showing that their reproduction occurred before our survey. Cluster analysis indicated three groups of stations that mainly differed in the abundance of particular species. There were clear associations between copepod assemblages and environmental variables. Statistical analyses showed significant correlations between copepod abundance and water temperature or sampling depth, while other factors had a lesser influence. Our results suggest a strong effect of local circulation and currents on the spatial pattern of the copepod assemblages in the study area. This study may be useful for future biomonitoring in the south-eastern Barents Sea.
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Moeris S, Vanryckeghem F, Demeestere K, De Schamphelaere KAC. Neonicotinoid Insecticides from a Marine Perspective: Acute and Chronic Copepod Testing and Derivation of Environmental Quality Standards. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2021; 40:1353-1367. [PMID: 33465261 DOI: 10.1002/etc.4986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 05/30/2020] [Accepted: 01/12/2021] [Indexed: 05/07/2023]
Abstract
Neonicotinoid insecticides have become of global concern for the aquatic environment. Harpacticoid copepods are among the organisms most sensitive to neonicotinoids. We exposed the brackish copepod Nitocra spinipes to 4 neonicotinoid insecticides (clothianidin, imidacloprid, thiacloprid, and thiamethoxam) to investigate acute toxicity on adults (96-h exposure) and effects on larval development (7-d exposure). We used these results in combination with publicly available ecotoxicity data to derive environmental quality standards (EQS). These EQS were ultimately used in a single-substance and mixture risk assessment for the Belgian part of the North Sea. Acute toxicity testing revealed that immobilization is a more sensitive endpoint than mortality, with 96-h median effect concentration (EC50) values of 6.9, 7.2, 25, and 120 µg L-1 for clothianidin, thiacloprid, imidacloprid, and thiamethoxam, respectively. In addition, the larval development tests resulted in 7-d no-observed-effect concentrations (NOECs) of 2.5, 2.7, 4.2, and >99 µg L-1 for clothianidin, thiacloprid, imidacloprid, and thiamethoxam, respectively. The derived saltwater annual average (AA-)EQS were 0.05, 0.0048, 0.002, and 0.016 µg L-1 for clothianidin, thiacloprid, imidacloprid, and thiamethoxam, respectively. Finally, the risk characterization revealed some exceedances of the AA-EQS in Belgian harbors for imidacloprid (number of exceedances, n = 2/4), for thiacloprid (n = 1/4), for thiamethoxam (n = 1/4), and for the mixture of the 4 neonicotinoids (n = 4/4), but not at the open sea. At the open sea site, the toxic unit sums relative to the AA-EQS were 0.72 and 0.22, suggesting no mixture risk, albeit with a relatively small margin of safety. Including short-term EC10 (96-h) values of N. spinipes for the AA-EQS derivation led to a refinement of the AA-EQS for clothianidin and thiamethoxam, suggesting their use for the AA-EQS derivation because one of the overarching goals of the definition of EQS is to protect species at the population level. Environ Toxicol Chem 2021;40:1353-1367. © 2021 SETAC.
