Otolith chemistry as a tool to infer about the population structure of the bigtooth corvina (Isopisthus parvipinnis) in the Southeast Brazilian coast

Sea urchins play important roles in marine ecosystems as key herbivores and some species have wide geographic range. The Atlantic white sea urchin Tripneustes ventricosus is abundant in many rock reefs of the eastern and western Atlantic, and may be found in high densities in Atolls and Archipelagos. Despite the importance of sea urchins in insular ecosystems, there is no study evaluating the genetic structure and the origin of the white sea urchin in isolated ecosystems. Such information is crucial to understand the connectivity and genetic diversity of these populations from the tropical Atlantic provinces. To evaluate the origin of the white sea urchin in Fernando de Noronha Archipelago and the genetic features of this population, we conducted studies on the population structure of the white sea urchin using mitochondrial DNA (COI), in two regions within the Brazilian biogeographic province and compared with other regions in the Atlantic. The white sea urchin from Fernando de Noronha was found to be genetically distinct, with FST ranging from 0.3 to 0.9 from other populations in Atlantic. The sharing of haplotypes between the Brazilian coast and the archipelago suggests that insular species derived from the Brazilian coast, rather than the East Atlantic. Moreover, all other Atlantic populations were genetically isolated, with low genetic diversity being a common characteristic among them (ranging from 0.0011 to 0.0022). The low connectivity found within populations might be related to the presence of soft barriers among the Brazilian biogeographic province. The low nucleotide diversity may also suggest that T. ventricosus may have undergone bottleneck processes at some stage of their evolution. This study has important implications on the geographic distribution, population structure and gene flow of the white sea urchin among the Atlantic regions. Further studies should evaluate the biological and ecological aspects of the species in both insular and continental marine ecosystems.

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Migratory behaviour and otolith chemistry suggest fine-scale sub-population structure within a genetically homogenous Atlantic Cod population

Environmental Biology of Fishes ◽

10.1007/s10641-010-9669-y ◽

2010 ◽

Vol 89 (3-4) ◽

pp. 383-397 ◽

Cited By ~ 43

Author(s):

Henrik Svedäng ◽

Carl André ◽

Patrik Jonsson ◽

Mikael Elfman ◽

Karin E. Limburg

Keyword(s):

Population Structure ◽

Atlantic Cod ◽

Otolith Chemistry ◽

Fine Scale ◽

Migratory Behaviour

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Population structure of red drum ( Sciaenops ocellatus ) as determined by otolith chemistry

Marine Biology ◽

10.1007/s00227-003-1254-x ◽

2004 ◽

Vol 144 (5) ◽

pp. 855-862 ◽

Cited By ~ 45

Author(s):

H. M. Patterson ◽

N. Julien ◽

R. S. McBride

Keyword(s):

Population Structure ◽

Red Drum ◽

Sciaenops Ocellatus ◽

Otolith Chemistry

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Genetic diversity of three ornamental reef fishes (Families Pomacanthidae and Chaetodontidae) from the Brazilian coast

Brazilian Journal of Biology ◽

10.1590/s1519-69842007000500017 ◽

2007 ◽

Vol 67 (4 suppl) ◽

pp. 925-933 ◽

Cited By ~ 9

Author(s):

PRAM. Affonso ◽

PM. Galetti Jr.

Keyword(s):

Population Structure ◽

Genetic Differentiation ◽

Reef Fishes ◽

Population Diversity ◽

Brazilian Coast ◽

Selective Pressures ◽

Biogeographic History ◽

Ecological Features ◽

Brazilian Province ◽

Ornamental Species

Reef fishes of the families Pomacanthidae (angelfish) and Chaetodontidae (butterflyfish) are popular ornamental species, intensively harvested for the aquarium trade. The impacts of such activity on intra-specific diversity and reef ecosystems are still poorly understood in the south Atlantic. In the present work, a fine-scale genetic analysis using RAPD markers was performed in distinct samples of the queen angelfish (Holacanthus ciliaris), French angelfish (Pomacanthus paru), and banded butterflyfish (Chaetodon striatus) along the Brazilian coast. Most of the genetic variation in the three species was related to intra-population diversity. However, AMOVA results demonstrated that H. ciliaris presents a subtle population structure (sigmast = 0.132, P = 0.003), while P. paru and C. striatus present low genetic differentiation, especially remarkable in the latter (sigmast = 0.090, P = 0.001 and sigmast = 0.041, P = 0.028, respectively). Gene flow (Nm) was also higher in C. striatus than in the angelfish species. The reported patterns of genetic differentiation contrast with the similar pelagic stage of the selected species, suggesting that larval dispersal per se is a poor predictor of population structure in these reef fishes. Ecological features coupled with biogeographic history and distinct local selective pressures might play a major role on the genetic composition of each species. Although preliminary, the present results provide a baseline for monitoring the genetic variability in these reef species. These differences in the genetic structure among co-occurring species should be taken into consideration for the conservation of eventual evolutionary units along the Brazilian Province.

