Effects of age on sperm quality metrics in endangered Mississippi gopher frogs (Lithobates sevosus) from captive populations used for controlled propagation and reintroduction efforts.
anuran
captive breeding
fertilization success
induction
motility
Journal
Zoo biology
ISSN: 1098-2361
Titre abrégé: Zoo Biol
Pays: United States
ID NLM: 8807837
Informations de publication
Date de publication:
May 2021
May 2021
Historique:
received:
13
11
2020
accepted:
08
02
2021
pubmed:
20
2
2021
medline:
2
6
2021
entrez:
19
2
2021
Statut:
ppublish
Résumé
A decline in sperm quality with age is a common prediction of senescence-based hypotheses and empirical studies. While widely studied across taxa, there is little known on the effect of ageing on sperm quality in amphibians, especially in captive populations used for controlled propagation and reintroduction efforts. Here, we investigated variation in sperm quality metrics (i.e., motility, concentration, and morphology) in the endangered Mississippi gopher frog (Lithobates sevosus) among males of three age categories using individuals from captive breeding populations housed at three different zoological institutions. Different aged males across the species expectant lifespan (1-9, 1-2, 3-4, and 8-9-year-old subcategories) were chosen in an attempt to identify an optimal breeding age relevant for captive breeding programs. Moreover, we explored and statistically controlled for potential differences in sperm quality which may be attributed to the type of induction hormones and source populations that differed among institutions. Results indicated that males of different ages did not differ in sperm motility or concentration. However, we did find that older males (8-9 years old) had significantly longer sperm than other age categories and younger males (1-2 years old) had significantly more atypical sperm than other age categories. Furthermore, we found no significant differences in any sperm quality metrics between the different induction hormones or source populations used at the different institutions. Within a captive breeding program, this information is especially valuable as our results indicate that males that have only recently sexually matured may not be ready to breed, while older males maintain sperm quality metrics presumably related to fertilization success.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
218-226Subventions
Organisme : Natural Sciences and Engineering Research Council of Canada
Informations de copyright
© 2021 Wiley Periodicals LLC.
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