Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean
The present study examined temporal changes in plasma sex hormone concentrations and the morphology and histology of reproductive organs in mature northwest Atlantic (NWA) bonnetheads Sphyrna tiburo L. to characterize reproductive cycle, breeding periodicity and fertility in this still poorly studie...
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ftunivnflorida:oai:digitalcommons.unf.edu:unf_faculty_publications-1490 2023-05-15T17:45:35+02:00 Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean Gonzalez De Acevedo, Melissa Frazier, Bryan S. Belcher, Carolyn Gelsleichter, James 2020-12-01T08:00:00Z https://digitalcommons.unf.edu/unf_faculty_publications/491 https://doi.org/10.1111/jfb.14537 unknown UNF Digital Commons https://digitalcommons.unf.edu/unf_faculty_publications/491 https://doi.org/10.1111/jfb.14537 UNF Faculty Publications bonnethead fecundity shark reproduction sperm storage Sphyrna tiburo text 2020 ftunivnflorida https://doi.org/10.1111/jfb.14537 2022-12-09T08:08:52Z The present study examined temporal changes in plasma sex hormone concentrations and the morphology and histology of reproductive organs in mature northwest Atlantic (NWA) bonnetheads Sphyrna tiburo L. to characterize reproductive cycle, breeding periodicity and fertility in this still poorly studied population. Progressive increases in testis width, epididymis head width, plasma testosterone (T) concentrations, and occurrence of mature spermatozoa were observed in male S. tiburo from June to September, demonstrating that spermatogenesis occurs during the summer. Nonetheless, increases in maximum follicle diameter, oviducal gland width, plasma 17β-estradiol and T concentrations, and occurrence of vitellogenic follicles were not observed in mature females until between October and April, demonstrating non-synchronous patterns of gametogenesis in males and females. Fresh copulatory wounds were observed in females collected during late September along with histological evidence for sperm presence in the oviducal gland between September and April, confirming a 6- to 7 month period of female sperm storage. Ovulation occurred between mid-April and early May in concert with increases in female plasma progesterone concentrations. Gestation occurred during a 4.5- to 5 month period between May and early September, and 97% of mature females collected during this period were gravid, indicating a highly synchronized, annual reproductive periodicity. Brood size was significantly correlated with maternal size and ranged from 1 to 13 pups with a mean ± S.D. of 8.1 ± 2.2, which was significantly lower than reported in Gulf of Mexico (GOM) populations. The occurrence of non-fertile offspring was observed in 17% of broods with a range of 1–7 non-fertile eggs present in individual females. Thus, as previously reported in GOM S. tiburo, this unusual form of infertility also appears to be prevalent in the NWA population and requires further study. This study has demonstrated meaningful differences in reproductive biology of these ... Text Northwest Atlantic University of North Florida (UNF): Digital Commons Journal of Fish Biology 97 6 1733 1747 |
institution |
Open Polar |
collection |
University of North Florida (UNF): Digital Commons |
op_collection_id |
ftunivnflorida |
language |
unknown |
topic |
bonnethead fecundity shark reproduction sperm storage Sphyrna tiburo |
spellingShingle |
bonnethead fecundity shark reproduction sperm storage Sphyrna tiburo Gonzalez De Acevedo, Melissa Frazier, Bryan S. Belcher, Carolyn Gelsleichter, James Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
topic_facet |
bonnethead fecundity shark reproduction sperm storage Sphyrna tiburo |
description |
The present study examined temporal changes in plasma sex hormone concentrations and the morphology and histology of reproductive organs in mature northwest Atlantic (NWA) bonnetheads Sphyrna tiburo L. to characterize reproductive cycle, breeding periodicity and fertility in this still poorly studied population. Progressive increases in testis width, epididymis head width, plasma testosterone (T) concentrations, and occurrence of mature spermatozoa were observed in male S. tiburo from June to September, demonstrating that spermatogenesis occurs during the summer. Nonetheless, increases in maximum follicle diameter, oviducal gland width, plasma 17β-estradiol and T concentrations, and occurrence of vitellogenic follicles were not observed in mature females until between October and April, demonstrating non-synchronous patterns of gametogenesis in males and females. Fresh copulatory wounds were observed in females collected during late September along with histological evidence for sperm presence in the oviducal gland between September and April, confirming a 6- to 7 month period of female sperm storage. Ovulation occurred between mid-April and early May in concert with increases in female plasma progesterone concentrations. Gestation occurred during a 4.5- to 5 month period between May and early September, and 97% of mature females collected during this period were gravid, indicating a highly synchronized, annual reproductive periodicity. Brood size was significantly correlated with maternal size and ranged from 1 to 13 pups with a mean ± S.D. of 8.1 ± 2.2, which was significantly lower than reported in Gulf of Mexico (GOM) populations. The occurrence of non-fertile offspring was observed in 17% of broods with a range of 1–7 non-fertile eggs present in individual females. Thus, as previously reported in GOM S. tiburo, this unusual form of infertility also appears to be prevalent in the NWA population and requires further study. This study has demonstrated meaningful differences in reproductive biology of these ... |
format |
Text |
author |
Gonzalez De Acevedo, Melissa Frazier, Bryan S. Belcher, Carolyn Gelsleichter, James |
author_facet |
Gonzalez De Acevedo, Melissa Frazier, Bryan S. Belcher, Carolyn Gelsleichter, James |
author_sort |
Gonzalez De Acevedo, Melissa |
title |
Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
title_short |
Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
title_full |
Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
title_fullStr |
Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
title_full_unstemmed |
Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean |
title_sort |
reproductive cycle and fecundity of the bonnethead sphyrna tiburo l. from the northwest atlantic ocean |
publisher |
UNF Digital Commons |
publishDate |
2020 |
url |
https://digitalcommons.unf.edu/unf_faculty_publications/491 https://doi.org/10.1111/jfb.14537 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
UNF Faculty Publications |
op_relation |
https://digitalcommons.unf.edu/unf_faculty_publications/491 https://doi.org/10.1111/jfb.14537 |
op_doi |
https://doi.org/10.1111/jfb.14537 |
container_title |
Journal of Fish Biology |
container_volume |
97 |
container_issue |
6 |
container_start_page |
1733 |
op_container_end_page |
1747 |
_version_ |
1766148718701051904 |