Return of a giant: DNA from archival museum samples helps to identify a unique cutthroat trout lineage formerly thought to be extinct
Currently one small, native population of the culturally and ecologically important Lahontan cutthroat trout (Oncorhynchus clarkii henshawi, LCT, Federally listed) remains in the Truckee River watershed of northwestern Nevada and northeastern California. The majority of populations in this watershed were extirpated in the 1940s due to invasive species, overharvest, anthropogenic water consumption and changing precipitation regimes. In 1977, a population of cutthroat trout discovered in the Pilot Peak Mountains in the Bonneville basin of Utah, was putatively identified as the extirpated LCT lacustrine lineage native to Pyramid Lake in the Truckee River basin based on morphological and meristic characters. Our phylogenetic and Bayesian genotype clustering analyses of museum specimens collected from the large lakes (1872–1913) and contemporary samples collected from populations throughout the extant range provide evidence in support of a genetically distinct Truckee River basin origin for this population. Analysis of museum samples alone identified three distinct genotype clusters and historical connectivity among water bodies within the Truckee River basin. Baseline data from museum collections indicate that the extant Pilot Peak strain represents a remnant of the extirpated lacustrine lineage. Given the limitations on high-quality data when working with a sparse number of preserved museum samples, we acknowledge that, in the end, this may be a more complicated story. However, the paucity of remnant populations in the Truckee River watershed, in combination with data on the distribution of morphological, meristic and genetic data for Lahontan cutthroat trout, suggests that recovery strategies, particularly in the large lacustrine habitats should consider this lineage as an important part of the genetic legacy of this species.
[…] Analysis of molecular variance (AMOVA) and principal coordinates analysis (PCoA) were conducted in GenAlEx 6.5 [,]. We conducted AMOVA in order to characterize how genetic variation was partitioned within and among populations. PCoA was used to examine how genetic variation within the museum samples was distributed within the Truckee River watershed and to further examine the relationship between the Pilot Peak strain and the museum samples. [...] We constructed a number of phylogenetic trees using a Cavalli-Sforza distance metric and neighbour-joining tree building algorithm in the Populations 1.2.26 (1000 replications; ) and visualized in TreeView . Populations were grouped by river for a range-wide analysis, by contemporary and museum samples within the Truckee River analysis, and by museum sampling locations within the Truckee River watershed. […]
to analyse the site's operation and effectiveness, to display ads tailored to your interests
and to provide you with relevant promotional messages and other information about products,
events and services of ours or our sponsors and partner companies.
These cookies are needed for the site to work and to be optimized.
These cookies are needed to interact with the social network plugins on this site.
These cookies are used to track visitors across websites.
The intention is to display ads that are relevant and engaging for the users.
These cookies are needed in order to better understand how
this site is used and to improve the user experience.
At omicX, we believe trust is of the utmost importance. Transparency allows trust.
This is why we want you to understand what data we collect and how we use it.