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2017 update: Heritability of fitness–qGen2 & qGen3

Alex and Tracie search for juvenile Echinacea plants in experiments qGen2 & qGen3.

In 2017, we found 1006 three-year-old plants out of the 2526 original seedlings found in 2014 (we found 1724 plants in 2016) in the qGen2 cohort. In the qGen3 cohort we found 248 of the 644 seedlings.

The main goal of the qGen2 and qGen3 experiments is to quantify the evolutionary potential of two remnant prairie populations of Echinacea angustifolia by estimating the additive genetic variance of fitness. We make estimates for two mating scenarios. The first scenario is an experimental crossing design with all matings among plants from two “core” sites: SPP and LF (core x core). The second design uses sires (pollen donors) from the core and dams from sites peripheral to the core. The crosses performed (core x core, core x periphery) in this experiment will quantify additive genetic variance for fitness in each site and each experimental group. Additionally, we will test for differentiation among families; do progeny from sires differ after accounting for maternal (dam) effects?

Comparing germination and first year survival between the qGen2 & qGen3 cohorts:

exp approxFullAcheneCt totalAcheneCt seedlingCt germination firstYrSurvival
qGen2 6300 26144 2581 41% 84%
qGen3 6200 19777 644 10% 38%


Start year qGen3:
 2015

Start year qGen2: 2013

Location: The sires (pollen donors) are in the remnants Landfill and Staffanson. The dams (seed plants) are in exPt 1 and they originate from remnants. Specifically, the grand-dams (seed plants of dams) are from remnants Landfill (core) & around Landfill (peripheral) and remnants Staffanson (core) & railroad crossing sites (peripheral). All progeny are in exPt 8.

Overlaps with: Heritability of fitness–qGen1

Data collected: We used handheld computers to collect data on juvenile plants.

You can find more information about Heritability of fitness–qGen2 & qGen3 and links to previous flog posts regarding this experiment at the background page for the experiment.

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