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Updated: Feb 12, 2026

Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

Published on: April 17, 2018

CASA in invertebrates.

Gerhard van der Horst¹, Monique Bennett¹, John D D Bishop²

¹Department of Medical Biosciences, University of the Western Cape, Robert Sobukwe Road, Bellville, 7535, South Africa.

Reproduction, Fertility, and Development

|April 10, 2018

Summary

This summary is machine-generated.

This study quantifies invertebrate sperm motility using computer-aided sperm analysis (CASA-Mot) for the first time in several species. Researchers observed helical sperm tracks and induced hyperactivation, providing insights into reproductive strategies.

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Area of Science:

Marine Biology
Reproductive Biology
Invertebrate Zoology

Background:

Sperm motility is crucial for invertebrate reproduction but poorly quantified in many species.
Computer-aided sperm analysis (CASA-Mot) has been limited to a few externally fertilizing invertebrates.
Understanding sperm behavior is key to deciphering diverse reproductive strategies like broadcast spawning and spermcasting.

Purpose of the Study:

To quantify sperm motility and track characteristics in five invertebrate species using CASA-Mot.
To investigate the induction of sperm hyperactivation using egg water and chemical modulators.
To correlate sperm behavior patterns with invertebrate reproductive strategies.

Main Methods:

Utilized computer-aided sperm analysis (CASA-Mot) to analyze sperm tracks and kinematics.
Quantified motility parameters in the oyster Crassostrea gigas and four other species.
Studied sperm behavior over time and in response to egg water, caffeine, and procaine hydrochloride.

Main Results:

Identified species-specific helical sperm tracks across all studied invertebrates.
Demonstrated the induction of sperm hyperactivation in all species using egg water and/or caffeine.
Characterized hyperactivated sperm tracks using CASA-Mot for the first time.

Conclusions:

CASA-Mot is a valuable tool for detailed analysis of invertebrate sperm motility.
Sperm hyperactivation can be induced in diverse invertebrate species, suggesting conserved mechanisms.
Sperm motility patterns provide insights into the evolution of invertebrate reproductive strategies.