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首页> 外文期刊>Marine ecology progress series >Adaptive radiation at a low taxonomic level: -divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii
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Adaptive radiation at a low taxonomic level: -divergence in buoyancy of the ecologically similar Antarctic fish Notothenia coriiceps and N. rossii

机译：在低生物分类水平的适应性辐射：-生态相似的南极鱼类诺登氏菌和罗氏猪笼草的浮力发散

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ABSTRACT: We studied the buoyancy of 263 specimens of the sympatric sister species Notothenia coriiceps and N. rossii captured at King George Island. In these species without a swim bladder, we expressed measurements of buoyancy as percentage buoyancy (%B = weight in water/weight in air × 100), with smaller numbers reflecting more buoyant (i.e. less dense) species. Mean %B of N. coriiceps (4.34%) was significantly greater than that of N. rossii (3.82%), reflecting the lower density and more active swimming, migratory, and feeding behavior of N. rossii compared to N. coriiceps. Skeletal weight as a percentage of body weight was also significantly greater in N. coriiceps (2.46%) than N. rossii (1.65%). Paradoxically, the weight of the vertebral column as a percentage of skeletal weight was significantly greater in N. rossii (28.01%) than in N. coriiceps (24.29%); however, this is intelligible in light of the bone anatomy and histology. Our sample encompassed a wide size and age range, and trend lines for scatter plots of %B against standard length were curvilinear for both species, peaking at 140 to 160 mm, a phenomenon not previously seen in studies of notothenioid buoyancy. We conclude that the ontogenetic increase in %B (reduced buoyancy) in fingerlings/young juveniles and the ontogenetic decrease in %B (increased buoyancy) in older juveniles/immature adults reflects disproportionate growth of skeletal and visceral tissues, respectively, and is not causally related to concurrent pelagic–demersal habitat shifts.
机译：摘要：我们研究了263个同伴姐妹种 Notothenia coriiceps 和 N的浮力。 rossii 在乔治王岛被捕。在这些没有游泳膀胱的物种中，我们将浮力的测量值表示为浮力百分比（％B =水的重量/空气的重量×100），其中较小的数字表示更多的浮力（即密度较小） 。 N的平均值 B 。 Coriiceps （4.34％）显着高于 N。 rossii （3.82％），反映了 N的较低密度和更活跃的游泳，迁徙和进食行为。 rossii 与 N相比。 Coriiceps 。骨骼重量占体重的百分比也显着增加。皮疹（2.46％）比 N。 rossii （1.65％）。矛盾的是，在骨骼中，椎骨的重量占骨骼重量的百分比明显更高。 rossii （28.01％）比 N。肱二头肌（24.29％）;但是，从骨骼解剖学和组织学的角度来看，这是可以理解的。我们的样本涵盖了广泛的大小和年龄范围，％B B 相对于标准长度的散点图的趋势线在两个物种中均呈曲线，峰值为140至160 mm，这是以前在研究中未发现的现象。类胡萝卜素的浮力。我们得出的结论是，鱼种/年轻幼虫的％ B 的个体发育增加（浮力降低）和年龄较大/未成年成年人的％ B 的个体发育降低（浮力增加）反映了骨骼和内脏组织的生长分别不成比例，并且与并发的上层-深海生境迁移没有因果关系。

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