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Affiliation(s)
- Samuel Moeris
- Department of Animal Sciences and Aquatic Ecology, Environmental Toxicology Unit (GhEnToxLab), Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Francis Vanryckeghem
- Department of Green Chemistry and Technology, Research Group Environmental Organic Chemistry and Technology (EnVOC), Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Kristof Demeestere
- Department of Green Chemistry and Technology, Research Group Environmental Organic Chemistry and Technology (EnVOC), Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Karel A C De Schamphelaere
- Department of Animal Sciences and Aquatic Ecology, Environmental Toxicology Unit (GhEnToxLab), Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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Hernández Ruiz L, Ekumah B, Asiedu DA, Albani G, Acheampong E, Jónasdóttir SH, Koski M, Nielsen TG. Climate change and oil pollution: A dangerous cocktail for tropical zooplankton. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 231:105718. [PMID: 33360235 DOI: 10.1016/j.aquatox.2020.105718] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 12/01/2020] [Accepted: 12/03/2020] [Indexed: 06/12/2023]
Abstract
Climate change and oil pollution pose a major threat to tropical marine ecosystems and to the coastal communities relying on their resources. The Gulf of Guinea is severely affected by multiple human induced stressors, but the potential impacts of these on marine productivity remain unknown. We investigated the combined effects of heatwaves (climate stressor) and the polycyclic aromatic hydrocarbon pyrene (proxy for oil) on the copepod Centropages velificatus. We quantified survival, reproduction and fecal pellet production of females exposed to concentrations of 0, 10, 100 and 100+ nM (saturated) pyrene under simulated heatwaves of different thermal intensity (+3 °C and +5 °C above control treatment temperature). Thermal stress due to both moderate and intensive heatwaves resulted in reduced survival and egg production. The negative effects of pyrene were only measurable at the high pyrene concentrations. However, thermal stress increased the sensitivity of C. velificatus to pyrene, indicating a synergistic interaction between the two stressors. We document that the interaction of multiple stressors can result in cumulative impacts that are stronger than expected based on single stressor studies. Further research is urgently needed to evaluate the combined impact of climatic and anthropogenic stressors on the productivity of coastal ecosystems, particularly in the tropical areas.
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Affiliation(s)
- Laura Hernández Ruiz
- National Institute of Aquatic Resource, Technical University of Denmark, Kemitorvet, Kongens Lyngby, Denmark
| | - Bernard Ekumah
- Centre for Coastal Management (CCM), University of Cape Coast, Cape Coast, Ghana
| | | | - Giovanna Albani
- National Institute of Aquatic Resource, Technical University of Denmark, Kemitorvet, Kongens Lyngby, Denmark
| | - Emmanuel Acheampong
- Centre for Coastal Management (CCM), University of Cape Coast, Cape Coast, Ghana
| | - Sigrún H Jónasdóttir
- National Institute of Aquatic Resource, Technical University of Denmark, Kemitorvet, Kongens Lyngby, Denmark; Centre for Coastal Management (CCM), University of Cape Coast, Cape Coast, Ghana
| | - Marja Koski
- National Institute of Aquatic Resource, Technical University of Denmark, Kemitorvet, Kongens Lyngby, Denmark
| | - Torkel Gissel Nielsen
- National Institute of Aquatic Resource, Technical University of Denmark, Kemitorvet, Kongens Lyngby, Denmark.
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Semmouri I, De Schamphelaere KAC, Van Nieuwerburgh F, Deforce D, Janssen CR, Asselman J. Spatio-temporal patterns in the gene expression of the calanoid copepod Temora longicornis in the Belgian part of the North Sea. MARINE ENVIRONMENTAL RESEARCH 2020; 160:105037. [PMID: 32907738 DOI: 10.1016/j.marenvres.2020.105037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/26/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
Marine zooplankton are increasingly being affected by recent environmental changes, such as climate change, and respond with profound spatial relocations and shifts in phenology and physiology. In order to predict whether populations are able to persist or adapt to such new conditions, it is essential to understand the molecular basis of such adaptations, which ultimately get translated into these physiological responses. To explore variation in population gene expression across time and space, we investigated transcriptome-level profiles of the calanoid copepod Temora longicornis, that were collected at four different locations in the Belgian Part of the North Sea (BPNS) on three different time points (April, June, October) in 2018. RNA-seq analysis of field collected adults identified large seasonal differences in gene expression, mainly between spring-summer and autumn samples. The largest log-fold changes occurred in a set of genes encoding for ribosomal and myosin (heavy chain) transcripts. Enrichment analysis revealed a strong seasonal pattern in vitellogenin, cuticle and glycolytic gene expression as well. We also found a positive correlation between vitellogenin expression and densities of T. longicornis. No clear spatial variation in expression patterns was found in the BPNS. This study underlines the potential of field gene expression studies for biomonitoring purposes and the significance of considering seasonal variation in future studies.
