Propagule pressure cannot always overcome biotic resistance: the role of density-dependent establishment in four invasive species

Weed Research ◽  
2016 ◽  
Vol 56 (3) ◽  
pp. 208-218 ◽  
Author(s):  
J N Barney ◽  
M W Ho ◽  
D Z Atwater
Keyword(s):  
Invasive Species ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Density Dependent

scholarly journals Relative roles of climatic suitability and anthropogenic influence in determining the pattern of spread in a global invader

2010 ◽  
Vol 108 (1) ◽  
pp. 220-225 ◽  
Author(s):  
Núria Roura-Pascual ◽  
Cang Hui ◽  
Takayoshi Ikeda ◽  
Gwénaël Leday ◽  
David M. Richardson ◽  
...  
Keyword(s):  
Invasive Species ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Distribution Patterns ◽  
Global Scale ◽  
Invasion Success ◽  
Climatic Suitability ◽  
Natural Ecosystems ◽  
Widespread Species ◽  
Human Modification

Because invasive species threaten the integrity of natural ecosystems, a major goal in ecology is to develop predictive models to determine which species may become widespread and where they may invade. Indeed, considerable progress has been made in understanding the factors that influence the local pattern of spread for specific invaders and the factors that are correlated with the number of introduced species that have become established in a given region. However, few studies have examined the relative importance of multiple drivers of invasion success for widespread species at global scales. Here, we use a dataset of >5,000 presence/absence records to examine the interplay between climatic suitability, biotic resistance by native taxa, human-aided dispersal, and human modification of habitats, in shaping the distribution of one of the world's most notorious invasive species, the Argentine ant (Linepithema humile). Climatic suitability and the extent of human modification of habitats are primarily responsible for the distribution of this global invader. However, we also found some evidence for biotic resistance by native communities. Somewhat surprisingly, and despite the often cited importance of propagule pressure as a crucial driver of invasions, metrics of the magnitude of international traded commodities among countries were not related to global distribution patterns. Together, our analyses on the global-scale distribution of this invasive species provide strong evidence for the interplay of biotic and abiotic determinants of spread and also highlight the challenges of limiting the spread and subsequent impact of highly invasive species.

scholarly journals Choosing exotic over the familiar taste: habitat-specific preferences of a malacophagous leech for freshwater snails as prey gastropod establishment?

2020 ◽  
Vol 6 (1) ◽  
pp. 121-136
Author(s):  
Pranesh Paul ◽  
Rupsha Karmakar ◽  
Gautam Aditya
Keyword(s):  
Invasive Species ◽  
Biotic Resistance ◽  
Prey Availability ◽  
Freshwater Ecosystems ◽  
Habitat Conditions ◽  
Gastropod Mollusc ◽  
Freshwater Gastropod ◽  
Indoplanorbis Exustus ◽  
Made In

The spread of freshwater invasive species through aquarium trade poses a threat to the ecosystem, economy and human health. The availability of the exotic freshwater gastropod mollusc, Planorbarius corneus (Linnaeus, 1758) (Gastropoda: Planorbidae), in pet shops in Kolkata, West Bengal, India, raises concern for its potential establishment as an invasive species. Assuming the role of the native predators as a potential biotic barrier for invasion, observations on the predation pattern of the malacophagous leech, Glossiphonia weberi (Blanchard, 1897) (Clitellata: Glossiphoniidae) against P. corneus was made in single as well as in combination with the native snail Indoplanorbis exustus (Deshayes, 1834) (Gastropoda: Planorbidae). Using varying size classes and densities of P. corneus, the predation potential of G. weberi was estimated after a 24 hour period. In another set of experiments, the predation of G. weberi against the snail P. corneus was observed in the presence of I. exustus under four different habitat conditions. The purpose was to justify - (1) the effect of conspecific and heterospecific conditions of the prey availability and (2) the effect of habitat complexity on the predatory efficacy of G. weberi. The results indicated that G. weberi consumed varied numbers of P. corneus, depending on the size and the densities of the prey and predator. Although the prey heterogeneity and complex habitats caused significant reduction of predation on both of the prey species, G. weberi significantly preferred P. corneus over I. exustus in open (P < 0.0001), macrophyte (P = 0.002) and pebbles and macrophyte containing habitats (P < 0.0001). Apparently, G. weberi preferred the exotic snail P. corneus in presence of alternative prey snail I. exustus, under different habitat conditions. Therefore, G. weberi may act as a significant biotic resistance against the colonization and establishment of P. corneus in the Indian context. However, further studies including the multiple prey and predators are required to ascertain the food web level impact of the exotic snail P. corneus in invaded freshwater ecosystems.

scholarly journals Role of propagule pressure in colonization success: disentangling the relative importance of demographic, genetic and habitat effects

2013 ◽  
Vol 26 (8) ◽  
pp. 1691-1699 ◽  
Author(s):  
R. A. Hufbauer ◽  
A. Rutschmann ◽  
B. Serrate ◽  
H. Vermeil de Conchard ◽  
B. Facon
Keyword(s):  
Propagule Pressure ◽  
Relative Importance ◽  
Colonization Success

scholarly journals Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Crustaceana ◽  
2017 ◽  
Vol 90 (4) ◽  
pp. 417-435 ◽  
Author(s):  
R. J. Houghton ◽  
C. Wood ◽  
X. Lambin
Keyword(s):  
Relative Size ◽  
Pacifastacus Leniusculus ◽  
Gut Contents ◽  
Size Distributions ◽  
Signal Crayfish ◽  
Density Dependent ◽  
Invasive Crayfish ◽  
The Relationship ◽  
Best Fit

