Variation of the use of marine resources by Galaxias maculatus in large Chilean rivers

Górski, Konrad; Habit, Evelyn; Pingram, Michael A.; Manosalva, Aliro

doi:10.1007/s10750-015-2542-4

Cited by 33 publications

(42 citation statements)

References 55 publications

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“…Based on our results and the stable isotope analyses in Górski et al () of a subset of our samples, we have shown that diadromous and residents individuals can be found in sympatry, and the clearest example in our study is the resident population from the Puelo River (PueRes), where nearly 50% of the individuals were assigned genetically to the diadromous group. Stable isotope analyses also suggested that Toltén and Valdivia estuarine populations have diadromous and resident individuals, yet our genetic analyses with a limited number of individuals found only diadromous individuals in Toltén and the most estuarine location in the Valdivia River (ValEst 1 ) and only resident individuals in the second (upstream) estuarine location in the Valdivia River (ValEst 2 ).…”

Section: Discussionsupporting

confidence: 69%

“…Estuarine collections exhibited high levels of genetic diversity and low levels of genetic structure as expected from the fact that most individuals collected in the estuaries were indeed diadromous as assessed by analyses of stable isotopes in bone tissue (Górski et al, ). Resident populations, instead, exhibited relatively low levels of genetic diversity, and the northernmost resident populations were more highly differentiated from each other than the resident populations from locations in the southern part of the species' range in Chile.…”

Section: Discussionmentioning

confidence: 99%

“…Estuarine collections, which generally comprised diadromous individuals as assessed by their bone tissue isotopic composition (Górski et al, ), showed higher levels of genetic diversity than resident populations. Diadromy is the ancestral trait of G. maculatus , and individuals have been found up to 700 km from the coast (McDowall, Robertson, & Saito, ).…”

Section: Discussionmentioning

confidence: 99%

“…Although ValEst 2 is located <35 km from the ocean, it was considered an estuarine relative to the resident locations (ValRes) that are located >150 km from the ocean. Stable isotope data, which can be used as an indication of the environment experienced by the individuals, were available for 15 locations (Górski et al, ). In particular, the sulphur isotope ratio (34S to 32 S) in bone tissue samples, which is expected to differ between the marine and freshwater environments (Peterson & Fry, ), confirmed that most estuarine collections comprised diadromous individuals, whereas most resident collections comprised individuals that showed no trace of migration to seawater (Górski et al, ).…”

Section: Methodsmentioning

confidence: 99%

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The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

et al. 2019

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Understanding the evolutionary mechanisms that affect the genetic divergence between diadromous and resident populations across heterogeneous environments is a challenging task. While diadromy may promote gene flow leading to a lack of genetic differentiation among populations, resident populations tend to be affected by local adaptation and/or plasticity. Studies on these effects on genomic divergence in nonmodel amphidromous species are scarce. Galaxias maculatus, one of the most widespread fish species in the Southern Hemisphere, exhibits two life histories, an ancestral diadromous, specifically, amphidromous form, and a derived freshwater resident form. We examined the genetic diversity and divergence among 20 estuarine and resident populations across the Chilean distribution of G. maculatus and assessed the extent to which selection is involved in the differentiation among resident populations. We obtained nearly 4,400 SNP markers using a RADcap approach for 224 individuals. As expected, collections from estuarine locations typically consist of diadromous individuals. Diadromous populations are highly differentiated from their resident counterparts by both neutral and putative adaptive markers. While diadromous populations exhibit high gene flow and lack site fidelity, resident populations appear to be the product of different colonization events with relatively low genetic diversity and varying levels of gene flow. In particular, the northernmost resident populations were clearly genetically distinct and reproductively isolated from each other suggesting local adaptation. Our study provides insights into the role of life history differences in the maintenance of genetic diversity and the importance of genetic divergence in species evolution.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

et al. 2019

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“…Further, an innovative approach to the past and current conditions of fish and fisheries as well as the legal management framework of the two rivers is provided. Górski et al (2015) performed a first approach to the study of the use of marine resources by riverine populations of Galaxias maculatus (Jenyns) in Chile, across an extended latitudinal gradient and to ocean distance. Through the analysis of the concentration of d34S in vertebral column tissue from fish collected in ten Chilean river systems across latitudes 36°-47°S, the authors detected that all fish caught in the estuary have higher values, corresponding to the use of marine resources.…”

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confidence: 99%

Preface: Multifunctionality of large rivers

2018

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To sea or not to sea? Multiple lines of evidence reveal the contribution of non‐diadromous recruitment for supporting endemic fish populations within New Zealand's longest river

David

Jarvis

Özkundakci

et al. 2019

Aquatic Conservation

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1. Otolith microchemistry was used to identify marine-versus freshwater-derived recruitment of three native freshwater fish species belonging to the southern hemisphere family Galaxiidae, in New Zealand's longest river system, the Waikato River.2. Water chemistry data for trace elements and 87 Sr/ 86 Sr isotope ratios were collected from five lentic and 10 lotic water bodies throughout the lower river floodplain. Potential spawning sites for galaxiids were compared with values obtained by laser ablation inductively coupled mass spectrometry (LA-ICPMS) depth profiling of young-of-the-year otoliths sampled from fish in nine lower river catchment sites.3. Otolith chemical signatures from the larval rearing period indicated that catchmentscale recruitment for two species, Galaxias argenteus (Gmelin, 1789) and Galaxias fasciatus Gray, 1842, was driven predominantly by non-diadromous recruitment from one lake (Lake Waahi). In contrast, diadromous recruitment appeared to be more common for Galaxias maculatus (Jenyns, 1842); however, non-diadromous specimens were also identified for the first time from a New Zealand river. 4. Reversing lake outlet flows linked to river stage appears be important in facilitating the dispersal of rheotactic larvae out of lakes, suggesting that lake outflow management at key times could be used to sustain this ecologically important function.5. This study highlights that some water bodies can supply a disproportionately large number of recruits to support fish populations within the wider riverscape. Identifying these water bodies and managing them to sustain recruitment is key to the conservation of non-diadromous Galaxiidae in this modified lowland environment

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Variation of the use of marine resources by Galaxias maculatus in large Chilean rivers

Cited by 33 publications

References 55 publications

The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

The effects of diadromy and its loss on genomic divergence: The case of amphidromous Galaxias maculatus populations

Preface: Multifunctionality of large rivers

To sea or not to sea? Multiple lines of evidence reveal the contribution of non‐diadromous recruitment for supporting endemic fish populations within New Zealand's longest river

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