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Affiliation(s)
- Ilias Semmouri
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium.
| | - Karel A C De Schamphelaere
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
| | - Filip Van Nieuwerburgh
- Ghent University, Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, 9000, Ghent, Belgium
| | - Dieter Deforce
- Ghent University, Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, 9000, Ghent, Belgium
| | - Colin R Janssen
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium; Blue Growth Research Lab, Ghent University, Bluebridge, Wetenschapspark 1, 8400, Ostend, Belgium
| | - Jana Asselman
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium; Blue Growth Research Lab, Ghent University, Bluebridge, Wetenschapspark 1, 8400, Ostend, Belgium
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10
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Noise and tree species richness modulate the bird community inhabiting small public urban green spaces of a Neotropical city. Urban Ecosyst 2020. [DOI: 10.1007/s11252-020-01021-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Semmouri I, De Schamphelaere KAC, Mees J, Janssen CR, Asselman J. Evaluating the potential of direct RNA nanopore sequencing: Metatranscriptomics highlights possible seasonal differences in a marine pelagic crustacean zooplankton community. MARINE ENVIRONMENTAL RESEARCH 2020; 153:104836. [PMID: 31727392 DOI: 10.1016/j.marenvres.2019.104836] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 10/29/2019] [Accepted: 11/03/2019] [Indexed: 06/10/2023]
Abstract
The implementation of cost-effective monitoring programs for zooplankton remains challenging due to the requirements of taxonomical expertise and the high costs of sampling and species identification. To reduce costs, molecular methods have been proposed as alternatives to morphology-based monitoring. Metatranscriptomics can contribute to promote both cost-effectiveness and accuracy of biological assessments of aquatic ecosystems. Here, we describe and evaluate the construction of a metatranscriptome dataset from a pelagic crustacean zooplankton community. We sampled zooplankton in one marine station, named LW02, in the North Sea, in both winter and summer, and generated transcripts using Oxford Nanopore Technology (ONT), a third-generation nanopore-based sequencing technology. ONT is, uniquely, capable of sequencing RNA directly, rather than depending on reverse transcription and PCR, and applicable to be used directly in the field. We found that metatranscriptomics is capable of species detection, including screening for the presence of endoparasites, hence competing with morphological identification. Taxonomic analysis based on ribosomal 18S transcripts identified calanoid copepods, particularly Temora longicornis and Acartia clausi, as the most abundant community members. Moreover, up to 40.4% and 50.5% of all sequences could be assigned to predicted genes in the winter and summer sample, respectively. The most abundant mRNA transcripts with known function coded for essential metabolic processes. GO term annotation revealed that genes involved in glycolytic and translation-related processes were most expressed in the community. Although small in scale, our study provides the basis for future efforts to characterize the metatranscriptome of marine zooplankton communities and its application in biomonitoring programs.
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Affiliation(s)
- Ilias Semmouri
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium.
| | - Karel A C De Schamphelaere
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
| | - Jan Mees
- Ghent University, Marine Biology Research Group, Faculty of Sciences, 9000, Ghent, Belgium; Flanders Marine Institute VLIZ, InnovOcean Site, Wandelaarkaai 7, 8400, Ostend, Belgium
| | - Colin R Janssen
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
| | - Jana Asselman
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium; Ghent University, Greenbridge, Wetenschapspark 1, 8400, Ostend, Belgium
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12
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Deschutter Y, De Schamphelaere K, Everaert G, Mensens C, De Troch M. Seasonal and spatial fatty acid profiling of the calanoid copepods Temora longicornis and Acartia clausi linked to environmental stressors in the North Sea. MARINE ENVIRONMENTAL RESEARCH 2019; 144:92-101. [PMID: 30638843 DOI: 10.1016/j.marenvres.2018.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 12/24/2018] [Accepted: 12/28/2018] [Indexed: 06/09/2023]
Abstract
The Belgian part of the North Sea (BPNS) is subjected to multiple environmental stressors. The impact of these stressors includes the modulation of fatty acid (FA) composition of the zooplankton. This study recorded temporal and spatial patterns of the FA profiles of two dominant calanoid copepods within the BPNS: Temora longicornis (Müller, 1785) and Acartia clausi (Giesbrecht, 1889). By means of distance-based linear modelling and by applying multi model inference to generalized additive models, environmental stressors were linked to patterns of the FA profiles of these species. The FA profiles of A. clausi and T. longicornis showed distinct intraspecific, spatial and temporal differences within the BPNS. Temperature and algal food quality (marked by the ratio of silicate concentration to dissolved inorganic nitrogen concentration, SiO4/DIN) were the most important drivers of seasonal fluctuations in the DHA/EPA ratio of both species. DHA/EPA ratio can be used as marker for stress in copepods in the BPNS in order to have a quick indication of food quality changes at the basis of the food web.
