Life history, aspects of reproductive biology and production of Corophium orientale (Crustacea: Amphipoda) in Monolimni lagoon (Evros Delta, North Aegean Sea)
Life history, aspects of reproductive biology and production of Corophium orientale (Crustacea: Amphipoda) in Monolimni lagoon (Evros Delta, North Aegean Sea)
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莫诺利姆尼泻湖（北爱琴海埃夫罗斯三角洲）东方蠹蛾（甲壳纲：片足纲）的生活史、生殖生物学和生产
DOI：
10.1007/s10750-004-1713-5
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发表时间：
2005
期刊：
影响因子：
2.6
通讯作者：
T. Kevrekidis
中科院分区：
文献类型：
--
作者：
T. Kevrekidis
Monthly samples of Corophium orientale were collected during February 1998–February 1999 in both parts of Monolimni lagoon (0.3 < Sal. < 6 psu, 2 < Temp. < 28.5 °C). Corophium orientaleshowed a semiannual life cycle. In the southern part, breeding occurred from early spring to mid autumn having three peaks, in early spring, early summer and early autumn, and three cohorts were produced, a spring cohort, a summer cohort and an overwintering one. In the shallower innermost northern part of Monolimni lagoon, breeding peaked in mid-spring and, also, in early autumn, and two discrete cohorts, a spring and an overwintering one, were produced. A lack of large individuals, attributed to a temporary size – selective predation by migrating shorebirds, was observed during summer. That lack possibly contributed to the hiatus in reproduction. Photoperiod seemed to be a more important cue than temperature in the initiation of the reproductive cycle, while extremely low salinities (<1 psu) did not deter breeding. Females attained maturity at a smaller size in late spring and, especially, in summer than in early spring at lower temperatures. Brood size was a function of females’ body size. Females, matured during summer at high temperatures, showed the lowest brood size, body length ratio. Mean brood size was small (12–13 early embryos) and embryo loss during development high (54%), possibly due to a negative effect of low salinities. A 1:1 sex ratio existed in the small body length classes, but females preponderated in the large ones. The spring cohort in the southern part, which developed at moderate temperatures, showed the highest growth rate (40 μm day−1). Secondary production of C. orientalecalculated by Hynes’s method gave a mean annual density of 4562.5 and 9327.6 ind. m−2, a mean annual crop (B) of 1.03 and 2.67 g DW m−2, an annual production (P) of 6.91 and 22.54 g DW m−2 and a P/B ratio of 6.7 and 8.4 in the northern and southern part of the lagoon, respectively.
