Santiago Benitez-Vieyra

Santiago Benitez-Vieyra
National University of Cordoba, Argentina | UNC · Institute for Multidisciplinary Plant Biology (IMBIV)

Dr.

About

52
Publications
25,251
Reads
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691
Citations
Additional affiliations
November 2015 - present
National University of Cordoba, Argentina
Position
  • Researcher
August 2010 - November 2015
National University of Cordoba, Argentina
Position
  • Research Associate

Publications

Publications (52)
Article
Full-text available
Within-individual variation in floral advertising and reward traits is a feature experienced by pollinators that visit different flowers of the same plant. Pollinators can use advertising traits to gather information about the quality and amount of rewards, leading to the evolution of signal-reward correlations. As long as plants differ in the reli...
Article
Full-text available
1. A major challenge in evolutionary ecology is to understand how coevolutionary processes shape patterns of interactions between species at community level. Pollination of flowers with long corolla tubes by long-tongued hawkmoths has been invoked as a showcase model of coevolution. Recently, optimal foraging models have predicted that there might...
Article
Full-text available
Quaternary environmental changes substantially impacted the landscape and promoted rapid evolutionary changes in many species; however, analyses of adaptive phenotypic variation in plants have usually neglected the underlying historical context. Here we associate phylogeography and phenotypic evolution by analyzing the divergence of Calceolaria pol...
Article
Full-text available
Covariation among traits can modify the evolutionary trajectory of complex structures. This process is thought to operate at a microevolutionary scale, but its long‐term effects remain controversial because trait covariation can itself evolve. Flower morphology, and particularly floral trait (co)variation, has been envisioned as the product of poll...
Article
Full-text available
Due to drastic changes in pollinators between native and invaded habitats, we might expect that pollinator-mediated selection on floral traits of alien plants differ from that in their native ranges. Here, through geometric morphometric tools and phenotypic selection analyses, we examined whether adaptation in flower shape and length occurred in Ni...
Article
Full-text available
Type 2 diabetes, one of the major causes of death and disability worldwide, is characterized by problems in the homeostasis of blood glucose. Current preventive policies focus mainly on individual behaviors (diet, exercise, salt and alcohol consumption). Recent hypotheses state that the higher incidence of metabolic disease in some human population...
Preprint
Full-text available
Type 2 diabetes, one of the major causes of death and disability worldwide, is characterized by problems in the homeostasis of blood glucose. Current preventive policies focus mainly on individual behaviors (diet, exercise, salt and alcohol consumption). Recent hypotheses state that the higher incidence of metabolic disease in some human population...
Article
Aims Adaptive convergence in floral phenotype among plants sharing a pollinator guild has been acknowledged in the concept of pollination syndrome. However, many plants display traits associated with a given syndrome, but are visited by multiple pollinators. This situation may indicate the beginning of a pollinator shift or may result in a stable s...
Article
It is important to understand the historical precedents of current situations to be able to anticipate where the current global environmental and climatic change may lead. Geo-historical data provide information beyond the limitations of instrumental data. This study aims to reconstruct components of the palaeoclimatic and palaeoenvironmental histo...
Conference Paper
Full-text available
La diabetes es es una de las mayores causas de muertes y discapacidad a nivel mundial. Su prevalencia se encuentra en aumento desde hace décadas en el mundo y en la Argentina y se la considera un problema de gran relevancia para la salud pública. La diabetes de tipo 2, la forma más común, es causada por la resistencia del cuerpo a la acción de la i...
Article
Full-text available
Organism shape changes predictably during ontogeny, resulting in specific patterns of ontogenetic allometry. In several plant and animal lineages, among‐species variation in the shape of mature organisms mirrors variation along their growth trajectories. Hence, ontogenetic allometry is an important bias in evolution. This bias should be stronger at...
Article
Full-text available
Background Parrots (Psittacidae Family) are one of the most colorful groups of birds in the world, their colors produced both structurally and via unusual pigments (psittacofulvins). Most species are considered to be monogamous, and many have been viewed historically as sexually monomorphic and monochromatic. However, studies using morphometric ana...
Article
Full-text available
Introduced plants become decoupled from their usual pollinators and by relying on resident pollinator species or other reproductive strategies become established in new areas, spread and, eventually, invade. Here, using breeding system experiments, we studied the reproductive biology of the bird-pollinated South American species Nicotiana glauca ac...
Article
Full-text available
