Sagebrush gall system — Oak gall system — Sierra Nevada natural history — Plant conservation in Nepal
Sagebrush gall system
Eutreta diana, female. Drawn by Devyn Orr.
Eutreta diana, female
Eutreta diana, thumb for scale
Mountain big sagebrush (Artemisia tridentata subsp vaseyana). Drawn by Devyn Orr.
Mountain big sagebrush (Artemisia tridentata subsp vaseyana)
The saw-like ovipositor that Eutreta diana uses to insert eggs into sagebrush stems. Note the sharp teeth!
Four mature Eutreta diana galls
A growing Eutreta diana gall
Eutreta diana gall
Eutreta diana pupa inside a dissected gall. Drawn by Devyn Orr.
The empty puparium left behind by an emerging Eutreta diana adult
Inquiline caterpillar making a mess out of a Eutreta diana gall. Drawn by Devyn Orr.
Ant (Formica sp.) chewing into a Eutreta diana gall. Drawn by Devyn Orr.
Parasitoid pupa inside dissected Eutreta diana gall. Drawn by Devyn Orr.
Parasitoid pupa inside dissected Eutreta diana gall. You can see the remains of the Eutreta diana pupa to the left of the parasitoid.
Pteromalys sp., a parasitoid of Eutreta diana. Drawn by Devyn Orr.
Sagebrush steppe at Valentine Eastern Sierra Reseve
“The Grandma Tree” at Valentine Eastern Sierra Reserve
Sierra Nevada Aquatic Research Lab
Building experimental cages over sagebrush
Building experimental cages
Introducing Eutreta diana adults to experimental cages
Experimental cages at Valentine Eastern Sierra Reserve
Counting galls in long-term study plot
Doing the fieldwork dance
Sampling sagebrush odor chemicals using solid phase microextraction and a gas chromatograph-mass spectrometer.
Sampling sagebrush odor compounds using dynamic headspace sampling
The army of sagebrush clones and half-sibs
The alpha gall hunter on the prowl
Testing preferences of female Eutreta diana to sagebrush plants that emit different odors
Testing the effect of conspecific density on female host-plant choice
Very rarely different galling species form galls so close on a stem that the galls grow together forming a gall chimera! The smooth purple top is from Eutreta diana. The hairy bottom is from Rhopalomyia medusirassa.
Oak gall system
EVE 180 after a fun day of sweep sampling arthropods on valley oak (Quercus lobata)
The california gall wasp (Andricus quercuscalifornicus) forms oak apple galls on valley oak (Quercus lobata)
Fresh and old (top) oak apple galls cut open.
Over half of oak apple galls during winter contain one or more jumping spider (Salticidae). The spiders move into the tunnels left behind by emerging gall wasps.
Valley oak with hundreds of past-season oak apple galls
Dissecting oak apple galls
Sierra Nevada natural history
Plant conservation in Nepal
Farmers in Eastern Nepal cultivate rare folk-medicinal plants on terrace walls between food crops. This practice provides many farmers with their first cash crop and reduces harvesting from wild populations of the plants.