Mass Mortality of Krill Caused by Parasitoid Ciliates

  title={Mass Mortality of Krill Caused by Parasitoid Ciliates},
  author={Jaime G{\'o}mez‐Guti{\'e}rrez and William T Peterson and Alex De Robertis and Richard D. Brodeur},
  pages={339 - 339}
Euphausiids, commonly known as krill, often dominate pelagic crustacean productivity of the world’s oceans. The ecology of these crustaceans has been extensively studied, but sources of mortality remain poorly understood. Predation and starvation are traditionally assumed to be the most important causes of death; however, little attention has been given to the identification of other sources of natural mortality (1). Here we report on a ciliate parasite with significant infection rates in… 

Parasites and Diseases

The apparently low parasite diversity of E. superba is likely associated with its Antarctic zoogeographic pattern; where, parasites have not invaded the Antarctic krill with the same evolutionary success as have occurred with other euphausiid species from tropical, subtropical, temperate, and even Arctic ecosystems.

Krill-Parasite Interactions

All the available, worldwide reports of epibionts and parasites of species of the Order Euphausiacea published between 1885 and 2015 are reviewed, providing a relatively broad and coherent perspective about interespecific interactions inferred in the bases of diversity, prevalence patterns, intensity, parasite–host size ratios, and availability of microhabitats.

Parasites in Antarctic krill guts inferred from DNA sequences

A recent study of krill diet using DNA analysis of gut contents provided a snapshot of the parasites present within 170 E. superba guts in a small area along the West Antarctic Peninsula, suggesting parasites may play a more important role than previously acknowledged in E.superba ecology and population dynamics.

Parasite–copepod interactions in Svalbard: diversity, host specificity, and seasonal patterns

The diverse assemblage of parasites observed in these copepod genera, and the frequency of infection, suggest parasites may be playing a greater role in Arctic plankton communities than generally acknowledged.

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,

Vampyrophrya pelagica (Chatton and Lwoff 1930), an apostome ciliate infectious on calanoid copepod from the Northeastern Arabian Sea

Background Zooplankton provides a dynamic habitat to various kinds of epibionts in the marine ecosystem and also forms a source of food and nutrients to various parasites and parasitoids. The study

Histophagous ciliate Pseudocollinia brintoni and bacterial assemblage interaction with krill Nyctiphanes simplex. II. Host responses.

The ineffective response of the krill antioxidant defense system against histophagous ciliates and the bacteria associated with the ciliate suggests that Pseudocollinia ciliATES are functionally analogous to krill predators and may have a strong influence on the population dynamics of krill.

Symbiosis Of Planktonic Copepods And Mysids With Epibionts And Parasites In The North Pacific: Diversity And Interactions

This chapter reviews various aspects of the biology of Argulus spp.

Histopathology of Antarctic krill, Euphausia superba, bearing black spots.

Unusual Mortality of Krill (Crustacea: Euphausiacea) in Bahía de La Paz, Gulf of California1

A hypothetical scenario describing the sea-surface aggregations and beach strandings of N. difficilis is presented and it is suggested that upwelling conditions occurred and the diatom bloom was in its final phase.



High apostome ciliate endoparasite infection rates found in the Bering Sea euphausiid Thysanoessa inermis.

Results of this work indicate extreme infection rates in the 2 samples studied of Thysanoessa inermis infected by Collinia beringensis, suggesting that these ciliates may be important modifiers of euphausiid production.

Krill: biology, ecology and fisheries

Krill, or euphausiids, a group of immense importance in marine ecosystems, comprises over 80 species, most of which are planktonic and have led to commercially successful krill harvesting.

Supported by the U.S. GLOBEC Program (contribution 385) and NOAA's Ocean Exploration Program

  • Supported by the U.S. GLOBEC Program (contribution 385) and NOAA's Ocean Exploration Program

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