scholarly journals Analysis of propagule pressure and genetic diversity in the invasibility of a freshwater apex predator: the peacock bass (genus Cichla)

2014 ◽  
Vol 12 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Daniel C. Carvalho ◽  
Denise A. A. Oliveira ◽  
Iracilda Sampaio ◽  
Luciano B. Beheregaray
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Amazon Basin ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Invasion Success ◽  
Southeastern Brazil ◽  
Feeding Strategies ◽  
Apex Predator ◽  
Biological Variables

An important step in invasive biology is to assess biological variables that could be used to predict invasion success. The study of genetics, evolution, and interactions of invasive and native species in invaded ranges provides a unique opportunity to study processes in population genetics and the capability of a species' range expansion. Here, we used information from microsatellite DNA markers to test if genetic variation relates to propagule pressure in the successful invasion of an apex predator (the Amazonian cichlid Cichla) into Southeastern Brazilian River systems. Invasive populations of Cichla have negatively impacted many freshwater communities in Southeastern Brazil since the 1960s. Reduction of genetic variation was observed in all invasive populations for both Cichla kelberi (CK) and Cichla piquiti(CP). For instance, heterozygosity was lower in the invasive range when compared to native populations from the Amazon basin (CP HE= 0.179/0.44; CK HE= 0.258/0.536 respectively). Therefore, despite the successful invasion of Cichla in southeast Brazil, low genetic diversity was observed in the introduced populations. We suggest that a combination of factors, such as Cichla's reproductive and feeding strategies, the "evolutionary trap" effect and the biotic resistance hypothesis, overcome their depauperete genetic diversity, being key aspects in this apex predator invasion.

scholarly journals Genetic variation in native and farmed populations of Tambaqui (Colossoma macropomum) in the Brazilian Amazon: regional discrepancies in farming systems

2013 ◽  
Vol 85 (4) ◽  
pp. 1439-1447 ◽  
Author(s):  
Jonas Aguiar ◽  
Horacio Schneider ◽  
Fatima Gomes ◽  
Jeferson Carneiro ◽  
Simoni Santos ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Dna Sequences ◽  
Amazon Basin ◽  
Farming Systems ◽  
Wild Populations ◽  
The West ◽  
Colossoma Macropomum ◽  
Breeding Stock ◽  
History Of

The tambaqui, Colossoma macropomum, is the most popular fish species used for aquaculture in Brazil but there is no study comparing genetic variation among native and farmed populations of this species. In the present study, we analyzed DNA sequences of the mitochondrial DNA to evaluate the genetic diversity among two wild populations, a fry-producing breeding stock, and a sample of fish farm stocks, all from the region of Santarém, in the west of the Brazilian state of Pará. Similar levels of genetic diversity were found in all the samples and surprisingly the breeding stock showed expressive representation of the genetic diversity registered on wild populations. These results contrast considerably with those of the previous study of farmed stocks in the states of Amapá, Pará, Piauí, and Rondônia, which recorded only two haplotypes, indicating a long history of endogamy in the breeding stocks used to produce fry. The results of the two studies show two distinct scenarios of tambaqui farming in the Amazon basin, which must be better evaluated in order to guarantee the successful expansion of this activity in the region, and the rest of Brazil, given that the tambaqui and its hybrids are now farmed throughout the country.

scholarly journals Invasion genomics uncover contrasting scenarios of genetic diversity in a widespread marine invader

2021 ◽  
Vol 118 (51) ◽  
pp. e2116211118
Author(s):  
Cornelia Jaspers ◽  
Moritz Ehrlich ◽  
José Martin Pujolar ◽  
Sven Künzel ◽  
Till Bayer ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Propagule Pressure ◽  
Invasion Success ◽  
Invasion Dynamics ◽  
The Past ◽  
Marine Invasive Species ◽  
Successful Establishment ◽  
Low Levels ◽  
International Conventions ◽  
Dominant Paradigm

Invasion rates have increased in the past 100 y irrespective of international conventions. What characterizes a successful invasion event? And how does genetic diversity translate into invasion success? Employing a whole-genome perspective using one of the most successful marine invasive species world-wide as a model, we resolve temporal invasion dynamics during independent invasion events in Eurasia. We reveal complex regionally independent invasion histories including cases of recurrent translocations, time-limited translocations, and stepping-stone range expansions with severe bottlenecks within the same species. Irrespective of these different invasion dynamics, which lead to contrasting patterns of genetic diversity, all nonindigenous populations are similarly successful. This illustrates that genetic diversity, per se, is not necessarily the driving force behind invasion success. Other factors such as propagule pressure and repeated introductions are an important contribution to facilitate successful invasions. This calls into question the dominant paradigm of the genetic paradox of invasions, i.e., the successful establishment of nonindigenous populations with low levels of genetic diversity.

scholarly journals Genetically diverse populations spread faster in benign but not in challenging environments

