[MARMAM] New publication: Number of Primordial Follicles in Juvenile Ringed Seals (Pusa hispida) from the Gulf of Bothnia and West Greenland (Britta Schmidt)

Britta Müller brimue92 at gmail.com
Tue Apr 12 00:21:17 PDT 2022

Dear colleagues,

On behalf of my co-authors, I am happy to announce the publication of our
newest paper in Animals:

"Number of Primordial Follicles in Juvenile Ringed Seals (Pusa hispida)
from the Gulf of Bothnia and West Greenland"

Full view access to the article can be found here:

Primordial follicles are important for the reproduction cycle and,
therefore, also for the survival of the whole population of a species.
Mammals have a large pool of primordial follicles, and it is thought that
this pool represents the total number of oocytes. The aim of the present
study was to determine the total primordial follicle number of juvenile
ringed seals (Pusa hispida) from the Gulf of Bothnia and Greenland.
Overall, 52 ovaries from two ringed seal populations (West Greenland (N =
6), Gulf of Bothnia, region in the Baltic Sea (N = 46)) were examined. All
ovaries were cut into 2 mm thick slices and every slice was embedded in
paraffin. Out of each tissue block, a 5 m thick section was cut and stained
with haematoxylin-eosin. The mean volume of the follicles and the total
volume of primordial follicles per ovary were estimated by stereology and
used to calculate the total estimated number of primordial follicles. The
median of the total estimated number of primordial follicles seemed to be
higher in Baltic individuals than in Greenland individuals (Gulf of Bothnia
= 565,657; Greenland Sea = 122,475). This widens the total range of
primordial follicles in ringed seals overall and might bear some potential
for discussions regarding the influence of endocrine disruptors and
environmental influences depending on different regions/populations and
their exposure to various factors. Thus, this study aims to provide basic
reference data of the number and mean volume of ringed seal primordial

Feel free to contact me with any questions.

Best wishes,

Britta Schmidt, Dr. rer. nat.
University of Veterinary Medicine Hannover, Foundation
Institute for Terrestrial and Aquatic Wildlife Research (ITAW)
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