Unfortunately there are none. You have three choices, it seems. You can either render your Bryce background as a movie and import it into the Poser animation (which works surprisingly well), or you can create 145 separate Bryce files and stitch the resulting images together with Moover. Or you could create your Poser animation in "blue screen" and stitch it to the Bryce work in something like Preview or After Effects or some other similar video editing software.