Overview

Comprehensive Description

Biology

The most abundance surface-dwelling copepod of Arctic
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Body almost completely transparent, red tinting may be present on female urosome (the tail); Lipid sac can be prominent; Urosome (tail) long (40-50% of prosome); Antennae longer then prosome, but less than total length
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Distribution

Arctic to Cape Cod
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Cosmopolite, but cold Atlantic waters are preferable locations

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Physical Description

Morphology

Female:
Rostrum is directed down, is only visible from lateral view. Caudal setae are never longer than the abdomen. Eggs inside egg-sac are usually placed in 1 row. Md endopodite with a small seta and 3 setae subequal in length. 2nd endopodal segment of Mx1 present and armed with 1 seta; 1st lobe represented by 1 seta

Male:
Rostrum is absent. Both A1 are geniculate. The caudal setae are significantly shorter than in female.

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Size

Female: 0,68-1,20 mm
Male: 0,50-0,82 mm

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Diagnostic Description

Can be distinguished from O. atlantica by smaller size, structure of the rostrum and significantly shorter caudal setae.

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Ecology

Habitat

upper and glacial epipelagic regions of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Depth range based on 8807 specimens in 1 taxon.
Water temperature and chemistry ranges based on 3847 samples.

Environmental ranges
  Depth range (m): 0 - 1090
  Temperature range (°C): -1.899 - 25.900
  Nitrate (umol/L): 0.000 - 31.104
  Salinity (PPS): 16.708 - 38.518
  Oxygen (ml/l): 0.130 - 9.323
  Phosphate (umol/l): 0.048 - 2.616
  Silicate (umol/l): 0.965 - 136.705

Graphical representation

Depth range (m): 0 - 1090

Temperature range (°C): -1.899 - 25.900

Nitrate (umol/L): 0.000 - 31.104

Salinity (PPS): 16.708 - 38.518

Oxygen (ml/l): 0.130 - 9.323

Phosphate (umol/l): 0.048 - 2.616

Silicate (umol/l): 0.965 - 136.705
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Boreal to arctic waters; Bipolar; Abundant on shelves, as well as over deep basins
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Trophic Strategy

Microcarnivore feeding on motile phytoplankton and protists, plus copepod nauplii
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General Ecology

Ecology

Oceanic, epi- to bathypelagic species

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Life History and Behavior

Life Cycle

Females spawn year-round, less in winter; Female carries eggs in 2 elongate clutches until hatching; Clutch size dependent on size of female, with maximums of ~30 and typically ~15-25 eggs; Generation length unclear, suggested as 1 year for Arctic and multiple generations per year in the sub-arctic; Life expectancy uncertain
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Oithona similis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 10
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Barcode data: Oithona similis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 3 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

TCCTGTAATCATAAAGATATTGGAACTCTATATCTTTTAACTGGAGTTTGGGCAGGAATAATTGGAACTAGGATA---AGTGTTATTATCCGAATTCAACTTTCGTACCCTACTGGTTTTTTGTGTAAT---GAGCAGCTTTATAATGTAATGGTTACAGCCCATGCTTTTATTATAATTTTTTTTATAGTAATACCGATCTTAATCGGTTGTTTTGGAAATTGGCTAGTTCCTTTAATA---ATTGGATCTCCAGATATAGCTTTTCCCCGACTCAACAATATGAGCTATTGACTATTAGTCCCTGCTTTGTTCTTACTATTAGTAGGCTCTATAGTAGAATCTGGAGCTGGTACAGGTTGGACAGTGTATCCCCCTCTTAGGTCATACATTTTTCATGGAGGCGCTTCTGTGGATTTT---ACAATTTTCAGGCTGCATTTAGCAGGAGTTTCTTCTCTCCTAGGCGCCGTGAACTTTATTAGAACAGTATTAAATCTTCGTGCATTAGGCATGCTAATAGACCGGATACCTTTATTCCCTTGAGCTGTGTTTATTACAGCTATTCTTTTACTGCTATCACTTCCCGTGTTAGCTGGG---GCAATTACGATATTGCTAACAGACCGAAATTTAAACACATCATTTTACGATCCTATAGGGGGAGGGCATCCTGTCTTGTACCAACACTTATTTTGATTTTTTGGGCACCCTGAAGTGTATATTTTAATCCTTCCGGGGTTTGGCCTGATCTCTCACATTGTTAGGCAAGAGAGGGGTAAAAAT---GAACCTTTTGGTGCACTGGGTATAATTTATGCAATAAGTGCTATTGGTGTTTTAGGTTTTGTAGTGTGAGCCCACCATATATTTACAGTTGGGATA---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------GAA
-- end --

Download FASTA File
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