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Population connectivity and larval dispersal of the exploited mangrove crab Ucides cordatus along the Brazilian coast

PeerJ ◽

10.7717/peerj.4702 ◽

2018 ◽

Vol 6 ◽

pp. e4702 ◽

Cited By ~ 4

Author(s):

Fábio B. Britto ◽

Anders J. Schmidt ◽

Adriana M.F. Carvalho ◽

Carolina C.M.P. Vasconcelos ◽

Antonia M. Farias ◽

...

Keyword(s):

Genetic Diversity ◽

Population Structure ◽

Gene Flow ◽

Population Connectivity ◽

Brazilian Coast ◽

Fishery Resource ◽

Ucides Cordatus ◽

Migration Rates ◽

Mangrove Crab ◽

Key Species

Background The mangrove crab Ucides cordatus is considered a key species for the ecological balance of mangrove forests and a major source of employment and income for traditional crab collectors in Brazil. Several studies evidenced weak genetic variation among populations due to an efficient larval transport. However, gene flow patterns of the species is poorly understood, with no information about migration rates. The influence of the two main Brazilian currents in larval dispersion is also not clear. In order to provide baseline information for conservation, planning and management of this important fishery resource, the present study aimed to estimate and evaluate spatial distribution of genetic diversity, migration rates and gene flow directivity among populations of U. cordatus in Brazil. Methods Nine microsatellites were used to resolve population structure of 319 crabs collected from six sites located along the Brazilian coast. The degree of geographical differentiation included estimates of genetic diversity, population structure and gene flow models, with spatial analysis of shared alleles (SAShA), isolation by distance tests, AMOVA, discriminant analysis of principal components (DAPC) and Bayesian clustering. We estimated the amount of ongoing gene flow between clusters using the coalescent-based method implemented in Migrate-N. Results Loci were highly polymorphic (average of 12.4 alleles per locus) evidencing high genetic variability. There was significant differentiation among localities, despite of the low value of FST (= 0.019; P < 0.001). FST and Jost’s D indexes were also estimated in pairwise comparisons and showed significant differences between most of the surveyed site pairs (P < 0.05). Structure evidenced a single genetic group among samples, however SAShA pointed to a non-panmictic condition (P = 0.011). AMOVA detected four statistical significant clusters with low level of differentiation (FCT = 0.037; P = 0.023). The gene flow model that best described the population connectivity was the island model, with ∼24 crabs being exchanged among localities per generation. Discussion The high migration rates found among localities seem to be the main force acting to sustain the distribution of the genetic diversity of U. cordatus. Despite the high gene flow and the weak population structure among samples, the significant genetic differences found suggest that gene flow alone does not bypass the effects of genetic drift, natural selection and/or human exploitation. These findings are vital for the establishment of a database to be used in the development of conservation programs.

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New genetic insights about hybridization and population structure of hawksbill and loggerhead turtles from Brazil

10.1101/2020.04.17.046623 ◽

2020 ◽

Cited By ~ 1

Author(s):

Larissa S. Arantes ◽

Sibelle T. Vilaça ◽

Camila J. Mazzoni ◽

Fabrício R. Santos

Keyword(s):

Population Structure ◽

Sea Turtles ◽

Phylogenetic Analyses ◽

Sea Turtle ◽

Brazilian Coast ◽

Eretmochelys Imbricata ◽

F1 Hybrid ◽

F2 Hybrids ◽

Loggerhead Turtles ◽

History Of

AbstractAn extremely high incidence of hybridization among sea turtles is found along the Brazilian coast. To understand this atypical phenomenon and its impact on sea turtle conservation, research focused in the evolutionary history of sea turtles is fundamental. We assessed high quality multilocus haplotypes of 143 samples of the five species of sea turtles that occur along the Brazilian coast to investigate the hybridization process and the population structure of hawksbill (Eretmochelys imbricata) and loggerhead turtles (Caretta caretta). The multilocus data were initially used to characterize interspecific hybrids. Introgression (F2 hybrids) was only confirmed in hatchlings of F1 hybrid females (hawksbill × loggerhead), indicating that introgression was either previously overestimated and F2 hybrids may not survive to adulthood, or the first-generation hybrid females nesting in Brazil were born as recent as few decades ago. Phylogenetic analyses using nuclear markers recovered the mtDNA-based Indo-Pacific and Atlantic lineages for hawksbill turtles, demonstrating a deep genetic divergence dating from the early Pliocene. In addition, loggerhead turtles that share a common feeding area and belong to distinct Indo-Pacific and Atlantic mtDNA clades present no clear genetic differentiation at the nuclear level. Finally, our results indicate that hawksbill and loggerhead rookeries along the Brazilian coast are likely connected by male-mediated gene flow.

