

FOLLOWUS
1.College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai201306, China
2.Center for Polar Research, Shanghai Ocean University, Shanghai201306, China
3.Polar Marine Ecosystem Group, the Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai201306, China
4.National Engineering Research Center for Oceanic Fisheries, Shanghai201306, China
gpzhu@shou.edu.cn
Received:28 December 2022,
Online First:08 January 2024,
Published:01 September 2024
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XIONG Yi,ZHAO Sijie,ZHU Guoping.Summer gregarine infection in Antarctic krill Euphausia superba in the Dumont D’Urville Sea, East Antarctic[J].Journal of Oceanology and Limnology,2024,42(05):1651-1658.
XIONG Yi,ZHAO Sijie,ZHU Guoping.Summer gregarine infection in Antarctic krill Euphausia superba in the Dumont D’Urville Sea, East Antarctic[J].Journal of Oceanology and Limnology,2024,42(05):1651-1658. DOI: 10.1007/s00343-024-2402-z.
Antarctic krill
Euphausia superba
plays a key role in the Antarctic food web. The trophic linkage between krill and other macro-organisms has been studied in the past decades
but the variability of parasites in krill is less studied and remains poorly understood. Therefore
it is important to understand the factors that influence abundance and infection of parasites in krill. Moreover
the relationship between the infection intensity of parasite and krill diet needs to be clarified
which is helpful for understanding the role of parasite in the food web. We investigated the abundance of the highly prevalent gregarine parasites in the digestive tract of krill and the factors influencing the gregarine infection to krill in the East Antarctic. The infection rate of
Cephaloidophora pacifica
Avdeev
1985 to krill (
n
=50 individuals) was 94%. The results of generalized linear model show the infection intensity of
C
.
pacifica
to the host was related significantly to the station
krill size
and maturity stage
but not the food species and abundance in the stomach of krill. Abundance of
C
.
pacifica
in krill differed among stations
and the lowest abundance occurred in the station nearest to the coast. Gregarines abundance varied among sexual maturity stages of krill and increased with krill size.
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