Taxonomic lists are important tools for efficient communication about biodiversity. The processes by which they are created and maintained need to be robust, scientifically sound, and transparent. Articulating and scoring a set of governance quality indicators provides a way to assess the relative strengths of list management, gives list users a means to assess the quality of this process, augments the information available to list aggregators, and allows patterns to be measured over time and among forms of life. Based on published principles, we created 12 governance quality indicators which we tested on 16 lists spanning a range of taxonomic groups. Independence of taxonomy from nomenclature scored most strongly, but scores for local and regional involvement were lower. The governance quality indicators may eventually provide a rubric for assessing best practice species list governance but now need a period of further testing, review, and refinement before they are institutionalized.
Jingmen tick virus (JMTV) is an emerging tick-associated virus related to flaviviruses. Substantial information gaps remain on the epidemiology and public health impact of JMTV, despite evidence for symptomatic human infections, detection in potential zoonotic reservoirs and widespread global circulation. Using an unbiased metagenomics approach based on long read sequencing, we screened field-collected ticks (n = 3232) of various life stages from locations of spillover risk across continents, from Eastern Africa (Kenya), Central America (Belize), and North America (Arkansas, United States). Signals of virus detection were observed in 32.9% of the pooled samples comprising adult, nymph and larvae stages. JMTV genome segments were assembled in 16.7% of the pools with initial virus detection. Adult ticks comprising Amblyomma gemma, Hyalomma rufipes, Rhipicephalus. evertsi and Rhipicephalus pulchellus from Kenya yielded complete JMTV genome assemblies. Evidence for tick-associated arbo-jingmenviruses was described for the first time in Belize, identified as complete genome segments encoding for non-structural virus proteins in pooled larvae. Analysis of globally distributed complete JMTV genomes revealed a considerable geographic partitioning of diversity and two significantly supported virus clades and genomic underrepresentation in many regions with documented virus activity. Further investigations and expanded screening are needed to elucidate JMTV and arbo-jingmenvirus global epidemiology.
Habitat fragmentation negatively affects many native migratory fish populations. However, this fragmentation can also prevent the spread and establishment of invasive species. We modified the dendritic connectivity index (DCI), a commonly used freshwater connectivity metric, to account for multiple invasive dispersal pathways in estimates of invasive species connectivity. We considered dispersal from source populations in the outlet by limiting the diadromous form of the DCI to consider dispersal paths from the outlet to uninvaded segments. We additionally considered dispersal from already established populations by modifying the potamodromous DCI to consider dispersal paths from invaded segments to uninvaded ones. We applied this method to the case of the Grand River watershed in Ontario, Canada. We focused on the round goby (Neogobius melanostomus), a pervasive invasive species in the region with established populations in our studied watershed. We found that invasive connectivity was closely linked to native species' connectivity. In single barrier removal simulations, gains in native connectivity were in most cases nearly completely matched by gains in invasive connectivity. When multiple barrier removals were considered, invasive connectivity further constrained restorative actions. Specifically, connectivity restoration through barrier removals that did not consider invasive dispersal increased the risk of these populations spreading at all levels of barrier removal. Even when both native and invasive priorities were considered, increases in invasive connectivity could not be avoided because round goby populations are established in mainstem regions. We found that accounting for this dispersal risk from established populations, in addition to dispersal from the outlet, was essential to fully consider the risk of further spread to the watershed's tributaries. In addition, we identified areas where native connectivity was high relative to invasive connectivity, which could inform selective habitat restoration. Taken together, we demonstrated the importance of considering invasive connectivity from multiple sources when undertaking connectivity restoration.
The biodiversity crisis is exceptionally severe in the freshwater systems of the highly threatened Afromontane region. We estimated abundance, occupancy and detection probabilities and studied functional traits of ecological significance for adults and larvae of Kenya Jewel (Platycypha amboniensis Martin, 1915) and Giant Sprite (Pseudagrion bicoerulans Martin, 1907) in Mount Kenya Forest. Our estimates of abundance were based on replicated counts, while occupancy and detection probabilities were estimated using a single-season, two-species occupancy formulation. We found that detection probabilities of one species were influenced by the detection probabilities of the other, but conversely, occupancy was not. This was supported by morphological traits, as the larvae of P. amboniensis are adapted to rocky and fast-flowing lotic streams, while P. bicoerulans is adapted to vegetated, littoral, and slow-moving reaches of the same streams. This means that, while these species have different adaptations, their co-occurrence depends on the heterogeneity of the microhabitats. We recommend implementation of ecosystem restoration approaches that will contribute to maintain habitat complexity and therefore increase the resilience of these co-occurring species to future environmental changes. The occurrence of Kenya Jewel was not influenced by the occurrence of Giant Sprite, and there was neither competition nor niche overlap. This aligns with the differences in ecological adaptations based on the functional morphology of adults and larvae. This evidence is useful for restoration of the ecosystem to ensure that these species are conserved concurrently in their range of co-occurrence.
Diverse factors, including environmental features and cognitive processes, can drive animals' movements and space use, with far-reaching implications. For example, repeated use of individual-level travel routeways (directionally constrained but imperfectly aligned routes), which results in spatial concentration of activity, can shape encounter-based processes including predation, mate finding, and disease transmission. However, how much variation in routeway usage exists across species remains unknown. By analyzing GPS movement tracks for 1,239 range-resident mammalian carnivores-representing 16 canid and 18 felid species from six continents-we found strong evidence of a clade-level difference in species' reliance on repeatedly used travel routeways. Across the global dataset, tracked canids had a 15% (±7 CI) greater density of routeways within their home ranges than did felids, rising to 33% (±16 CI) greater in landscapes shared with tracked felids. Moreover, comparisons within species across landscapes revealed broadly similar home range routeway densities despite habitat differences. On average, canids also reused their travel routeways more intensively than did felids, with hunting strategies and spatial contexts also contributing to the intensity of routeway usage. Collectively, our results suggest that key aspects of carnivore routeway-usage have an evolutionary component. Striking interspecific and clade-level differences in carnivores' reliance on reused travel routeways within home ranges identify important ways in which the movement patterns of real-world predators depart from classical assumptions of predator-prey theory. Because such departures can drive key aspects of human-wildlife interactions and other encounter-based processes, continued investigations of the relationships between movement mechanisms and space use are critical.