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Advances in Fish Tagging and Marking Technology

Advances in Fish Tagging and Marking Technology ◽

10.47886/9781934874271.ch28 ◽

2012 ◽

Keyword(s):

Population Structure ◽

Growth Rates ◽

Inductively Coupled Plasma ◽

Sexual Maturity ◽

Current Data ◽

Otolith Chemistry ◽

Inductively Coupled ◽

Spatial Differences ◽

General Movement ◽

The 1960S

Abstract.—The population structure of the eastern Australian salmon Arripis trutta stock in the waters of southeastern (SE) Australia was examined using information provided by historical as well as current data sources. An extensive tag-recapture program and aging study undertaken during the 1960s demonstrated widespread mixing of the A. trutta population in SE Australian waters and established a robust model of general movement of fish from Tasmania north to Victoria and NSW with the approach of sexual maturity at ~four years of age. However, this work also hypothesized that the portion of the stock at Flinders Island in Tasmanian waters was resident and did not undergo this northward migration. Otolith chemistry analyses were therefore used as a tool in a ‘weight of evidence’ approach to further examine the population structure of the A. trutta stock in SE Australia. Samples of five year old A. trutta for analysis of otolith chemistry were collected over seven weeks from two sites (10 per site) within each of four locations: northern NSW, southern NSW, Victoria and Tasmania. The cores and edges of otoliths were analyzed using laser ablation inductively coupled plasma mass spectrometry. Univariate analyses did not find spatial differences for any of the elements Li, Na, Mg, Mn, Ba or Sr between locations. Multivariate analyses however, did find differences between the multi-element ‘fingerprints’ of fish from Tasmania compared to each of the other locations (which were similar). This difference was driven by a group of fish collected from Flinders Island in north-eastern Tasmanian waters. The fish collected at this site were also significantly smaller at five years of age than fish from all other sites, indicating reduced growth rates. The lack of consequential and definitive differences in otolith chemistry data combined with the highly migratory nature of A. trutta in this region demonstrated by tagging studies confirm that the most likely stock structure model for A. trutta in SE Australia is of a single well mixed biological stock spanning Tasmania, Victoria and NSW with fish moving north from Tasmania to mainland Australia with the approach of sexual maturity. However, the reduced growth rates and distinct elemental signature for A. trutta from Flinders Island highlights the need for further work to examine the preexisting hypothesis of a potential resident sub-population there.

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Strong population structure deduced from genetics, otolith chemistry and parasite abundances explains vulnerability to localized fishery collapse in a large Sciaenid fish,Protonibea diacanthus

Evolutionary Applications ◽

10.1111/eva.12499 ◽

2017 ◽

Vol 10 (10) ◽

pp. 978-993 ◽

Cited By ~ 13

Author(s):

Laura Taillebois ◽

Diane P. Barton ◽

David A. Crook ◽

Thor Saunders ◽

Jonathan Taylor ◽

...

Keyword(s):

Population Structure ◽

Otolith Chemistry ◽

Fishery Collapse ◽

Sciaenid Fish

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New Genetic Insights About Hybridization and Population Structure of Hawksbill and Loggerhead Turtles From Brazil

Journal of Heredity ◽

10.1093/jhered/esaa024 ◽

2020 ◽

Vol 111 (5) ◽

pp. 444-456

Author(s):

Larissa S Arantes ◽

Sibelle T Vilaça ◽

Camila J Mazzoni ◽

Fabrício R Santos

Keyword(s):

Population Structure ◽

Sea Turtles ◽

Phylogenetic Analyses ◽

Sea Turtle ◽

Brazilian Coast ◽

Eretmochelys Imbricata ◽

F1 Hybrid ◽

F2 Hybrids ◽

Loggerhead Turtles ◽

History Of

Abstract An extremely high incidence of hybridization among sea turtles is found along the Brazilian coast. This atypical phenomenon and its impact on sea turtle conservation can be elucidated through research focused on the evolutionary history of sea turtles. We assessed high-quality multilocus haplotypes of 143 samples of the 5 species of sea turtles that occur along the Brazilian coast to investigate the hybridization process and the population structure of hawksbill (Eretmochelys imbricata) and loggerhead turtles (Caretta caretta). The multilocus data were initially used to characterize interspecific hybrids. Introgression (F2 hybrids) was only confirmed in hatchlings of F1 hybrid females (hawksbill × loggerhead), indicating that introgression was either previously overestimated and F2 hybrids may not survive to adulthood, or the first-generation hybrid females nesting in Brazil were born as recent as few decades ago. Phylogenetic analyses using nuclear markers recovered the mtDNA-based Indo-Pacific and Atlantic lineages for hawksbill turtles, demonstrating a deep genetic divergence dating from the early Pliocene. In addition, loggerhead turtles that share a common feeding area and belong to distinct Indo-Pacific and Atlantic mtDNA clades present no clear genetic differentiation at the nuclear level. Finally, our results indicate that hawksbill and loggerhead rookeries along the Brazilian coast are likely connected by male-mediated gene flow.

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