Raymond L Tremblay

Raymond L Tremblay
University of Puerto Rico at Humacao | UPRH · Department of Biology

PhD

About

113
Publications
34,195
Reads
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2,551
Citations
Citations since 2016
37 Research Items
1056 Citations
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2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Introduction
I'm an Evolutionary Ecologist with interest in Population dynamics. As a quantitative biologist I have developed extensive skills as a Data Scientist. I have a wide interest in questions that attempts to explain evolutionary processes that result in cladogenesis through Natural Selection and Genetic Drift.
Additional affiliations
August 2018 - present
Escuela de Medicina San Juan Bautista
Position
  • Statistician
Description
  • My main activities is supporting Medical Students and Faculty in their data analysis and data visualization in varying research projects.
October 2016 - present
University of Puerto Rico at Humacao
Position
  • Senior Faculty Mentor
Description
  • Mentor of Junior Faculty for all areas on campus. The objective is to support young faculty in being more productive, go through the hurdles of the tenure track process with success and increase publication rates.
January 2015 - June 2016
University of Puerto Rico at Cayey
Position
  • Senior Mentor
Description
  • My activities at UPR-Cayey is to be a mentor to the junior Faculty. With the junior faculty I'm offering a "writing group" experience to promote efficient and effective time managment to improve publication outcome.
Education
January 1992 - May 1996
University of Puerto Rico at Rio Piedras
Field of study
  • Evolutionary Ecology
September 1987 - May 1991
Carleton University
Field of study
  • Ecology

Publications

Publications (113)
Article
Full-text available
Premise of research. Small populations are intrinsically more vulnerable to population decline and extinction. Such populations may be most susceptible when distributed on small islands, which suffer disproportionately more from human influences, both directly and indirectly. Nevertheless, small native populations that occur on multiple islands may...
Article
Full-text available
Aim Understanding the factors driving the diversity of alien and native species on islands is crucial for predicting the spread of alien species and for proposing management practices to protect the unique native biodiversity that often occurs in insular ecosystems. The main objective of this study was to evaluate whether native and alien plant spe...
Article
Population projection matrices are a common means for predicting short-and long-term population persistence for rare, threatened and endangered species. Data from such species can suffer from small sample sizes and consequently miss rare demographic events resulting in incomplete or biologically unrealistic life cycle trajec-tories. Matrices with m...
Article
Objectives To estimate the epidemiology of sarcoidosis in Puerto Rico. Methods Patients with a diagnosis of sarcoidosis between January 2015 and December 2018 were selected from the Puerto Rico Health Insurance Administration Administración de Seguros de Salud de Puerto Rico claims database. The International Classification of Diseases-Tenth Revis...
Cover Page
Full-text available
This list is the basis for a paper that we have submitted, "Beyond the various contrivances by which orchids are pollinated: global patterns in orchid pollination biology." Abstract: The Orchidaceae shows remarkable diversity in pollination strategies but how these strategies vary globally is not entirely clear. To identify regions and taxa that a...
Preprint
Full-text available
Puerto Rico has experienced multiple introductions of Psittaciformes which have established self-sustaining populations, and the White-winged parakeets (Brotogeris versicolurus) has been considered the most successful invasive psittacine species in the island. In this study, we evaluated their population size, calculated growth rates and estimated...
Presentation
Full-text available
Ecólogo, Estadístico y Profesor UPR en Humacao M uchos de los estudiantes que entran a las universidades en Puerto Rico no se gradúan. La Universidad de Puerto Rico, recinto de Cayey gradúa cerca de la mitad de los alumnos que se matriculan. Si piensa que es poco, sepa que en las univer-sidades privadas las tasas de graduación son muy inferiores a...
Article
Full-text available
High levels of within-individual variation (WIV) in reiterative components in plants such as leaves, flowers, and fruits have been shown to increase individual fitness by multiple mechanisms including mediating interactions with natural enemies. This relationship between WIV and fitness has been studied almost exclusively in plant systems. While an...
Article
Based on several regression specifications that control for a host of covariates, this article demonstrates that the quantity of undergraduate research experience was by far the most important determinant for increased graduation rates at a 100% Hispanic-serving institution. Our finding also shows a causal relationship confirmed by propensity score...
