Juan C. Vilardi

Fundación Ciencias Exactas y Naturales

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Beatriz O. Saidman

Fundación Ciencias Exactas y Naturales

Cecilia Bessega

Consejo Nacional de Investigaciones Científicas y Técnicas

Carolina L. Pometti

Fundación Ciencias Exactas y Naturales

Beatriz O. Saidman

University of Buenos Aires

Jorge L. Cladera

University of Buenos Aires

María Isabel Remis

University of Buenos Aires

Mauricio Ewens

Catholic University of Santiago del Estero

Esteban Hasson

University of Buenos Aires

M. Teresa Vera

National University of Tucumán

G. Calcagno

Fundación Ciencias Exactas y Naturales

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

University of Buenos Aires

Fundación Ciencias Exactas y Naturales

Centro Científico Tecnológico - Tucumán

Centro Científico Tecnológico - San Juan

National Agricultural Technology Institute

Institute of Astronomy and Space Physics

National Institute of Industrial Technology

National University of Tucumán

Instituto Nacional de Tecnologia

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Evidence Indicating That Argentine Populations of <I>Anastrepha fraterculus</I> (Diptera: Tephritidae) Belong to a Single Biological Species

Annals of the Entomological Society of America (2002)

Andrea C. Alberti Marcela S. Rodriguero Paula Gómez Cendra Beatriz O. Saidman Juan C. Vilardi

Anastrepha fraterculus (Wiedmann), a South American fruit fly, is an economically important pest for fruit-bearing plants of the neotropical region. Some evidence indicates that the nominal A. fraterculus comprises multiple cryptic species. In the current work we analyzed genetic variability and structure in Argentine populations of A. fraterculus based on eight isoenzymatic loci and the restriction patterns of a fragment of ≈500 bp belonging to the 16 S mitochondrial ribosomal DNA. The isoenzymatic analysis indicated a significant excess of homozygotes (FIS > 0), due to the fact that sampling sites probably do not constitute stable Mendelian populations. Genetic similarities ranged within values expected for conspecific populations and gene flow, estimated indirectly from the FST value, was high. The phenogram obtained by unweighted pair-group method with arithmetic average among populations shows disagreements with the expected result based on geographic distribution. Populations located in the neighborhood of Buenos Aires City show high diversity probably due to a high migration rate from different regions. The polymerase chain reaction (PCR)+restriction fragment-length polymorphism (RFLP) analysis of the mtDNA fragment involved 11 Argentine and one south Brazilian populations. The PCR product was digested by three endonucleases: Ssp-I, Ase-I, and Mnl-I. The observed patterns showed no variation within nor among the populations studied here but differed from the expected results based on the sequences recorded by other researchers for populations of north Brazil, Venezuela, and Mexico. The results so far obtained indicate that, despite the occurrence of macrogeographical variation, the Argentine and south Brazilian populations studied here belong to a single biological species.

Anastrepha

Genetic Variability

Population Genetics

10.1603/0013-8746(2002)095[0505:eitapo]2.0.co;2

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Citations (47)

Fine Scale Microevolutionary and Demographic Processes Shaping a Wild Metapopulation Dynamics of the South American Fruit Fly Anastrepha fraterculus

Neotropical Entomology (2022)

Damián Freilij Laura Inés Ferreyra Juan C. Vilardi Angeles I. Rodriguez Paula Gómez-Cendra

Metapopulation

Microevolution

Population Genetics

10.1007/s13744-022-00944-z

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Citations (1)

Genetic and morphometric markers are able to differentiate three morphotypes belonging to Section Algarobia of genus Prosopis (Leguminosae, Mimosoideae)

Plant Systematics and Evolution (2013)

Laura Inés Ferreyra Juan C. Vilardi Aníbal R. Verga Victoria López-Alonso Beatriz O. Saidman

Introgression

Mimosoideae

Prosopis

Hybrid zone

10.1007/s00606-013-0786-x

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Citations (22)

VARIATION IN THE INTERMITTENT BUZZING SONGS OF MALE MEDFLIES (DIPTERA: TEPHRITIDAE) ASSOCIATED WITH GEOGRAPHY, MASS-REARING, AND COURTSHIP SUCCESS

Florida Entomologist (2002)

R. D. Briceño William G. Eberhard Juan C. Vilardi Pablo Liedo Todd E. Shelly

Many aspects of the temporal pattern of sounds produced during the intermittent buzzing displays of pre-copulatory courtship by male medflies varied between wild flies from Costa Rica, Argentina, and Hawaii, and between mass-reared flies from Costa Rica, Argentina, Mexico, and Hawaii. There were no consistent differences when mass-reared strains were compared with the wild strains from the area where they originated in Costa Rica, Argentina and Hawaii. Buzzing sounds produced prior to successful mounting attempts did not differ consistently from those preceding unsuccessful mounts in flies from Costa Rica and Argentina. In strains from all sites, however, courtships in which buzzes were interrupted were more likely not to result in mounting of the female. There was a weak tendency for interruptions to be more common in mass-reared strains.

Ceratitis capitata

Courtship display

10.1653/0015-4040(2002)085[0032:vitibs]2.0.co;2

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Citations (32)

Lack of post-mating isolation between two populations of Anastrepha fraterculus from different ecological regions in Argentina.

