Functional response of fish assemblage to multiple stressors in a highly regulated Mediterranean river system

Sánchez-Pérez, Ana; Oliva‐Paterna, Francisco J.; Colin, Nicole; Torralva, Mar; Górski, Konrad

doi:10.1016/j.scitotenv.2020.138989

Cited by 20 publications

(16 citation statements)

References 65 publications

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“…The Segura River basin shows a strong influence of human alterations mainly related to agricultural supply [33,37]. Agricultural practices involve strong hydraulic management that results in a loss of connectivity (habitat fragmentation), flow regime alteration and water quality and habitat degradation and encourages the establishment of non-native fish species [18,32,82,83]. Our results show the interplay between environmental stress factors, mostly those related to flow regulation, and the longitudinal gradient in some biological traits such as size and somatic condition.…”

Section: Discussionmentioning

confidence: 73%

“…In addition, there is a wide variety of human impacts present in the study area that were not considered in this study. For example, pollution could be driving the response of L. sclateri to environmental conditions [32], or predatory mammals (Lutra lutra), whose predation on L. sclateri in the Segura River basin was recently confirmed [104].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, flow management infrastructures cause loss of connectivity and habitat alterations related to the fragmentation process (e.g., increase in lentic habitats, changes in water quality), which could facilitate the establishment and spread of non-native fish species, altering the composition of the community [28,29]. However, the effects of these stress factors have been poorly studied in Mediterranean rivers [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Variability in Population Traits of a Sentinel Iberian Fish in a Highly Modified Mediterranean-Type River

Sánchez-Pérez

Paterna

Amat-Trigo

et al. 2021

Water

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Human pressures on water resources have been suggested as a driver of biological traits that induce changes in native fish populations. This study highlighted the interplay between environmental stress factors, mostly related to flow regulation, and the longitudinal river gradient in biological traits such as the growth, size structure and somatic condition of a sentinel fish, Luciobarbus sclateri. We found an increase in size-related metrics and somatic condition at population levels associated with downstream reaches, although fragmentation and habitat alteration, flow regime alteration and the abundance of non-native fish were also significantly involved in their variability. Age-related parameters and growth were only explained by flow regime alterations and the abundance of non-native fish species. The high plasticity observed in L. sclateri population traits suggests that this is a key factor in the species adaptability to resist in a strongly altered Mediterranean river basin. However, the interplay of multiple stressors plays an important role in fish population dynamics and could induce complex responses that may be essential for long-term monitoring in sentinel species.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability in Population Traits of a Sentinel Iberian Fish in a Highly Modified Mediterranean-Type River

Sánchez-Pérez

Paterna

Amat-Trigo

et al. 2021

Water

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“…However, high TD and PD in an impounded reservoir do not necessarily support high FD in the long run. For example, an increase in species richness and abundance but decrease in functional diversity was observed in the Segura River in southern Spain (Sanchez‐Perez et al., 2020 ). In the upstream of the dam after the formation of a reservoir, the rise of water depth stratifies dissolved oxygen because of a vertical water pressure gradient.…”

Section: Discussionmentioning

confidence: 99%

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Deng

Huang

et al. 2021

Ecology and Evolution

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“…The Segura River Basin is characterised by a typical Mediterranean climate with a pronounced spatial and seasonal hydrological variability. Currently, this basin is highly regulated in terms of irrigation supply and human water demands, which have greatly modified the natural flow regime, resulting in changes in flow magnitude and a reverse seasonal flow pattern in some areas [42,43]. Supplementary Material 1 provides an accurate description about the flow regime characteristics of the sampled streams.…”

Section: Study Areamentioning

confidence: 99%

Plasticity in Reproductive Traits, Condition and Energy Allocation of the Non-Native Pyrenean Gudgeon Gobio lozanoi in a Highly Regulated Mediterranean River Basin

Amat-Trigo

Torralva

González-Silvera

et al. 2021

Water

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The invasion success of non-native fish, such as Pyrenean gudgeon Gobio lozanoi in several Iberian rivers, is often explained by the expression of its life history traits. This study provides the first insights into the reproductive traits, fish condition, and energy allocation (protein and lipid contents of tissues) of this species, along a longitudinal gradient in one of the most regulated river basins in the Iberian Peninsula, the Segura river. Larger sizes of first maturity, higher fecundity and larger oocytes were found in fluvial sectors with the most natural flow regimes, characterised by a low base flow with high flow peaks in spring and autumn. A delay in the reproductive period, lower fish condition and no differences in sex-ratio were observed in fluvial sectors with a high increase in base flow and notable inversion in the seasonal pattern of flow regime. Lipid contents in the liver and gonads were stable during the reproductive cycle and decreases in muscle were noted, whereas ovarian and liver proteins increased. In relation to energy allocation for G. lozanoi, an intermediate energy strategy was observed between income and capital breeding. Our results support the hypothesis that the high plasticity of G. lozanoi population traits plays a significant role in its success in a highly regulated Mediterranean river basin. Understanding the mechanisms by which flow regulation shapes fish populations in Mediterranean type-rivers could inform management actions.

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Functional response of fish assemblage to multiple stressors in a highly regulated Mediterranean river system

Cited by 20 publications

References 65 publications

Variability in Population Traits of a Sentinel Iberian Fish in a Highly Modified Mediterranean-Type River

Variability in Population Traits of a Sentinel Iberian Fish in a Highly Modified Mediterranean-Type River

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Plasticity in Reproductive Traits, Condition and Energy Allocation of the Non-Native Pyrenean Gudgeon Gobio lozanoi in a Highly Regulated Mediterranean River Basin

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