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A comprehensive image dataset for the identification of lemon leaf diseases and computer vision applications.
Data Brief
February 2025
Department of CSE, Daffodil International University, Bangladesh.
A comprehensive dataset on lemon leaf disease can surely bring a lot of potentials into the development of agricultural research and the improvement of disease management strategies. This dataset was developed from 1354 raw images taken with professional agricultural specialist guidance from July to September 2024 in Charpolisha, Jamalpur, and further enhanced with augmented techniques, adding 9000 images. The augmentation process involves a set of techniques-flipping, rotation, zooming, shifting, adding noise, shearing, and brightening-to increase variety for different lemon leaf condition representations.
View Article and Find Full Text PDFBehavioral corroboration that Saitis barbipes jumping spiders cannot discriminate between males' red and black ornaments.
Naturwissenschaften
January 2025
Institute for Animal Cell and Systems Biology, University of Hamburg, Martin-Luther-King Platz 3, Hamburg, 20146, Germany.
Physiological or genetic assays and computational modeling are valuable tools for understanding animals' visual discrimination capabilities. Yet sometimes, the results generated by these methods appear not to jive with other aspects of an animal's appearance or natural history, and behavioral confirmatory tests are warranted. Here we examine the peculiar case of a male jumping spider that displays red, black, white, and UV color patches during courtship despite the fact that, according to microspectrophotometry and color vision modeling, they are unlikely able to discriminate red from black.
View Article and Find Full Text PDFMales discriminate between substrate-borne cues of conspecific females based on age and mating status in the jumping spider, .
R Soc Open Sci
October 2024
Entomology and Nematology Department, University of Florida, Gainesville, FL 32611, USA.
Sexual selection is often studied with a focus on female mate choice, wherein females evaluate male signals to select an optimal mate. However, in some systems, males should also make careful decisions about the females they choose to court, particularly when faced with the risk of precopulatory sexual cannibalism. Here, we explore the idea that male jumping spiders () may mitigate this risk by responding to female cues probably associated with female aggression and/or receptivity.
View Article and Find Full Text PDFActive state structures of a bistable visual opsin bound to G proteins.
Nat Commun
October 2024
Laboratory of Biomolecular Research, PSI Center for Life Sciences, Villigen-PSI, Switzerland.
Opsins are G protein-coupled receptors (GPCRs) that have evolved to detect light stimuli and initiate intracellular signaling cascades. Their role as signal transducers is critical to light perception across the animal kingdom. Opsins covalently bind to the chromophore 11-cis retinal, which isomerizes to the all-trans isomer upon photon absorption, causing conformational changes that result in receptor activation.
View Article and Find Full Text PDFHidden in red: evidence for and against red camouflage in a jumping spider (Saitis barbipes).
Naturwissenschaften
October 2024
Institute of Cell and Systems Biology of Animals, University of Hamburg, Martin-Luther-King Platz 3, 20146, Hamburg, Germany.
Investigating the conspicuousness of animal color patterns to different observers is crucial for understanding their function. This study examines the peculiar case of a jumping spider (Saitis barbipes) whose males display red and black ornaments during courtship despite an apparent inability to distinguish these colors. We propose that, through predator eyes, red may actually be a better match than black to the spiders' leaf litter background, and that the black fringe of hairs surrounding red ornaments may blur with red at natural predator acuities and viewing distances to produce a background-matching desaturated red.
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