Sex Steroids Relative to Alternative Mating Behaviors in the Simultaneous Hermaphrodite Serranus subligarius (Perciformes: Serranidae)
Sex Steroids Relative to Alternative Mating Behaviors in the Simultaneous Hermaphrodite Serranus subligarius (Perciformes: Serranidae)
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性类固醇与同时雌雄同体 Serranus subligarius（鲈形目：Serranidae）中替代交配行为的关系
DOI：
10.1006/hbeh.2000.1570
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发表时间：
2000
影响因子：
3.5
通讯作者：
C. Sullivan
中科院分区：
文献类型：
--
作者：
A. Cheek;P. Thomas;C. Sullivan
这项研究是第一次调查的生殖内分泌同时雌雄同体硬骨鱼，带沙鱼（Serranus subligarius）。我们解决两个问题：（1）类固醇激素水平变化在产卵季节或在日常产卵周期的沙鱼？(2)激素水平是否与个体的表型大小、产卵频率和攻击行为以及睾丸在性腺中的比例有关？我们分析了现场人群中循环雌二醇-17 β（E2）、睾酮（T）、11-酮睾酮（11 KT）、17 α，20 β，21-三羟基-4-异戊烯-3-酮（20 β S）和17 α，20 β-二羟基-4-异戊烯-3-酮（DHP）的浓度。只有E2水平在新月和满月时显着较高，这表明在这些时候卵黄发生的高峰期。在25 h的产卵期（12 pm至次日1 pm），每隔2 h采集一次自然产卵的白鲑样本，分析其性腺指数、卵母细胞水化和排卵程度以及血浆E2、T、DHP和20 β S水平。E2和T水平在卵黄发生期没有变化，表明卵母细胞持续募集进入卵黄发生。20 β S水平在最终卵母细胞成熟时达到峰值。由于产卵行为的频率随身体大小而变化，我们在整个产卵季节捕获了各种大小的个体，并分析了激素的循环水平。11 KT和20 β S水平随体尺的增大而显著升高。在1992年，我们量化的频率产卵和攻击行为，循环T和11 KT水平和睾丸质量相对于卵睾丸质量在焦点动物。11 KT水平与求偶行为频率呈正相关，与攻击行为频率和睾丸质量无关。由于激素水平的增加，每个产卵行为的大小和频率的变化，我们建议，性类固醇激素影响个体的产卵策略与生长有关的变化。
This study is the first investigation of reproductive endocrinology in a simultaneously hermaphroditic teleost, the belted sandfish (Serranus subligarius). We address two questions: (1) Do steroid hormone levels vary during the spawning season or during the daily spawning cycle of sandfish? (2) Do hormone levels vary relative to an individual's phenotype-size, frequency of spawning and aggressive behaviors, and proportion of testis in the gonad? We analyzed circulating estradiol-17beta (E2), testosterone (T), 11-ketotestosterone (11KT), 17alpha,20beta,21-trihydroxy-4-pregnen-3-one (20betaS), and 17alpha,20beta-dihydroxy-4-pregnen-3-one (DHP) concentrations in a field population. Only E2 levels were significantly higher at the new and full moon, suggesting peak periods of vitellogenesis at these times. Naturally spawning sandfish were sampled every 2 h during the photophase of a 25-h period (12 pm to 1 pm the following day) and gonadosomatic index, degree of oocyte hydration and ovulation, and plasma levels of E2, T, DHP, and 20betaS were analyzed. E2 and T levels did not vary during photophase, suggesting continuous recruitment of oocytes into vitellogenesis. The 20betaS levels peaked around the time of final oocyte maturation. Since frequency of spawning behaviors changes with body size, we captured individuals of various sizes throughout the spawning season and analyzed circulating levels of hormones. 11KT and 20betaS levels increased significantly with body size. In 1992, we quantified frequency of spawning and aggressive behaviors, circulating T and 11KT levels and testicular mass relative to ovotestis mass in focal animals. 11KT levels tended to be positively correlated with frequency of courting male behavior, but were unrelated to the frequency of aggressive behavior or testis mass. Because hormone levels increased with size and frequency of each spawning behavior changes with size, we propose that sex steroids influence growth-related changes in spawning tactics of individuals.
类固醇在体外诱导大西洋黄花鱼卵母细胞生发囊泡破裂中的构效关系。
影响因子：
2.7
作者：
Trant,JM;Thomas,P
通讯作者：
Thomas,P
斑点鳟鱼（Cynoscion nebulosus）肝脏雌激素受体的结合特征。
影响因子：
2.7
作者：
Smith,JS;Thomas,P
通讯作者：
Thomas,P