Annual cycle of energy allocation to growth and reproduction of yellow perch
Annual cycle of energy allocation to growth and reproduction of yellow perch
复制标题
黄鲈生长繁殖能量分配的年周期
DOI：
10.1111/j.1095-8649.2000.tb00780.x
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发表时间：
2000
影响因子：
2
通讯作者：
N. Collins
中科院分区：
文献类型：
--
作者：
B. Henderson;T. Trivedi;N. Collins
伊利湖西部和中西部的黄花鲈的生长(长度、重量)从6-7月开始，可能在初冬时达到渐近大小。体细胞组织的能量密度(kJ g−1)在6~9月间显著增加，次年春季降至较低水平。因此，体细胞组织的能量质量(KJ)在9月份增加，然后缓慢下降，直到3月份。卵巢从10月份开始生长，卵巢的大小在4月份达到最大，就在5月份产卵之前。然而，卵巢的能量密度在12月达到峰值，然后下降。因此，冬季卵巢大小的增加很大程度上是由于低能量密度组织的分配。繁殖力和性腺大小与体能密度和性腺能量密度相关。一个生物能量学模型被用来描述每月分配给呼吸、生长、排泄和生殖的能量。大多数直接生殖成本(80%)发生在9月至12月，与肝脏活动的周期相对应。在初夏获得的能量可能是决定成熟度、繁殖力和鸡蛋质量的关键。从1978年到1990年，伊利湖西部和中西部盆地80%的女性被归类为7月份度过的。
Growth (length, weight) of yellow perch Perca flavescens in western and west-central Lake Erie began between June and July, possibly reaching asymptotic size by early winter. Energy density (kJ g−1) of somatic tissue increased markedly from June to September, then declined to low levels by the following spring. Consequently, energy mass (kJ) of somatic tissue increased to September and then declined slowly until March. Ovarian growth began in October, and the size of the ovaries was maximal in April, just before spawning in May. The energy density of ovaries, however, increased to a peak in December, and then declined. The increase in ovary size in the winter, therefore, resulted largely from an allocation of tissue of low energy density. Fecundity and gonad size were correlated with somatic and gonadal energy density. A bioenergetics model was used to describe the monthly allocations of energy to respiration, growth, excretion, and reproduction. Most direct reproductive costs (80%) were incurred from September to December, corresponding to the cycle in the activity of the liver. Energy acquired in the early summer may be critical for determining maturation, fecundity, and egg quality. From 1978 to 1990, <80% of the females from the western and west-central basins of Lake Erie were classed as spent in July.