Growth and reproductive traits of diploid and triploid forms of the Squalius alburnoides cyprinid complex in a tributary of the Guadiana River, Portugal

Ribeiro, Filipe; Cowx, I. G.; Tiago, Patrícia; Filipe, Ana Filipa; Costa, L. Moreira Da; Collares‐Pereira, Maria João

doi:10.1127/0003-9136/2003/0156-0471

Cited by 24 publications

(32 citation statements)

References 20 publications

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“…In females, the abdomen shrinks after spawning and only gets swollen again after many days or weeks, when a female is ready to release a new batch of eggs (see Ribeiro et al 2003). This difference between females that are ready to spawn and those that have just spawned made us almost sure that successive observations very likely represented spawning events involving different females.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, the complex lives for the most part in Mediterranean rivers and streams, which in the spring and summer get almost entirely reduced to small pools where fish are forced to congregate, being retained there for many months. This population showed breeding cycles that coincided with the reproduction in the field (see Ribeiro et al 2003) and spawned spontaneously in 3 consecutive years.…”

Section: Methodsmentioning

confidence: 99%

“…The non-hybrid and hybrid males constitute two very distinct morphotypes, differing in size, morphology and ecological requirements (Collares-Pereira 1984;Martins et al 1998;Ribeiro et al 2003): non-hybrids are smaller than hybrids and the males of other sympatric Squalius species, and tend to prefer habitats characterized by shallow waters and higher temperatures, conditions that are typical of the rivers of south Iberia, when summer droughts reduce many streams to pools. In contrast, S. alburnoides females and other Squalius species show a preference for deeper waters and higher current velocities (Martins et al 1998;Pires et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive success of nuclear nonhybrid males of Squalius alburnoides hybridogenetic complex (Teleostei, Cyprinidae): an example of interplay between female choice and ecological pressures?

2006

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The hybridogenetic fish complex Squalius alburnoides comprises diploid males with non-hybrid nuclear genomes and several hybrid forms varying in ploidy and relative proportions of the parental genomes. In this paper, we present evidence that in captivity females prefer to mate with non-hybrid males. We suggest that female choice combined with different ecological requirements of hybrid and non-hybrid males may explain the extreme variation in the relative abundance of male types among drainages.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive success of nuclear nonhybrid males of Squalius alburnoides hybridogenetic complex (Teleostei, Cyprinidae): an example of interplay between female choice and ecological pressures?

2006

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“…Overall, offspring survival was higher in smaller egg batches, probably reflecting the influence of egg size on larval survival. Although no data on egg size was gathered for PAA females herein, females producing larger eggs are generally constrained to lay fewer eggs than females producing smaller ones [28]. Ultimately, this may lead to a higher survival of the offspring produced by the former females, because larvae hatching from larger eggs tend to be larger and more capable of resisting starvation and other environmental constraints [28].…”

Section: Discussionmentioning

confidence: 99%

“…This allowed all sorts of stimuli in the water to be shared among fishes, but breeding to occur only between mates in each compartment. Because S. alburnoides is a multiple bottom spawner [13,28], whose eggs stick to the substrate after fertilization, the holes were located on the top half of the acrylic plates, near the water surface, to prevent cross fertilization, and the bottom of each compartment was delimited by an acrylic net (1 cm 2 square holes) to avoid egg predation. Moreover, thin malleable acrylic sheets (0.5 mm) were put below the bottom nets, so that the stuck eggs of each batch could be removed through independent lateral compartments (10 cm width) without disturbing the mates.…”

Section: (C) Assessment Of the Offspring Produced In Directional Crossesmentioning

confidence: 99%

Reproductive dynamics shapes genomotype composition in an allopolyploid complex

et al. 2016

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Hybrid complexes are composed of organisms with multiple combinations of parental genomes (genomotypes) that interconnect through nets of crosses. Although several such complexes are well established without speciation or extinction, mechanisms shaping their dynamics remain poorly understood. In this study, we quantified the reproductive success of the allopolyploid Iberian fish Squalius alburnoides in experimental free-access and directional crosses involving the most common genomotypes. Specifically, we analysed the paternity of the offspring produced when females had free access to male genomotypes and quantified variations in egg allocation, fertilization rate, and offspring survival among crosses involving each male genomotype. The composition of the offspring produced from free-access crosses varied significantly from that expected from random mating, suggesting that offspring production and viability are not independent of parental male genomotype. Moreover, directional crosses producing the genomotype most commonly found in wild populations appeared to be the most successful, with females laying more eggs, and fertilization rate and offspring survival being the highest. These results suggest that reproductive dynamics plays a relevant role in structuring the genomotype composition of populations and opens a path to future research on the ecology and evolutionary biology of allopolyploids and their multiplicity of possible evolutionary pathways.

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Structural microhabitat use by endemic cyprinids in a Mediterranean‐type river: Implications for restoration practices

Santos

Rivaes

Boavida

et al. 2017

Aquatic Conservation

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1. Endemic freshwater fish from the Mediterranean region are among the most threatened species in the world owing to increasing river degradation. Because of such threats, the number of river restoration projects has greatly increased. However, they are seldom planned with consideration of the species' life history, often resulting in erroneous practices that compromise their success.2. This study assessed the seasonal and size-related microhabitat use by three endemic cyprinids (Iberian barbel, Luciobarbus bocagei; Iberian straight-mouth nase, Pseudochondrostoma polylepis;and calandino, Squalius alburnoides) using a modified point electrofishing procedure in a Mediterranean river. A multivariate approach was then employed to analyse both structural resource use and availability data.3. All species showed non-random microhabitat use. The barbel and nase shifted to fasterflowing positions (>25 cm s −1 ) with a coarser substratum (>150 mm particle size) during spring and to sheltered positions (50-100% instream cover) during autumn. Calandino selected more covered areas in autumn (>60% cover) and shifted to shallower positions from this season (>40 cm) to summer (<35 cm).4. Significant size-related differences in microhabitat use were consistent for the three species, with smaller individuals occupying on average shallower microhabitats. Significant resourceuse overlap between species size classes increased from autumn to summer, occurring mainly between juvenile and small adult barbel and calandino. 5. The present study helped develop recommendations for river restoration practices that may have a wider application, particularly for other Mediterranean-type rivers. Cover was found to be critical for all species, in particular for calandino, which could be classified as a shelter-oriented eurytopic species. Restoration scenarios should therefore consider maintaining cover habitats during unfavourable flow conditions for these species. Lithophilic spawners, which were highly responsive to velocity and substratum, could particularly benefit from the creation of gravel bedforms and artificial riffles to enhance depth and flow variability.

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Growth and reproductive traits of diploid and triploid forms of the Squalius alburnoides cyprinid complex in a tributary of the Guadiana River, Portugal

Cited by 24 publications

References 20 publications

Reproductive success of nuclear nonhybrid males of Squalius alburnoides hybridogenetic complex (Teleostei, Cyprinidae): an example of interplay between female choice and ecological pressures?

Reproductive success of nuclear nonhybrid males of Squalius alburnoides hybridogenetic complex (Teleostei, Cyprinidae): an example of interplay between female choice and ecological pressures?

Reproductive dynamics shapes genomotype composition in an allopolyploid complex

Structural microhabitat use by endemic cyprinids in a Mediterranean‐type river: Implications for restoration practices

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