The role of cannibalism in crayfish populations is not well understood, despite being a potentially key density-dependent process underpinning population dynamics. We studied the incidence of cannibalism in an introduced signal crayfish Pacifastacus leniusculus population in a Scottish lowland river in September 2014. Animals were sampled using six different sampling techniques simultaneously, revealing variable densities and size distributions across the site. Cannibalism prevalence was estimated by analysing the gut contents of crayfish >20 mm CL for the presence of crayfish fragments, which was found to be 20% of dissected individuals. When seeking evidence of relationships between the sizes of cannibals and ‘prey’, the density of conspecifics <56% the size of a dissected individual yielded the best fit. The relationship between cannibalism probability and crayfish size and density was equally well described by three different metrics of crayfish density. Cannibalism increased with crayfish size and density but did not vary according to sex. These results suggest that large P. leniusculus frequently cannibalize smaller (prey) conspecifics, and that the probability of cannibalism is dependent upon the relative size of cannibal-to-prey and the density of the smaller crayfish. We suggest that removing large individuals, as targeted by many traditional removal techniques, may lead to reduced cannibalism and therefore a compensatory increase in juvenile survival.

scholarly journals Plant invasions: merging the concepts of species invasiveness and community invasibility

2006 ◽  
Vol 30 (3) ◽  
pp. 409-431 ◽  
Author(s):  
David M. Richardson ◽  
Petr Pyšek
Keyword(s):  
Biotic Resistance ◽  
Propagule Pressure ◽  
Plant Invasions ◽  
Invasion Ecology ◽  
Natural Ecosystems ◽  
Long Distance ◽  
Fluctuating Resources ◽  
Species Invasiveness ◽  
Tens Rule ◽  
New Research

This paper considers key issues in plant invasion ecology, where findings published since 1990 have significantly improved our understanding of many aspects of invasions. The review focuses on vascular plants invading natural and semi-natural ecosystems, and on fundamental ecological issues relating to species invasiveness and community invasibility. Three big questions addressed by the SCOPE programme in the 1980s (which species invade; which habitats are invaded; and how can we manage invasions?) still underpin most work in invasion ecology. Some organizing and unifying themes in the field are organism-focused and relate to species invasiveness (the tens rule; the concept of residence time; taxonomic patterns and Darwin’s naturalization hypothesis; issues of phenotypic plasticity and rapid evolutionary change, including evolution of increased competitive ability hypothesis; the role of long-distance dispersal). Others are ecosystem-centred and deal with determinants of the invasibility of communities, habitats and regions (levels of invasion, invasibility and propagule pressure; the biotic resistance hypothesis and the links between diversity and invasibility; synergisms, mutualisms, and invasional meltdown). Some theories have taken an overarching approach to plant invasions by integrating the concepts of species invasiveness and community invasibility (a theory of seed plant invasiveness; fluctuating resources theory of invasibility). Concepts, hypotheses and theories reviewed here can be linked to the naturalization-invasion continuum concept, which relates invasion processes with a sequence of environmental and biotic barriers that an introduced species must negotiate to become casual, naturalized and invasive. New research tools and improved research links between invasion ecology and succession ecology, community ecology, conservation biology and weed science, respectively, have strengthened the conceptual pillars of invasion ecology.

scholarly journals The role of anglers in preventing the spread of aquatic invasive species in the Great Lakes region

2016 ◽  
Vol 42 (3) ◽  
pp. 703-707 ◽  
Author(s):  
Nancy A. Connelly ◽  
T. Bruce Lauber ◽  
Richard C. Stedman ◽  
Barbara A. Knuth
Keyword(s):  
Invasive Species ◽  
Great Lakes ◽  
Aquatic Invasive Species ◽  
Great Lakes Region

Role of salt sources in density-dependent flow

2009 ◽  
Vol 45 (5) ◽  
Author(s):  
Juan J. Hidalgo ◽  
Jesús Carrera ◽  
Agustín Medina
Keyword(s):  
Density Dependent ◽  
Dependent Flow ◽  
Density Dependent Flow

Biotic resistance to plant invasions.

2020 ◽  
pp. 177-191
Author(s):  
John D. Parker ◽  
◽  
John L. Devaney ◽  
Nathan P. Lemoine ◽  
◽  
...  
Keyword(s):  
Biotic Resistance ◽  
Propagule Pressure ◽  
Empirical Support ◽  
Plant Invasions ◽  
Plant Invaders ◽  
History Of Research ◽  
History Of ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
The Tropics

Biotic resistance to plant invasions takes many forms: consumption by native herbivores, competition with native plants and infection by native pathogens. But how often does biotic resistance prevent the damaging monocultures that typify the most problematic plant invaders, and how often is biotic resistance overwhelmed by the direct and indirect impacts of human activities? This chapter attempts to answer these questions, drawing on the long history of research into biotic resistance. We first briefly describe the major forms of biotic resistance to exotic plant invasions as an antecedent to other, more detailed chapters on competition, herbivory and pathogens. We then describe a new neutral model where variance in disturbance promotes invasions over the short term, but over longer timescales only propagule pressure drives invasions. These findings are a cautionary tale; pending increases in global trade and travel, particularly to the tropics, may provide the prerequisite disturbance and propagule pressure needed to ultimately stoke further invasions. Finally, we highlight case studies where invasions have been mitigated by restoration of biotic resistance from native herbivores and competitors. These studies provide strong empirical support that conservation of native biodiversity can be a nature-based solution to some invasions, although it remains to be seen if climate change will alter these effects over longer timescales.

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