scholarly journals Geographic patterns of seed trait variation in an invasive species: how much can close populations differ?

Oecologia ◽  
2021 ◽  
Author(s):  
Erola Fenollosa ◽  
Laia Jené ◽  
Sergi Munné-Bosch
Keyword(s):  
Invasive Species ◽  
Seed Production ◽  
Anthropogenic Pressure ◽  
Seed Traits ◽  
Trait Variation ◽  
Interpopulation Variability ◽  
Seed Trait ◽  
Bioclimatic Variables ◽  
Human Density ◽  
Trait Variability

AbstractSeeds play a major role in plant species persistence and expansion, and therefore they are essential when modeling species dynamics. However, homogeneity in seed traits is generally assumed, underestimating intraspecific trait variability across the geographic space, which might bias species success models. The aim of this study was to evaluate the existence and consequences of interpopulation variability in seed traits of the invasive species Carpobrotus edulis at different geographical scales. We measured seed production, morphology, vigour and longevity of nine populations of C. edulis along the Catalan coast (NE Spain) from three differentiated zones with a human presence gradient. Geographic distances between populations were contrasted against individual and multivariate trait distances to explore trait variation along the territory, evaluating the role of bioclimatic variables and human density of the different zones. The analysis revealed high interpopulation variability that was not explained by geographic distance, as regardless of the little distance between some populations (< 0.5 km), significant differences were found in several seed traits. Seed production, germination, and persistence traits showed the strongest spatial variability up to 6000% of percent trait variability between populations, leading to differentiated C. edulis soil seed bank dynamics at small distances, which may demand differentiated strategies for a cost-effective species management. Seed trait variability was influenced by human density but also bioclimatic conditions, suggesting a potential impact of increased anthropogenic pressure and climate shifts. Geographic interpopulation trait variation should be included in ecological models and will be important for assessing species responses to environmental heterogeneity and change.

scholarly journals The role of aggression in range expansion and biological invasions

2014 ◽  
Vol 60 (3) ◽  
pp. 401-409 ◽  
Author(s):  
Sandra Hudina ◽  
Karlo Hock ◽  
Krešimir žganec
Keyword(s):  
Invasive Species ◽  
Range Expansion ◽  
Potential Role ◽  
Invasion Success ◽  
Invasion Process ◽  
High Population Density ◽  
Trait Variation ◽  
Expansion Range ◽  
Niche Competition

Abstract Traits that aid in the invasion process should exhibit a gradient across the expansion range in response to changing selection pressures. Aggression has been repeatedly associated with invasion success in many taxa, as it may help invaders to wrestle the resources from other species which enhances their success in a novel environment. However, aggression primarily allows individuals to overcome conspecific rivals, providing advantages in competition over resources. Agonistic prowess could therefore increase fitness at both ends of the expansion gradient. Here we review the role of aggression in range expansion of invasive species, and its potential role as a driver of range expansion. We analyze how these different mechanisms could affect trait variation in expanding and invasive populations. Specifically, we look at how aggression could help dilate the edges of a population through niche competition, as well as lead to exclusion from the center (i.e. areas of high population density) by the conspe-cifics. Both of these processes will result in a characteristic spatial distribution of phenotypes related to aggression that could provide insights into the ecological pressures and dynamics of expanding populations, potentially providing clues to their success as niche competitors and invasive species.

scholarly journals Propagule pressure and the establishment of emergent polyploid populations

2020 ◽  
Vol 127 (1) ◽  
pp. 1-5
Author(s):  
Donald A Levin
Keyword(s):  
Invasive Species ◽  
Seed Production ◽  
Propagule Pressure ◽  
Prime Factor ◽  
Demographic Stochasticity ◽  
Local Populations ◽  
Population Survival ◽  
Successful Colonization ◽  
Number Of Seeds ◽  
Diploid Populations

Abstract Background Whereas the incidence or rate of polyploid speciation in flowering plants is modest, the production of polyploid individuals within local populations is widespread. Explanations for this disparity primarily have focused on properties or interactions of polyploids that limit their persistence. Hypothesis The emergence of local polyploid populations within diploid populations is similar to the arrival of invasive species at new, suitable sites, with the exception that polyploids suffer interference from their progenitor(s). The most consistent predictor of successful colonization by invasive plants is propagule pressure, i.e. the number of seeds introduced. Therefore, insufficient propagule pressure, i.e. the formation of polyploid seeds within diploid populations, ostensibly is a prime factor limiting the establishment of newly emergent polyploids within local populations. Increasing propagule number reduces the effects of genetic, environmental and demographic stochasticity, which thwart population survival. As with invasive species, insufficient seed production within polyploid populations limits seed export, and thus reduces the chance of polyploid expansion. Conclusion The extent to which propagule pressure limits the establishment of local polyploid populations remains to be determined, because we know so little. The numbers of auto- or allopolyploid seed in diploid populations rarely have been ascertained, as have the numbers of newly emergent polyploid plants within diploid populations. Moreover, seed production by these polyploids has yet to be assessed.

scholarly journals Polyploidy as a Management Strategy for Invasive Species

2019 ◽  
Vol 29 (5) ◽  
pp. 554-558 ◽  
Author(s):  
Kenneth W. Leonhardt
Keyword(s):  
Invasive Species ◽  
Flow Cytometry ◽  
Seed Production ◽  
Guard Cell ◽  
Management Strategy ◽  
Ornamental Plants ◽  
Delonix Regia ◽  
Albizia Saman ◽  
Tulip Tree ◽  
Native Habitats

Most invasive species are prolific seed-producing landscape ornamental plants that have been introduced to non-native habitats with limited or no natural controls on their reproduction and spread. Techniques for converting prolific seed-producing landscape ornamentals into sterile or nearly sterile forms are available. Oryzalin and colchicine have been used to double chromosomes, resulting in autotetraploids with reduced fertility and potential parent plants of sterile triploids. Guard cell measurements and flow cytometry have been used to determine ploidy conversion and identify polyploids. Complete sterility has been achieved in three species of shower trees (Cassia sp.), and up to a 95% reduction in seed production has been achieved in royal poinciana (Delonix regia) and african tulip tree (Spathodea campanulata). Monkey pod (Albizia saman) crosses have produced triploid progeny to evaluate for sterility.

