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Patterns of flow, leaf litter and shredder abundance in a tropical stream
Wootton, Allen ; Pearson, Richard G. (coaut.) ; Boyero, Luz (coaut.) ;
Contenido en: Hydrobiologia Vol. 826, no. 1 (January 2019), p. 353-365 ISSN: 1573-5117
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Resumen en: Inglés |
Resumen en inglés

The seasonal dynamics of leaf litter and associated consumers (“shredders”) in tropical streams are not well documented. We investigated the occurrence of litter (density and age composition) and shredders through late dry, wet and early dry seasons in an Australian rainforest stream. Leaf litter packs of varying density and leaf age covered most of the stream bed in the late dry season, but a one-in-one-year flood removed a substantial proportion of the sparse packs and much of the intermediate-aged litter, with green litter becoming more prevalent. Shredder abundances declined accordingly, but recovery was rapid, demonstrating substantial resilience to the disturbance. In a 36-day field experiment using fine- and coarse-mesh bags, green litter was decomposed more rapidly than intermediate and aged litter by both microbes and shredders, an unexpected and important result, given the abundance of green litter in the study stream. The resilience of shredders to moderate flood, their ability to process green leaves and their continued presence across seasons contribute to seasonal consistency in detrital-based food webs in the study stream except, perhaps, after extreme floods. This study demonstrates the need to consider the temporal changes in litter composition and decomposition in determining the nature of trophic processes in streams.

Ecological niches and geographic distributions / A. Townsend Peterson, Jorge Soberón, Richard G. Pearson, Roberto P. Anderson, Enrique Martínez Meyer, Miguel Nakamura, Miguel Bastos Araújo
Peterson, A. Townsend (1964-) ; Soberón, Jorge (coaut.) ; Pearson, Richard G. (coaut.) ; Anderson, Robert P. (coaut.) ; Martínez Meyer, Enrique (coaut.) ; Nakamura, Miguel (coaut.) ; Bastos Araújo, Miguel (coaut.) ;
Princeton, New Jersey : Princeton University Press , 2011
Clasificación: 574.5247 / E2
Bibliotecas: Campeche , Tapachula
SIBE Campeche
ECO040004798 (Disponible)
Disponibles para prestamo: 1
SIBE Tapachula
ECO020012979 (Disponible) , ECO020012502 (Disponible)
Disponibles para prestamo: 2
Índice | Resumen en: Inglés |
Resumen en inglés

This book provides a first synthetic view of an emerging area of ecology and biogeography, linking individual- and population-level processes to geographic distributions and biodiversity patterns. Problems in evolutionary ecology, macroecology, and biogeography are illuminated by this integrative view. The book focuses on correlative approaches known as ecological niche modeling, species distribution modeling, or habitat suitability modeling, which use associations between known occurrences of species and environmental variables to identify environmental conditions under which populations can be maintained. The spatial distribution of environments suitable for the species can then be estimated: a potential distribution for the species. This approach has broad applicability to ecology, evolution, biogeography, and conservation biology, as well as to understanding the geographic potential of invasive species and infectious diseases, and the biological implications of climate change.


1. Introduction
This Volume
Part I
2. Concepts of Niches
Major Themes in Niche Concepts
Grinnellian and Eltonian Niches
Estimating Grinnellian Niches: Practicalities
3. Niches and Geographic Distributions
Relations between Environmental and Geographic Spaces
The Ecological Equations
The BAM Diagram: A Thinking Framework
Ecological Niches and Geographic Distributions
Estimating Geographic Areas and Ecological Niches
Part II
4. Niches and Distributions in Practice: Overview
General Principles
Steps to Building Niche Models
5. Species’ Occurrence Data
Types of Occurrence Data
Occurrence Data Content and Availability
6. Environmental Data
Species-Environment Relationships
Environmental Data for Ecological Niche Modeling
Environmental Data in Practice
7. Modeling Ecological Niches
What Is Being Estimated?
Modeling Algorithms
Model Calibration
Model Complexity and Overfi tting
Study Region Extent and Resolution Revisited
Model Extrapolation and Transferability
Differences among Methods and Selection of “Best” Models
Characterizing Ecological Niches
8. From Niches to Distributions
Potential Distributional Areas
Nonequilibrium Distributions
Detecting and Processing Nonequilibrium Distributions
9: Evaluating Model Performance and Signifi cance
Presences, Absences, and Errors
Calibration and Evaluation Datasets
Overfi tting, Performance, Signifi cance, and Evaluation Space
Selection of Evaluation Data
Evaluation of Performance
Assessing Model Signifi cance
Future Directions

Part III
10. Introduction to Applications
11. Discovering Biodiversity
Discovering Populations
Discovering Species Limits
Discovering Unknown Species
Connection to Theory
Practical Considerations
Review of Applications
12. Conservation Planning and Climate Change Effects
Connection to Theory
Practical Considerations
Review of Applications
13. Species’ Invasions
Connection to Theory
Practical Considerations
Review of Applications
Caveats and Limitations
Future Directions and Challenges
14. The Geography of Disease Transmission
Connection to Theory
Practical Considerations
Review of Applications
Caveats and Limitations
Future Directions and Challenges
15. Linking Niches with Evolutionary Processes
Changes in the Available Environment
Niche Conservatism
Tests of Conservatism
Learning More about Ecological Niche Evolution
Future Directions and Challenges
16. Conclusions
Appendix A: Glossary of Symbols Used
Appendix B: Set Theory for G- and E-Space