Calanoides acutus

Calanoides acutus is a copepod found in Antarctica and the surrounding waters.

Calanoides acutus
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Maxillopoda
Subclass:
Copepoda
Order:
Calanoida
Family:
Calanidae
Genus:
Calanoides
Species:
C. acutus
Binomial name
Calanoides acutus
(Giesbrecht, 1902)

Description

The female ranges from about 3.5 to 5.7 millimetres (0.14 to 0.22 in), and the male has an average length of about 4.6 millimetres (0.18 in).[1]

Distribution

C. acutus is found in Antarctic and sub-Antarctic waters, from sea level to 1,000 metres (3,300 ft) in depth.[1]

Ecology

Life history and reproduction

While C. acutus is only confirmed to breed from November to March,[2] it likely starts breeding in early October, as a study observed females without eggs and late-stage nauplii presumably belonging to this copepod in mid-November.[3] Stage I through III copepodites are generally found from sea level to 100 metres (330 ft) of depth. Older stages, on the other hand, are found in the top 200 metres (660 ft) during the summer, except during December, when they are found in the top 100 metres (330 ft).[4] C. acutus starts to descend in February, although this is affected by the food supply, with individuals in the northern portion of the range, like in Drake Passage, only starting to winter during mid-March.[5] Individuals, mainly stage IV and V copepodites,[4] winter to between about 500 and 1,000 metres (1,600 and 3,300 ft).[5] There is no evidence of diel vertical migration in this species.[3]

References
  1. Razouls C.; de Bovée F.; Kouwenberg J.; Desreumaux N. (2018). "Calanoides acutus (Giesbrecht, 1902)". Diversity and Geographic Distribution of Marine Planktonic Copepods. Sorbonne Université, CNRS. Retrieved 8 July 2018.
  2. Hagen, Wilhelm; Schnack-Schiel, Sigrid B. (1996). "Seasonal lipid dynamics in dominant Antarctic copepods: Energy for overwintering or reproduction?". Deep Sea Research Part I: Oceanographic Research Papers. 43 (2): 139–158. doi:10.1016/0967-0637(96)00001-5.
  3. Lopez, MDG; Huntley, ME; Lovette, JT (1993). "Calanoides acutus in Gerlache Strait, Antarctica. I. Distribution of late copepodite stages and reproduction during spring". Marine Ecology Progress Series. 100: 153–165. doi:10.3354/meps100153.
  4. Huntley, Mark; Escritor, Florence (1991). "Dynamics of Calanoides acutus (Copepoda: Calanoida) in Antarctic coastal waters". Deep Sea Research Part A. Oceanographic Research Papers. 38 (8–9): 1145–1167. doi:10.1016/0198-0149(91)90100-T.
  5. Schnack-Schiel, SB; Hagen, W; Mizdalski, E (1991). "Seasonal comparison of Calanoides acutus and Calanus propinquus (Copepoda: Calanoida) in the southeastern Weddell Sea, Antarctica". Marine Ecology Progress Series. 70: 17–27. doi:10.3354/meps070017.
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