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7 results for “euphausiid”
Larval euphausiids collected using a 1 x 1 m square frame net with 333-μm mesh aboard Palmer LTER annual cruises off the coast of the Western Antarctic Peninsula, 1993-2013
Euphausiids (krill) are abundant along the Western Antarctic Peninsula where they have important impacts on the marine ecosystem and biogeochemical cycling. Euphausiids develop through a series of morphologically distinct larval stages within the first year of their life cycle. The calyptopis stages are followed by the furcilia stages before individuals recruit to the post-larval population. Larvae collected during Janury were most likely spawned during the preceding weeks or months of Antarctic spring/summer. Euphausia superba and Thysanoessa macrura are the most abundant euphausiid species along the Western Antarctic Peninsula. Euphausia crystallorophias, Euphausia frigida, and Euphausia triacantha are present but less abundant in the region. Samples were collected with a 1 x 1 m square frame net with 333-μm mesh towed obliquely to a depth of typically 300 m. Density of total calyptopis and furcilia larvae (all species combined) was determined for a subset of samples collected on the annual Palmer LTER cruises to cover the latitudinal and cross-shelf gradients of the study region. Larval euphausiid abundance varies spatially as spawning output is not homogeneous across the region. Larval euphausiid abundance also varies year-to-year due to changes in population demographics and environmental conditions.
California Current Ecosystem Euphausiid data, Brinton and Townsend Euphausiid Database (BTEDB)
These euphausiid data are generated from samples taken by the CalCOFI (California Cooperative Oceanic Fisheries Investigations) program, starting with the 1951 cruises. Data are obtained by enumeration of samples by trained microscopists with a high level of taxonomic expertise, beginning with the late Edward Brinton, including Annie Townsend’s assistance starting in the 1970’s, and then by Linsey Sala from 2011 to present. Only a limited subset of the CalCOFI samples have been enumerated taxonomically, primarily from springtime cruises. Since 2004, taxonomic analysis has been carried out as part of the CCE-LTER (California Current Ecosystem Long-Term Ecological Research) program, supported by the U.S. National Science Foundation. The primary geographic area analyzed is the Southern California region (CalCOFI lines 77 to 93, inclusive), supplemented by more limited springtime cruises from the Central California region (lines 60 to 73). Samples are all double oblique samples taken with a bongo net beginning in Dec. 1977 or a ring net prior to that time, nominally from 210-0 m, bottom depth permitting.
Figure 1 in Parasitic isopods (Crustacea: Dajidae) of euphausiids (Crustacea: Euphausiacea) in the western Caribbean Sea
Figure 1. Areas and zooplankton stations grids in the western Caribbean from which the examined samples were obtained. (a) NOAA oceanographic cruise GG1101. (b) oceanographic cruise GG1001. (c) Zooplankton survey of the northwestern Caribbean. (d) Zooplankton survey of Chinchorro Bank.
Figure 3 in Parasitic isopods (Crustacea: Dajidae) of euphausiids (Crustacea: Euphausiacea) in the western Caribbean Sea
Figure 3. Oculophryxus bicaulis, (a) free ovigerous female with dwarf male (arrow), showing its modified curved antennules to grasp the host eye peduncle; (b) ovigerous female with male, attached to Stylocheiron affine eye peduncles; (c) Branchiophryxus koehleri, adult female, detail of anterior part of body, with four pairs of pereopods; (d) B. koehleri, ovigerous female, ventro-lateral view; (e) B. koehleri, female attached to branchial pinnules of S. longicorne.
Figure 2 in Parasitic isopods (Crustacea: Dajidae) of euphausiids (Crustacea: Euphausiacea) in the western Caribbean Sea
Figure 2. Heterophryxus appendiculatus, (a) female with epicaridium larvae; (b) same, detail of epicaridium larvae; (c) ovigerous female attached to cephalothorax of Thysanopoda aequalis; (d) juvenile individual, lateral view; (e) female of Oculophryxus bicaulis attached to Stylocheiron affine.
Assembled file of spring annual averages of abundance of selected euphausiids from the Southern California region, 1951 - 2011.
Derived dataset of spring annual averages of abundance of sentinel euphausiid species (Euphausia pacifica, Nyctiphanes simplex and Nematoscelis difficilis) since 1951 (ongoing). Zooplankton are collected in net tows and enumerated by major taxa from spring CalCOFI cruises (lines 80-93, inclusive of stations from shore out to station 70). Original data are from the zooplankton dataspace, specifically the Brinton-Townsend Euphausiid Database.
Data from: Mobulid rays feed on euphausiids in the Bohol Sea
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