1,720,971 research outputs found
Threatened fishes of the world: Alburnoides petrubanarescui Bogutskaya & Coad 2009 (Actinopterygii: Leuciscidae)
Full text linkAlburnoides petrubanarescui is endemic to the Urmia Lake basin, shared by Iran and Turkey. Previously, the species was found in several rivers in this basin, however, it is currently only found in the upper part of the Nazlu Chay River. The species' extent of occurrence (EOO), which was previously estimated to be 20.000 km2, is now 300 km2. Over the past three generations (10 years), the EOO of Urmia spirlin has decreased by 98%, however, the population of the Nazlu River is stable, and there is no strong evidence to suggest that the population will decline in the future. Drought and water abstraction cause the species' population to reduce. Dam building and river pollution reduce their range, making them vulnerable to extinction. Therefore, we classified the species as Vulnerable D2
Mapping endemic freshwater fish richness to identify high‐priority areas for conservation: An ecoregion approach
No full textAbstract Freshwater ecosystems are experiencing accelerating global biodiversity loss. Thus, knowing where these unique ecosystems' species richness reaches a peak can facilitate their conservation planning. By hosting more than 290 freshwater fishes, Iran is a major freshwater fish hotspot in the Middle East. Considering the accelerating rate of biodiversity loss, there is an urgent need to identify species‐rich areas and understand the mechanisms driving biodiversity distribution. In this study, we gathered distribution records of all endemic freshwater fishes of Iran (85 species) to develop their richness map and determine the most critical drivers of their richness patterns from an ecoregion approach. We performed a generalized linear model (GLM) with quasi‐Poisson distribution to identify contemporary and historical determinants of endemic freshwater fish richness. We also quantified endemic fish similarity among the 15 freshwater ecoregions of Iran. Results showed that endemic freshwater fish richness is highest in the Zagros Mountains while a moderate level of richness was observed between Zagros and Alborz Mountains. High, moderate, and low richness of endemic freshwater fish match with Upper Tigris & Euphrates, Namak, and Kavir & Lut Deserts ecoregions respectively. Kura – South Caspian Drainages and Caspian Highlands were the most similar ecoregions and Orumiyeh was the most unique ecoregion according to endemic fish presence. Precipitation and precipitation change velocity since the Last Glacial Maximum were the most important predictors of endemic freshwater fish richness. Areas identified to have the highest species richness have high priority for the conservation of freshwater fish in Iran, therefore, should be considered in future protected areas development
Using endemic freshwater fishes as proxies of their ecosystems to identify high priority rivers for conservation under climate change
No full textA study of morphological characteristics of Paracobitis Bleeker 1863 complex in Sistan basin
No full textWe conducted this study during the Summer, 2013 to evaluate morphological features of the species of the genus Paracobitis in Sistan basin. For this purpose, 60 specimens randomly were caught by a gill-net from different parts of Lake Chah Nime (Zabol, Sistan and Baluchistan), fixed in formalin solution and transferred to a laboratory for further examination. We measured 37 absolute morphological characteristics by a digital caliper and 6 meristic analyses using a stereomicroscope. We calculated 34 relative morphological characteristics with a division of absolute morphological characteristics by standard length and head length. In order to compare the morphological samples, the obtained morphological characteristics (absolute and relative) and meristic analyses were analyzed by principal component analysis and canonical variables. According to the results, we confirmed the existence of two species, P. vignai and P. rhadinaea, in the studied areas and appropriate geomorphic features were provided for their separation - barbel length, presence or absence of scales, mouth width and number of pectoral fin rays as morphological characteristics to distinguish the two species. In addition to the two species, different morphological forms were present in the sample. We proposed the use of molecular markers for better, more accurate results
Figure 1 from: Jouladeh-Roudbar A, Eagderi S, Ghanavi HR, Doadrio I (2017) A new species of the genus Capoeta Valenciennes, 1842 from the Caspian Sea basin in Iran (Teleostei, Cyprinidae). ZooKeys 682: 137-155. https://doi.org/10.3897/zookeys.682.12670
No full textFigure 3 from: Jouladeh-Roudbar A, Eagderi S, Ghanavi HR, Doadrio I (2017) A new species of the genus Capoeta Valenciennes, 1842 from the Caspian Sea basin in Iran (Teleostei, Cyprinidae). ZooKeys 682: 137-155. https://doi.org/10.3897/zookeys.682.12670
No full textFigure 7 from: Jouladeh-Roudbar A, Eagderi S, Ghanavi HR, Doadrio I (2017) A new species of the genus Capoeta Valenciennes, 1842 from the Caspian Sea basin in Iran (Teleostei, Cyprinidae). ZooKeys 682: 137-155. https://doi.org/10.3897/zookeys.682.12670
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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