Genetic diversity and adaptability of<i>Sarotherodon melanotheron</i>(Cichlidae) in coastal ecosystem

Yoboue, Ahou Nicole; Adépo-Gourène, Béatrice; Seka, D.; Durand, Jean‐Dominique; Panfili, Jacques; Laë, Raymond

doi:10.1080/03949370.2011.643921

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The optimal temperature range for its reproduction spreads between 17 and 32°C (Philippart and Ruwet, 1982). What is most characterizes this species is its strong euryhalinity (Panfili et al, 2006;Yoboué et al, 2012) that allows to survive at salinities superior than 0.3 mg l -1 (case of Lake Nokoué in Benin) (Chikou et al, 2013) and probably develop a normal gametogenesis and reproduce at high salinities (fry were observed up to 85,10 3 mg l -1 in the wild) (Pauly, 1976).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of zootechnical and reproductive parameters of wild populations of Sarotherodon melanotheron Rppell, 1852 of Southern Benin raised in captivity

Amoussou¹,

Toguyéni²,

Toko³

et al. 2017

Int. J. Fish. Aquac.

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Tilapia Sarotherodon melanotheron is naturally adapted to both fresh and brackish environments. In order to improve its farming potential, this study evaluated the growth, survival and reproduc tive parameters of individuals from three lakes of southern Benin according to their sex and age at experimental fishing. During fry rearing and breeding, fish were fed with commercial feed granulated. The chlorophyll a concentration and the abundance of plankton were determined by molecular absorption spectrometry and under a light microscope respectively. Physico -chemical parameters were within acceptable limits for good survival and growth of S. melanotheron. Together with chlorophyll a, three phytoplankton species and five zooplankton species were also available in the rearing tanks. At the end of the experiment (90 days post nursery), most of the growth parameters did not vary significantly according to the waterway of origin and the sex. However, the a ge at experimental fishing influenced significantly most of the growth parameters. The individuals from Lake Nokoué and Lake Toho were characterized by higher body weight, total length, standard length, weight gain, average weight gain, daily weight gain, nutritive quotient, survival rate, net biomass, biomass per square meter while Grand-Popo Lagoon individuals were characterized by higher ccondition factor and a weak ponderal and linear specific growth rates. Overall, reproductive parameters were higher i n females than males. The majority of males were with empty testicles, while females with ova were expelled by manual pressure. S. melanotheron individuals from the considered lakes can be recommended for selective breeding program in fresh and brackish wa ters.

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Section: Discussionmentioning

confidence: 99%

Evaluation of zootechnical and reproductive parameters of wild populations of Sarotherodon melanotheron Rppell, 1852 of Southern Benin raised in captivity

Amoussou¹,

Toguyéni²,

Toko³

et al. 2017

Int. J. Fish. Aquac.

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“…It is, therefore, unlike that variations in reproductive traits reflect genetic differences among individuals. Moreover, while the populations where the initial bloodstocks were collected in the Niayes area in Senegal are genetically very structured [23][24][25], fish used in this study were obtained by natural breeding from couples whose parents were maintained in laboratory conditions for several generations. Also, apart from salinity, all the other physicochemical factors such as temperature, photoperiod, dissolved oxygen and feeding conditions were similar across rearing environments.…”

Section: Discussionmentioning

confidence: 99%

Common Garden Experiments Confirm the Impact of Salinity on Reproductive Traits that is Observed in Wild Populations of the Back-Chinned Tilapia Sarotherodon melanotheron

Gueye¹

2016

Int J Aquac Fish Sci

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The black-chinned tilapia Sarotherodon melanotheron is a very hardy species, particularly notable for its ability to tolerate a wide range of environmental salinities. The impact of environmental salinity on reproductive traits has been well documented in this species under natural conditions, but few studies have been experimentally conducted to prove such a relationship. This study assessed the effects of different salinities on the reproductive traits of S. melanotheron in experimental conditions. The number of spawning eggs as well as the mean number and frequency of incubation showed significant relationships with ambient salinity. The average number of incubations and spawning eggs were lower in hypersaline water (70 psu) compared the freshwater (0 psu) and seawater (35 psu). However the egg quality, as measured by the percentage of black eggs, was higher in hypersaline water. These variations in reproductive traits do not reflect genetic differences among individuals because fish used in common garden experiments were obtained by natural breeding from couples, the initial brood stock of which was from the same wild population. The results therefore confirm findings of previous studies in natural habitats, where variations in salinity are associated with differences in reproductive traits among populations. The lower number and frequent incubations recorded in hypersaline water could be an adaptive response to sustain the population dynamics despite the constraints imposed by extreme salinity.

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Environmental variables, habitat discontinuity and life history shaping the genetic structure of Pomatoschistus marmoratus

González‐Wangüemert

Vergara-Chen

2014

Helgol Mar Res

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Coastal lagoons are semi-isolated ecosystems exposed to wide fluctuations of environmental conditions and showing habitat fragmentation. These features may play an important role in separating species into different populations, even at small spatial scales. In this study, we evaluate the concordance between mitochondrial (previous published data) and nuclear data analyzing the genetic variability of Pomatoschistus marmoratus in five localities, inside and outside the Mar Menor coastal lagoon (SE Spain) using eight microsatellites. High genetic diversity and similar levels of allele richness were observed across all loci and localities, although significant genic and genotypic differentiation was found between populations inside and outside the lagoon. In contrast to the F ST values obtained from previous mitochondrial DNA analyses (control region), the microsatellite data exhibited significant differentiation among samples inside the Mar Menor and between lagoonal and marine samples. This pattern was corroborated using Cavalli-Sforza genetic distances.The habitat fragmentation inside the coastal lagoon and among lagoon and marine localities could be acting as a barrier to gene flow and contributing to the observed genetic structure. Our results from generalized additive models point a significant link between extreme lagoonal environmental conditions (mainly maximum salinity) and P. marmoratus genetic composition. Thereby, these environmental features could be also acting on genetic structure of coastal lagoon populations of P. marmoratus favoring their genetic divergence. The mating strategy of P. marmoratus could be also influencing our results obtained from mitochondrial and nuclear DNA. Therefore, a special consideration must be done in the selection of the DNA markers depending on the reproductive strategy of the species.

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Genetic diversity and adaptability ofSarotherodon melanotheron(Cichlidae) in coastal ecosystem

Cited by 5 publications

References 22 publications

Evaluation of zootechnical and reproductive parameters of wild populations of Sarotherodon melanotheron Rppell, 1852 of Southern Benin raised in captivity

Evaluation of zootechnical and reproductive parameters of wild populations of Sarotherodon melanotheron Rppell, 1852 of Southern Benin raised in captivity

Common Garden Experiments Confirm the Impact of Salinity on Reproductive Traits that is Observed in Wild Populations of the Back-Chinned Tilapia Sarotherodon melanotheron

Environmental variables, habitat discontinuity and life history shaping the genetic structure of Pomatoschistus marmoratus

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