Emerging Alien Species and Their Invasion Processes—2nd Edition

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Plant Diversity".

Deadline for manuscript submissions: 15 April 2026 | Viewed by 1065

Special Issue Editor


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Guest Editor
Centre for Invasion Biology, School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg 3200, South Africa
Interests: biological invasions; conservation ecology; environmental sustainability research; exotic plants; protected area biodiversity management; South African biodiversity
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Special Issue Information

Dear Colleagues,

Invasions of alien species into ecosystems can have important ecological and economic consequences. Some estimates suggest that invasive species are the second greatest threat to biological diversity worldwide and cost billions of dollars economically. Although invasion processes and the intentional or unintentional anthropogenically supported establishment of biota in a new ecosystem have occurred for centuries, the relevance of invasion processes is still increasing, with the rapidly evolving functional connectivity, due to globalisation. Therefore, the numbers of alien species are increasing at an alarming rate globally.

Current trends suggest that predictive models can help the development of management strategies that match the rate change in the spread and associated impacts. Additionally, ecological approaches can provide helpful information on the relationship between alien invasions and biological responses; comparative research between invaders and closely related native species can reveal functional traits involved in the invasion success.

In this Special Issue, we invite the submission of contributions that address the emerging alien species’ issues in various ecosystems from natural resources conservation, social dimensions, management and control, including specific interactions, adaptation, patterns of introduction and expansion, responses of natural systems and their functions, and services, etc. Studies presenting case studies at different spatial scales—national regional, continental and global— are most appreciated if they are supported by reliable data sets and are underpinned by accurate scientific protocols.

Dr. Thabiso Michael Mokotjomela
Guest Editor

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Keywords

  • invasive species
  • ecological restoration
  • biodiversity conservation
  • ecosystem services
  • biological invasions
  • invasive species impacts
  • invasion resistance
  • community stability

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Published Papers (1 paper)

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Review

21 pages, 8814 KB  
Review
The Impact of Life History Traits and Defensive Abilities on the Invasiveness of Ulex europaeus L.
by Hisashi Kato-Noguchi and Midori Kato
Diversity 2025, 17(11), 805; https://doi.org/10.3390/d17110805 - 20 Nov 2025
Viewed by 800
Abstract
Ulex europaeus L. has been introduced into many countries as an ornamental and hedgerow plant, and it often escapes its intended location, establishing dense, feral thickets. These thickets threaten the structure and function of native flora and fauna in areas where the plant [...] Read more.
Ulex europaeus L. has been introduced into many countries as an ornamental and hedgerow plant, and it often escapes its intended location, establishing dense, feral thickets. These thickets threaten the structure and function of native flora and fauna in areas where the plant has been introduced. Because of its invasive nature, U. europaeus is considered one of the world’s 100 worst alien invasive species. It exhibits rapid growth, and high biomass accumulation with a high nitrogen fixation ability. Its flowering phenology depends on local conditions and population. It produces a large number of viable seeds and establishes extensive seed banks. These seeds remain viable for a long time due to physical dormancy. Ulex europaeus produces elaiosomes on the seed surface that are likely used solely for seed dispersal by ants. Ulex europaeus has a high level of genetic diversity due to its allohexaploid chromosome sets. This allows the plant to adapt to different habitats and tolerate various climate conditions. It can survive in areas with limited sunlight beneath tall plant canopies. Its shade tolerance surpasses that of other shrub species. Ulex europaeus produces several compounds, including quinolizidine alkaloids, monoterpenes, flavonoids, and cinnamic acid derivatives. These compounds play a role in defensive responses to biotic stressors, including pathogen infections, herbivorous insects, and neighboring plants competing for resources. These life history traits and defensive abilities may contribute to the expansion of U. europaeus populations into new habitats, enabling the plant to thrive as an invasive species. This is the first study to examine the invasiveness of U. europaeus in terms of its growth, reproduction, ability to adapt to different conditions, and defensive responses to biotic stressors. Full article
(This article belongs to the Special Issue Emerging Alien Species and Their Invasion Processes—2nd Edition)
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