2020 ◽  
Author(s):  
Mortier Frederik ◽  
Masier Stefano ◽  
Bonte Dries
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Invasion Success ◽  
General View ◽  
Diverse Populations ◽  
Spread Rate ◽  
Negative Effects ◽  
Population Spread ◽  
Inbred Populations

AbstractPopulation spread from a limited pool of founding propagules is at the basis of biological invasions. The size and genetic variation of these propagules eventually affect whether the invasion is successful or not. The inevitable bottleneck at introduction decreases genetic diversity, and therefore should affect population growth and spread. However, many heavily bottlenecked invasive populations have been successful in nature. These negative effects of a genetic bottleneck are typically considered to be relaxed in benign environments because of a release from stress. Despite its relevance to understand and predict invasions, empirical evidence on the role of genetic diversity in relation to habitat quality is largely lacking. We use the mite Tetranychus urticae Koch as a model to experimentally assess spread rate and the size of genetically depleted inbred populations and enriched mixed populations. This was assessed in replicated linear patch systems consisting of benign (bean), challenging (tomato) or a gradient (bean to tomato) habitat. We find that genetic diversity increased population spread rates in the benign but not in the challenging habitat. Additionally, variance in spread was consistently higher in genetically poor populations and highest in the challenging habitat. Our experiment challenges the general view that a bottleneck in genetic variation decreases invasion success in challenging, but not in benign environments.

scholarly journals Biotic resistance shapes the influence of propagule pressure on invasion success in bacterial communities

Ecology ◽  
2017 ◽  
Vol 98 (7) ◽  
pp. 1743-1749 ◽  
Author(s):  
Matt L. Jones ◽  
Josep Ramoneda ◽  
Damian W. Rivett ◽  
Thomas Bell
Keyword(s):  
Bacterial Communities ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Invasion Success

Invasion Success in Cogongrass (Imperata cylindrica): A Population Genetic Approach Exploring Genetic Diversity and Historical Introductions

2014 ◽  
Vol 7 (1) ◽  
pp. 59-75 ◽  
Author(s):  
Rima D. Lucardi ◽  
Lisa E. Wallace ◽  
Gary N. Ervin
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Biological Invasion ◽  
Propagule Pressure ◽  
Gulf Coast ◽  
The United States ◽  
Parent Material ◽  
Imperata Cylindrica ◽  
Invasion Success ◽  
Grass Species

AbstractPropagule pressure significantly contributes to and limits the potential success of a biological invasion, especially during transport, introduction, and establishment. Events such as multiple introductions of foreign parent material and gene flow among them can increase genetic diversity in founding populations, often leading to greater invasion success. We applied the tools and theory of population genetics to better understand the dynamics of successful biological invasion. The focal species, cogongrass, is a perennial invasive grass species significantly affecting the Gulf Coast and southeastern region of the United States. The literature indicates separate, allopatric introductions of material from East Asia (Philippines and Japan) into the U.S. states of Mississippi and Alabama. Molecular analysis of samples from those two states utilized amplified fragment length polymorphism (AFLP) markers on 388 individuals from 21 localities. We hypothesized that previously isolated lineages of cogongrass are present and crossing in the Southeast. We observed genetic variation within localities (0.013 ≤ heterozygosity (He) ≤ 0.051, mean = 0.028 ± 0.001) with significant and substantial population structure (FST= 0.534, P < 0.001). Population structure analyses detected two genetically defined and statistically supported populations, which appear to have experienced some admixture. The geographic distribution of those populations was consistent with the two-introduction scenario reported previously. These results are also consistent with contact in the invasive range of previously isolated lineages from the native range.

scholarly journals Biotic resistance and vegetative propagule pressure co-regulate the invasion success of a marine clonal macrophyte

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Elena Balestri ◽  
Flavia Vallerini ◽  
Virginia Menicagli ◽  
Sara Barnaba ◽  
Claudio Lardicci
Keyword(s):  
Biotic Resistance ◽  
Propagule Pressure ◽  
Invasion Success ◽  
Vegetative Propagule

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 Biotic Resistance of Native Communities and Alien Propagule Pressure are Consistent Predictors of Invasion Success During Grassland Establishment

2021 ◽  
Author(s):  
Sandra Liliana Rojas-Botero ◽  
Johannes Kollmann ◽  
Leonardo H. Teixeira
Keyword(s):  
Invasive Plants ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
N Fertilization ◽  
Invasion Success ◽  
Native Community ◽  
Environmental Fluctuation ◽  
Native Communities ◽  
Propagule Size ◽  
Key Driver

