| new locality records for third-stage larvae of anisakis simplex (sensu lato) (nematoda: ascaridoidea) in euphausiids euphausia pacifica and thysanoessa raschii from prince william sound, alaska. | five euphausiid species (n=41,037) were collected in october 1997 from prince william sound, alaska, and examined for parasites. new locality records are claimed for third-stage larvae (l3) of whaleworm anisakis simplex (sensu lato) in two (0.019%) of 10,437 thysanoessa raschii, and in one (0.013%) of 7,443 euphausia pacifica. the l3 were about 19.5, 21.3 and 30.5 mm long. l3 were absent from 8,026 t. inermis, 10,302 t. longipes and 4,829 t. spinifera collected at the same time, and from 6,648 e ... | 2005 | 16175395 |
| gymnodinioides pacifica, n. sp., an exuviotrophic ciliated protozoan (ciliophora, apostomatida) from euphausiids of the northeastern pacific. | a new species of apostome ciliate, gymnodinioides pacifica n. sp. from the euphausiid euphausia pacifica is described. the ciliated protozoan encysts on the setae of the appendages, telson and antennae. it excysts and enters the exoskeleton of the host after moulting, where it feeds on exuvial fluid. the phoront and trophont stages of this ciliate are described. the ciliature of the trophont has the following characteristics that distinguish it from the other species of gymnodinioides: (1) a sho ... | 2006 | 17070755 |
| the hydrodynamic disturbances of two species of krill: implications for aggregation structure. | krill aggregations vary in size, krill density and uniformity depending on the species of krill. these aggregations may be structured to allow individuals to sense the hydrodynamic cues of neighboring krill or to avoid the flow fields of neighboring krill, which may increase drag forces on an individual krill. to determine the strength and location of the flow disturbance generated by krill, we used infrared particle image velocimetry measurements to analyze the flow field of free-swimming solit ... | 2011 | 21562171 |
| ciliate species diversity and host-parasitoid codiversification in pseudocollinia infecting krill, with description of pseudocollinia similis sp. nov. | all parasitoid apostome ciliates infecting krill in the northeastern pacific are currently assigned to the genus pseudocollinia. each krill specimen is apparently infected by only 1 pseudocollinia species. we describe pseudocollinia similis sp. nov., discovered infecting the krill thysanoessa spinifera off oregon, usa. its protomite-tomite stage resembles that of p. beringensis, which infects t. inermis (type host species), t. longipes, and t. raschii females in the bering sea. these ciliates ha ... | 2014 | 25449320 |
| discovery of a ciliate parasitoid of euphausiids off oregon, usa: collinia oregonensis n. sp. (apostomatida: colliniidae). | an apostome ciliate, collinia oregonensis n. sp., is reported inhabiting the cephalothorax and abdomen of 3 euphausiid species from the oregon-washington coast: euphausia pacifica hansen, 1911, thysanoessa spinifera holmes, 1900, and thysanoessa gregaria g.o. sars, 1883. this ciliate is the 7th species described for the genus collinia and the 2nd species known to infect euphausiids. disease progression and ciliate morphology are described using (1) modified protargol stain, (2) hematoxylin count ... | 2006 | 16921999 |
| spatial distribution and temporal patterns of cassin's auklet foraging and their euphausiid prey in a variable ocean environment. | krill (euphausiids) play a vital ecosystem role in many of the world's most productive marine regions, providing an important trophic linkage. we introduce a robust modeling approach to link cassin's auklet (ptychoramphus aleuticus) abundance and distribution to large-scale and local oceanic and atmospheric conditions and relate these patterns to similarly modeled distributions of an important prey resource, krill. we carried out at-sea strip transect bird surveys and hydroacoustic assessments o ... | 2015 | 26629818 |