Preprint
Full-text available
We estimated population densities of the red-bellied racer (Alsophis rufiventris) on the Caribbean island of St. Eustatius in 2011, 2018 and 2019 to determine the likely influence of hurricanes Irma and Maria (September 2017), in addition to evaluating abiotic parameters which may be correlated with its presence. Surveys were conducted at seven sit...
Article
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This is a brief obituary for one of the most influential scientists in Orchidology and Neotropical Botany published in Orchid Research Newsletter #76 published out of Royal Botanic Gardens, Kew.
Article
Full-text available
Calaway H. Dodson has had a significant impact on the development of orchid biology and Neotropical botany. His academic history and what he has accomplished both in science and the academic lineage that he fostered is summarized
Preprint
Full-text available
Background: Sarcoidosis is a systemic granulomatous and inflammatory disorder with significant variability in ethnicity and geographical distribution. There is no descriptive data about the epidemiology of the disease among the geographically isolated Puerto Rican population. Objective: To estimate the incidence, prevalence, distribution, and healt...
Article
Full-text available
The long‐term fate of populations experiencing disequilibrium conditions with their environment will ultimately depend on how local colonization and extinction dynamics respond to abiotic conditions (e.g. temperature and rainfall), dispersal limitation and biotic interactions (e.g. competition, facilitation, or interactions with natural enemies). U...
Article
Full-text available
Soil microbial communities are an important component of biological diversity and terrestrial ecosystems which is responsible for processes such as decomposition, mineralization of nutrients, and accumulation of organic matter. One of the factors that provide information on the mechanisms regulating biodiversity is spatial scaling. We characterized...
Cover Page
Full-text available
News article about our paper "From the cage to the wild: introductions of Psittaciformes to Puerto Rico" authored by Gerardo E. Alvarado León from El Nuevo Día. https://www.researchgate.net/publication/328612723_From_the_cage_to_the_wild_introductions_of_Psittaciformes_to_Puerto_Rico
Book
Este libro es sobre la visualización y producción efectiva de gráficos. El énfasis es en el paquete de ggplot2, que está basado en el lenguaje de programación R. Contiene una enorme variedad de representaciones de datos con más de 200 ejemplos. La visualización ayuda a entender lo que pueden comunicar los datos. Además, ayuda a expandir el análisis...
Article
Full-text available
Introduced psittacine birds can become highly invasive. In this study, we assessed invasions of Psittaciformes in Puerto Rico. We reviewed the literature, public databases, citizen science records, and performed in situ population surveys across the island to determine the historical and current status and distribution of psittacine species. We use...
Data
Supplementary Materials S1-S5 S1: Puerto Rico psittacine species checklist and status S2: Psittacine species occurrence locations and counts S3: Puerto Rico Landcover classification scheme S4: Psittacine species sighted by local groups (LGs) in Puerto Rico S5: Distribution of Psittaciformes in Puerto Rico based on location records from Ebird (1960–...
Preprint
Full-text available
Puerto Rico has experienced multiple introductions of Psittaciformes which have established self-sustaining populations, and the white-winged parakeets (Brotogeris versicolurus) has been considered the most successful invasive psittacine species in the island. In this study, we evaluated their population size, calculated growth rates and estimated...
Article
Full-text available
Historical land use can have long term effects and vegetation recovery of original components may vary. The tropical myco-heterotrophic orchid, Wullschlaegelia calcarata, is known to be sensitive to past disturbance, being most abundant in minimally disturbed forests of Puerto Rico in the West Indies. But spatial patterns of abundance do not necess...
Preprint
Full-text available
Introduced psittacine birds can become highly invasive. In this study, we assessed invasions of Psittaciformes in Puerto Rico. We reviewed the literature, public databases, citizen science records, and performed in situ population surveys across the island to determine the historical and current status and distribution of psittacine species. We use...
Article
Full-text available
Kreft et al. (2008) presented a global analysis of factors relating to differences in species numbers among 488 island and 970 mainland floras. They tested the relationship between island characteristics (area, isolation, topography, climate and geology) and species richness using traditional and spatial models. They found that area was the stronge...
Article
Full-text available
Premise of research. Tropical epiphytes are susceptible to climatic changes, as evidenced by documented population declines, range contractions, and range shifts; however, physiological changes in individual plants may also be indicative of deteriorating climate conditions. Consequently, physiological analyses of tropical epiphytes whose natural ha...