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Affiliation(s)
- Yana Deschutter
- Ghent University, Marine Biology, Krijgslaan 281-S8, 9000, Ghent, Belgium; Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Coupure Links 653, B-9000, Ghent, Belgium
| | - Karel De Schamphelaere
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Coupure Links 653, B-9000, Ghent, Belgium
| | - Gert Everaert
- Flanders Marine Institute, Wandelaarkaai 7, B-8400, Ostend, Belgium
| | - Christoph Mensens
- Ghent University, Marine Biology, Krijgslaan 281-S8, 9000, Ghent, Belgium
| | - Marleen De Troch
- Ghent University, Marine Biology, Krijgslaan 281-S8, 9000, Ghent, Belgium.
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Semmouri I, Asselman J, Van Nieuwerburgh F, Deforce D, Janssen CR, De Schamphelaere KAC. The transcriptome of the marine calanoid copepod Temora longicornis under heat stress and recovery. MARINE ENVIRONMENTAL RESEARCH 2019; 143:10-23. [PMID: 30415781 DOI: 10.1016/j.marenvres.2018.10.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 10/10/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
Understanding the impacts of global change in zooplankton communities is crucial, as alterations in the zooplankton communities can affect entire marine ecosystems. Despite the economic and ecological importance of the calanoid copepod Temora longicornis in the Belgian part of the North Sea, molecular data is still very limited for this species. Using HiSeq Illumina sequencing, we sequenced the whole transcriptome of T. longicornis, after being exposed to realistic temperatures of 14 and 17 °C. After both an acute (1 day) and a more sustained (5 days) thermal exposure to 17 °C, we investigated gene expression differences with animals exposed to 14 °C, which may be critical for the thermal acclimation and resilience of this copepod species. We also studied the possibility of a short term stress recovery of a heat shock. A total of 179,569 transcripts were yielded, of which 44,985 putative ORF transcripts were identified. These transcripts were subsequently annotated into roughly 22,000 genes based on known sequences using Gene Ontology (GO) and KEGG databases. Temora only showed a mild response to both the temperature and the duration of the exposure. We found that the expression of 27 transcripts varied significantly with an increase in temperature of 3 °C, of which eight transcripts were differentially expressed after acute exposure only. Gene set enrichment analysis revealed that, overall, T. longicornis was more impacted by a sustained thermal exposure, rather than an immediate (acute) exposure, with two times as many enriched GO terms in the sustained treatment. We also identified several general stress responses independent of exposure time, such as modified protein synthesis, energy mobilisation, cuticle and chaperone proteins. Finally, we highlighted candidate genes of a possible recovery from heat exposure, identifying similar terms as those enriched in the heat treatments, i.e. related to for example energy metabolism, cuticle genes and extracellular matrix. The data presented in this study provides the first transcriptome available for T. longicornis which can be used for future genomic studies.
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Affiliation(s)
- Ilias Semmouri
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium.
| | - Jana Asselman
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
| | - Filip Van Nieuwerburgh
- Ghent University, Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, 9000, Ghent, Belgium
| | - Dieter Deforce
- Ghent University, Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, 9000, Ghent, Belgium
| | - Colin R Janssen
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
| | - Karel A C De Schamphelaere
- Ghent University, Laboratory of Environmental Toxicology and Aquatic Ecology, Faculty of Bioscience Engineering, 9000, Ghent, Belgium
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