Topic
Iberus
About: Iberus is a research topic. Over the lifetime, 36 publications have been published within this topic receiving 657 citations.
Papers
TL;DR: In aquaria, adults and young-of-the-year (YOY) of both Spanish toothcarp Aphanius iberus and Valencia hispanica received more aggression in the presence of eastern mosquitofish Gambusia holbrooki, and aggression almost disappeared at low water temperatures.
Abstract: In aquaria, adults and young-of-the-year (YOY) of both Spanish toothcarp Aphanius iberus and Valencia toothcarp Valencia hispanica received more aggression in the presence of eastern mosquitofish Gambusia holbrooki. YOY of both species also showed decreased feeding rates, as did V. hispanica adults. Adult V. hispanica also were more aggressive themselves and had their reproductive behaviour disrupted. Cases of eastern mosquitofish predation on small A. iberus were also observed. The occurrence and intensity of these potentially harmful effects, however, seemed to be modulated by water temperature, reproductive condition, relative size of the interacting fishes and species-specific habitat preferences. Thus, aggression almost disappeared at low water temperatures. Valencia hispanica and eastern mosquitofish used similar vertical positions in the water column and this apparently increased the frequency of their interactions. In contrast, A. iberus preferred positions closer to the bottom than the other two species and this vertical segregation appeared to lead to less direct interaction with eastern mosquitofish. In an outdoor mesocosm experiment, under semi-natural conditions, the presence of eastern mosquitofish resulted in an almost 70% reduction in the number of o.spring produced by A. iberus. The addition of extra, non-breeding males of A. iberus had no significant effect. YOY A. iberus from cages with eastern mosquitofish or extra males were significantly smaller (c. 1 mm, or 8% shorter) than those from cages without additional fish. Results for V. hispanica were not conclusive, as very few YOY were recovered. In contrast, eastern mosquitofish did not affect the survivorship of breeding adults of both native species.
134 citations
Journal Article•
TL;DR: Morphometric variation in Aphanius iberus was analysed to demostrate the remarkable genetic divergence between Mediterranean and Atlantic population of Iberia, and revealed the Villena population as the morphologically most differentiated.
Abstract: Morphometric variation in Aphanius iberus was analysed to demostrate the remarkable genetic divergence between Mediterranean and Atlantic population of Iberia. Four discrete morphotypes in males and three in females were distinguished. Morphometric data discriminated the Atlantic and Mediterranean populations, but revealed the Villena population as the morphologically most differentiated. Atlantic populations were described as a new species, Aphanius baeticus sp. nov., which differs from A. iberus in the overall shape, coloration pattern and number of branched rays on the dorsal and anal fins. The Villena population was retained in A. iberus because, despite of its morphological differentiation, show high genetic introgression at the nuclear genome with neighbouring populations. The range of A. baeticus sp. nov. is restricted to the eight localities of the Atlantic slope of the Iberian Peninsula. This new species should be considered Critically Endangered (CR) according to the IUCN Red List Categories.
80 citations
TL;DR: High mortality among laboratory cultured Iberian toothcarp Aphanius iberus occurred in February 1997 in Valencia (Spain), and infection tests showed that the virulence for A. iberus was dependent on salinity.
Abstract: High mortality among laboratory cultured Iberian toothcarp Aphanius iberus occurred in February 1997 in Valencia (Spain). The main signs of the disease were external haemorrhage and tail rot. Bacteria isolated from internal organs of infected fish were biochemically homogeneous and identified as Vibrio parahaemolyticus. The bacteria were haemolytic against erythrocytes from eel Anguilla anguilla, amberjack Seriola dumerili, toothcarp A. iberus and humans, and were Kanagawa-phenomenon-negative. Infectivity tests showed that the virulence for A. iberus was dependent on salinity. Finally, all strains were virulent for amberjack and eel.
61 citations
TL;DR: Age and growth of an Iberian cyprinodont, Aphanius iberus, in its most northerly population, La Rubina lagoon, was studied and the growth model of this species does not seem to fit types I and II of Sebens's classification, which are characteristic of fish.
Abstract: Age and growth of an Iberian cyprinodont, Aphanius iberus (Cuv. & Val.), in its most northerly population, La Rubina lagoon (Alt Emporda wetlands, NE Spain), was studied. The age groups for this Mediterranean population (O +, 1 + and 2 +) agree with those reported for the Atlantic population (R. Guadalquivir marshes), in the southern limit of the species distribution in the Iberian peninsula. Differences in age structure between these populations and the one previously studied in La Tancada lagoon (R. Ebro delta marshes) can be attributed to age estimation bias. Male A. iberus data appear to fit similarly to a Gompertz growth function and to a von Bertalanffy growth function, but Lx, was clearly underestimated. A Gompertz growth function was not a good fit for females, perhaps because female growth is clearly faster and less attenuated than male growth. The life history and growth pattern ofthis species is similar to that in other cyprinodontiform fishes, typified by a short longevity. The growth model of this species does not seem to fit types I and II of Sebens's classification, which are characteristic of fish.
49 citations
TL;DR: The biology of the Iberian toothcarp is characterized by fast growth, early maturity, high reproductive effort, multiple spawning and reduced longevity, which may be a good life strategy for small fish species in unstable environments, such as estuaries, where adult mortality is high, variable or unpredictable.
Abstract: The life-history pattern was studied of an endangered endemic cyprinodontid from the Iberian peninsula, Aphanius iberus (Cuvier & Valenciennes, 1846), found in a Mediterranean estuary, the Ebro delta. Maximum ages observed were 1 + in both sexes. The seasonal growth period started in March and continued until September. The females reached larger sizes than the males, as they have a higher rate of growth and live longer. The largest sizes found were 45 mm versus 38 mm. A. iberus is a multiple spawner that releases batches of eggs between May and August but with few eggs each time (varying from 10 to 30). Despite this continuous release of eggs two moments appeared to stand out as more important. After the reproduction period the parental cohort reduced drastically. The relationship between fecundity (F) and total length (mm) was represented by the formula: F = 8.358 x 10 -9 x L t 6.343 . The biology of the Iberian toothcarp is characterized by fast growth, early maturity, high reproductive effort, multiple spawning and reduced longevity. This may be a good life strategy for small fish species in unstable environments, such as estuaries, where adult mortality is high, variable or unpredictable. It allows them to exploit favourable environmental conditions, which occur in a specific, reduced period; practically all the population is renewed during this period.
39 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2018 | 1 |
| 2015 | 1 |
| 2014 | 1 |
| 2013 | 2 |