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Sperm Transport

Sperm Transport

The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...

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Author Spotlight: Developing Efficient Cryopreservation and Biobanking Technologies for Global Reef Restoration

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Assessing coral sperm motility.

Nikolas Zuchowicz^1,2,3, Jonathan Daly^4,5,6, Jessica Bouwmeester^4,5

¹Center for Species Survival, Smithsonian Conservation Biology Institute, Smithsonian Institution, Front Royal, VA, USA. nzucho1@lsu.edu.

Scientific Reports

|January 9, 2021

Summary

This summary is machine-generated.

Computer-assisted sperm analysis (CASA) provides effective methods for assessing coral sperm viability. New quality control procedures improve accuracy, aiding climate change adaptation research for reef populations.

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Area of Science:

Marine Biology
Reproductive Biology
Ecology

Background:

Coral reproductive viability is declining, impacting adaptation to climate change.
Quantitative and comparative monitoring of coral reproductive health is crucial.
Computer-assisted sperm analysis (CASA) is widely used for animal sperm but not yet for corals.

Purpose of the Study:

To establish effective quality control procedures and CASA settings for coral sperm analysis.
To address disparities between CASA measurements and manual evaluations.
To provide a benchmark for comparative studies on coral reproductive characteristics.

Main Methods:

Developed and validated CASA settings and quality control protocols for coral sperm.
Investigated the effects of slide adhesion and sperm dilution on motility.
Tested additives like bovine serum albumin and caffeine to reduce adhesion.
Compared CASA concentration counts with haemocytometer and flow cytometry measures.
Assessed motile sperm per egg as a predictor of fertilization success.

Main Results:

Additives (bovine serum albumin, caffeine) reduced sperm adhesion and improved motility and motile sperm concentration without affecting total sperm concentration.
Sperm dilution negatively impacted motility, particularly in heat-stressed corals.
CASA concentration counts were comparable to haemocytometer and flow cytometer measures.
Motile sperm per egg successfully predicted fertilization success with cryopreserved sperm.

Conclusions:

The study provides validated CASA procedures for reliable coral sperm analysis.
Effective quality control measures are essential for accurate CASA assessments in corals.
This work establishes a foundation for comparative studies on coral reproductive viability and climate change impacts.