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17 results for “marine invasive species”
Fig. 2 in Native species Maxvachonia chabaudi Mawson, 1972 (Nematoda: Cosmocercoidea) found in the invasive marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia
Fig. 2. Scanning electron micrographs of Maxvachonia chabaudi Mawson, 1972 from the marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia, male. A – anterior part of body (lateral ala arrowed), lateral view; B – cephalic end (amphid arrowed), apical view; C, G – posterior end of different individuals (white arrows showing precloacal papillae, black arrow showing lateral ala), lateral view; D – magnified image of precloacal papilla; E – magnified image of postcloacal papilla; F – magnified image of cloacal region (white arrow showing precloacal medio-ventral papilla, black arrows showing paracloacal papillae); H – tail (white arrows showing postcloacal papillae, black arrow showing phasmid), lateral view; I – magnified image of phasmid. Abbreviations: d – dorsal lip; g – tip of gubernaculum; i – inner flange of lips; v – ventrolateral lip.
Fig. 3 in Native species Maxvachonia chabaudi Mawson, 1972 (Nematoda: Cosmocercoidea) found in the invasive marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia
Fig. 3. Scanning electron micrographs of Maxvachonia chabaudi Mawson, 1972 from the marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia, female. A – anterior part of body (excretory pore and vulva arrowed), ventral view; B – magnified im- age of excretory pore; C – magnified image of vulva; D – cephalic end (amphids arrowed), apical view; E – egg (small nipple arrowed); F – tail, lateral view; G – magnified image of tail tip. Abbreviations: d – dorsal lip; v – ventrolateral lip.
Data from: Hybridization and adaptive introgression in a marine invasive species in native habitats
<p><span>Hybridization</span> <span>of distinct populations or species is an important evolutionary driving force. For invasive species, hybridization can enhance their competitive advantage in the non-native range as a source of adaptive novelty by introgression of selectively favoured alleles. </span><span>W</span><span>e use </span><span>single-nucleotide polymorphism arrays (SNP-chips) to assess genetic diversity and population structure in the invasive ctenophore <em>Mnemiopsis</em> <em>leidyi</em> </span><span>in native habitats along the USA east coast. H</span><span>ybrids are present at the distribution border of the two lineages. However, our data suggests selection against hybrids in stable habitats, while hybrids are selected for in fluctuating environments. H</span><span>ybrid populations thriving in extreme and unstable environments of the native range, such as the Chesapeake Bay, could accelerate the invasion success if translocated. For <em>M. leidyi</em>, this is especially relevant as low salinity currently limits its invasion range in western Eurasia. </span><span>Hybridization status is thus important but currently disregarded to determine high-risk areas for ballast water exchange.</span></p>
Data from: Selection for life-history traits to maximize population growth in an invasive marine species
Species establishing outside their natural range, negatively impacting local ecosystems, are of increasing global concern. They often display life-history features characteristic for r-selected populations with fast growth and high reproduction rates to achieve positive population growth rates (r) in invaded habitats. Here, we demonstrate substantially earlier maturation at a 2 orders of magnitude lower body mass at first reproduction in invasive compared to native populations of the comb jelly Mnemiopsis leidyi. Empirical results are corroborated by a theoretical model for competing life-history traits that predicts maturation at the smallest possible size to optimize r, while individual lifetime reproductive success (R0), optimized in native populations, is near constant over a large range of intermediate maturation sizes. We suggest that high variability in reproductive tactics in native populations is an underappreciated determinant of invasiveness, acting as substrate upon which selection can act during the invasion process.
Data from: Comparisons of Late Ordovician ecosystem dynamics before and after the Richmondian Invasion reveal consequences of invasive species in benthic marine paleocommunities
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Data from: Hybridization and adaptive introgression in a marine invasive species in native habitats
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Data from: Selection for life-history traits to maximize population growth in an invasive marine species
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Integrating univariate niche dynamics in species distribution models: a step forward for marine research on biological invasions
<p>Aim The development of approaches to predict the distribution and potential expansion of invasive species is still an open challenge. Here our goal is to improve the modelling procedure for marine invaders by coupling Species Distribution Models (SDMs) with an analysis of their univariate niche dynamics. In particular, we tested for the first time whether choosing model predictors among the stable niche dimensions was effective in improving predictions of invasive species expansion.<br> Location Mediterranean Sea<br> Taxon Dusky spinefoot, Siganus luridus.<br> Methods We analysed the univariate niche dynamics for S. luridus across its native and invaded ranges, by applying a standardized framework that allowed the identification of cases of niche stability or shift. We compared inter-range transferability of SDMs fitted with different combinations of labile or stable predictors. Finally, we evaluated interactions in SDM settings (calibration area, model technique and predictors set) on models' predictive ability, using independent data from the most recent phase of invasion.<br> Results We detected a pattern of niche stability for several variables, especially salinity and bathymetry, which positively influenced model inter-ranges transferability: when the models calibrated in the native range include only stable niche axes, predictive ability is improved. We also identified a shift toward lower surface temperatures in the introduced range, which were almost never experienced by the species before invasion. The model calibrated within the combined ranges was the most ecologically congruent. Also, models calibrated in the invaded range allowed a correct prediction of range expansion, with the predicted suitable areas only slightly underestimated.<br> Main conclusions We provide the first evidence that using conserved predictors in SDMs improves inter-range projections of expanding invasive species. Variable selection, calibration area and modelling technique all matter when modelling invasive species, with important interaction effects. We provide guidelines on how to improve SDMs applications in biological invasion research.</p>
Future climate change accelerates the invasive rhythm of alien marine species: new insights into the invasive potential of the world's aquaculture species red drum Sciaenops ocellatus
<p>This article accompanies the article "<strong>Integrating species distribution modeling, stable isotope and transcriptomic analysis provides insights into eco-position competition for alien red drum <em>Sciaenops ocellatus</em></strong>". The file contains supplementary material to the article.</p>
Data from: Multiple dispersal vectors drive range expansion in an invasive marine species
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Integrating univariate niche dynamics in species distribution models: a step forward for marine research on biological invasions
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Data from: Can novel genetic analyses help to identify low-dispersal marine invasive species?
