Previous research has demonstrated that morphological variation among riverine populations often reflects local hydrological conditions, habitat structure, and restricted connectivity among drainage systems. Understanding population-level variation is critical for accurate taxonomic resolution and effective fisheries management of widely distributed freshwater species. This study examines…
This study investigates the morphology of an isolated population of the cyprinid fish Capoeta saadii in the Nesa River within the Lut-Kavir Basin of Iran. Based on an integrated analysis of 52 specimens, the study employed meristic counts, 17 standardized morphometric characters, and seven otolith (asteriscus) morphometric characters. The studied population exhibits distinctive meristic and…
Acantholimon (Plumbaginaceae) is one of the most diverse genera in Iran with 83 accepted species. Approximately 22 species are documented in the south regions of the country, 16 of which are endemic, mainly restricted to Kerman province. For this study, approximately 45 specimens were collected and analyzed to investigate taxonomic and molecular relationships. Significant taxonomic value was found…
Endemism is a core concept in biogeography, yet terminology describing its different forms remains inconsistent. In particular, no formally defined term exists for taxa whose entire natural distribution is confined to a single geographical or biogeographical unit. This perspective proposes euendemic as a clear and standardized descriptor for complete endemism. The proposed term is strictly spatial…
The intertidal zones of Lombok Island, located at the edge of the Wallace Line, represent a biogeographically important transition region that supports high levels of marine biodiversity. This study applied DNA barcoding based on the mitochondrial cytochrome c oxidase subunit I (COI) gene to identify and analyze the phylogenetic relationships of cowries (Gastropoda: Cypraeidae) collected from…
Leaf stomatal morphology is a key determinant of plant adaptation to environmental stress, particularly drought. This study conducted a comprehensive assessment of stomatal traits across 26 grape cultivars (Vitis vinifera L.) cultivated in the semi-arid region of Qazvin, Iran. Over two growing seasons (2022-2023), epidermal impressions were prepared using the nail polish technique, and parameters…
Psephellus, a genus of the tribe Cardueae in the family Asteraceae, comprises 114 currently accepted species. In Iran, the genus includes 14 species in eight sections, of which seven are endemic. For the taxonomic study of Psephellus sect. Psephelloidei (Boiss.) Wagenitz Hellwig, extensive collections were conducted across its distribution area in northwestern Iran. Plant specimens were collected…
Current research investigated twenty barley genotypes under rainfed conditions to examine variability in yield, its components, and morphological traits, while identifying key selection criteria. Biomass-related traits, such as biological yield and straw weight, displayed high variability, whereas thousand-seed weight showed minimal variation. Traits such as seed yield per plant, seed number per…