Article
Full-text available
Biological invasions can have negative consequences for resident biota, particularly when disease-causing organisms are involved. Austropuccinia psidii , or guava rust, has rapidly spread through the tropics affecting both native and non-native Myrtaceae. In Puerto Rico, the rust has become common on Syzygium jambos , an invasive tree native to Sou...
Article
Full-text available
The level of invasion (number or proportion of invasive species) in a given area depends on features of the invaded community, propagule pressure, and climate. In this study, we assess the invasive flora of nine islands in the West Indies to identify invasion patterns and evaluate whether invasive species diversity is related to geographical, ecolo...
Article
Full-text available
The original version of the article unfortunately contained an error in Figure 1. The arrow pointing from the native weevil (Stethobaris polita) to the invasive ant (Solenopsis invicta) should be in reverse. Invasive ants attack native weevils, preventing them from feeding on flowers and ovipositing in fruits (see corrected Fig. 1). The caption of...
Article
Full-text available
Non-native species often acquire novel interspecific interactions, which are central to several hypotheses of invasion success, including biotic resistance and invasional meltdown. However, the outcome of these interactions is not often linked with the demographic evidence based on the full life cycle of the species. The Philippine Ground Orchid (S...
Article
Full-text available
Charles Elton proposed that high species diversity and low levels of disturbance provide a measure of biotic resistance against invasions by alien species. While there is some evidence for this hypothesis, there are numerous other factors associated with invasive species richness, and the strength of those relationships is often scale-dependent. Am...
Presentation
Full-text available
An orchid conservation partnership for southeastern Australia, Proceedings of 6th International Orchid Conservation Congress (IOCC6), 16-20 May 2016, Hong Kong, China, pp. 13. (2016)
Poster
Full-text available
Non-native species often acquire novel interspecific interactions, which are central to several hypotheses of invasion success, such as biotic resistance and invasional meltdown. However, the outcome of these interactions is not often linked with the demographic evidence based on the full life cycle of the species. The Philippine Ground Orchid (Spa...
Article
Full-text available
In this paper we describe the phenotypic variation and pollination ecology of the twig orchid epiphyte Rodriguezia granadensis. The species presents flower color polymorphism (pink to white), suggesting that different color forms might be pollinated by different pollinators. To evaluate this hypothesis, one hundred plants were monitored in the fiel...
Article
Movement has broad implications for many areas of biology, including evolution, community and population ecology. Movement is crucial in metapopulation ecology because it facilitates colonization and reduces the likelihood of local extinction via rescue effects. Most metapopulation modeling approaches describe connectivity using pair-wise Euclidean...
Article
Full-text available
Background: The current live vaccinia virus vaccine used in the prevention of smallpox is contraindicated for millions of immune-compromised individuals. Although vaccination with the current smallpox vaccine produces protective immunity, it might result in mild to serious health complications for some vaccinees. Thus, there is a critical need for...
Article
Full-text available
Background and aims: Evaluation of population projection matrices (PPMs) that are focused on asymptotically based properties of populations is a commonly used approach to evaluate projected dynamics of managed populations. Recently, a set of tools for evaluating the properties of transient dynamics has been expanded to evaluate PPMs and to conside...
Article
Full-text available
The metapopulation concept is widely established in population biology. It predicts that the likelihood of colonization of an empty patch is positively correlated with its connectivity, because colonizers from occupied patches will be more likely to reach an empty patch if they are closer to it. Another prediction is that the likelihood of extincti...
Article
Full-text available
Predicting population dynamics for rare species is of paramount importance in order to evaluate the likelihood of extinction and planning conservation strategies. However, evaluating and predicting population viability can be hindered from a lack of data. Rare species frequently have small populations, so estimates of vital rates are often very unc...
Article
Full-text available
The aim of this analysis was to identify strategies that will maximize efficiency and effectiveness in conservation planning. As many orchids are threatened with extinction for various reasons, our primary objective was to combine hotspots analyses with stochastic extinction modelling to highlight possible conservation priorities for Lepanthes spp....
