scholarly journals Investigation of the relationship between the PGI enzyme system and scarabs fitness response to temperature as a measure of environmental tolerance in invasive species

2014 ◽  
Author(s):  
Marie-Caroline Lefort ◽  
Samuel D. J. Brown ◽  
Stéphane Boyer ◽  
Susan SP Worner ◽  
Karen Armstrong
Keyword(s):  
Invasive Species ◽  
Enzyme System ◽  
Thermal Adaptation ◽  
Invasion Success ◽  
Relative Fitness ◽  
Metabolic Enzyme ◽  
Abiotic Factor ◽  
Cellulose Acetate Electrophoresis ◽  
Environmental Tolerance ◽  
Key Enzyme

In the field of invasion ecology, the determination of a species environmental tolerance, is a key parameter in the prediction of its potential distribution, particularly in the context of global warming. In poikilothermic species such as insects, temperature is often considered the most important abiotic factor that affects numerous life-history and fitness traits through its effect on metabolic rate. Therefore the response of an insect to challenging temperatures may provide key information as to its climatic and therefore spatial distribution. Variation in the phosphoglucose-6-isomerase (PGI) metabolic enzyme-system has been proposed in some insects to underlie their relative fitness, and is recognised as a key enzyme in their thermal adaptation. However, in this context it has not been considered as a potential mechanism contributing to a species invasive cability. The present study aimed to compare the thermal tolerance of an invasive scarab, Costelytra zealandica (White) with that of the closely related, and in part sympatrically occurring, congeneric non-invasive species C. brunneum (Broun), and to consider whether any correlation with particular PGI phenotypes was apparent. Third instar larvae of each species were exposed to one of three different temperatures (10, 15 and 20°C) over six weeks and their fitness (survival and growth rate) measured and PGI phenotyping performed via cellulose acetate electrophoresis. No relationship between PGI phenotypes and fitness was detected, suggesting that the PGI may not be contributing to the invasion success and pest status of C. zealandica.

scholarly journals Investigation of the relationship between the PGI enzyme system and scarabs fitness response to temperature as a measure of environmental tolerance in invasive species

2014 ◽  
Author(s):  
Marie-Caroline Lefort ◽  
Samuel D. J. Brown ◽  
Stéphane Boyer ◽  
Susan SP Worner ◽  
Karen Armstrong
Keyword(s):  
Invasive Species ◽  
Enzyme System ◽  
Thermal Adaptation ◽  
Invasion Success ◽  
Relative Fitness ◽  
Metabolic Enzyme ◽  
Abiotic Factor ◽  
Cellulose Acetate Electrophoresis ◽  
Environmental Tolerance ◽  
Key Enzyme

In the field of invasion ecology, the determination of a species environmental tolerance, is a key parameter in the prediction of its potential distribution, particularly in the context of global warming. In poikilothermic species such as insects, temperature is often considered the most important abiotic factor that affects numerous life-history and fitness traits through its effect on metabolic rate. Therefore the response of an insect to challenging temperatures may provide key information as to its climatic and therefore spatial distribution. Variation in the phosphoglucose-6-isomerase (PGI) metabolic enzyme-system has been proposed in some insects to underlie their relative fitness, and is recognised as a key enzyme in their thermal adaptation. However, in this context it has not been considered as a potential mechanism contributing to a species invasive cability. The present study aimed to compare the thermal tolerance of an invasive scarab, Costelytra zealandica (White) with that of the closely related, and in part sympatrically occurring, congeneric non-invasive species C. brunneum (Broun), and to consider whether any correlation with particular PGI phenotypes was apparent. Third instar larvae of each species were exposed to one of three different temperatures (10, 15 and 20°C) over six weeks and their fitness (survival and growth rate) measured and PGI phenotyping performed via cellulose acetate electrophoresis. No relationship between PGI phenotypes and fitness was detected, suggesting that the PGI may not be contributing to the invasion success and pest status of C. zealandica.

scholarly journals The PGI enzyme system and fitness response to temperature as a measure of environmental tolerance in an invasive species

PeerJ ◽  
2014 ◽  
Vol 2 ◽  
pp. e676 ◽  
Author(s):  
Marie-Caroline Lefort ◽  
Samuel Brown ◽  
Stéphane Boyer ◽  
Susan Worner ◽  
Karen Armstrong
Keyword(s):  
Invasive Species ◽  
Enzyme System ◽  
Environmental Tolerance ◽  
Response To Temperature

