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The ultrastructure of resurrection: Post-diapause development in an Antarctic freshwater copepod

Cited 2 time in wos
Cited 3 time in scopus
The ultrastructure of resurrection: Post-diapause development in an Antarctic freshwater copepod
Other Titles
남극 호수에 서식하는 요각류 알의 부화 과정 중 초미세구조 관찰연구
Reed, Katherine A.
Lee, Sung Gu
Lee, Jun Hyuck
Park, Hyun
Covi, Joseph A.
Biochemistry & Molecular BiologyBiophysicsCell Biology
CrustaceanDevelopmental biologyDiapauseElectron microscopyPartial syncytiumZooplankton
Issue Date
Reed, Katherine A., et al. 2021. "The ultrastructure of resurrection: Post-diapause development in an Antarctic freshwater copepod". JOURNAL OF STRUCTURAL BIOLOGY, 213(1): 1-11.
The copepod, Boeckella poppei, is broadly distributed in Antarctic and subantarctic maritime lakes threatened by climate change and anthropogenic chemicals. Unfortunately, comparatively little is known about freshwater zooplankton in lakes influenced by the Southern Ocean. In order to predict the impact of climate change and chemicals on freshwater species like B. poppei, it is necessary to understand the nature of their most resilient life stages. Embryos of B. poppei survive up to two centuries in a resilient dormant state, but no published studies evaluate the encapsulating wall that protects theses embryos or their development after dormancy. This study fills that knowledge gap by using microscopy to examine development and the encapsulating wall in B. poppei embryos from Antarctica. The encapsulating wall of B. poppei is comprised of three layers that appear to be conserved among crustacean zooplankton, but emergence and hatching are uniquely delayed until the nauplius is fully formed in this species. Diapause embryos in Antarctic sediments appear to be in a partially syncytial mid-gastrula stage. The number of nuclei quadruples between the end of diapause and hatching. Approximately 75% of yolk platelets are completely consumed during the same time period. However, some yolk platelets are left completely intact at the time of hatching. Preservation of complete yolk platelets suggests an all-or-none biochemical process for activating yolk consumption that is inactivated during dormancy to preserve yolk for post-dormancy development. The implications of these and additional ultrastructural features are discussed in the context of anthropogenic influence and the natural environment.
King Sejong Station
Appears in Collections  
2020-2020, Post-Polar Genomics Project: Functional genomic study for securing of polar useful genes (20-20) / Kim, Jin-Hyoung (PE20040)
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