Intraspecific variation in the sexual pattern of red-belted anthias, Pseudanthias rubrizonatus
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View abstract on PubMed
Summary
This summary is machine-generated.Red-belted anthias exhibit varied sexual patterns based on population size, with larger groups showing diandric protogyny. This study reveals intraspecific variation in sexual strategy for Pseudanthias rubrizonatus.
Area Of Science
- Marine Biology
- Ichthyology
- Reproductive Biology
Background
- Sexual patterns in some species vary with population size and density.
- Protogynous species may shift to gonochorism in larger populations.
- Red-belted anthias (Pseudanthias rubrizonatus) are protogynous hermaphrodites forming diverse-sized groups.
Purpose Of The Study
- To determine the sexual pattern of Pseudanthias rubrizonatus in different-sized groups.
- To investigate intraspecific variation in sexual patterns based on population density.
- To explore the reproductive strategies of P. rubrizonatus in Kagoshima Bay.
Main Methods
- Conducted research from July 2019 to June 2022.
- Utilized gonadal histology and otolith growth analysis to identify sexual patterns.
- Collected and analyzed fish from diverse group sizes in Kagoshima Bay.
Main Results
- All juvenile gonads developed ovarian lumens before sexual differentiation.
- Most individuals differentiated into mature females, then changed sex to secondary males.
- Primary males were found only in large groups (>10,000 individuals), indicating diandric protogyny.
- Medium-sized groups exhibited monandric protogyny.
- Sex change occurred year-round, with no evidence of gonochorism.
Conclusions
- Pseudanthias rubrizonatus displays intraspecific variation in sexual patterns, with diandric protogyny in large groups and monandric protogyny in medium groups.
- Diandric protogyny in Anthiinae is unprecedented.
- Protogyny is consistently maintained in P. rubrizonatus, regardless of group size.
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