Social context alters retreat- and nest-site selection in a globally invasive gecko, Hemidactylus frenatus

2019 ◽  
Vol 129 (2) ◽  
pp. 388-397
Author(s):  
Benjamin J Muller ◽  
Robin M Andrews ◽  
Lin Schwarzkopf ◽  
David A Pike
Keyword(s):  
Invasive Species ◽  
Site Selection ◽  
Nest Site ◽  
Gravid Female ◽  
Nest Site Selection ◽  
Invasion Success ◽  
Ceramic Tiles ◽  
Nest Sites ◽  
Gravid Females ◽  
Hemidactylus Frenatus

Abstract Microhabitat orientation and structure and the presence of conspecifics may strongly influence the choice of habitat. We studied how these variables influence retreat- and nest-site selection in gravid females of a globally successful invasive species, the Asian house gecko (Hemidactylus frenatus). When provided with various substrates (vertical and horizontal ceramic tiles, vertical and horizontal plywood tiles, horizontal bark over leaf litter, vertical bark over a log, and sand) gravid female geckos preferred to retreat to, and nest in, materials with crevices commonly found in urban habitats. When housed alone, gravid females most frequently retreated to vertical ceramic tile or wooden crevices, and 66.7% nested in vertical ceramic tiles. When housed with two other conspecifics, gravid females most frequently retreated to vertical ceramic tiles, but selected a wider range of nest sites. Overall, gravid geckos housed alone typically nested in the same substrates that they used as diurnal retreats; when housed in groups, however, females oviposited in locations different from those they selected as retreats. Thus, H. frenatus females use a wider range of substrates when conspecifics are present. Invasion success in this species might be driven, in part, by preferences for retreat and nest substrates that are common in human-dominated habitats.

scholarly journals Native turncoats and indirect facilitation of species invasions

2018 ◽  
Vol 285 (1871) ◽  
pp. 20171936 ◽  
Author(s):  
Tobin D. Northfield ◽  
Susan G. W. Laurance ◽  
Margaret M. Mayfield ◽  
Dean R. Paini ◽  
William E. Snyder ◽  
...  
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Potential Role ◽  
Indirect Interactions ◽  
Invasion Success ◽  
Competitive Interactions ◽  
Species Invasion ◽  
Species Invasions ◽  
Indirect Facilitation

At local scales, native species can resist invasion by feeding on and competing with would-be invasive species. However, this relationship tends to break down or reverse at larger scales. Here, we consider the role of native species as indirect facilitators of invasion and their potential role in this diversity-driven ‘invasion paradox’. We coin the term ‘native turncoats’ to describe native facilitators of non-native species and identify eight ways they may indirectly facilitate species invasion. Some are commonly documented, while others, such as indirect interactions within competitive communities, are largely undocumented in an invasion context. Therefore, we use models to evaluate the likelihood that these competitive interactions influence invasions. We find that native turncoat effects increase with the number of resources and native species. Furthermore, our findings suggest the existence, abundance and effectiveness of native turncoats in a community could greatly influence invasion success at large scales.

scholarly journals Plant-Soil Interactions of an Invasive Plant Species in its Native Range Help to Explain its Invasion Success Elsewhere

2021 ◽  
Author(s):  
Anna Aldorfová ◽  
Věra Hanzelková ◽  
Lucie Drtinová ◽  
Hana Pánková ◽  
Tomáš Cajthaml ◽  
...  
Keyword(s):  
Invasive Species ◽  
Invasive Plant ◽  
Seedling Emergence ◽  
Invasion Success ◽  
Enemy Release ◽  
Native Range ◽  
Non Invasive ◽  
Secondary Range ◽  
Plant Soil ◽  
Root Shoot Ratio

