Preprints
Filtering by Subject: Life Sciences
Are tropical ant and termite assemblages along a forest recovery gradient habitat or dispersal limited?
Published: 2025-03-27
Subjects: Biodiversity, Ecology and Evolutionary Biology, Entomology, Life Sciences
Regenerating forests comprise a significant proportion of forest ecosystems in the tropics. While we are beginning to understand assembly mechanisms of tree communities after anthropogenic disturbances, those of animal communities are still poorly understood. It has been shown that locally established ant communities clearly assemble along gradients of forest recovery from active agriculture over [...]
Illustrated catalogue and preliminary phylogeny of 330 species of Arctiinae moth species from the Chocó rainforest in NW Ecuador: most species are undescribed
Published: 2025-03-27
Subjects: Life Sciences
Tropical rain forests are the most species rich terrestrial habitats on Earth, but their insect diversity is understudied, and it is unclear how many species are already scientifically described. A model group to study description patterns are tiger moths (Erebidae: Arctiinae), a species-rich moth clade that comprises subtaxa that differ considerably in appearance. We inventoried Arctiinae moths [...]
LEPY: A Python-Based Pipeline for Automated Morphological Trait Analysis of Lepidoptera Images
Published: 2025-03-26
Subjects: Life Sciences
1. We present LEPY, a Python-based pipeline for automating the extraction and analysis of morphological traits, including structural and colour properties, from mounted Lepidoptera specimens. It uses a U-Net neural network for image segmentation and a scale bar for precise measurements. LEPY is designed to be easy and reproducible, ensuring efficient and consistent analysis of large Lepidoptera [...]
Taxonomic uncertainty: causes, consequences, and metrics
Published: 2025-03-26
Subjects: Life Sciences
Taxonomic uncertainty is prevalent across many biological groups. Yet it remains overlooked in ecology, evolution, and conservation research, leading to potential misinterpretations of biodiversity patterns. Here, we synthesize the recent literature to define taxonomic uncertainty, examine its root causes and consequences, and present key metrics for its quantification. We argue that species [...]
A fundamental theory of actual error for species population monitoring
Published: 2025-03-25
Subjects: Life Sciences
Progress towards many national and international targets to halt and reverse declines of species populations (abundances) will be measured against Multispecies Biodiversity Indicators (MSIs). Like any sample-based estimator, MSIs approximate some real-world quantity (the estimand), and the difference between the two is the ‘actual’ or realised statistical error. We propose a general estimator and [...]
Quantitative metabarcoding reveals the effects of ecological factors and invasive species on functional diversity of freshwater insects
Published: 2025-03-25
Subjects: Life Sciences
Aquatic insects represent the majority of freshwater biodiversity, yet they are less studied than other taxa. Responses of aquatic communities to stressors are rarely assessed and are usually measured in terms of taxonomic richness derived from presence-absence data, despite certain mechanisms that may cause a reduction in the biomass of certain species, without causing their disappearance. The [...]
Recovery of phylogenetic diversity and phylogenetic structure in trees and animals along a chronosequence of tropical forest regeneration
Published: 2025-03-24
Subjects: Ecology and Evolutionary Biology, Life Sciences
Tropical forests are highly threatened habitats with the capacity to recover after disturbance. Integrating phylogenies in the study of forest recovery provides key information on the evolutionary relationships of communities through succession, and also serves as a proxy of their functional trait diversity and resilience capacity. We used phylogenetic and community data for trees and animal [...]
Leaf litter Decomposition dynamics across a Recovering Tropical Forest in the lowland Ecuadorian Chocó
Published: 2025-03-24
Subjects: Life Sciences
Litter decomposition by arthropods, microbes, and fungi is a key ecosystem process in tropical forests, yet its response to forest disturbance and recovery remains poorly understood. To investigate decomposition dynamics across forest succession, we conducted an experiment in the Ecuadorian lowland Chocó (Esmeraldas) using a chronosequence approach. We deployed above- (AG) and belowground (BG) [...]
Quantifying macro-evolutionary patterns of trait mean and variance with phylogenetic location-scale models
Published: 2025-03-24
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
Understanding how both the mean (location) and variance (scale) of traits differ among species and lineages is fundamental to unveiling macroevolutionary patterns. Yet, traditional phylogenetic comparative methods primarily focus on modelling mean trait values, often overlooking variability and heteroscedasticity that can provide critical insights into evolutionary dynamics. Here, we introduce [...]
Social tethers: density-dependent social tethers inhibit fitness
Published: 2025-03-24
Subjects: Life Sciences
Putative mechanisms affecting fitness that underlie why animals occupy a particular place are often in tension. A tension amplified in social animals, where individuals are often not free to make independent habitat selection or foraging decisions. The ideal free distribution (IFD) is a density-dependent emergent property describing how individuals should distribute themselves to maximize fitness [...]
Inbreeding and high developmental temperatures affect cognition and boldness in guppies (Poecilia reticulata)
Published: 2025-03-21
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Life Sciences
Inbreeding impairs the cognitive abilities of humans, but its impact on cognition in other animals is poorly studied. For example, environmental stress (e.g. food limitation and extreme temperatures) often amplifies inbreeding depression in morphological traits, but whether cognition is similarly affected is unclear. We, therefore, tested if a higher temperature (30°C versus 26°C) during [...]
Paternity analysis reveals sexual selection on cognitive performance in mosquitofish
Published: 2025-03-21
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Life Sciences
In many animal species, cognitive abilities are under strong natural selection because decisions about foraging, habitat choice and predator avoidance affect fecundity and survival. But how has sexual selection, which is usually stronger on males than females, shaped the evolution of cognitive abilities that influence success when competing for mates or fertilizations? We aimed to investigate [...]
Gene flow and vertical stratification of pollination in the bat-pollinated liana species Marcgravia longifolia
Published: 2025-03-20
Subjects: Life Sciences
Pollen dispersal is a key driver of gene flow in plant populations, shaping their spatial genetic structure (SGS). In tropical forests, plant-pollinator interactions vary across vertical strata due to differences in microclimate, resource availability, and foraging behavior. Bats, an important tropical pollinator group, have been observed to exhibit vertical stratification in their foraging [...]
Alike but still different: coexistence of four raptor species explained by breeding niche overlap
Published: 2025-03-20
Subjects: Animal Studies, Biodiversity, Ecology and Evolutionary Biology, Life Sciences
Late Pleistocene faunal community patterns disrupted by Holocene human impacts
Published: 2025-03-20
Subjects: Biodiversity, Ecology and Evolutionary Biology, Life Sciences, Paleobiology
We analysed fossil mammal assemblages from over 350 Late Pleistocene and Holocene sites worldwide to test whether human activities, such as agriculture, domestication and intensified land use, restructured global patterns of mammal co-occurrence. Using presence-absence data, we contrasted a novel iterative ‘chase clustering’ method, which is compositionally driven, against a traditional spatially [...]