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134 results for “invasion history”

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zenodo32/100

Figure 5 in Head morphology reflects the introduction history in a globally invasive carnivore-the small Indian mongoose

Figure 5. Cranial and mandibular shape assignments from the discriminant analyses of principal components.

opennotspecifiedSep 2023View details →

dryad32/100

Visual recognition and coevolutionary history drive responses of amphibians to an invasive predator

During biotic invasions, native prey are abruptly exposed to novel predators and are faced with unprecedented predatory pressures. Under these circumstances, the lack of common evolutionary history may hamper predator recognition by native prey, undermining the expression of effective anti-predatory responses. Nonetheless, mechanisms allowing prey to overcome evolutionary naïveté exist. For instance, in naïve prey, history of coevolution with similar native predators or recognition of general traits characterizing predators can favor recognition of stimuli released by invasive predators. However, few studies assessed how these mechanisms shape prey response at the community level. Here, we evaluated behavioral responses in naïve larvae of 13 amphibian species to chemical and visual cues associated with an invasive predator, the American red swamp crayfish (Procambarus clarkii). Moreover, we investigated how variation among species responses was related to their coexistence with a similar native crayfish predator. Amphibian larvae altered their behavior in presence of visual stimuli of the alien crayfish, while chemical cues elicited feeble and contrasting behavioral shifts. Activity reduction was the most common and stronger response, whereas in some species we detected more heterogeneous strategies also involving distancing and rapid escape response. Interestingly, species sharing coevolutionary history with the native crayfish were able to finely tune their response to the invasive one, performing bursts to escape. These results suggest native prey can respond to invasive predators through recognition of generic risk cues (e.g., approaching large shapes), still the capability of modulating anti-predator strategies may also depend on their coevolutionary history with similar native predators.

opencc-zeroAug 2021View details →

dryad32/100

Ecomorphological relationships and invasion history of non-native terrestrial bird species on O'ahu, Hawai'i suggests ecological fitting during community assembly

The widespread introduction of species has created novel communities in many areas of the world. Since introduced species tend to have generalized ecologies and often lack shared evolutionary history with other species in their communities, it would be expected that the relationship between form and function (i.e. ecomorphology) may change in novel communities. We tested this expectation in a subset of the novel bird community on O'ahu, Hawai'i. By relating foraging behavior observations to morphology obtained from live birds at four sites across the island, we found many relationships between species' morphology and foraging ecology that mirrored relationships found in the literature for native dominated bird communities. Both movement and certain foraging behaviors were related to a species' tarsus to wing ratio. Further, bill morphology was related to gleaning, frugivory, and flycatching behaviors. The commonness of significant ecomorphological relationships suggests that, within O'ahu's novel bird community, form is strongly related to function. We hypothesize that ecological fitting likely played a major role in the assembly of this novel community conserving the relationships between form and function found in many other bird communities. To further support this hypothesis, we used niche data from EltonTraits 1.0 to determine if the establishment of bird species introduced to O'ahu was related to the distinctiveness of their ecological niche from the incumbent community. Introduced species were more likely to establish on O'ahu if their diets were less similar to the bird species already present on the island. Our results support the idea that ecological fitting is an important mechanism in shaping ecological communities, especially in the Anthropocene, thereby influencing novel community assembly and functioning.

opencc-zeroSep 2021View details →

zenodo32/100

Supplementary material 1 from: Liu C, Groff T, Anderson E, Brown C, Cahill Jr JF, Paulow L, Bennett JA (2023) Effects of the invasive leafy spurge (Euphorbia esula L.) on plant community structure are altered by management history. NeoBiota 81: 157-182. https://doi.org/10.3897/neobiota.81.89450

Supplemental information and results from Groff Liu et al. Management efffects on leafy spurge invasion impacts

opencc-zeroJan 2023View details →

zenodo32/100

Effects of food plants on life-history traits of the newly invasive fall armyworm Spodoptera frugiperda

Background:The fall armyworm (FAW) Spodoptera frugiperda (J. E. Smith) (Lepidoptera; Noctuidae) has invaded Jiangxi Province, Southeast China for the past three years. Although the FAW displays a wide host range, its main host plants in Jiangxi Province is field corn. Understanding the population dynamics of the FAW on different host plants is critical for developing an appropriate control strategy. Objectives: This study investigated the effects of food plants (corn, peanut, soybean and sugarcane) on life-history traits of FAW and tested the leaf contents of the total flavonoids, reducing sugars, sucrose and C/N ratio of these host plants. Results: We found that the FAW fed on corn leaves exhibited significantly shorter larval and pupal development times, larger body weight, higher growth rate, lower weight loss, smaller sexual size dimorphism, shorter preoviposition period and higher fecundity than those fed on peanut, soybean and sugarcane leaves. The FAW showed a protogyny phenomenon because the pupal development stage was significantly longer in males than females. Food plants changed the relationships between larval development time and pupal weight and between fecundity and longevity. The corn leaves showed significantly higher contents of reducing sugars and sucrose, lower content of the total flavonoids and a moderate C/N ratio compared with the other leaves, suggesting that the corn leaf tissues are more nutritious. Conclusions: Our results provide the most comprehensive information about the life-history traits of this newly invasive pest. These findings may help us understand why the FAW mainly infests corn plants and may be critical for the development of strategies to predict infestation levels.

opencc-by-4.0Mar 2023View details →

dryad32/100

Data for: Invasion history of Lycium ferocissimum in Australia – the impact of admixture on genetic diversity and differentiation

Aim: We investigated the invasion history of Lycium ferocissimum, a spine-covered shrub native to South Africa that has developed into a damaging invasive plant of undisturbed landscapes and pastures across southern and eastern Australia. In addition to identifying the provenance of the Australian plants, we tested for evidence of admixture, and contrasted genetic diversity and structuring across the native and introduced ranges. Location: Samples were collected across South Africa (24 localities) and Australia (26 localities). Methods: We used genotyping-by-sequencing (3,130 SNPs across 381 individuals) to assess population genetic structuring in L. ferocissimum across Australia and South Africa. Coalescent analyses were used to explicitly test contrasting invasion scenarios. Results: Clear geographic genetic structuring was detected across South Africa, with distinct clusters in the Eastern and Western Cape provinces. The L. ferocissimum plants in Australia form their own genetic cluster, with a similar level of genetic diversity as plants in South Africa. Coalescent analyses demonstrated that the lineage in Australia was formed by admixture between Eastern Cape and Western Cape plants, with analyses suggesting that plants from both African regions were originally introduced to South Australia. We detected little evidence of geographic genetic structure across Australia, although many of the populations were genetically distinct from one another. Main conclusions: Our results illustrate how admixture can result in genetically diverse and distinct invasive populations. The complex invasion history of L. ferocissimum in Australia poses particular challenges for biological control. We suggest potential biological control agents should be screened against admixed plants (in addition to plants from the Eastern and Western Cape) to test whether they provide effective control of the genetically distinct invasive lineage.

opencc-zeroApr 2023View details →

dryad32/100