Abstract Purpose: To compare plant-soil feedback (PSF) of invasive Cirsium vulgare and non-invasive C. oleraceum in their native range to test a hypothesis that the invasive species is more limited by specialized pathogens in the native range and/or able to benefit more from generalist mutualists, and thus may benefit more from loss of specialized soil biota in a secondary range.Methods: We assessed changes in soil nutrients and biota following soil conditioning by each species and compared performance of plants grown in self-conditioned and control soil, from which all, some or no biota was excluded. Results: The invasive species depleted more nutrients than the non-invasive species and coped better with altered nutrient levels. The invasive species had higher seedling emergence which benefited from presence of non-specific microbes. The invasive species biomass responded less positively to specialized (self-conditioned) microbiota and more negatively to specialized larger-sized biota compared to the non-specialized control biota, suggesting the species may benefit more from enemy release and suffer less from loss of specialized mutualists when introduced to a secondary range. The invasive species showed greater ability to decrease its root-shoot ratio in presence of harmful biota and thus reduce their negative effects on its performance.Conclusions: Our study highlights the utility of detailed PSF research in the native range of species for understanding the factors that regulate performance of invasive and non-invasive species in their native range, and for pinpointing the types of biota involved in their regulation and how this changes across the plants life cycle.

scholarly journals Genomic Analyses of Phenotypic Differences Between Native and Invasive Populations of Diffuse Knapweed (Centaurea diffusa)

2021 ◽  
Vol 8 ◽  
Author(s):  
Kathryn G. Turner ◽  
Kate L. Ostevik ◽  
Christopher J. Grassa ◽  
Loren H. Rieseberg
Keyword(s):  
Invasive Species ◽  
Draft Genome ◽  
Invasion Success ◽  
Leaf Width ◽  
Evolutionary Potential ◽  
Reduced Representation ◽  
Centaurea Diffusa ◽  
A Genome ◽  
Genotype By Sequencing ◽  
Diffuse Knapweed

Invasive species represent excellent opportunities to study the evolutionary potential of traits important to success in novel environments. Although some ecologically important traits have been identified in invasive species, little is typically known about the genetic mechanisms that underlie invasion success in non-model species. Here, we use a genome-wide association (GWAS) approach to identify the genetic basis of trait variation in the non-model, invasive, diffuse knapweed [Centaurea diffusa Lam. (Asteraceae)]. To assist with this analysis, we have assembled the first draft genome reference and fully annotated plastome assembly for this species, and one of the first from this large, weedy, genus, which is of major ecological and economic importance. We collected phenotype data from 372 individuals from four native and four invasive populations of C. diffusa grown in a common environment. Using these individuals, we produced reduced-representation genotype-by-sequencing (GBS) libraries and identified 7,058 SNPs. We identify two SNPs associated with leaf width in these populations, a trait which significantly varies between native and invasive populations. In this rosette forming species, increased leaf width is a major component of increased biomass, a common trait in invasive plants correlated with increased fitness. Finally, we use annotations from Arabidopsis thaliana to identify 98 candidate genes that are near the associated SNPs and highlight several good candidates for leaf width variation.

scholarly journals Exploring the role of life history traits and introduction effort in understanding invasion success in mammals: A case study of Barbary ground squirrels

2020 ◽  
Author(s):  
Annemarie van der Marel ◽  
Jane M. Waterman ◽  
Marta López-Darias
Keyword(s):  
Invasive Species ◽  
Life History ◽  
Life History Traits ◽  
Ground Squirrels ◽  
Invasion Success ◽  
Biodiversity And Ecosystem Function ◽  
Main Factors ◽  
Main Factor

AbstractInvasive species –species that have successfully overcome the barriers of transport, introduction, establishment, and spread– are a risk to biodiversity and ecosystem function. Introduction effort is one of the main factors attributed to invasion success, but life history traits are also important as they influence population growth. In this contribution, we first investigated life history traits of the Barbary ground squirrel, Atlantoxerus getulus, a species with a remarkably low introduction effort, and studied whether their exceptional invasion success is due to a very fast life history profile through a comparison of these traits to other successfully invaded mammals. We then examined whether number of founders and/or a fast life history influences invasion success of squirrels. We found that Barbary ground squirrels were on the fast end of the “fast-slow continuum”, but their life history is not the only contributing factor for their invasion success, as the life history profile is comparable to other invasive species that do not have such a low introduction effort. We also found that neither life history traits nor number of founders explained invasion success of introduced squirrels in general. These results contradict the concept that introduction effort is the main factor explaining invasion success, especially in squirrels. Instead, we argue that invasion success can be influenced by multiple aspects of the new habitat or the biology of the introduced species.

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