Species-specific ammonia tolerance in the marine rotifers Brachionus plicatilis and Brachionus rotundiformis: Reproductive characteristics and its mechanisms

Aquaculture ◽  
2021 ◽  
pp. 737837
Author(s):  
Chengyan Han ◽  
Hee-Jin Kim ◽  
Yoshitaka Sakakura ◽  
Atsushi Hagiwara
Keyword(s):  
Brachionus Plicatilis ◽  
Brachionus Rotundiformis ◽  
Reproductive Characteristics ◽  
Species Specific ◽  
Marine Rotifers ◽  
Ammonia Tolerance

scholarly journals The complex evolution of the HSP70 gene family

2020 ◽  
Author(s):  
Er-meng Yu ◽  
Tatsuki Yoshinaga ◽  
Frank L. Jalufka ◽  
Hashimul Ehsan ◽  
David B. Mark Welch ◽  
...  
Keyword(s):  
Heat Shock ◽  
Evolutionary History ◽  
Brachionus Plicatilis ◽  
Phylogenetic Analyses ◽  
Expression Patterns ◽  
Evolutionary Genetics ◽  
Purifying Selection ◽  
Hsp70 Family ◽  
History Of ◽  
Species Specific

AbstractThe 70-kDa heat shock protein (HSP70) family contains several isoforms localized in different subcellular compartments. The cytosolic isoforms have been classified into stress-inducible HSP70s and constitutive heat shock cognates (HSC70s), but occasional reports of “constitutive HSP70s” and the lack of cross-phylum comparisons have been a source of confusion in the evolution of the metazoan HSP70 family. Here we provide novel insights into the evolutionary history of this important molecular chaperone. We first cloned two HSP70 genes from the rotifer Brachionus plicatilis, an emerging model in evolutionary genetics, and confirmed their stress inducibility. Subsequent phylogenetic analyses of 100 full-length HSP70 family member genes revealed an ancient duplication that gave rise to two lineages from which all metazoan cytosolic HSP70s descend. One lineage contains a relatively small number of Lophotrochozoan and Ecdysozoan genes, none of which have been shown to be constitutively expressed. The second included both inducible and constitutive genes from diverse phyla. Species-specific duplications are present in both lineages, and in the second there are well-supported phylum-specific clades for Rotifera, Nematoda, and Chordata. Some genes in this lineage have likely independently acquired stress inducibility, which may explain the sporadic distribution of genes designated as “HSP70” or “HSC70” in previous analyses. Consistent with the history of diversification within each group, stress-inducible members of the second lineage show lower purifying selection pressure compared to constitutive members. These results illustrate the evolutionary history of the HSP70 family independent from their expression patterns, encouraging the development of new nomenclature based on evolutionary history.

Reproductive characteristics of three small-bodied cuttlefish in subtropical waters

2018 ◽  
Vol 69 (3) ◽  
pp. 403
Author(s):  
Amanda L. Beasley ◽  
Karina C. Hall ◽  
Coral I. Latella ◽  
Peter L. Harrison ◽  
Stephen G. Morris ◽  
...  
Keyword(s):  
Seawater Temperature ◽  
Reproductive Mode ◽  
Gonadal Development ◽  
Specific Information ◽  
Potential Fecundity ◽  
Reproductive Characteristics ◽  
Eastern Australia ◽  
Management Plans ◽  
Size At Sexual Maturity ◽  
Species Specific

Life history information for many commercially important cuttlefish is lacking, and thus the effects of long-term harvest remain unknown. The present study investigated the reproductive mode and seasonality of three small-bodied cuttlefish (Sepia opipara, S. plangon and S. rozella) in subtropical eastern Australia. Monthly samples were collected over 2 years and examined for gonadal development, size at sexual maturity, potential fecundity, size of mature oocytes and spermatophores, and temporal variation in maturity stages and gonadal weight relative to seawater temperature. All species showed reproductive characteristics consistent with a terminal multiple spawning mode, with S. opipara and S. rozella likely to be intermittent batch spawners, whereas S. plangon spawned continuously. Spawning occurred year round for all species, but S. opipara and S. rozella showed greater seasonality than S. plangon, peaking in autumn–spring. The biggest species, S. opipara, matured at a larger size than the others, had the greatest potential fecundity (the highest documented for any cuttlefish) and the largest spermatophore sizes. In contrast, S. rozella and S. plangon had much larger mature oocytes than S. opipara. These results further highlight the diversity of reproductive characteristics in cuttlefish, and the need for species-specific information for fishery and conservation management plans.

GABA, 5-HT and amino acids in the rotifers Brachionus plicatilis and Brachionus rotundiformis

2000 ◽  
Vol 127 (3) ◽  
pp. 301-307 ◽  
Author(s):  
Wenresti G Gallardo ◽  
Atsushi Hagiwara ◽  
Kenji Hara ◽  
Kiyoshi Soyano ◽  
Terry W Snell
Keyword(s):  
Amino Acids ◽  
Brachionus Plicatilis ◽  
Brachionus Rotundiformis

Growth, development and behaviour of artificially reared larval Pagrus auratus (Bloch & Schneider, 1801) (Sparidae)

1991 ◽  
Vol 42 (4) ◽  
pp. 391 ◽  
Author(s):  
PM Pankhurst ◽  
JC Montgomery ◽  
NW Pankhurst
Keyword(s):  
Digestive Tract ◽  
Brachionus Plicatilis ◽  
Fish Larvae ◽  
Yolk Sac ◽  
First Feeding ◽  
Pagrus Auratus ◽  
Swimming Mode ◽  
Growth Development ◽  
Marine Rotifers

Pagrus auratus eggs were obtained from wild broodstock with naturally and artificially ovulated fish. Larvae were cultured for periods of up to 1 month on a diet of marine rotifers, Brachionus plicatilis. Small yolk-sac larvae hatched without functional eyes, mouth or digestive tract and for 3 days spent long periods at rest. Growth was initially rapid but slowed by 3 days as yolk reserves were nearing depletion. By Days 4-5, the mouth had opened, eyes were pigmented, yolk was depleted, and a rudimentary gut had formed. Larvae were now able to maintain a horizontal swimming mode and were actively searching for and attacking prey. First-feeding was observed in some larvae. Growth was retarded during the transition from endogenous to exogenous nutrition and then increased, probably as feeding proficiency improved with experience. Larvae starved from hatching did not survive for longer than 8 days.

Sign in / Sign up

Export Citation Format

Share Document