Abstract Invasive alien plants challenge ecosystems restoration. Thus, understanding factors determining the establishment of invasive plants is crucial to improve restoration outcomes. Some key drivers of invasibility of plant communities have been studied, but results are inconsistent, and combined effects have not been addressed. We investigated the contribution of three drivers of invasion success during early phases of restoration, i.e., biotic resistance, invasive propagule pressure, and environmental fluctuations.We compared the contribution of these drivers in a series of mesocosms experiments using designed grasslands as a model system, and Solidago gigantea as invasive model species. Two grassland communities were designed according to competitive trait hierarchies with different sowing patterns, reflecting variation in biotic resistance. We then manipulated invader propagule pressure and applied different scenarios of environmental fluctuation, i.e., flood, heat, and N fertilization. Alien biomass was considered as proxy for invasion success, while native biomass represented restoration success.There were consistent effects of biotic resistance to S. gigantea invasion via competitive trait hierarchies in the three experiments. Communities dominated by species with high-competition traits were more resistant regardless of environmental fluctuation. Clumped seeding of the native community reduced invasibility, whereas larger invasive propagule size increased invasion. The effects of environmental fluctuation were less consistent and context-dependent, thus playing a secondary role when compared to biological drivers of invasion. Restoration initiatives on grasslands impacted by invasive plants should consider biotic resistance of the restored community as a key driver and the importance of controlling further arrivals of invasive species during community assembly.

scholarly journals The interplay between propagule pressure, seed predation and ectomycorrhizal fungi in plant invasion

NeoBiota ◽  
2019 ◽  
Vol 42 ◽  
pp. 45-58
Author(s):  
Jaime Moyano ◽  
Mariana C. Chiuffo ◽  
Nahuel Policelli ◽  
Martin A. Nuñez ◽  
Mariano A. Rodriguez-Cabal
Keyword(s):  
Ectomycorrhizal Fungi ◽  
Seed Predation ◽  
Root Colonization ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Soil Samples ◽  
Invasion Success ◽  
Interactive Effects ◽  
Pine Plantation ◽  
Study Region

There are many hypotheses aiming to explain invasion success, but evaluating individual hypotheses in isolation may hinder our ability to understand why some species invade and others fail. Here we evaluate the interaction between propagule pressure, seed predation and missed mutualism in the invasion success of the pine, Pinusponderosa. We evaluated the independent and interactive effects of propagule pressure and seed predation at increasing distances from a pine plantation. Additionally, because pines are obligate mutualists with ectomycorrhizal fungi (EMF) and pine invasions fail in the absence of their EMF symbionts, we evaluated EMF availability through a growth chamber bioassay. In this bioassay we measured root colonization by EMF with soil samples collected from the different distances from the plantation. We found that propagule pressure overwhelms seed predation only at the edge of the pine plantation, while seed predation overcomes propagule pressure at 25 m and further distances from the plantation. We also found that EMF root colonization decreases with distance from the plantation. However, pine roots were colonized up to 200 m from the plantation, suggesting that EMF may not be hindering invasion, at least not on the scale of this experiment. Taken together our results demonstrate that seed predation may be limiting the invasion of P.ponderosa in the study region as propagule pressure only overcomes seed predation at the plantation edge. Here we provide evidence of how strong biotic resistance can suppress an invasion, regardless of the variation in propagule pressure and the availability of mutualists.

scholarly journals Dynamics of an experimental microbial invasion

2015 ◽  
Vol 112 (37) ◽  
pp. 11594-11599 ◽  
Author(s):  
Francisco Acosta ◽  
Richard M. Zamor ◽  
Fares Z. Najar ◽  
Bruce A. Roe ◽  
K. David Hambright
Keyword(s):  
Microbial Community ◽  
Environmental Changes ◽  
Biotic Resistance ◽  
Propagule Pressure ◽  
Microbial Community Composition ◽  
Invasion Success ◽  
Community Diversity ◽  
Species Invasions ◽  
Southern Us ◽  
Microbial Invasion

The ecological dynamics underlying species invasions have been a major focus of research in macroorganisms for the last five decades. However, we still know little about the processes behind invasion by unicellular organisms. To expand our knowledge of microbial invasions, we studied the roles of propagule pressure, nutrient supply, and biotic resistance in the invasion success of a freshwater invasive alga, Prymnesium parvum, using microcosms containing natural freshwater microbial assemblages. Microcosms were subjected to a factorial design with two levels of nutrient-induced diversity and three levels of propagule pressure, and incubated for 7 d, during which P. parvum densities and microbial community composition were tracked. Successful invasion occurred in microcosms receiving high propagule pressure whereas nutrients or community diversity played no role in invasion success. Invaded communities experienced distinctive changes in composition compared with communities where the invasion was unsuccessful. Successfully invaded microbial communities had an increased abundance of fungi and ciliates, and decreased abundances of diatoms and cercozoans. Many of these changes mirrored the microbial community changes detected during a natural P. parvum bloom in the source system. This role of propagule pressure is particularly relevant for P. parvum in the reservoir-dominated southern United States because this species can form large, sustained blooms that can generate intense propagule pressures for downstream sites. Human impact and global climate change are currently causing widespread environmental changes in most southern US freshwater systems that may facilitate P. parvum establishment and, when coupled with strong propagule pressure, could put many more systems at risk for invasion.

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