Discrimination of the phenotypic sardine <i>Sardina pilchardus</i> stocks off the Moroccan Atlantic coast using a morphometric analysis

Mounir, Abdelaziz; Ewague, Abdelhadi; Znari, Mohammed; Elmghazli, H

doi:10.2989/1814232x.2019.1597765

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…Using a geomorphometric approach, we found intraspecific morphological differences in the LT clupeid species linked to the geographic origin of the specimens especially in L. miodon . Morphological variation can be driven by various environmental factors (Mounir et al, 2019; Sultan & Stearns, 2005). In our study, the level of geographically determined morphological variation differed between the studied fish species.…”

Section: Discussionmentioning

confidence: 99%

“…They were set using the tpsDig2 software v2.31 (Rohlf, 2018) using a tps file created with the tpsUtil software v1.78 (Rohlf, 2018). The landmarks were defined based on previous studies conducted with other species of clupeids (De La Cruz Agüero & Rodríguez, 2004; Mounir, Ewague, Znari, & Elmghazli, 2019; Silva, 2003), see Fig. 3.…”

Section: Methodsmentioning

confidence: 99%

“…Morphological variation can be driven by various environmental factors (Mounir et al, 2019;Sultan & Stearns, 2005). In our study, the level of geographically determined morphological variation differed between the studied fish species.…”

Section: Temporal Stability and Spatial Differences Of Infectionmentioning

confidence: 99%

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Host lifestyle and parasite interspecific facilitation mediate co-infection in a species-poor host-parasite system

Kmentová

Cruz-Laufer

Milec

et al. 2023

Preprint

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Pelagic zones are characterised by consistent large-scale patterns of circulation on local and global scales. Lake Tanganyika, as an enclosed ecosystem provides a playing field to study evolutionary and ecological processes applicable to open water areas worldwide. Despite their important role in the ecosystem, large scale patterns of the distribution of parasites remain poorly understood. Monogenean parasites have been proposed as tags for ecosystem dynamics because of their direct life cycle and often high host specificity. We combined data on spatiotemporal dynamics of parasites (Kapentagyrus, Monogenea) with morphological variation of clupeid hosts to investigate general patterns of host-parasite interactions in the pelagic zone of this ancient lake. Two dominant species of clupeid fishes in the pelagic zone of Lake Tanganyika are parasitised by two monogenean species of Kapentagyrus with different levels of host specificity. The host fishes are believed to perform lake-wide migrations driven by seasonal upwellings. To model spatiotemporal dynamics of host-parasite interaction, we used temporal data on monogenean infection along the North-South axis of Lake Tanganyika based on 1730 screened fishes and 3710 parasites together with phenotypic characterisation of the clupeid hosts. Infection levels are dependent on host body size with contrasting trends in the two parasite species. We reveal temporal stability of infection with spatial distribution restricted by host life strategies. Spatial differences between the parasite species most likely reflect differences in migration between the host species; these are also reflected by morphological differences between some clupeid populations. Our results also suggest mutual facilitation of infection. In conclusion, parasite infection is geographically restricted by host life strategies even in this ecosystem lacking physical barriers. Intensity of infection seems to be mainly driven by host size, with so far rarely reported mutual facilitation of co-infection. Temporal stability of infection in the pelagic zone contrasts with seasonal changes in abundance of clupeid hosts. Overall, our results suggest that parasite infection dynamics in the open water areas are dependent on life style and not host density.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Host lifestyle and parasite interspecific facilitation mediate co-infection in a species-poor host-parasite system

Kmentová

Cruz-Laufer

Milec

et al. 2023

Preprint

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“…In Mediterranean waters, a significant decline in biomass occurred with an increased risk of overexploitation, coinciding with a decrease in the size and conditions of the individuals (FAO, 2018). Numerous studies on the European sardine population structure have been carried out using several phenotypic methods, including body morphometrics (Baibai et al ., 2012; Mounir et al ., 2019; Silva, 2003), otolith shape (Jemaa et al ., 2015b; Neves et al ., 2021) and otolith microchemistry (Castro, 2007; Correia et al ., 2014), as well as distinctive genetic methods (Atarhouch et al ., 2006; Baibai et al ., 2012; Chlaida et al ., 2006; González & Zardoya, 2007; Imsiridou et al ., 2019; Kasapidis et al ., 2011; Laurent et al ., 2007; Laurent & Planes, 2007; Ruggeri et al ., 2012). These studies have led to inconclusive results on the identification of stock boundaries, particularly genetic studies that unanimously suggest a weak genetic structure for this species (Baibai et al ., 2012; Kasapidis, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparing otolith shape descriptors for population structure inferences in a small pelagic fish, the European sardineSardina pilchardus(Walbaum, 1792)

Neves

Veríssimo²,

Santos

et al. 2023

Journal of Fish Biology

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Otolith shape analysis has been one of the most used approaches to study population structure in the past decades. Currently, two sets of shape descriptors are used to perform otolith shape analysis, namely, Elliptic Fourier descriptor (EFd), which focuses on the overall otolith shape differences, and Discrete Wavelet descriptor (DWd), which is sensible to local differences along the otolith contour. Here, the authors conducted a comparative analysis of the performance of both the descriptors in reconstructing the population structure and connectivity patterns in a small pelagic fish species with a wide geographical distribution and fast growth rate, the European sardine Sardina pilchardus (Walbaum, 1792), for the first time. A combination of each otolith shape descriptor and shape indices was explored using multivariate statistical methods. The two otolith shape descriptors showed similar, although limited, overall classification success associated with the population dynamic characteristics of the species. Both descriptors point to migration among adjacent areas, such as northern Atlantic locations, eastern Mediterranean and even across well-defined physical obstacles, such as the Strait of Gibraltar, among Atlantic and western Mediterranean locations. Both descriptors supported the division of the populations of Mediterranean waters into three main groups but slightly differed in the group limits of the Atlantic waters. A comparison of the present results with those from previous otolith shape analysis studies using EFd on a decadal time scale revealed differences in the population structure and connectivity patterns compared to the earlier period.These differences not only may be attributed to changes in environmental variables leading to changes in population dynamics but can also be the result of the sardine biomass sharp decrease that occurred in the past decade.

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“…Figure 1. Sampling areas and delimitation of areas of three stocks of Atlantic Moroccan European sardine S.pilchardus(Mounir et al, 2019).…”

mentioning

confidence: 99%

Discrimination of the sardine stocks by using a morphometric and meristic analysis along the Moroccan Atlantic coast

al.¹

2022

Egypt. J. of Aquatic Biolo. and Fish.

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Discrimination of the phenotypic sardine Sardina pilchardus stocks off the Moroccan Atlantic coast using a morphometric analysis

Cited by 15 publications

References 30 publications

Host lifestyle and parasite interspecific facilitation mediate co-infection in a species-poor host-parasite system

Host lifestyle and parasite interspecific facilitation mediate co-infection in a species-poor host-parasite system

Comparing otolith shape descriptors for population structure inferences in a small pelagic fish, the European sardineSardina pilchardus(Walbaum, 1792)

Discrimination of the sardine stocks by using a morphometric and meristic analysis along the Moroccan Atlantic coast

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