Distinct inter and intrapopulation variation in the otolith shape and size of Mullus barbatus (Actinopterygii: Mullidae) from the Bizerte and Ghar El Melh lagoons in Tunisian waters

IF 1 4区生物学 Q4 ECOLOGY

Marine Biology Research Pub Date : 2023-05-01 DOI:10.1080/17451000.2023.2203503

Samia Ben Mohamed, M. Mejri, A. Chalh, Adel A. Basyouny Shahin, J. Quignard, M. Trabelsi, A. Ben Faleh

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引用次数: 1

Abstract

ABSTRACT This study aimed to assess the geographic variation in otoliths’ shape and size and the effect of potential fluctuating asymmetry (FA) in otolith size on the stock structure of Mullus barbatus collected from the Bizerte and Ghar El Melh lagoons located in northeastern Tunisia and to evaluate the relationship between the otolith mass asymmetry (OMA) and total length (TL). Analysis of the otolith shape showed a statistically significant intersexual shape difference, i.e. asymmetry, in the left and right and left-left and right-right otoliths between populations of the two lagoons. In addition, significant intersexual differences were detected in Lo, Wo, and Mo, as well as in FA, between the left and right otoliths among the two populations. Moreover, no statistically significant relationship (P > 0.05) was found between OMA and TL between and within the two populations. At the intrapopulation level, a significant intrasexual asymmetry was observed in the left and right, as well as on left-left and right-right sides, otoliths’ shape and size only within the Ghar El Melh lagoon. Discriminant function analysis of the otoliths’ contour shape confirmed the presence of two separate stocks representing the Bizerte and Ghar El Melh lagoons, which should be managed separately. This significant inter and intrapopulation asymmetry detected in otolith shape and size due to FA can be attributed to the instability of larval development caused either by environmental stress associated with variation in water temperature, salinity, feeding conditions and pollutants or due to poor living conditions of larvae resulting from unfavourable environments.

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突尼斯水域比塞特和加尔梅尔泻湖梭鲈耳石形状和大小的种群间和种群内差异

摘要本研究旨在评估突尼斯东北部比塞特和加尔梅尔泻湖采集的barbatus耳石形状和大小的地理差异，以及耳石大小的潜在波动不对称性(FA)对种群结构的影响，并评估耳石质量不对称性(OMA)与总长度(TL)之间的关系。耳石形状分析显示，两个泻湖种群的左右耳石、左右耳石和左右耳石存在统计学上显著的雌雄间性形状差异，即不对称。此外，在Lo, Wo和Mo以及FA中，两个人群的左耳石和右耳石之间存在显著的雌雄间性差异。此外，在两个人群之间和内部，OMA与TL之间没有统计学上的显著关系(P < 0.05)。在种群内水平上，仅在Ghar El Melh泻湖内，在左右、左右以及左右侧耳石的形状和大小上观察到明显的性内不对称。耳石轮廓形状的判别函数分析证实存在两个独立的群落，分别代表比塞特和加尔梅尔泻湖，应分别管理。由于FA导致的耳石形状和大小的显著种群间和种群内不对称性可归因于与水温、盐度、摄食条件和污染物变化相关的环境压力或不利环境导致的幼虫生存条件差造成的幼虫发育不稳定。

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来源期刊

Marine Biology Research 生物-海洋与淡水生物学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Marine Biology Research (MBRJ) provides a worldwide forum for key information, ideas and discussion on all areas of marine biology and biological oceanography. Founded in 2005 as a merger of two Scandinavian journals, Sarsia and Ophelia, MBRJ is based today at the Institute of Marine Research, Bergen, Norway. The Journal’s scope encompasses basic and applied research from all oceans and marine habitats and on all marine organisms, the main criterium for acceptance being quality.