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| Thyasanopoda Aequalis | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Euphausiacea |
| Family: | Euphausiidae |
| Genus: | Thysanopoda |
| Species: | T. aequalis
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| Binomial name | |
| Thysanopoda aequalis Hansen, 1905
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| Synonyms [1] | |
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Thysanopoda aequalis is a species of krill found in subtropical and tropical Atlantic, Mediterranean, central and western Pacific and Southern Indian Ocean[2]. It is a planktonic crustacean between the size of 12-19 mm. T. aequalis feeds on phytoplankton and marine detritus and is one of the most abundant zooplankton species in the Sargasso Sea [3]. In the Mediterranean Sea, they are one of the most abundant species of euphausiid with Euphausia hemigibba [4]. They are also a major food source for various planktivorous fish. They can be distinguished by their rounded and equally inflated frontal plate wand a lappet with an upper surface extending forward, covering the full width of segment 2. The male's thoracic leg 3 has distal 3 segments modified[5][6]. Taxonomically, they are closely related to Thysanopoda astylata and Thysanopoda obtusifrons [7].
Ocean Carbon Cycle
[edit]In the biological pump, T. aequalis's vertical migration contributes to the active transport of both dissolved inorganic carbon (DIC) by respiration and dissolved organic carbon (DOC) by feeding near the surface and produce sinking fecal pellets below the mixed layer at the Bermuda Atlantic Time-series Study (BATS) site [3]. The source of carbon they export to the deeper depths will help transfer the atmospheric carbon to the deep sea where carbon is sequestered and stored for
Behavior
[edit]
T.aequalis has a well-developed filtering basket made by their thoracic legs to filter feed on phytoplankton. Depending on the quantity and the quality of the phytoplankton availability, they can switch to a carnivorous feeding mode [8]. They live in the open ocean and perform a diel vertical migration between 300 - 600 m [9].
Reference
[edit]- ^ Volker Siegel (2022). Jacob van der Land (ed.). "Thysanopoda aequalis Hansen, 1905". World Euphausiacea database. World Register of Marine Species. Retrieved Sep 8, 2022.
- ^ "WoRMS - World Register of Marine Species - Thysanopoda aequalis Hansen, 1905". www.marinespecies.org. Retrieved 2022-09-09.
- ^ a b Steinberg, Deborah K.; Carlson, Craig A.; Bates, Nicholas R.; Goldthwait, Sarah A.; Madin, Laurence P.; Michaels, Anthony F. (2000-01). "Zooplankton vertical migration and the active transport of dissolved organic and inorganic carbon in the Sargasso Sea". Deep Sea Research Part I: Oceanographic Research Papers. 47 (1): 137–158. doi:10.1016/s0967-0637(99)00052-7. ISSN 0967-0637.
{{cite journal}}: Check date values in:|date=(help) - ^ Wiebe, P. H.; D'Abramo, L. (1972-07). "Distribution of euphausiid assemblages in the Mediterranean Sea". Marine Biology. 15 (2): 139–149. doi:10.1007/bf00353642. ISSN 0025-3162.
{{cite journal}}: Check date values in:|date=(help) - ^ "Marine Species Identification Portal : Thysanopoda aequalis". species-identification.org. Retrieved 2022-09-09.
- ^ BODEN, BRIAN P.; BRINTON, EDWARD (1957-10). "The Euphausiid Crustaceans Thysanopoda aequalis Hansen and Thysanopoda subaequalis Boden, Their Taxonomy and Distribution in the Pacific1". Limnology and Oceanography. 2 (4): 337–341. doi:10.1002/lno.1957.2.4.0337. ISSN 0024-3590.
{{cite journal}}: Check date values in:|date=(help); line feed character in|title=at position 55 (help) - ^ Vereshchaka, Alexander L.; Kulagin, Dmitry N.; Lunina, Anastasia A. (2018-05-10). "A phylogenetic study of krill (Crustacea: Euphausiacea) reveals new taxa and co-evolution of morphological characters". Cladistics. 35 (2): 150–172. doi:10.1111/cla.12239. ISSN 0748-3007.
- ^ Schnetzer, A.; Steinberg, D. (2002-07-01). "Natural diets of vertically migrating zooplankton in the Sargasso Sea". Marine Biology. 141 (1): 89–99. doi:10.1007/s00227-002-0815-8. ISSN 1432-1793.
- ^ Hu, Vernon J. H. (1978-03). "Relationships between vertical migration and diet in four species of euphausiids 1: Vertical migration and diet". Limnology and Oceanography. 23 (2): 296–306. doi:10.4319/lo.1978.23.2.0296.
{{cite journal}}: Check date values in:|date=(help)