EFFECTS OF POPULATION-DENSITY ON FECUNDITY AND FERTILITY IN THE GUPPY, POECILIA-RETICULATA (PETERS)
EFFECTS OF POPULATION-DENSITY ON FECUNDITY AND FERTILITY IN THE GUPPY, POECILIA-RETICULATA (PETERS)
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DOI：
10.1111/j.1095-8649.1979.tb03573.x
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发表时间：
1979-01-01
影响因子：
2
通讯作者：
DAHLGREN, BT
中科院分区：
文献类型：
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作者：
DAHLGREN, BT
通过实验研究了种群密度对孔雀鱼繁殖力和生育力的影响。仅具有卵子或具有不同生殖单位和卵巢发育阶段组合的雌性的频率在不同密度之间存在显着差异，但在相同种群密度的 1 次和 2 次妊娠的雌性之间没有显着差异。最低密度中妊娠 1 次的雌性卵巢宽度显着大于最高密度中的雌性。 2个妊娠期雌性的性腺长度、高度和卵巢体积，密度最低的比密度最高的要大。妊娠1次后，与密度较高的雌性相比，最低群体水平的雌性具有更大的卵巢长度、高度、性腺重量、宽度和体积。最低密度的两个妊娠期雌性的卵巢长度、高度和体积以及性腺重量也显着大于第二低密度的雌性。平均性腺体比率在人口密度最低时最高。在每个群体水平的女性性腺体积和总体重之间以及性腺体积和卵巢重量之间发现显着相关性。当在每个人口密度中检查卵巢重量与总体重时，情况也是如此。仅在最低种群水平上，生育力与体长之间以及生育力与体长之间才存在显着相关性。在同一群体水平上，性腺体积和身体总长度之间以及性腺重量和身体长度之间也发现了显着的关系。相同密度的1、2妊娠期雌性之间的产卵量和卵子大小没有显着差异。 1 和 2 妊娠期的雌性从最低密度开始的繁殖力和生育力显着高于从最高密度开始的雌性。
Experiments were performed to examine the influence of population density on the fecundity and fertility in the guppy P. reticulata. The frequency of females with only ova or with different combinations of reproductive units and developmental stages in the ovary was significantly different between different densities but not between females with 1 and 2 gestations from the same population density. The ovarian width of females with 1 gestation from the lowest density was significantly larger than in the highest population density. Gonad length and height and ovarian volume of females with 2 gestation periods were larger in the lowest compared with the highest density. After 1 gestation, females at the lowest population level had greater ovarian length, height, gonad weight, width and volume compared with those from the higher density. Ovarian length, height and volume and gonad weight were also significantly greater among females of 2 gestation periods in the lowest than in the 2nd lowest density. The average gonadosomatic ratio was highest in the lowest population density. A significant correlation was found between gonad volume and total body weight and between gonad volume and ovarian weight of females at every population level. This was also the case when ovarian weight vs. total body weight was examined in each population density. Only at the lowest population level was there a significant correlation between fecundity and total body length and between fertility and body length. A significant relationship was also found between gonad volume and total body length and between gonad weight and body length at the same population level. No significant difference of fecundity and ovum size was found between females of 1 and 2 gestation periods from the same density. Fecundity and fertility were significantly higher among females of 1 and 2 gestation periods from the lowest than from the highest density.