A5014636396- Ecology and Vegetation Dynamics Studies
- Fire effects on ecosystems
- Plant and animal studies
- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Species Distribution and Climate Change
- Botany and Plant Ecology Studies
- Conservation, Biodiversity, and Resource Management
- Forest Biomass Utilization and Management
- Forest Management and Policy
- African Botany and Ecology Studies
- Seedling growth and survival studies
- Coastal wetland ecosystem dynamics
- Lichen and fungal ecology
- Bryophyte Studies and Records
- Amphibian and Reptile Biology
- Plant Parasitism and Resistance
- Infectious Diseases and Mycology
- Forest Ecology and Biodiversity Studies
- Plant Pathogens and Resistance
- Fern and Epiphyte Biology
- Insect-Plant Interactions and Control
- Insect and Arachnid Ecology and Behavior
- Soil Carbon and Nitrogen Dynamics
University of Denver
2017-2024
Universidad César Vallejo
2024
Tetbury Hospital
2021
Institut National de Recherche et de Sécurité
2019
Colorado State University
2006-2017
Cary Institute of Ecosystem Studies
2004-2007
Cornell University
1999-2006
Justus-Liebig-Universität Gießen
1964
Summary Climate is widely assumed to influence physiological and demographic processes in trees, hence forest composition, biomass range limits. Growth trees an important barometer of climate change impacts on forests as growth highly correlated with other including tree mortality fecundity. We investigated the main drivers diameter for five common species occurring Rocky Mountains western United States using nonlinear regression methods. quantified at individual level from core samples...
Summary Intact, closed canopied forests appear highly resistant to exotic plant invasions, but there are few experimental studies of this observation. To test issue and explore the conditions that foster resistance, we experimentally added Norway maple ( Acer platanoides L.) seeds intact for 3 years monitored emergence, survivorship height growth 5 years. Seed additions (250 −1 m 2 ) were replicated in situ combinations light (deep shade vs. small gaps), soil fertility (NO pH), variation...
Summary 1. The study of invasiveness typically emphasizes early successional life‐history traits in exotic plants, which enable the capture high resources disturbed environments and rapid growth. A key issue invasion dynamics is whether such behaviours come at expense as low‐light survivorship, allow species to become more dominant later succession. 2. We used maximum‐likelihood analysis compare growth survivorship two trees, Ailanthus altissima Acer platanoides , with nine native tree...
Summary Seed production by Picea engelmannii was monitored at 13 sites distributed across a ˜670 m elevation gradient for 40 years. Time series of annual seed output investigated evidence masting behaviour and trends in abundance over time. We used regression models likelihood framework to examine climate effects on critical periods the species' reproductive cycle. rigorously evaluated performance two gridded data sets, PRISM TopoWx, before using associated variables as predictors models....
Mountains have a long history in the study of diversity. Like macroscopic taxa, soil microbes are hypothesized to be strongly structured by montane gradients, and recently there has been important progress understanding how shaped these conditions. Here, we summarize this literature synthesize patterns microbial diversity on mountains. Unlike flora fauna that often display mid-elevation peak diversity, found decline (34% time) or no trend (33%) total with increasing elevation. Diversity...
Abstract Aim We examined relationships between climate–disturbance gradients and patterns of vegetation zonation ecotones on a subtropical mountain range. Location The study was conducted the windward slopes Cordillera Central, Dominican Republic, where cloud forest appears to shift in narrow ecotone monodominant Pinus occidentalis . Methods Climate, disturbance data were collected over elevation range 1100–3100 m 50 paired plots along ecotone. Aerial photographs georeferenced...
Life-history traits of invasive exotic plants are typically considered to be exceptional vis-à-vis native species. In particular, hyper-fecundity and long range dispersal regarded as traits, but direct comparisons with species needed identify the life-history stages behind invasiveness. Until recently, this task was particularly problematic in forests tree fecundity were difficult characterize closed stands. We used inverse modelling parameterize fecundity, seed seedling dispersion functions...