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Hull fouling marine invasive species pose a very low, but plausible, risk of introduction to East Antarctica in climate change scenarios
<p><strong>Aims: </strong>To identify potential hull fouling marine invasive species that could survive in East Antarctica presently and in the future.</p> <p><strong>Location: </strong>Australia's Antarctic continental stations: Davis, Mawson and Casey, East Antarctica; and subantarctic islands: Macquarie Island and Heard and McDonald Islands.</p> <p><strong>Methods: </strong>Our study uses a novel machine-learning algorithm to predict which currently known hull fouling MIS could survive in shallow benthic ecosystems adjacent to Australian Antarctic research stations and subantarctic islands, where ship traffic is present. We used gradient boosted machine learning (XGBoost) with four important environmental variables (sea surface temperature, salinity, nitrate and pH) to develop models of suitable environments for each potentially invasive species. We then used these models to determine if any Australia's three Antarctic research stations and two subantarctic islands could be environmentally suitable for MIS now and under two future climate scenarios.</p> <p><strong>Results: </strong>Most of the species were predicted to be unable to survive at any locations between now and the end of the century, however, four species were identified as potential current threats, and five as threats under future climate change. <em>Asterias amurensis</em> was identified as a potential threat to all locations.</p> <p><strong>Main conclusions: </strong>This study suggests that the risk are very low, but plausible, that known hull fouling species could survive in the shallow benthic habitats near Australia's East Antarctica locations and suggest a precautionary approach is needed by way of surveillance and monitoring in this region, particularly if propagule pressure increases. Whilst some species could survive as adults in the region, their ability to reach these locations and undergo successful reproduction is considered unlikely based on current knowledge.</p>
Data from: Species richness and interacting factors control invasibility of a marine community
Anthropogenic vectors have moved marine species around the world leading to increased invasions and expanded species' ranges. The biotic resistance hypothesis of Elton (in The ecology of invasions by animals and plants, 1958) predicts that more diverse communities should have greater resistance to invasions, but experiments have been equivocal. We hypothesized that species richness interacts with other factors to determine experimental outcomes. We manipulated species richness, species composition (native and introduced) and availability of bare space in invertebrate assemblages in a marina in Monterey, CA. Increased species richness significantly interacted with both initial cover of native species and of all organisms to collectively decrease recruitment. Although native species decreased recruitment, introduced species had a similar effect, and we concluded that biotic resistance is conferred by total species richness. We suggest that contradictory conclusions in previous studies about the role of diversity in regulating invasions reflect uncontrolled variables in those experiments that modified the effect of species richness. Our results suggest that patches of low diversity and abundance may facilitate invasions, and that such patches, once colonized by non-indigenous species, can resist both native and non-indigenous species recruitment.
Fig. 1. Maxvachonia chabaudi Mawson, 1972 in Native species Maxvachonia chabaudi Mawson, 1972 (Nematoda: Cosmocercoidea) found in the invasive marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia
Fig. 1. Maxvachonia chabaudi Mawson, 1972 from the marine toad Rhinella marina (Linnaeus) (Anura: Bufonidae) in Australia. A–C – anterior part of female (showing variable position of vulva in different individuals), lateral view; D – anterior part of male, lateral view; E – magnified image of cephalic end, lateral view; F – posterior end of male, lateral view; G – gubernaculum and spicules, lateral view; H–J – different developmental stages of eggs; K – tail tip of female; L – posterior end of female, lateral view.
Hull fouling marine invasive species pose a very low, but plausible, risk of introduction to East Antarctica in climate change scenarios
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Data from: Species richness and interacting factors control invasibility of a marine community
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