Temperature Compensation in the Escape Response of a Marine Copepod,Calanus finmarchicus(Crustacea)

2005 ◽  
Vol 209 (1) ◽  
pp. 75-85 ◽  
Author(s):  
P. H. Lenz ◽  
A. E. Hower ◽  
D. K. Hartline
Keyword(s):  
Escape Response ◽  
Temperature Compensation ◽  
Calanus Finmarchicus ◽  
Marine Copepod

Validation of an Eulerian population model for the marine copepod Calanus finmarchicus in the Norwegian Sea

2016 ◽  
Vol 160 ◽  
pp. 81-93 ◽  
Author(s):  
Morten Omholt Alver ◽  
Ole Jacob Broch ◽  
Webjørn Melle ◽  
Espen Bagøien ◽  
Dag Slagstad
Keyword(s):  
Population Model ◽  
Calanus Finmarchicus ◽  
Norwegian Sea ◽  
Marine Copepod

scholarly journals Ambient temperature and algal prey type affect essential fatty acid incorporation and trophic upgrading in a herbivorous marine copepod

2020 ◽  
Vol 375 (1804) ◽  
pp. 20200039 ◽  
Author(s):  
Laura Helenius ◽  
Suzanne M. Budge ◽  
Heather Nadeau ◽  
Catherine L. Johnson
Keyword(s):  
Fatty Acids ◽  
Ambient Temperature ◽  
Environmental Variability ◽  
Essential Fatty Acids ◽  
Prey Type ◽  
Growth Efficiency ◽  
Dietary Fatty Acids ◽  
Calanus Finmarchicus ◽  
Marine Copepod ◽  
Gross Growth Efficiency

The essential fatty acids (EFA) eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are critical nutrients for all organisms, and the temperature sensitivity of their trophic transfer in marine systems is of concern because of rising ocean temperatures. Laboratory-reared copepodites of the marine calanoid Calanus finmarchicus were used to test the effects of temperature (at 6°C, 12°C and increasing temperature stress) and prey type (the dinoflagellate Heterocapsa triquetra and the diatom Thalassiosira weissflogii ) on the extent and efficiency of dietary EPA and DHA incorporation from phytoplankton to copepods in a set of feeding experiments using 13 C labelling. Temperature was a significant determinant of C . finmarchicus copepodites' EFA incorporation and gross growth efficiency, defined as the fraction of ingested EFA retained in copepod tissue. Ingestion and incorporation of both EFA were higher at warmer temperature, except in the case of DHA in copepods feeding on diatoms. DHA-associated growth efficiency was higher at the higher temperature for copepodites consuming the dinoflagellate, but temperature-related variation in algal EFA content was also a predictive factor. Moreover, our results strongly suggest that copepodites are capable of synthesizing EPA when consuming an EPA-depleted diet. Our study implies that the copepod link of marine food webs is resilient in terms of EFA transfer when confronted with alterations of ambient temperature and prey type availability. Measurements presented here are critical for estimating how EFA transfer dynamics respond to intra- and interannual environmental variability. This article is part of the theme issue ‘The next horizons for lipids as ‘trophic biomarkers’: evidence and significance of consumer modification of dietary fatty acids’.

scholarly journals Towards population genomics in non-model species with large genomes: a case study of the marine zooplankton Calanus finmarchicus

2019 ◽  
Vol 6 (2) ◽  
pp. 180608 ◽  
Author(s):  
Marvin Choquet ◽  
Irina Smolina ◽  
Anusha K. S. Dhanasiri ◽  
Leocadio Blanco-Bercial ◽  
Martina Kopp ◽  
...  
Keyword(s):  
Population Genomics ◽  
Single Copy ◽  
Calanus Finmarchicus ◽  
Model Species ◽  
Reduced Representation ◽  
Marine Copepod ◽  
Marine Zooplankton ◽  
Sequencing Technologies ◽  
A Genome ◽  
Large Genomes

Advances in next-generation sequencing technologies and the development of genome-reduced representation protocols have opened the way to genome-wide population studies in non-model species. However, species with large genomes remain challenging, hampering the development of genomic resources for a number of taxa including marine arthropods. Here, we developed a genome-reduced representation method for the ecologically important marine copepod Calanus finmarchicus (haploid genome size of 6.34 Gbp). We optimized a capture enrichment-based protocol based on 2656 single-copy genes, yielding a total of 154 087 high-quality SNPs in C. finmarchicus including 62 372 in common among the three locations tested. The set of capture probes was also successfully applied to the congeneric C. glacialis . Preliminary analyses of these markers revealed similar levels of genetic diversity between the two Calanus species, while populations of C. glacialis showed stronger genetic structure compared to C. finmarchicus . Using this powerful set of markers, we did not detect any evidence of hybridization between C. finmarchicus and C. glacialis . Finally, we propose a shortened version of our protocol, offering a promising solution for population genomics studies in non-model species with large genomes.

