Effects of flow regulation along longitudinal gradient on size-related metrics of fish populations from a Mediterranean basin

Amat-Trigo, Fátima; Torralva, Mar; Sánchez-Pérez, Ana; Ruiz‐Navarro, Ana; Oliva‐Paterna, Francisco J.

doi:10.29094/fishmed.2016.010

Cited by 1 publication

(2 citation statements)

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“…Sampling sites placed in areas with the most natural flow regime (e.g., MU01 and SE01; Figure 1) were characterized by a strong seasonal variation, alternating summer droughts and spring/autumn short-time flow peaks (Figure 2a). An impact gradient on the natural flow regime in the study area was described by Amat-Trigo [35] and Amat-Trigo et al [36]. Impacted areas exhibit a seasonal inversion of the natural flow pattern (high flow levels in spring and summer, low flow levels in autumn and winter) due to the water demand for agricultural practices.…”

Section: Study Area and Sampling Designmentioning

confidence: 85%

“…The Segura River basin is located in the southeast of the Iberian Peninsula and is characterized by a marked environmental variability and displays a wide variety of human impacts along its longitudinal gradient [33,34]. Furthermore, this basin shows a welldocumented range of impacts on the natural flow regime [35,36] and is considered one of the most regulated Mediterranean river systems [37]. Therefore, the Segura River offers an opportunity to study the effect of multiple human-induced stressors along an intensively altered basin.…”

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: Study Area and Sampling Designmentioning

confidence: 85%