RELATIVE GROWTH PATTERN OF WALKING LEGS OF THE JAPANESE MITTEN CRAB ERIOCHEIR JAPONICA
RELATIVE GROWTH PATTERN OF WALKING LEGS OF THE JAPANESE MITTEN CRAB ERIOCHEIR JAPONICA
复制标题
日本绒螯蟹行走足的相对生长规律
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发表时间：
2002
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通讯作者：
Satoshi Kobayashi
中科院分区：
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作者：
Satoshi Kobayashi
摘要我量化了日本福冈县西乡河日本绒螯蟹（de哈安）步行腿的相对生长。通过绘制第三步行腿merus长度（LML）对甲壳宽度（CW），我可以区分四个生长阶段的性别，然后我拟合的异速生长的回归线（Log Y = a Log X + B）的每个阶段。在第一阶段（不分性别，CW < 4 mm），生长呈异速生长，腿的相对长度增加（a = 1.37）。在第二阶段（4 mm ≤ CW < 20 mm），生长几乎是等长的，腿保持相对较长（雄性a = 1.05，雌性a = 1.04）。在第三阶段（20 mm ≤ CW < 40 mm，雄性; 20 mm ≤ CW < 37 mm，雌性），生长呈负异速生长，相对腿长下降（a = 0.82，雄性; 0.70，雌性）。在第四阶段（雄蟹CW ≥ 40 mm，雌蟹CW ≥ 37 mm）（包括成蟹），生长呈负异速生长，腿相对变短，雄蟹的相对生长比雌蟹的负生长更大（a = 0.82，雄蟹和雌蟹分别为0.92）。这些模式反映了E.日本的。第一阶段发生后，解决和变态（1-3龄），然后开始上游迁移，并准备迁移。第二阶段与上游迁移和扩散阶段相吻合。相对较长的腿增加运动活动对流动和帮助螃蟹分散到广泛的地区沿着。第三个阶段是活跃洄游后的生长阶段，直到螃蟹达到成熟。第四个阶段是成熟期，在此期间，参与生殖的成年人出现，性二型变得明显。在第四阶段雄性中存在形态变化（较小雄性中腿相对较长，较大雄性中腿相对较短）。并对交配策略变异的可能性进行了讨论。
Abstract I quantified relative growth of the walking legs of the Japanese mitten crab Eriocheir japonica (de Haan) in the Saigo River, Fukuoka Prefecture, Japan. By plotting the third walking leg merus length (LML) against carapace width (CW), I could distinguish four growth phases for both sexes; I then fitted a regression line of allometry (Log Y = a Log X + b) to each phase. In the first phase (not sexed, CW < 4 mm), growth was positively allometric, and relative length of legs increased (a = 1.37). In the second phase (4 mm ≤ CW < 20 mm), growth was nearly isometric, and legs remained relatively longer (a = 1.05 for males and 1.04 for females). In the third phase (20 mm ≤ CW < 40 mm for male, and 20 mm ≤ CW < 37 mm for female), growth was negatively allometric, and relative leg length decreased (a = 0.82 for males and 0.70 for females). In the fourth phase (CW ≥ 40 mm for males and CW ≥ 37 mm for females) including adult crabs, growth was negatively allometric, and the legs become relatively shorter; for males, relative growth was more negative than for females (a = 0.82 for males and 0.92 for females). These patterns reflect the migratory habit in the life cycle of E. japonica. The first phase occurred just after settlement and metamorphosis (instars 1–3) before starting upstream migration and was preparatory for the migration. The second phase coincided with the period of upstream migration and dispersal. Relatively longer legs increase locomotor activity against the flow and help crab dispersion to the wide area along the river. The third phase is the growth phase after active migration until crabs attain maturity. The fourth phase is the maturity phase, during which adults participating in reproduction emerge and sexual dimorphism becomes evident. There was a morphological variation in fourth phase males (relatively long legs in smaller males and relatively short legs in larger males). The possibility of variation of mating strategy is discussed.