Article
Full-text available
The distribution of orchids in the epiphytic or lithophytic environment is likely to result from the interactions with other plant species. We tested for associations between bryophyte cover and diversity and the densities of different demographic stages (seedlings and juveniles vs adults) of Lepanthes rupestris (Rock Babyboot Orchid), a riparian t...
Conference Paper
Full-text available
Background/Question/Methods Variation in movement has broad implications for evolutionary biology, community ecology and population dynamics. In metapopulation ecology, movement provides the means to promote the persistence of the metapopulation and local populations over time. Most metapopulation approaches quantify colonization and extinction d...
Article
Full-text available
Lepanthes caritensis is a small epiphytic orchid endemic to Puerto Rico. Although this species is very rare and demographic studies show that its numbers are declining, it is not protected under the United States Federal Endangered Species Act (ESA). Furthermore, questions remain regarding its distribution, population size and ecological interactio...
Article
Full-text available
Novel markers of fecal pollution in tropical waters are needed since conventional methods recommended for other geographical regions may not apply. To address this, the prevalence of thermotolerant coliforms, enterococci, coliphages, and enterophages was determined by culture methods across a watershed. Additionally, human-, chicken-, and cattle-sp...
Article
Full-text available
ABSTRACT: Lepanthes caritensis is a small epiphytic orchid endemic to Puerto Rico. Although this species is very rare and demographic studies show that its numbers are declining, it is not protected under the United States Federal Endangered Species Act (ESA). Furthermore, questions remain regarding its distribution, population size and ecological...
Article
Full-text available
Premise of the study: Biotic changes are an inevitable consequence of climate change. Epiphytes may be more susceptible to changes in climate variation, but data regarding responses to climate variability under field conditions are limited. We evaluated whether the abundance of demographic stages in the epiphytic orchid Lepanthes rupestris at the...
Conference Paper
Background/Question/Methods We present the progress and preliminary results of an educational project aim to facilitate eight undergraduate students to develop quantitative analysis (QA) and critical thinking (CT) skills, and to review community and population ecology concepts to learn how to be trained on habitat evaluation (of red-bellied racer...
Conference Paper
Full-text available
The ornamental plant-trade is a multi-billion dollar industry, and is a major source for biological invasions. Many exotic plants are known to cause negative economical, ecological, and environmental impacts around the world. Orchids are rarely perceived as invasive species, yet some species are succesful invaders (e.g. Oeceoclades maculata). Among...
Article
Full-text available
Patterns of variation and their fitness consequences are critical in revealing natural selection. One of the most variable groups of plants are the deception-pollinated orchids, pollinators of which are deceived in their search for a food reward. Negative frequency-dependent selection and disruptive selection have been suggested as the means by whi...
Article
Full-text available
Natural selection and genetic drift are the two processes that can lead to cladogenesis. Without a doubt the great diversity and floral adaptation to specific pollinators are likely consequences of natural selection. Detecting natural selection in the wild requires measuring fitness advantage for specific characters. However, few published orchid s...
Article
Full-text available
Deceit-pollinated orchid species show substantial variation in floral traits, which may be maintained by genetic drift or various forms of selection, or may reflect phenotypic plasticity. We explored how much plasticity occurs in both vegetative and floral traits of Tolumnia variegata (Oncidiinae, Orchidaceae) across two different light environment...
Article
Full-text available
Evolutionary models estimating phenotypic selection in character size usually assume that the character is invariant across reproductive bouts. We show that variation in the size of reproductive traits may be large over multiple events and can influence fitness in organisms where these traits are produced anew each season. With data from population...
Article
Full-text available
The challenge of conservation biology is to make models that predict population dynamics and have a high probability of accurately tracking population change (increase, decrease, constancy). In this study we tested whether the transition model is accurate enough to predict population persistence and size 13years down and whether after 13years popul...
Article
Full-text available
The distribution of the endangered epiphytic orchid Lepanthes eltoroensis on the bole of trees was investigated in the Yunque National Forest, Puerto Rico. Using circular statistics, we evaluated if there was preference for cardinal position on the bole of trees along two trails (Tradewinds and El Toro). In addition we tested if larger trees had la...
Conference Paper
Background/Question/Methods The distribution of orchids in the epiphytic or lithophytic environment is likely to result from a combination of factors including the interactions with other plant species. Here we tested for negative associations between bryophyte cover and early demography stages and positive associations of bryophyte cover on adul...