Intraspecific pod and seed trait variation of two herbaceous legume seeds in response to competing neighbours and nutrient resource abundance

2021 ◽  
Vol 111 ◽  
pp. 103741
Author(s):  
Temidayo Ayodeji Adeyemi ◽  
Alaba Oluwafunmilayo Jolaosho ◽  
Peter Aniwe Dele ◽  
Adetomiwa Tolulade Adekoya ◽  
Funmilayo Adeola Oloyede ◽  
...  
Keyword(s):  
Trait Variation ◽  
Resource Abundance ◽  
Seed Trait ◽  
Legume Seeds

Effects of invasive plant patch size and distance on the pollination and reproduction of native boreal plants

Botany ◽  
2016 ◽  
Vol 94 (12) ◽  
pp. 1151-1160 ◽  
Author(s):  
Katie V. Spellman ◽  
Christa P.H. Mulder ◽  
Matthew L. Carlson
Keyword(s):  
Invasive Species ◽  
Seed Production ◽  
Invasive Plants ◽  
Native Species ◽  
Patch Size ◽  
Invasive Plant ◽  
Native Plants ◽  
Invasion Process ◽  
Melilotus Albus ◽  
Boreal Plants

In pollinator-limited ecosystems in the earliest stages of the invasion process, the effects of invasive plants on the pollination and reproduction of co-flowering native plants may be particularly sensitive to the distance between native and non-native plants. Our study tests how the distance from invasive plant patches affects the pollination and reproduction of two native boreal shrubs. We established circular sites with plots of flowering Vaccinium vitis-idaea L. and Rhododendron groenlandicum (Oeder) Kron and Judd spanning from 1 to 40 m from the site center. In 2011 and 2012, we added flowering non-native Melilotus albus Medik. to the center of sites in small patches (40 individuals) or large patches (120 individuals) and left other sites as controls. In some cases, the effects of M. albus were uniform across the 40 m distance, such as the change in V. vitis-idaea seed production when large patches of M. albus were added. In other cases, relationships with distance were found, and changes in percent pollination or seed production occurred most rapidly over the first 10 m from the patch. Our data supports the hypothesis that the detectable impact an invasive species has on the pollination of native species is affected by the spatial scale over which it is evaluated.

scholarly journals Invasive Species and Maintaining Biodiversity in the Natural Areas – Rural and Urban – Subject to Strong Anthropogenic Pressure

2018 ◽  
Vol 19 (6) ◽  
pp. 14-23
Author(s):  
Beata Fortuna-Antoszkiewicz ◽  
Jan Łukaszkiewicz ◽  
Edyta Rosłon-Szeryńska ◽  
Czesław Wysocki ◽  
Piotr Wiśniewski
Keyword(s):  
Invasive Species ◽  
Anthropogenic Pressure ◽  
Natural Areas ◽  
Rural And Urban

scholarly journals Integration of remote sensing and bioclimatic data for prediction of invasive species distribution in data-poor regions: a review on challenges and opportunities

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Nurhussen Ahmed ◽  
Clement Atzberger ◽  
Worku Zewdie
Keyword(s):  
Remote Sensing ◽  
Invasive Species ◽  
Temporal Resolution ◽  
Species Distribution ◽  
Future Research ◽  
Remotely Sensed Data ◽  
Selection Of Variables ◽  
Bioclimatic Variables ◽  
Challenges And Opportunities ◽  
Selection Of

Abstract Prediction and modeling using integrated datasets and expertise from various disciplines greatly improve the management of invasive species. So far several attempts have been made to predict, handle, and mitigate invasive alien species impacts using specific efforts from various disciplines. Yet, the most persuasive approach is to better control its invasion and subsequent expansion by making use of cross-disciplinary knowledge and principles. However, the information in this regard is limited and experts from several disciplines have sometimes difficulties understanding well each other. In this respect, the focus of this review was to overview challenges and opportunities in integrating bioclimatic, remote sensing variables, and species distribution models (SDM) for predicting invasive species in data-poor regions. Google Scholar search engine was used to collect relevant papers, published between 2005–2020 (15 years), using keywords such as SDM, remote sensing of invasive species, and contribution of remote sensing in SDM, bioclimatic variables, invasive species distribution in data-poor regions, and invasive species distribution in Ethiopia. Information on the sole contribution of remote sensing and bioclimatic datasets for SDM, major challenges, and opportunities for integration of both datasets are systematically collected, analyzed, and discussed in table and figure formats. Several major challenges such as quality of remotely sensed data and its poor interpretation, inappropriate methods, poor selection of variables, and models were identified. Besides, the availability of Earth Observation (EO) data with high spatial and temporal resolution and their capacity to cover large and inaccessible areas at a reasonable cost, as well as progress in remote sensing data integration techniques and analysis are among the opportunities. Also, the impacts of important sensor characteristics such as spatial and temporal resolution are crucial for future research prospects. Similarly important are studies analyzing the impacts of interannual variability of vegetation and land use patterns on invasive SDM. Urgently needed are clearly defined working principles for the selection of variables and the most appropriate SDM.

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