Background: Despite Stebbins' principle of the most efficient pollinator was proposed decades ago, most important pollinators are still mainly identified using the frequency of visits to flowers. This shortcoming faces us with a gap between the characterization of the flower visitors of a plant species and reliable estimation of the plant fitness c...
Article
Background: Despite Stebbins' principle of the most efficient pollinator was proposed decades ago, most important pollinators are still mainly identified using the frequency of visits to flowers. This shortcoming faces us with a gap between the characterization of the flower visitors of a plant species and reliable estimation of the plant fitness...
Article
Full-text available
Colors are important vehicles for social signals in many taxa. In Squamata, previous studies have linked color characteristics and chromatic diversity to sexual selection and, particularly, species showing male-biased body size dimorphism also showed male-biased dichromatism and color diversity. Sexual dichromatism may occur in body regions used fo...
Article
The use of multiple regression analysis to quantify the regime and strength of natural selection in nature has been an influential approach in evolutionary biology over the last 36 years. However, many studies fail to report the protocol of estimation of selection coefficients (selection gradients) and the specific model assumptions, thus failing t...
Poster
Full-text available
Morphospaces, or phenotypic spaces in general, are representations of the multidimensional nature of organisms. The clumped distribution of species inside morphospace imposes an outstanding question: Does it mirror the narrow set of solutions to functional problems or is it the product of constrictions and channelling in genetic and developmental s...
Article
Full-text available
Phenotypic intermediacy is an indicator of putative hybrid origin, and has provided the main clues to discovering hybrid plants in nature. Mandevilla pentlandiana and M. laxa (Apocynaceae) are sister species with clear differences in floral phenotype and associated pollinator guilds: diurnal Hymenoptera and nocturnal hawkmoths, respectively. The pr...
Article
Full-text available
Salvia subg. Calosphace (Lamiaceae, Lamiales) is a highly diverse clade endemic to the New World. The phylogenetic relationships of Calosphace have been previously investigated using DNA sequences of nuclear ITS region and plastid psbA–trnH intergenic spacer, but the resulting trees lack resolution and support for many clades. The present paper rea...
Article
Full-text available
The astounding variety of angiosperm flower morphologies has evolved in response to many selective forces. Flower development is highly coordinated and involves developmental associations between size and shape, ontogenetic allometry, which in turn affect the morphology of mature flowers. Although ontogenetic allometries can act as a developmental...
Article
Full-text available
Extrafloral nectaries can occur in both vegetative and reproductive plant structures. In many Rubiaceae species in the Brazilian Cerrado, after corolla abscission, the floral nectary continues to secret nectar throughout fruit development originating post-floral pericarpial nectaries which commonly attract many ant species. The occurrence of such n...
Data
Sample-based rarefaction and extrapolation curves with Hill numbers of the diversity order of q = 0 for the Tocoyena formosa’s PPN-visiting ant fauna. Solid and dotted lines represent rarefaction and extrapolation curves, respectively. Shaded area shows the 95% confidence intervals after 250 bootstraps. (TIF)
Data
Pre-dispersal seed predators of Tocoyena formosa. Abundance, relative frequency and mean number (±SD) of seed predators per fruit (n = 245 fruits) among Tocoyena formosa individual plants. (DOCX)
Data
Ectatomma tuberculatum visiting Tocoyena formosa pericarpial nectaries. (A) and (B) show E. tuberculatum carrying a nectar droplet between its jaws (arrows). (TIF)
Data
Ant species observed visiting PPNs on control branches of Tocoyena formosa. Total ant abundance, Mean abundance (±SD) per census, mean visitation frequency (±SD). (DOCX)
Article
Full-text available
Optimization of flower phenotypes to ensure pollination by agents differing in their match with fertile flower structures can involve fitness trade-offs if the aspects of the phenotype that enhance the fitness contribution of one pollinator are detrimental for pollination by the other agents. If these trade-offs are substantial, flower optimization...
Article
Full-text available
Most predator and parasitoid functional response studies have been carried out by using experimental designs where insects are confined to an arena and subsequently exposed to different host densities, which are evaluated individually. In the case of a parasitoid that looks for profitable patches, this design forces it to use the single host densit...
Article
Full-text available
Many angiosperm lineages present transitions from bee to hummingbird pollination. The flower design in most of these lineages includes either corolla tubes or nectar spurs, structures that commonly experienced an elongation with the acquisition of hummingbird pollination. It is proposed that this increases the fit between the bird head and flower s...
Article
Full-text available
For birds, plumage color perception is critical in social interactions such as courtship, in both monochromatic and dichromatic species. In the Eared Dove (Zenaida auriculata), perhaps the most abundant South American Columbiforme, the plumage of males and females looks alike and both sexes share the same melanistic coloration with gray and pink to...
