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Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
Ecological Succession02:17

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
Ecological Disturbance02:26

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...

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Related Experiment Video

Updated: Jul 5, 2026

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)
12:26

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)

Published on: October 11, 2016

A dispersal-constrained habitat suitability model for predicting invasion of alpine vegetation.

Nicholas S G Williams1, Amy K Hahs, John W Morgan

  • 1Australian Research Centre for Urban Ecology, Royal Botanic Gardens, Melbourne, c/o School of Botany, University of Melbourne, Victoria 3010, Australia. nsw@unimelb.edu.au

Ecological Applications : a Publication of the Ecological Society of America
|May 21, 2008
PubMed
Summary
This summary is machine-generated.

Predicting invasive species spread is crucial for control. A new habitat suitability model accurately identified high-risk areas for orange hawkweed (Hieracium aurantiacum) in Australian alpine regions, aiding future monitoring efforts.

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Computer Vision-Based Biomass Estimation for Invasive Plants
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Computer Vision-Based Biomass Estimation for Invasive Plants

Published on: February 9, 2024

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Last Updated: Jul 5, 2026

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)
12:26

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)

Published on: October 11, 2016

Computer Vision-Based Biomass Estimation for Invasive Plants
08:47

Computer Vision-Based Biomass Estimation for Invasive Plants

Published on: February 9, 2024

Area of Science:

  • Ecology
  • Invasive Species Management
  • Predictive Modeling

Background:

  • Alpine ecosystems face increasing threats from invasive species due to climate change and human activity.
  • Early detection and control of exotic species like orange hawkweed (Hieracium aurantiacum) are vital for preserving native biodiversity.
  • Predictive tools are needed to anticipate and manage potential biological invasions in vulnerable environments.

Purpose of the Study:

  • To develop and evaluate a spatially explicit model for predicting the spread of orange hawkweed (Hieracium aurantiacum) in Australian alpine areas.
  • To identify high-risk zones for establishment based on habitat suitability and dispersal patterns.
  • To enhance the capacity for early detection and targeted monitoring of invasive species.

Main Methods:

  • Development of an expert-based, dispersal-constrained habitat suitability model.
  • Integration of habitat suitability index (disturbance, wetness, vegetation) with a phenomenological dispersal kernel (wind, dispersal distances).
  • Field validation of model-generated risk maps and time-step evaluation using known population data (AUC = 0.855 +/- 0.035).

Main Results:

  • The model identified high suitability for orange hawkweed establishment southeast of existing populations.
  • Native tussock grasslands and disturbed areas were predicted as highly suitable habitats.
  • Model evaluation demonstrated strong predictive power, accurately assigning high suitability to areas of post-2003 establishment.

Conclusions:

  • The developed model shows significant potential for predicting invasive species spread in alpine environments.
  • It can improve the efficiency of detecting new invasive populations and prioritizing monitoring efforts.
  • This tool is essential for proactive management of biological invasions in Australian alpine regions.