Genetic and morphological variation in two littorinid gastropods: evidence for recent population expansions along the East African coast

Silva, Sara E.; Silva, Inês C.; Madeira, Carolina; Sallema, Rose; Paulo, Octávio S.; Paula, José

doi:10.1111/j.1095-8312.2012.02041.x

Cited by 27 publications

(24 citation statements)

References 52 publications

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“…The overall genetic diversity levels that were observed in this study were low compared with similar values published for other marine mangrove gastropods from the Indian Ocean (Crandall et al, 2007;Madeira et al, 2012;Silva et al, 2013). However, similarly low levels of genetic diversity were observed in the crab Uca annulipes (Silva, Mesquita & Paula, 2010b).…”

Section: Genetic Diversitysupporting

confidence: 74%

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

2016

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In tropical coastal ecosystems mangrove forests are important as feeding, spawning, breeding and nursery grounds for many marine species. High human population pressure in coastal areas has led to the loss and deterioration of mangrove habitats. Solar salt production can affect these habitats along the East African coast. Littorinid snails live on mangrove trees, forming an important component of the mangrove ecosystem and have been used as bioindicators of environmental health and community stress. Littoraria subvittata is the most abundant littorinid species in mangroves along the East African coast. Partial mitochondrial cytochrome oxidase subunit 1 (COI) gene sequences of 298 individuals were used to assess the impact of mangrove deforestation at salt ponds on the genetic diversity and structuring of L. subvittata populations, as well as to infer the demographic history of the species. Nucleotide and haplotype diversities were found to be lower in samples from mangroves at salt ponds than in samples from natural mangroves. The mean nucleotide diversity was 0.049 ± 0.036% and 0.115 ± 0.068% in mangroves at salt ponds and natural mangroves, respectively. The mean haplotype diversity was 0.23 ± 0.14 and 0.50 ± 0.14 in mangroves at salt ponds and natural mangroves, respectively. Analysis of molecular variance (AMOVA) detected a significant population structure (Ф st = 0.049; P < 0.0001) for the combined populations. Hierarchical AMOVA detected a significant population genetic structure only between populations from mangroves at salt ponds and natural mangroves (Φ ct = 0.022; P < 0.05), but not between any other groupings. Populations from natural mangrove sites showed a significant genetic structure (Ф st = 0.054, P < 0.0001), while populations from sites at salt ponds could not be differentiated (Ф st = −0.0026, P = 0.64). Reduced effective population size was observed in most samples from mangrove sites at salt ponds compared with natural mangrove. The direction of migrants was mostly from salt ponds to natural mangroves. These results show that salt ponds have a negative impact on the genetic diversity of L. subvittata populations and modify the population's genetic structure.

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Section: Genetic Diversitysupporting

confidence: 74%

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

2016

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“…Statistically significant differences between observed and expected distributions were evaluated with the sum of the square deviations (SSD) and Harpending’s raggedness index (raggedness) [61, 62]. Neutrality tests of Tajima’s D [63] and Fu’s F-statistics [64] were performed in Arlequin to detect changes in population size and/or estimating deviations from neutrality, assuming a constant population size at mutation-drift equilibrium [2]. Thus, evidence of expanding populations was assumed when significant negative values of Tajima’s D and Fu’s F-statistics were obtained [65, 66].…”

Section: Methodsmentioning

confidence: 99%

“…The theory of population genetics has suggested that marine organisms, such as fishes, that have a very short larval phase or a direct development, most likely have low dispersal ability, with consequent restrict genetic exchange between populations [2]. In contrast, species with a long larval stage probably have high dispersal ability, promoting interchanges of individuals and genes between different geographical regions [3], resulting in genetic homogeneity in populations [4].…”

Section: Introductionmentioning

confidence: 99%

“…Several factors, such as larval behavioural patterns, marine currents, coastal topography, temperature regimes and ecological requirements, may have a strong effect in the genetic structuring of marine organisms [3, 5, 6], even though the marine environment provides passive dispersal opportunities [7]. In the marine environment, relationships between populations are presumably the consequence of complex and dynamic interactions between the biological and physical environments, and the life histories, behaviour and physiology of individual taxa [2]. …”

Section: Introductionmentioning

confidence: 99%

“…Morphological variation of populations can be caused by additive genetic variation or processes of phenotypic plasticity in response to different selective pressures or environmental constraints [2, 8]. For fishes, in particular, body shape has been interpreted as a result of interaction between genetic and environmental factors [9, 10], especially during early development stages.…”

Section: Introductionmentioning

confidence: 99%

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Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

et al. 2016

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The knowledge of population structure of a species is essential to effectively assess and manage fisheries. In the present study, genetics, by mitochondrial DNA cytochrome b sequence analysis, and body geometric morphometrics were used to evaluate the existence of distinct populations of the forkbeard (Phycis phycis), an important commercial species in several European countries, especially Portugal and Spain. For geometric morphometric analysis, specimens were collected in the Northeast Atlantic Ocean—Azores, Madeira and mainland Portugal, and for genetic analysis, these samples were complemented with samples collected in the Mediterranean Sea—Spain, Italy and Croatia, in order to cover the entire distribution area of the species. Body shape of the forkbeard from the Northeast Atlantic was found to be highly variable. This variation was probably associated with different environmental factors between the study areas. Despite morphological variation, a low genetic differentiation between samples from different areas was found, most likely due to gene flow that occurred in the past or with the demographic history of the species. Moreover, the presence of unique haplotypes in the Northeast Atlantic and in the Mediterranean suggests that recent gene flow between populations from these areas should be limited. Altogether, a high haplotype diversity, a low nucleotide diversity, a “star-like” network and the results of the mismatch distribution, indicate a possible signature of recent population expansions, which probably started during the end of the Last Glacial Maximum and led to the colonization of the Northeast Atlantic and the Mediterranean.

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Population genetic structure and demographic history of the scallop Argopecten purpuratus from Peru and Northern Chile: implications for management and conservation of natural beds

et al. 2019

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Genetic and morphological variation in two littorinid gastropods: evidence for recent population expansions along the East African coast

Cited by 27 publications

References 52 publications

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

Genetic and Morphological Variation of the Forkbeard, Phycis phycis (Pisces, Phycidae): Evidence of Panmixia and Recent Population Expansion along Its Distribution Area

Population genetic structure and demographic history of the scallop Argopecten purpuratus from Peru and Northern Chile: implications for management and conservation of natural beds

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