Ontogeny of the skull of Sotalia guianensis (Cetartiodactyla: Delphinidae) on the Northern coast of Brazil

IF 0.5 4区生物学 Q4 ZOOLOGY Iheringia Serie Zoologia Pub Date : 2020-01-01 DOI:10.1590/1678-4766e2020024

Renata F. Novais, S. Siciliano, Renata Emin‐Lima, J. S. Silva Júnior

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引用次数: 1

Abstract

ABSTRACT This study aimed to investigate the ontogenetic development of the skull in the Guiana dolphin (Sotalia guianensis Van Bénéden, 1864 ) through the comparison of 29 morphological non-metrical characters together with the estimated age of 54 specimens derived from four areas on the northern coast of Brazil. The state of each character was associated with the age of each specimen to assess the formation of bone structures, and the degree of fusion of the sutures in each state of the character studied. Nineteen qualitative morphological characters presenting state ontogenetic variations have been analyzed statistically. The analysis depicted that the characters associated with the parietal-frontal suture, parietosupraoccipital, parietoexoccipital, supraoccipital-exoccipital and basioccipital-pterygoid varied according with the age. The results suggest that the physical maturity of the cranium was more premature in the specimens from the Northern Coast, suggesting a geographical adjustment of the species, or a biological response to an intense pressure of by-catch in fisheries over decades on the populations.

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巴西北部海岸的贵人索塔利亚(鲸足目:海豚科)头骨的个体发育

摘要本研究旨在通过比较来自巴西北部海岸四个地区的54个标本的29个形态学非定格特征和估计年龄，来研究圭亚那海豚(Sotalia guianensis Van bb (1864))颅骨的个体发育。每个特征的状态与每个标本的年龄相关联，以评估骨结构的形成，以及每个特征状态下缝合线的融合程度。对19个表现状态个体发生变异的定性形态性状进行了统计分析。分析结果表明，不同年龄的人与顶额缝合、顶枕上缝合、顶枕外缝合、枕上-枕外缝合和枕基-翼状骨缝合相关的特征不同。结果表明，在北部海岸的标本中，头盖骨的物理成熟更早，这表明该物种的地理调整，或者是对几十年来渔业副产品对种群的巨大压力的生物反应。

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来源期刊

Iheringia Serie Zoologia 生物-动物学

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Iheringia, Série Zoologia, edited by the “Museu de Ciências Naturais” of the “Fundação Zoobotânica do Rio Grande do Sul”, publishes original research findings in zoology with emphasis on taxonomy, systematics, morphology, natural history, and community or population ecology of species from current Neotropical fauna. Scientific notes will not be accepted for publication. Species lists without a taxonomic approach, or that are not the result of studies on the ecology or natural history of communities will not normally be accepted. The same applies to identification keys of groups of taxa defined by political boundaries. Authors wishing to inquire about the scope of the journal or the suitability of a particular topic are encouraged to contact the Editorial Board prior to submission. Furthermore, articles with a main focus on agronomy, veterinary, zootechny or other areas involving applied zoology will not be accepted. Its abbreviated title is Iheringia, Sér. Zool., which should be used in bibliographies, footnotes and bibliographical references and strips.