Importance of Feeding, Direct Uptake from Seawater, and Transfer from Generation to Generation in the Accumulation of an Organochlorine (p,p′-DDT) by the Marine Planktonic Copepod Calanus finmarchicus

1981 ◽  
Vol 38 (1) ◽  
pp. 101-119 ◽  
Author(s):  
Gareth C. Harding ◽  
W. Peter Vass ◽  
Ken F. Drinkwater
Keyword(s):  
Equilibrium Concentration ◽  
Calanus Finmarchicus ◽  
Planktonic Copepod ◽  
Model Simulations ◽  
Marine Copepod ◽  
Planktonic Crustaceans

The accumulation of an organochlorine by the marine copepod Calanus finmarchicus, through feeding on contaminated phytoplankton, 14C-p,p′-DDT labeled Thalassiosira weisflogii, was measured. At "normal" densities, ≈ 60 μg C/L, the copepod retained 60–70% of the DDT ingested following gut egestion, but under "bloom" conditions, ≈ 600 μg C/L, retained as little as 10%. These results enable us to incorporate feeding and generation transfer terms into an earlier model of DDT flux between seawater and planktonic crustaceans. Model simulations indicate that it is not necessary to invoke direct uptake from seawater to arrive at published levels of ΣDDT in copepods, even when our lowest experimental DDT feeding efficiencies are used. We predict that the potential for rapidly developing Calanus to accumulate DDT from generation to generation will reach an equilibrium concentration after 12 generations but that an alternating equilibrium of generations will occur within four generations in a two-season temperature environment.Key words: p,p′-DDT, uptake, clearance, feeding, assimilation, copepods, Calanus finmarchicus

Sex and life stage dependent phototactic response of the marine copepod Calanus finmarchicus (Copepoda: Calanoida)

2014 ◽  
Vol 451 ◽  
pp. 16-24 ◽  
Author(s):  
Cecilie Miljeteig ◽  
Anders Johny Olsen ◽  
Anna S. Båtnes ◽  
Dag Altin ◽  
Trond Nordtug ◽  
...  
Keyword(s):  
Life Stage ◽  
Calanus Finmarchicus ◽  
Marine Copepod ◽  
Phototactic Response

Diapause in the marine copepod,Calanus finmarchicus— A review

Ophelia ◽  
1996 ◽  
Vol 44 (1-3) ◽  
pp. 129-143 ◽  
Author(s):  
Hans-Jürgen Hirche
Keyword(s):  
Calanus Finmarchicus ◽  
Marine Copepod

Expressed sequence tag-derived microsatellites for the cool-water marine copepod Calanus finmarchicus

2007 ◽  
Vol 7 (6) ◽  
pp. 1369-1371 ◽  
Author(s):  
JIM PROVAN ◽  
GEMMA E. BEATTY ◽  
CHRISTINE A. MAGGS ◽  
GRAHAM SAVIDGE
Keyword(s):  
Expressed Sequence Tag ◽  
Calanus Finmarchicus ◽  
Cool Water ◽  
Marine Copepod ◽  
Expressed Sequence

scholarly journals Airgun blasts used in marine seismic surveys have limited effects on mortality, and no sublethal effects on behaviour or gene expression, in the copepod Calanus finmarchicus

2019 ◽  
Vol 76 (7) ◽  
pp. 2033-2044 ◽  
Author(s):  
David M Fields ◽  
Nils Olav Handegard ◽  
John Dalen ◽  
Christiane Eichner ◽  
Ketil Malde ◽  
...  
Keyword(s):  
Escape Response ◽  
Field Experiments ◽  
Sublethal Effects ◽  
Low Frequency ◽  
Calanus Finmarchicus ◽  
Sensory Threshold ◽  
Seismic Surveys ◽  
Commercially Important ◽  
Or Gene ◽  
Marine Seismic

Abstract Seismic surveys use airguns that emit low frequency high magnitude sound to detect subsea resources and to map seabed geology. The effect of seismic blasts on Calanus spp., a key food source for commercially important fish, was assessed in field experiments. Immediate mortality of copepods was significantly different from controls at distances of 5 m or less from the airguns. Mortality 1 week after the airgun blast was significantly higher—by 9% relative to controls—in the copepods placed 10 m from the airgun blast but was not significantly different from the controls at a distance of 20 m from the airgun blast. The increase in mortality—relative to controls—did not exceed 30% at any distance from the airgun blast. Only two genes changed in response to the airgun blast; however, their function is unknown. There were no sublethal effects of the seismic blasts on the escape performance or the sensory threshold needed to initiate an escape response at any of the distances from the airgun blast that were tested. Results from these experiments suggest that seismic blasts have limited effects on the mortality or escape response of Calanus sp. within 10 m of the blast and no measurable impact at greater distances.

scholarly journals Mortality and transcriptional effects of inorganic mercury in the marine copepod Calanus finmarchicus

2017 ◽  
Vol 80 (16-18) ◽  
pp. 845-861 ◽  
Author(s):  
Knut Erik Tollefsen ◽  
You Song ◽  
Tore Høgåsen ◽  
Ida Beathe Øverjordet ◽  
Dag Altin ◽  
...  
Keyword(s):  
Inorganic Mercury ◽  
Calanus Finmarchicus ◽  
Marine Copepod
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