Natalia Petit‐Marty Manuel Vera G. Calcagno Jorge L. Cladera Juan C. Vilardi

Anastrepha

Isolation

Reproductive isolation

Source

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Mating system and population structure of Acacia aroma and A. macracantha (Fabaceae)

American Journal of Botany (2004)

Paola Vanesa Casiva Juan C. Vilardi Ana M. Cialdella Beatriz O. Saidman

Acacia aroma and A. macracantha are closely related species that inhabit northern and central Argentina. The reproductive barriers between them seem to be weak. They exhibit low genetic differentiation, high levels of interspecific gene flow, and extensive areas of sympatry. Isoenzymatic approaches were used to evaluate the population structure and mating system parameters in natural Argentine populations of A. aroma and A. macracantha and to provide new tools for the analysis of relationships between these two species. All studied populations had high levels of genetic variability and no significant departures from Hardy‐Weinberg expectations, but the two species did not differ from each other. Most variability occured within populations. Mating system analysis showed high levels of outcrossing, no biparental inbreeding, and a high probability that individuals within progeny arrays are full rather than half sibs. In all A. aroma and A. macracantha populations, polymorphic loci had the same allelic variants, and no geographic or genetic isolation between species was found. The results favor the hypothesis that these two entities represent a single polymorphic species rather than two distinct species.

Outcrossing

Reproductive isolation

Population Genetics

10.3732/ajb.91.1.58

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Citations (31)

The broad-snouted caiman population recovery in Argentina. A case of genetics conservation

Amphibia-Reptilia (2017)

Patricia Susana Amavet Eva Carolina Rueda Juan C. Vilardi Pablo Siroski Alejandro Larriera

Caiman latirostris wild populations have suffered a drastic reduction in the past, and for that reason, a management and monitoring plan was applied since 1990 in Santa Fe, Argentina in order to achieve population recovery. Although ranching system has a noteworthy success in terms of population size recovering, there is no information about the estimation of population genetic parameters. In particular, the consequence of the bottleneck underwent by these populations has not been assessed. We evaluated variability and genetic structure of C. latirostris populations from Santa Fe through time, using microsatellites and mitochondrial DNA. Population genetic parameters were compared among four sites and three different periods to assess the impact of management activities, and effective population size was estimated in order to detect bottleneck events. We observed an increase in microsatellite variability and low genetic variability in mitochondrial lineages through time. Variability estimates are similar among sites in each sampling period; and there is scarce differentiation among them. The genetic background of each sampling site has changed through time; we assume this fact may be due to entry of individuals of different origin, through management and repopulation activities. Moreover, taking into account the expected heterozygosity and effective population size values, it can be assumed that bottleneck events indeed have occurred in the recent past. Our results suggest that, in addition to increasing population size, genetic variability of the species has been maintained. However, the information is still incomplete, and regular monitoring should continue in order to arrive to solid conclusions.

Population bottleneck

Effective population size

Genetic monitoring

Conservation Genetics

Genetic Variability

Population Genetics

Conservation Biology

Minimum viable population

10.1163/15685381-00003123

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Citations (12)

Negative genetic correlation between traits of the Drosophila head, and interspecific divergence in head shape

Heredity (2000)

Fabian M. Norry Juan C. Vilardi Esteban Hasson

Divergence (linguistics)

10.1046/j.1365-2540.2000.00735.x

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Citations (24)

Genetic and morphometric characterization of clones of Prosopis alba, Algarobia, selected for salt tolerance

Tree Genetics & Genomes (2014)

Leandro Roser Laura Inés Ferreyra Mauricio Ewens Juan C. Vilardi Beatriz O. Saidman

10.1007/s11295-013-0693-x

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Citations (6)

Host Association of Spodoptera frugiperda (Lepidoptera: Noctuidae) Corn and Rice Strains in Argentina, Brazil, and Paraguay

Journal of Economic Entomology (2012)

María Laura Juárez María Gabriela Murúa M.G. García Marta Ontivero M. Teresa Vera

Spodoptera frugiperda (J.E. Smith) is composed of two genetically distinct strains, the so-called corn strain and the rice strain. Whether the two strains differ in their host use is unclear, because laboratory experiments have not been able to show consistent host performance or preference differences between them, and field studies showed high rates of hybridization, as well as some degree asymmetric host use. To determine the distribution of the two strains and their association with host plants, we collected fall armyworm larvae from different crops (corn, rice, alfalfa, and sorghum) and grasses in 15 different localities over 4 yr in Argentina, Brazil, and Paraguay. The strain identity was analyzed using two polymorphisms in the mitochondrial cytochrome oxidase subunit I gene. We identified the corn and rice haplotypes and three types of populations were characterized based on the frequencies of the individuals that belonged to any of these haplotypes: in 44% of populations the corn haplotype predominated, in 44% of populations the rice haplotype was the most frequent, and 11% of populations showed both haplotypes at similar proportions. In total, eight populations (47%) showed the expected pattern, two populations (12%) were polymorphic within the same field, and seven populations (41%) showed the inverse pattern. Taken together, there was no consistent pattern of host association between the two sympatric genotypes and their respective host plants. This investigation supports the need for additional studies to determine which other forces keep the genotypes separate, and what is the degree of genetic differentiation between these populations.

Strain (injury)

10.1603/ec11184

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Citations (108)