scholarly journals Toxic effects of PCB126 and TCDD on shortnose sturgeon and Atlantic sturgeon

2012 ◽  
Vol 31 (10) ◽  
pp. 2324-2337 ◽  
Author(s):  
R. Christopher Chambers ◽  
Dawn D. Davis ◽  
Ehren A. Habeck ◽  
Nirmal K. Roy ◽  
Isaac Wirgin
Keyword(s):  
Toxic Effects ◽  
Shortnose Sturgeon ◽  
Atlantic Sturgeon

Sperm-cell ultrastructure of North American sturgeons. II. The shortnose sturgeon (Acipenser brevirostrum, Lesueur, 1818)

1999 ◽  
Vol 77 (2) ◽  
pp. 321-330 ◽  
Author(s):  
Martin N DiLauro ◽  
Wayne S Kaboord ◽  
Rosemary A Walsh
Keyword(s):  
Sperm Cell ◽  
Cell Ultrastructure ◽  
Sperm Cells ◽  
Shortnose Sturgeon ◽  
Atlantic Sturgeon ◽  
Head Region ◽  
Acipenser Brevirostrum ◽  
Transmission Electron ◽  
Structural Connection ◽  
Single Flagellum

The fine structure of the sperm cell of the shortnose sturgeon (Acipenser brevirostrum) was examined using transmission electron microscopy and selected metrics. The cell possesses a distinct acrosome, a defined head region, a midpiece, and a single flagellum. The mean length of the sperm cell body (acrosome + nucleus + midpiece) is approximately 9.71 µm, and the length of the flagellum is about 37 µm, resulting in a total cell length of about 46 µm. The sperm cell of the shortnose sturgeon is much longer and slightly wider than that of the Atlantic sturgeon. The nuclei of shortnose, white, and stellate sturgeon sperm cells are elongate trapezoids with the anterior (acrosome) end narrowest, the opposite of that of the Atlantic sturgeon. Although slightly smaller in total length and width than the sperm cells of the stellate and white sturgeons, that of the shortnose sturgeon is most similar to them in overall ultrastructure, as all three cells have three endonuclear canals. A structural connection of unknown function between the nuclear fossa and the proximal centriole, which is similar to the fibrous body in other species, is present in the shortnose sturgeon sperm cell. Our results suggest a more recent evolutionary link between the shortnose, white, and stellate sturgeons than between any of these and the Atlantic sturgeon. This is the first description of sperm cell ultrastructure in the shortnose sturgeon, an endangered species.

scholarly journals Characterization of AHR1 and its functional activity in Atlantic sturgeon and shortnose sturgeon

2018 ◽  
Vol 205 ◽  
pp. 25-35 ◽  
Author(s):  
Nirmal K. Roy ◽  
Melissa DellaTorre ◽  
Allison Candelmo ◽  
R. Christopher Chambers ◽  
Ehren Habeck ◽  
...  
Keyword(s):  
Functional Activity ◽  
Shortnose Sturgeon ◽  
Atlantic Sturgeon

Sperm-cell ultrastructure of North American sturgeons. III. The lake sturgeon (Acipenser fulvescens Rafinesque, 1817)

2000 ◽  
Vol 78 (3) ◽  
pp. 438-447 ◽  
Author(s):  
Martin N DiLauro ◽  
Wayne S Kaboord ◽  
Rosemary A Walsh
Keyword(s):  
Sperm Cell ◽  
Radial Symmetry ◽  
Lake Sturgeon ◽  
Acipenser Fulvescens ◽  
Sperm Cells ◽  
Shortnose Sturgeon ◽  
Atlantic Sturgeon ◽  
Cell Nuclei ◽  
Head Region ◽  
Anterior Portion

Lake sturgeon (Acipenser fulvescens) sperm cell fine structure was examined using transmission electron microscopy. The cell possesses a distinct acrosome, a defined head region, a midpiece, and a single flagellum. Sperm cells of this species share a general radial symmetry, an elongate shape, a distinct acrosome, and the presence of endonuclear canals with those of other sturgeons. The mean length of the lake sturgeon sperm cell body (acrosome + nucleus + midpiece) is approximately 7.13 µm and the length of the flagellum is about 50 µm, resulting in a total cell length of about 57 µm. The lake sturgeon sperm cell is much longer and slightly wider than that of the Atlantic sturgeon. The sperm-cell nuclei of lake, shortnose, white, and stellate sturgeons are elongate trapezoids in shape, with the anterior (acrosome) end narrowest but, in the Atlantic sturgeon, the anterior portion of the trapezoid is wider than the posterior. Although slightly smaller in total length and width, the lake sturgeon sperm cell is most similar to the shortnose sperm cell in ultrastructure, overall size, and shape; it also shares similarity of shape with the stellate and white sturgeon sperm cells. The cell nuclei of these four sturgeons have three endonuclear canals. The acrosome of the lake sturgeon sperm cell has longer posterolateral projections than that of the Atlantic or shortnose sturgeon sperm cell. A structural connection, the fibrous body, is present in the lake sturgeon sperm cell between the nuclear fossa and the proximal centriole, as in the Atlantic and shortnose sturgeon sperm cells. Our results suggest a more recent evolutionary linkage between the lake and shortnose sturgeons than with the Atlantic sturgeon. This work presents the first ultrastructural description of the lake sturgeon sperm cell.

Sign in / Sign up

Export Citation Format

Share Document