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 Ocean, Barents Sea, Belgian Exclusive Economic Zone, Bulgarian Exclusive Economic Zone, Canada Basin, Cosmopolitan (World Oceans), European waters (ERMS scope), FAO fishing area 18, FAO fishing area 67, Georgian Exclusive Economic Zone, Gulf of Maine, Gulf of Mexico, Gulf of St. Lawrence, New Zealand Exclusive Economic Zone, North East Pacific, North Sea, North West Atlantic, Polish Exclusive Economic Zone, Romanian Exclusive economic Zone, Russian part of the Black Sea, St. Lawrence Estuary, Storfjordrenna, Storfjords, Turkish Exclusive Economic Zone, Ukrainian Exclusive Economic Zone, United Kingdom Exclusive Economic Zone
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Source: World Register of Marine Species

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Arctic to Cape Cod
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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
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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

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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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Oithona similis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 9
Species With Barcodes: 1
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