Data
Crowntable.txt. Table (example) containing wavelength and spectrophotometric values of the crown of males, females and juveniles. To download all the body regions data follow this link: https://dx.doi.org/10.6084/m9.figshare.3364681. (TXT)
Data
Valdez DJ routine work. Routine work in R (script) showing the different steps performed to analyze the data. For all body regions (except for the crown.) must be eliminated step four in the routine work. (R)
Article
Full-text available
Background and aims: Phenotypic diversification of flowers is frequently attributed to selection by different functional groups of pollinators. During optimization of floral phenotype, developmental robustness to genetic and non-genetic perturbations is expected to limit the phenotypic space available for future evolutionary changes. Although adap...
Article
Full-text available
Flowers may be interpreted as complex combinations of organs functionally coordinated to attract pollinators and to mechanically interact with the pollinator’s body, particularly when flower mechanisms are actively handled by pollinators. Thus, a functional modularity of traits in keel flowers (Fabaceae) was expected because of a compartmentalizati...
Conference Paper
Full-text available
When pollinators visit a sequence of flowers they experience a continuum of variation in advertisement traits and in the amount and quality of reward, ranging from full rewarding to deceptive flowers. They can combine this information, evaluate the reliability of plant signals and use previous knowledge to decide when to leave that plant. Hence, in...
Article
Full-text available
Plant species that coexist and share pollinators may experience inter-specific competition for pollinator service or interference of improper pollen. To avoid the latter, plant species may use different areas of the pollinators´ body to deposit their pollen, either by different floral architectures or by different floral lengths. We evaluate here t...
Chapter
Full-text available
Darwin foi o primeiro a propor que caracteres florais evoluem como adaptações aos polinizadores. Em seus trabalhos utilizou orquídeas como alguns dos principais exemplos para ilustrar a teoria da evolução através da seleção natural. Contudo, apenas recentemente muitas das hipóteses adaptativas têm sido testadas experimentalmente quantificando-se a...
Article
Full-text available
Abstract Over the years, selection can vary in intensity and direction. Selection on traits related to the mechanical fit with pollinators is expected to vary according to changes in pollinator assemblage. Provided that pollinators do not change over time selection on traits related to attraction, such as floral fragrance, is expected to be mainly...
Article
Full-text available
Some species of long-spurred orchids achieve pollination by a close association with long-tongued hawkmoths. Among them, several Habenaria species present specialized mechanisms, where pollination success depends on the attachment of pollinaria onto the heads of hawkmoths with very long proboscises. However, in the Neotropical region such moths are...
Article
Because pollinators are unable to directly assess the amount of rewards offered by flowers, they rely on the information provided by advertising floral traits. Thus, having a lower intra-individual correlation between signal and reward (signal accuracy) than other plants in the population provides the opportunity to reduce investment in rewards and...
Article
Full-text available
By mimicking shape and female mating pheromones, flowers of sexually deceptive orchids attract sexually excited males which pollinate them while trying to copulate. Although many studies have demonstrated the crucial importance of odour signals in these systems, most flowers pollinated by pseudocopulation resemble, at least superficially, an insect...
Article
Full-text available
We studied gland morphology, anatomy and the chemical composition of the floral fragrance in the sweat bee-pollinated orchid Cyclopogon elatus. This is apparently the first such analysis for any Cyclopogon species, and one of very few studies in which both odour and osmophore are characterised in a nectar-rewarding orchid. Structures responsible fo...
Article
Full-text available
Abundant, many-flowered plants represent reliable and rich food sources for animal pollinators, and may even sustain guilds of specialized pollinators. Contrastingly, rare plants need alternative strategies to ensure pollinators' visitation and faithfulness. Flower mimicry, i.e. the sharing of a similar flower colour and display pattern by differen...
Article
Full-text available
Summary 1. Pollinator-mediated selection on traits associated with mechanical fit and attraction of pollinators were investigated through both sexual functions in Cyclopogon elatus (Sw.) Schlechter (Orchidaceae). 2. Only halictid bees, principally Augochlora nausicaa , were observed as pollinators. The pollinarium becomes attached to the ventral su...
Article
Full-text available
The attraction of male pollinating insects by sexual deception is known for several orchids from the Mediterranean, Australia, South Africa and South America. The sexual delusion may be so enticing in some species that it elicits males to attempt copulation with insect-like structures of the labellum. Pollination by such a pseudocopulation mechanis...

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Projects

Project (1)
Archived project
To write a book in Portuguese aimed to be the a complete reference to introduce the field of pollination biology.