Just Accepted

Articles just accepted or in press have been peer-reviewed and accepted, which are not yet assigned to volumes/issues, but are citable by Digital Object Identifier (DOI).
The parasitic dinoflagellate Hematodinium infects marine crustaceans
Caiwen Li, Meng Li, Qian Huang
, Available online  , doi: 10.1007/s42995-020-00061-z
Abstract(88) PDF Springerlink
Abstract:
Hematodinium is a type of parasitic dinoflagellate that infects marine crustaceans globally. The parasite lives mainly in the hemolymph or hemocoels of affected hosts, and results in mortalities due to malfunction or loss of functions of major organs. In recent years, the parasite had developed into an emerging epidemic pathogen not only affecting wild populations of economically valuable marine crustaceans in western countries but also the sustainable yield of aquaculture of major crabs in China. The epidemics of the parasitic diseases expanded recently in the coastal waters of China, and caused frequent outbreaks in aquaculture of major crab species, especially Portunus trituberculatus and Scylla paramamosain. In addition, the pathogen infected two species of co-cultured shrimps and multiple cohabitating wild crabs, implying it is a significant threat to the sustainable culture of commercially valuable marine crustaceans. In particular, the polyculture system that is widely used along the coast of China may facilitate the spread and transmission of the pathogen. Thus, to provide a better understanding of the biological and ecological characteristics of the parasitic dinoflagellate and highlight important directions for future research, we have reviewed the current knowledge on the taxonomy, life cycle, pathogenesis, transmission and epidemiology of Hematodinium spp. Moreover, ecological countermeasures have been proposed for the prevention and control of the emerging infectious disease.
RESEARCH PAPER
High abundance and reproductive output of an intertidal limpet (Siphonaria japonica) in environments with high thermal predictability
Jie Wang, Xin Peng, Yun-wei Dong
, Available online  , doi: 10.1007/s42995-020-00059-7
Abstract(140) PDF Springerlink
Abstract:
The predictability of high temperatures is important for intertidal species for coping with thermal stress. To investigate the roles of high temperature and its predictability on the population abundance and reproductive output of an intertidal rocky shore limpet, Siphonaria japonica, we monitored the operative temperature, recorded the population abundance of egg ribbons and adults, and quantiied the expression of heat shock protein 70 (hsp70) mRNA on two warm-temperate rocky shores with diferent thermal environments. Abundances of limpets and egg ribbons in the hotter but more predictable (HP) habitats were higher than those in the relatively benign and unpredictable (BU) habitats. In the HP habitats, there was a strong positive correlation between habitat temperature and population abundance. For limpets living in the HP habitats, the expression of hsp70 exhibited a smaller increase with rising body temperature than for BU limpets, indicating the existence in HP limpets of a preparatory strategy in cellular stress response against thermal stress. Our results demonstrate that the predictability of operative temperature can afect physiological responses and population dynamics. The importance of predictability should be considered in analyses of the ecological consequences of climate warming.
Characterization of TEMPO-oxidized chitin nanofibers with various oxidation times and its application as an enzyme immobilization support
Rui Chen, Wen-Can Huang, Wei Wang, Xiangzhao Mao
, Available online  , doi: 10.1007/s42995-020-00054-y
Abstract(104) PDF Springerlink
Abstract:
Chitin nanofibers have recently received increased attention and are considered to be a promising material for a wide range of applications because of their excellent characteristics. In this study, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized chitin nanofibers (CNFs) with various oxidation times were prepared and characterized. CNFs with different oxidation times were then utilized for enzyme immobilization, using chymotrypsin as a model enzyme. The effects of oxidation time on enzyme immobilization were explored. Results showed characteristics of chitin nanofibers can be controlled by adjusting oxidation time. CNFs treated with TEMPO for 360 min showed the lowest crystallinity (79.13 ± 1.43%), the shortest length (241.70 ± 74.61 nm), the largest width (12.67 ± 3.43 nm), and the highest transmittance (73.01% at 800 nm). The activity of immobilized enzymes and enzyme loading showed good correlation to the carboxylate content of CNFs. The enzyme eiciency based on CNFs and the content of carboxylate groups peaked at the oxidization time of 60 min. When the additional amount of chymotrypsins (CTs) was 500 or 2000 mg/g carrier, the highest loading amount of CTs was 307.17 ± 4.08 or 726.82 ± 12.05 mg/g carrier, respectively.