Ecological Impacts

Jaksić, Fabián M.; Castro, Sergio A.

doi:10.1007/978-3-030-56379-0_7

Cited by 2 publications

(2 citation statements)

References 127 publications

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“…All biological invasions start with introduction, which is defined as entry of a foreign species into a novel ecosystem via human action (Jaksic & Castro, 2021 ; Richardson et al., 2000 ). Recently introduced populations often have low population density (Geburzi & McCarthy, 2018 ), which can translate into relatively high risk that a population can be extinguished by phenomena including but not limited to anthropogenic influences (e.g., Forseth et al., 2017 ; Frick et al., 2020 ; Matthies et al., 2004 ), disease (e.g., Trathan et al., 2015 ), and natural disasters (e.g., Ameca y Juárez et al., 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Invasive freshwater snails are less sensitive to population density than native conspecifics

Lewis Najev,

Neiman

2024

Ecology and Evolution

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Understanding how and why some species or lineages become invasive is critically important for effectively predicting and mitigating biological invasions. Here, we address an important unanswered question in invasion biology: do key life‐history traits of invasive versus native lineages within a species differ in response to key environmental stressors? We focus on the environmental factor of population density, which is a fundamental characteristic of all populations, and investigate how changes in density affect native versus invasive Potamopyrgus antipodarum (New Zealand mudsnail). P. antipodarum has invaded 39 countries and detrimentally affects invaded environments. Previous studies of native and invasive populations and from laboratory experiments have demonstrated that growth and reproduction of P. antipodarum is sensitive to population density, though whether and how this sensitivity varies across native versus invasive lineages remains uncharacterized. We quantified individual growth rate and reproduction in P. antipodarum from multiple distinct native and invasive lineages across three different population density treatments. The growth of native but not invasive lineages decreased as density increased. There was no differential effect of density treatment on embryo production of invasive versus native snails, but a significantly higher proportion of snails were reproductive in high density compared to intermediate density for invasive lineages. In native lineages, there were no significant differences in the relative frequency of reproductive snails across density treatments. While the extent to which these results from our laboratory study can be extrapolated to the more complex natural world remain unclear, our findings are consistent with a scenario where differential sensitivity to population density could help explain why some lineages become successful invaders. Our findings also align with previous studies that show that invasive P. antipodarum lineages exhibit a relatively wide range of tolerance to environmental stressors.

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Section: Introductionmentioning

confidence: 99%

Invasive freshwater snails are less sensitive to population density than native conspecifics

Lewis Najev,

Neiman

2024

Ecology and Evolution

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“…The spatial reorganization of global biodiversity is one of the main processes that define the epoch that we currently live in, the Anthropocene [ 1 , 2 ]. The situation of freshwater fish assemblages is particularly worrying: They have high species richness all around the world [ 3 ] and are especially vulnerable to localized anthropic impact [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Covariation of taxonomic and functional facets of β-diversity in Chilean freshwater fish assemblages: Implications for current and future processes of biotic homogenization

et al. 2023

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The biodiversity of assemblages that experience the introduction and extinction of species may lead to responses in two important facets: The taxonomic and functional diversity. The way in which these facets are associated may reveal important implications and consequences for the conservation of those assemblages. Considering the critical situation of freshwater fishes in continental Chile (30° – 56° S), we analyzed how the taxonomic (TDβ) and functional (FDβ) facets of β-diversity, and their components of turnover and nestedness, are associated. We evaluated changes in β-diversity (ΔTDβ and ΔFDβ), turnover (ΔTDtur and ΔFDtur), and nestedness (ΔTDnes and ΔFDnes) in 20 fish assemblages from their historical (pre-European) to current composition. We also simulated future trends of these changes, assuming that native species with conservation issues would become extinct. Our results show that the fish assemblages studied are in a process of loss of β-diversity, both in taxonomic and functional facets (ΔTDβ = -3.9%; ΔFDβ = -30.4%); also, that these facets are positively correlated in the assemblages studied (r = 0.617; P < 0.05). Both components showed by loss in nestedness (ΔTDnes = -36.9%; ΔFDnes = -60.9%) but gain in turnover (ΔTDtur = 9.2%; ΔFDtur = 12.3%). The functional β-diversity decreased more than the taxonomic (ΔFDβ > ΔTDβ), which was caused chiefly by six exotic species of Salmonidae, whose geographical spread was wider and that at the same time shared several morpho-functional traits. Our forecasts, assuming an intensification in the extinction of Endangered and Vulnerable native species, indicate that the process of homogenization will continue, though at a lower rate. Our study shows that the freshwater ichthyofauna of continental Chile is undergoing biotic homogenization, and that this process involves the facets of taxonomic and functional β-diversity, which are show high correlation between historical and current compositions. Both facets show that process is influenced by nestedness, and while turnover contributes to differentiation (both taxonomic and functional), its importance is overshadowed by nestedness.

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Ecological Impacts

Cited by 2 publications

References 127 publications

Invasive freshwater snails are less sensitive to population density than native conspecifics

Invasive freshwater snails are less sensitive to population density than native conspecifics

Covariation of taxonomic and functional facets of β-diversity in Chilean freshwater fish assemblages: Implications for current and future processes of biotic homogenization

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