Urban areas can drive rapid evolution of species and are hotspots for entry and establishment of invasive species, but it is unclear how urban evolution is impacting the process and risk of invasion by non‐native species. Using a synthesis of current research as a basis, we contend that urban evolution of non‐native species can enhance invader establishment, spread, and ecological impact, which can facilitate invader success under future global change conditions. In addition, we highlight that ecological opportunity in urban areas is a potentially important but unexplored mechanism that could accelerate invader evolution. Urban evolution of invaders is a critical new area of research that could reveal novel pathways and mechanisms in the invasion process, and improve predictions and management of invasive species around the world.

Journals publishing open access (OA) articles often require that authors pay article processing charges (APC). Researchers in the Global South often cite APCs as a major financial obstacle to OA publishing, especially in widely-recognized or prestigious outlets. Consequently, it has been hypothesized that authors from the Global South will be underrepresented in journals charging APCs. We tested this hypothesis using >37,000 articles from Elsevier’s ‘Mirror journal’ system, in which a hybrid ‘Parent’ journal and its Gold-OA ‘Mirror’ share editorial boards and standards for acceptance. Most articles were non-OA; 45% of articles had lead authors based in either the United States of America (USA) or China. After correcting for the effect of this dominance and differences in sample size, we found that OA articles published in Parent and Mirror journals had lead authors with similar Geographic Diversity. However, Author Geographic Diversity of OA articles was significantly lower than that of non-OA articles. Most OA articles were written by authors in high-income countries, and there were no articles in Mirror journals by authors in low-income countries. Our results for Elsevier’s Mirror-Parent system are consistent with the hypothesis that APCs are a barrier to OA publication for scientists from the Global South.

Many OA journals require authors pay an article processing charge (APC), which researchers in the Global South often cite as an insurmountable financial barrier. This has led to speculation that there will be lower representation of these authors in OA journals charging APCs. We used “mirror journals” – APC-charging OA versions of paywalled (PW) titles with whom they share editorial boards and standards for acceptance – to investigate the relationship between APCs and the geographic diversity of authors. Most of the >41,000 articles we reviewed were published in PW journals. Although lead authors were based in >140 countries, ~45% were based in either the United States of America (USA) or China. After correcting for differences in sample size, we found no difference between OA and PW journals in the number of countries in which lead authors were based. After correcting for the dominance of China and the USA, we found that author diversity in OA journals was significantly lower than in PW journals. Most OA articles were written by authors in high-income countries; no articles in OA journals had first authors from low-income countries. Our results suggest APCs are a barrier to OA publication for scientists from the Global South.

Native species can coexist with invasive congeners by partitioning niche space; however, impacts from invasive species often occur alongside other disturbances. Native species' responses to the interactions of multiple disturbances remain poorly understood. Here we study the impacts of urbanization and an invasive congener on a native species. Using abundance (catch-per-unit effort) and vertical distribution of native green anoles (Anolis carolinensis) and invasive brown anoles (Anolis sagrei) across a gradient of natural-to-urban forests, we ask if niche shifting (lability) is occurring, and if it can mitigate impacts from one or both disturbances. We use generalized linear models to relate species abundances across the landscape to urbanization, forest structural complexity, and congener abundances (i.e., A. sagrei); and test for an interaction between urbanization and congener abundance. Our data show that A. sagrei presence results in a 17-fold upward shift in vertical niche of A. carolinensis-an 8.3 m shift in median perch height, and models reveal urbanization also drives an increase in A. carolinensis perch height. A. carolinensis and A. sagrei abundances negatively and positively correlate with urbanization, respectively, and neither species' abundance correlate with congener abundance. Despite a positive correlation between A. sagrei abundance and urbanization, our results do not show evidence of this interaction affecting A. carolinensis. Instead, niche lability appears to enable the native species to mitigate the impact of one driver of decline (invasive competition) while our data suggest it declines with the second (urbanization).

Invasive species threaten ecosystems globally, but their impacts can be cryptic when they occur indirectly. Invader phenology can also differ from that of native species, potentially causing seasonality in invader impacts. Yet, it is unclear if invader phenology can drive seasonal patterns in indirect effects. We used a field experiment to test if an invasive grass ( Imperata cylindrica ) caused seasonal indirect effects by altering rodent foraging and seed predation patterns through time. Using seeds from native longleaf pine ( Pinus palustris ), we found seed predation was 25% greater, on average, in invaded than control plots, but this effect varied by season. Seed predation was 24–157% greater in invaded plots during spring and autumn months, but invasion had no effect on seed predation in other months. One of the largest effects occurred in October when longleaf pine seeds are dispersed, suggesting potential effects on tree regeneration. Thus, seasonal patterns in indirect effects from invaders may cause underappreciated impacts on ecological communities.