Chinook salmon (Oncorhynchus tshawytscha, Walbaum 1792) in the Beagle Channel, Tierra del Fuego: the onset of an invasion

Fernández, Daniel A.; Ciancio, Javier; Ceballos, Santiago; Riva-Rossi, Carla; Pascual, Miguel

doi:10.1007/s10530-010-9731-x

Cited by 25 publications

(19 citation statements)

References 13 publications

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“…The low temporal resolution of sedimentary eDNA may be appropriate for conservation programs that can use information about current-or-past occupancy, such as retrospective genetic monitoring (Schwartz et al, 2007) of aquatic macrofauna for spatial distribution and historical range studies concerned with long-term site occupancy (Fernández et al, 2010;Provan et al, 2008;Wandeler et al, 2007). The abundance and persistence of sedimentary eDNA could benefit monitoring for species introductions or range shifts where the target species has no prior occupancy (Tréguier et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Fish environmental DNA is more concentrated in aquatic sediments than surface water

Turner

Everhart

2015

Biological Conservation

397

456

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a b s t r a c tGenetic identification of aqueous environmental DNA (eDNA) provides site occupancy inferences for rare aquatic macrofauna that are often easier to obtain than direct observations of organisms. This relative ease makes eDNA sampling a valuable tool for conservation biology. Research on the origin, state, transport, and fate of eDNA shed by aquatic macrofauna is needed to describe the spatiotemporal context for eDNA-based occupancy inferences and to guide eDNA sampling design. We tested the hypothesis that eDNA is more concentrated in surficial sediments than in surface water by measuring the concentration of aqueous and sedimentary eDNA from an invasive fish, bigheaded Asian carp (Hypophthalmichthys spp.), in experimental ponds and natural rivers. We modified a simple, low-cost DNA extraction method to yield inhibitor-free eDNA from both sediment and water samples. Carp eDNA was 8-1800 times more concentrated per gram of sediment than per milliliter of water and was detected in sediments up to 132 days after carp removal -five times longer than any previous reports of macrobial eDNA persistence in water. These results may be explained by particle settling and/or retarded degradation of sedimentadsorbed DNA molecules. Compared to aqueous eDNA, sedimentary eDNA could provide a more abundant and longer-lasting source of genetic material for inferring current-or-past site occupancy by aquatic macrofauna, particularly benthic species. However, resuspension and transport of sedimentary eDNA could complicate the spatiotemporal inferences from surface water sampling, which is currently the predominant eDNA-based approach. We discuss these implications in the context of conservation-oriented monitoring in aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Fish environmental DNA is more concentrated in aquatic sediments than surface water

Turner

Everhart

2015

Biological Conservation

397

456

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“…comm.) and introduced salmonids like Oncorhynchus tshawytscha (Fernández et al 2010;Riva Rossi et al 2012). The presence of numerous juveniles of E. maclovinus in the Lapataia estuarine zone highlights the importance of this area for this species, which is probably used as a nursery.…”

Section: Introductionmentioning

confidence: 99%

Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

et al. 2016

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Salinity is one of the most important structuring factors in the distribution and bioenergetics of estuarine fishes. The aims of this work were to study the distribution of the sub-Antarctic, eurythermic, euryhaline and coastal notothenioid Eleginops maclovinus in Lapataia estuary (Tierra del Fuego National Park), in relation to salinity conditions, and the effect of salinity on the oxygen consumption of this species. The spread of the mixing zone of Lapataia was studied and physicochemical properties (conductivity, pH, temperature and salinity) were measured. Distribution of E. maclovinus juveniles was investigated principally by electrofishing in the field. Oxygen consumption of absorptive and post-absorptive young-ofthe-year individuals (8-10 cm total length) was analyzed by stop-flow respirometry measurements, performed at three salinities (1, 12 and 30 psu). The intermediate mixing zone is relatively small in this system, showing an extension of *1.5 km upstream from Lapataia Bay. It was found that there was a strong relationship between the mixing zone and the distribution of juveniles of E. maclovinus. No differences were found in the metabolic baseline at different salinities. A punctual feeding provoked a typical SDA response, with a significant higher ingested food and metabolic scope at intermediate salinity (12 psu). An increased scope was reached by increasing the energy intake and not through a decrease in the standard metabolic rate. Under an available food condition, this capacity could result in an increased growth rate at intermediate salinity.

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“…Feral freshwater salmonid populations have been introduced in several river basins around the world, but most worldwide attempts to establish anadromous populations have failed (Pascual & Ciancio, ). Anadromous O. mykiss and anadromous Salmo trutta L. 1758, however, successfully established in Atlantic Patagonian basins and O. tshawytscha , introduced in Chilean Patagonia only 30 years ago, are establishing populations in virtually all the main Pacific river basins and in some of the southernmost Atlantic river basins (Ciancio et al ., ; Correa & Gross, ; Fernandez et al ., ; Riva Rossi et al ., ) (Fig. ).…”

Section: Anadromous Salmonidsmentioning

confidence: 99%

Freshwater fishes of Patagonia: conservation and fisheries

Cussac

Habit

Ciancio

et al. 2016

Journal of Fish Biology

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The absence of much literature on the Patagonian fish fauna in comparison with that of the neotropics, has previously been blamed on its poor species diversity. Knowledge of the fishes of Patagonia, however, rose sharply at the beginning of the present century, allowing for an understanding of the complex biogeographical history that has led to the present diversity and distribution patterns. There are several new and potential threats to biodiversity and conservation of Patagonian fishes, such as the introduction of exotic species, damming, climate change and changes geared to safeguard economic interests, often acting synergistically. A great amount of new information is now available and the aim of the present review is to articulate this knowledge in a comprehensive way in order to aid in the development of tools to face the increasing challenges posed by environmental change and human activity. Knowledge about fishes of Patagonia has grown at the same time as human actions, and presence.

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Chinook salmon (Oncorhynchus tshawytscha, Walbaum 1792) in the Beagle Channel, Tierra del Fuego: the onset of an invasion

Abstract: In this paper we provide the first report of

Cited by 25 publications

References 13 publications

Fish environmental DNA is more concentrated in aquatic sediments than surface water

Fish environmental DNA is more concentrated in aquatic sediments than surface water

Effects of changes in salinity on oxygen and food consumption of the young sub-Antarctic notothenioid Eleginops maclovinus: possible implications of their use of an estuarine habitat

Freshwater fishes of Patagonia: conservation and fisheries

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