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The Missing Branches of the Bee Tree of Life: Addressing Global Darwinian Shortfalls and Their DriversNARA Subscribed
Aim Estimate the Darwinian shortfall (i.e., the lack of knowledge about phylogenetic relationships) of bees worldwide, as well as identify their drivers. Location Global. Taxon Bees (Hymenoptera, Anthophila). Methods We built phylogenies for over 12,000 bee species, combining the most comprehensive phylogeny and an algorithm with random solutions to insert missing lineages. The Darwinian shortfall was quantified as the Phyloge...
Aim We evaluated how native vegetation cover influences the diversity of arachnid assemblages across multiple spatial scales in major Brazilian ecosystems. Location Brazil (Amazon and Atlantic rainforests, Cerrado savanna and Caatinga dry forest). Taxon Arachnida (Opiliones, Pseudoscorpiones and Scorpiones). Methods We sampled arachnids at 120 sites using active search and litter sifting. Native vegetation cover was quantified...
Influence of Joint Degradation on the Stand-up Time of Rock Structures Around Underground OpeningsNARA Subscribed
The progressive degradation of joints in rock masses may occur through time-dependent failure of intact rock bridges along discontinuity planes, leading to a reduction in joint cohesive strength and, ultimately, to the onset of instability in underground excavations. This paper investigates the role of rock bridges in controlling the stability of a symmetrical roof block in a circular opening, under the assumption of temporall...
Aim We investigate the distribution of dispersal modes — endozoochory (via animal ingestion), synzoochory (via animal seed accumulation) and anemochory (via wind)—and seed mass of woody plants across Brazilian ecosystems, testing whether their relative abundance in local plant communities could be predicted by climate, edaphic factors and dispersal agents (e.g., the main vectors moving seeds). We expected climate to be the mai...
The presence of an atavistic caniniform alveolus in Nothrotherium maquinense (Xenarthra, Folivora, Nothrotheriidae)NARA Subscribed
Sloths (Folivora) display remarkable morphological diversity yet share a highly conserved dental formula, whose occasional deviations offer key insights into their evolutionary history. Among nothrotheriids, Neogene species retained upper and lower caniniforms, whereas these teeth were lost in Pleistocene genera. Here we describe, for the first time, a poorly developed alveolus interpreted as an atavistic upper caniniform alve...
Predictive validation of the repeated low-dose reserpine rodent model of parkinsonismNARA Subscribed
L-DOPA (LD) is the gold-standard treatment of motor symptoms in Parkinson’s disease (PD), conventionally used to prove the predictive value of PD animal models. This study aimed to investigate the predictive validity of an adaptation of the conventional reserpine model of PD: the repeated low-dose reserpine administration in rodents, which promotes progressive motor impairment in catalepsy, vacuous chewing behavior tests, and...
Unravelling the skin of the nurse shark: A morphological description of the placoid scales of Ginglymostoma cirratumNARA Subscribed
Ginglymostoma cirratum , commonly known as the nurse shark, is a nocturnally active benthic shark, often found in western and eastern Atlantic waters. Although this shark has been well explored in many biological aspects, few studies have thoroughly examined the morphology of its dermal denticles (or placoid scales). The dermal denticles are teeth‐like structures present in the skin of sharks and play an important role in the...
Understanding how internal mechanisms, social dynamics, and environmental factors interact to influence foraging behaviour is essential to unravel the complexity of decision-making in social insects. Despite extensive research on foraging behaviour in social insects, the mechanisms driving solitary foraging, particularly in Neotropical species, remain largely unexplored. This laboratory study evaluated how experience, colony s...
Grazing intensity and seasonality regulate N cycling via litter and excreta in tropical grass–legume pasturesNARA Subscribed
Integrating forage legumes into grasslands reduces the need for N fertilization, but its effectiveness depends on grazing management. This 2 years study evaluated N cycling in Urochloa brizantha and Arachis pintoi pasture under severe (10 cm stubble height), moderate (15 cm stubble height), and light (20 cm stubble height) grazing intensities. Nitrogen cycling from litter and livestock excreta were assessed. Moderate grazing d...
Progress status of the NUSES Space MissionNARA Subscribed