Bioenergetic models of the threatened darter<i>Percilia irwini</i>

García, Alex; Sobenes, Catterina; Link, Óscar; Habit, Evelyn

doi:10.1080/10236244.2012.668283

Cited by 11 publications

(12 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although P. irwini exhibits low swimming capacity and is unlikely to swim for long periods of time (García et al, 2012), our results provide evidence that P. irwini is capable of dispersing in both the upstream and downstream direction in areas unaffected by natural or anthropogenic barriers, but when these are present, dispersal occurs only in the downstream direction. Contemporary migration rates were relatively high in the downstream direction in the lower reaches of the Laja and Biobío rivers, and they were significant and high in both directions between the two groups in the Renaico-Malleco River ( Figure 5).…”

Section: Influence Of Natural Factorsmentioning

confidence: 67%

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Valenzuela‐Aguayo

McCracken

Manosalva

et al. 2019

Evolutionary Applications

Self Cite

View full text Add to dashboard Cite

An understanding of how genetic variability is distributed in space is fundamental for the conservation and maintenance of diversity in spatially fragmented and vulnerable populations. While fragmentation can occur from natural barriers, it can also be exacerbated by anthropogenic activities such as hydroelectric power plant development. Whatever the source, fragmentation can have significant ecological effects, including disruptions of migratory processes and gene flow among populations. In Chile, the Biobío River basin exhibits a high degree of habitat fragmentation due to the numerous hydroelectric power plants in operation, the number of which is expected to increase following new renewable energy use strategies. Here, we assessed the effects of different kinds of barriers on the genetic structure of the endemic freshwater fish Percilia irwini, knowledge that is critically needed to inform conservation strategies in light of current and anticipated further fragmentation initiatives in the system. We identified eight genetic units throughout the entire Biobío system with high effective sizes. A reduced effective size estimate was, however, observed in a single population located between two impassable barriers. Both natural waterfalls and human‐made dams were important drivers of population differentiation in this system; however, dams affect genetic diversity differentially depending on their mode of operation. Evidence of population extirpation was found in two river stretches limited by upstream and downstream dams. Significant gene flow in both directions was found among populations not separated by natural or anthropogenic barriers. Our results suggest a significant vulnerability of P. irwini populations to future dam development and demonstrate the importance of studying basin‐wide data sets with genetic metrics to understand the strength and direction of anthropogenic impacts on fish populations.

show abstract

Section: Influence Of Natural Factorsmentioning

confidence: 67%

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Valenzuela‐Aguayo

McCracken

Manosalva

et al. 2019

Evolutionary Applications

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fish were kept for at least 15 days before experiments. Fish were fed ad libitum with live prey (macroinvertebrates from streams and Enchitrea sp., Tenebrio molitor, and Eisenia foetida) three or four times a week according to Sobenes et al (2012) and García et al (2012). Following Jobling (1982) feeding was interrupted 48 h before each experiment.…”

Section: Capture and Maintenancementioning

confidence: 99%

Hydropower Development, Riverine Connectivity, and Non-sport Fish Species: criteria for Hydraulic Design of Fishways

et al. 2016

View full text Add to dashboard Cite

Hydropower barriers are among the most conspicuous anthropogenic alterations to natural riverine connectivity, resulting in species-specific effects linked to dispersal abilities, especially swimming performance. They may present a particular problem for small-bodied 'non-sport fish', such as those that characterize the freshwater communities of temperate regions in the Southern Hemisphere. Recent studies have suggested that nature-like fishways could ensure passage of diverse fish assemblages through hydropower barriers. Through experiments performed in a swim tunnel, we present, for the first time, fishway design criteria for two non-sport species endemic to Chile, a country experiencing rapid hydropower development. In`cremental velocity tests showed that Cheirodon galusdae and juveniles of Basilichthys microlepidotus were capable of very similar standardized critical swimming speeds of 69.7 and 69.6 cm s À1 , respectively. When expressed in units of body lengths, C. galusdae was capable of very high critical speeds of 16.2 bl s À1, whereas for B. microlepidotus, this was 7.6 bl s À1 . However, fixed velocity tests revealed that the swimming endurance of the latter species was slightly higher. Dimensionless analysis showed a clear relationship between fatigue time and fish Froude number, similar to that already described for subcarangiforms. Based on these results, we present fishway design curves indicating a transition from sustained to prolonged swimming at a fishway length of 15 m. Our results show that the swimming capacity of these species is well-suited to the mean flow velocity field described for nature-like fishways. However, more work is required to understand the effects of turbulence on the passage of non-sport species.

show abstract

“…Ordination showed that the mesohabitats of each bank had similar environmental characteristics, supporting the latter hypothesis. Furthermore, the low swimming capacity of many native species would render them vulnerable to isolation because of the width of the channel and the higher velocities found along the thalweg (García et al, 2012b;Sobenes et al, 2013b). More research into the swimming capacity and dispersal behaviour of these species is required in order to evaluate these hypotheses.…”

Section: Discussionmentioning

confidence: 99%

A Community-Level, Mesoscale Analysis of Fish Assemblage Structure in Shoreline Habitats of a Large River Using Multivariate Regression Trees

et al. 2015

View full text Add to dashboard Cite

The mesoscale (100–102 m) of river habitats has been identified as the scale that simultaneously offers insights into ecological structure and falls within the practical bounds of river management. Mesoscale habitat (mesohabitat) classifications for relatively large rivers, however, are underdeveloped compared with those produced for smaller streams. Approaches to habitat modelling have traditionally focused on individual species or proceeded on a species‐by‐species basis. This is particularly problematic in larger rivers where the effects of biological interactions are more complex and intense. Community‐level approaches can rapidly model many species simultaneously, thereby integrating the effects of biological interactions while providing information on the relative importance of environmental variables in structuring the community. One such community‐level approach, multivariate regression trees, was applied in order to determine the relative influences of abiotic factors on fish assemblages within shoreline mesohabitats of San Pedro River, Chile, and to define reference communities prior to the planned construction of a hydroelectric power plant. Flow depth, bank materials and the availability of riparian and instream cover, including woody debris, were the main variables driving differences between the assemblages. Species strongly indicative of distinctive mesohabitat types included the endemic Galaxias platei. Among other outcomes, the results provide information on the impact of non‐native salmonids on river‐dwelling Galaxias platei, suggesting a degree of habitat segregation between these taxa based on flow depth. The results support the use of the mesohabitat concept in large, relatively pristine river systems, and they represent a basis for assessing the impact of any future hydroelectric power plant construction and operation. By combing community classifications with simple sets of environmental rules, the multivariate regression trees produced can be used to predict the community structure of any mesohabitat along the reach. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Bioenergetic models of the threatened darterPercilia irwini

Cited by 11 publications

References 35 publications

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Human‐induced habitat fragmentation effects on connectivity, diversity, and population persistence of an endemic fish, Percilia irwini, in the Biobío River basin (Chile)

Hydropower Development, Riverine Connectivity, and Non-sport Fish Species: criteria for Hydraulic Design of Fishways

A Community-Level, Mesoscale Analysis of Fish Assemblage Structure in Shoreline Habitats of a Large River Using Multivariate Regression Trees

Contact Info

Product

Resources

About