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Intra-specific variation in skull morphology of juvenile Chelonia mydas in the southwestern Atlantic Ocean

机译：西南大西洋少年象牙Che的头骨形态内种内变异

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摘要

The genetic diversity and skull morphology of juvenile Chelonia mydas recruited to the southwestern Atlantic were evaluated to quantify intraspecific variation in the skull shape and size related to (1) broad geographic origin and (2) age (within the most abundant haplotype). 155 C. mydas stranded at 25(o) S in Brazil were sampled, with 108 assessed for haplotypes (mtDNA) and 102 aged. The hypothesis of no effects of intrinsic variables on the morphology of three skull views was evaluated via 2D geometric morphometrics. Mixed stock analyses identified ten haplotypes among 12 nesting sites, with Ascension Island dominant (65%), then Suriname (10%) and Sao Tome (9%). Compared to CM-A8 (southern Atlantic and west African haplotype) individuals, those assessed as CM-A5 (northern Atlantic and southern Caribbean haplotype) consistently had different skull shapes, which might affect physiology and behaviour. Within CM-A8, there was a positive relationship between centroid size and age (3-5years), and differences in ventral shape, possibly attributed to ontogenetic diet shifts. The clear morphological differences between haplotypes could imply evolutionary consequences for genetic diversity and trophic polymorphism if there is increased future bias towards CM-A8 (owing to fewer anthropogenic impacts during/post hatching). Conserving priority Caribbean nesting grounds during regional management initiatives might protect phenotypic variability and ultimately population diversity and resilience.
机译：评估了招募到西南大西洋的少年象牙白蚁的遗传多样性和头骨形态，以量化与（1）广泛的地理起源和（2）年龄（在最丰富的单倍型内）有关的头骨形状和大小的种内变异。采样了在巴西的25（o）S处困住的155个C. mydas，评估了108个单倍型（mtDNA）和102个年龄。通过二维几何形态计量学评估了内在变量对三个头骨视图形态无影响的假设。混合种群分析确定了12个筑巢点中的10个单倍型，其中扬升岛占主导地位（65％），苏里南（10％）和圣多美（9％）。与CM-A8（南大西洋和西非单倍型）个体相比，被评估为CM-A5（北大西洋和南加勒比单倍型）的个体始终具有不同的头骨形状，这可能会影响生理和行为。在CM-A8中，质心大小和年龄（3-5岁）与腹侧形状之间存在正相关，这可能归因于个体遗传饮食的改变。如果未来对CM-A8的偏见增加（由于孵化后/孵化后人为影响较小），则单倍型之间明显的形态学差异可能暗示遗传多样性和营养多态性的进化后果。在区域管理举措中保留加勒比地区的优先筑巢地可能会保护表型变异，并最终保护人口多样性和适应力。

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  • 来源
    《Marine biology》 |2018年第10期|174.1-174.12|共12页
  • 作者

    Coelho Valeria F.; Domit Camila; Broadhurst Matt K.; Prosdocimi Laura; Nishizawa Hideaki; Almeida Fernanda S.;

  • 作者单位

    PRICTMA, Buenos Aires, DF, Argentina;

    Univ Estadual Londrina, Dept Biol Geral, Lab Genet & Ecol Anim, BR-86057970 Londrina, Parana, Brazil;

    Natl Marine Sci Ctr, New South Wales Dept Primary Ind, Fisheries Conservat Technol Unit, Coffs Harbour, NSW 2450, Australia;

    Univ Fed Parana, Ctr Estudos Mar, Programa Posgrad Sistemas Costeiros & Ocean, BR-83255000 Pontal Do Parana, Parana, Brazil;

    Kyoto Univ, Grad Sch Informat, Dept Social Informat, Kyoto 6068501, Japan;

    Univ Fed Parana, Ctr Estudos Mar, Lab Ecol & Conservacao, BR-83255000 Pontal Do Parana, Parana, Brazil;

    Univ Queensland, Sch Biol Sci, Marine & Estuarine Ecol Unit, Brisbane, Qld 4072, Australia;

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