Gradual changes in vegetation structure and composition are expected to result from continuous environmental change with increasing elevation on mountains. Hence, the occurrence of abrupt or discrete ecotones patterns is intriguing may suggest key controls community assembly montane forests. We review tropical forest (TMF) zonation focusing a case study Cordillera Central, Hispaniola where striking discontinuity occurs consistently at ∼2000 m elevation, cloud below monodominant pine above....
Abstract: Disturbance is a central process in forest dynamics, yet the role of natural disturbance tropical montane forests (TMFs) has not been systematically addressed. We posit that TMFs wider than commonly acknowledged and its effects are distinctive because: (1) often have very low rates productivity due to resources, so recovery from may be slow, (2) marked environmental heterogeneity which interacts with disturbance, (3) large percentage regularly exposed high energy windstorms...
1. Aneura maxima (Schiffn.) Steph.Contributors. G. Gospodinov and R. NatchevaBulgaria. Sofia Province, Ihtiman Sredna Gora Mts, NW of Gabra village, near Chukurovo coal mine, 23.603208°E, 42.548586...
ABSTRACT Interest in tropical secondary forests has grown as large areas of agriculture have been abandoned recent decades; yet, there are few long‐term studies post‐agriculture vegetation recovery the tropics. In this study, we compared structure and floristic composition old‐growth 40‐year‐old riparian Cordillera Central, Dominican Republic. Canopy height stem density woody plants were similar between forest types, but basal area trees was 27 percent lower forests. Introduced tree species...
Abstract Although closed‐canopy forests are characterized by low‐light availability and slow population dynamics, many under threat from non‐native, invasive woody species that combine high colonization ability fast growth potential with survival. This ‘superinvader’ phenotype contravenes expected trade‐offs predicted successional niche theory, posing a challenge to both invasion forest succession theory. We propose parsimonious conceptual model based on the whole‐plant light compensation...
1 Effects of invasive species on ecosystem processes are often thought to underlie the effects invaders community dynamics. Specifically, positive feedbacks in which alter function ways that favour their own growth have been suggested as an important mechanism contributing success invasion. 2 In this study, we analysed impacts exotic tree Acer platanoides survival and conspecific native seedlings, explored whether these can be explained by invader. Seedlings platanoides, saccharum, Fraxinus...
Abstract: We examined stand dynamics and biomass along an altitudinal gradient in a tropical montane forest (TMF) the disturbance-prone Cordillera Central, Dominican Republic. tested general hypothesis that chronic disturbance by fire, wind, floods landslides results landscape of relatively low above-ground with high rates mortality, recruitment growth as compared other TMFs. also expected to decrease altitude part due declines increased losses from mortality increasing altitude. resurveyed...
Abstract: Tropical tropical montane cloud forests (TMCFs) cover a small portion of the Earth, yet they are significant biodiversity hotspots and centres endemism, provide important hydrological biogeochemical functions that affect human livelihoods. Given their fundamental sensitivity to climate, TMCFs also serve as an early warning system for climate change impacts. This paper outlines new international initiative, CloudNet, aims promote integrated research across TMCFs, introduces special...
Abstract Aim The rate and magnitude of climate‐induced tree range shifts may be influenced by range‐wide variation in recruitment, which acts as a bottleneck dynamics. Here, we compare predictions made using standard species distribution models (SDMs) an integrated metamodelling approach that assimilates data on adult occurrence, seedling recruitment dynamics, survival under both current future climate, evaluate the degree to information provided can improve Location interior west region...
Fire history was reconstructed from fire-scarred individuals of the endemic pine (Pinus occidentalis) along climatic gradients in Cordillera Central, Dominican Republic. We analysed variation fire frequency by climate, elevation and aspect (windward leeward central massif). A high correspondence between known fires fire-scar chronologies indicates that primary rings this species are annual. Evidence found for 41 years since 1727 A.D.; 28 were landscape-scale fires, nine which exceptionally...
Hurricanes are intense, frequent disturbances of Caribbean ecosystems and important agents in structuring the region's ecological patterns processes. The rugged topography diverse vegetation tropical montane forests interact with hurricane forces to create complex disturbance patterns. In this study, we used a 158-yr historical database tracks calculate fine-scale return intervals across Caribbean, Landsat imagery field inventory reconstruct wind rain from Hurricane Georges Cordillera...