Farallon Islands

Stormy Netting /  by Michael Johns

The wind has finally dropped and the moon is close to new; prime conditions for working the mist net. We've started a third round of Ashy Storm-petrel netting to put out more bands for a long-term mark-recapture study, and PIT tags for a graduate student's PhD work. Last night we opened the net just after 1030PM to a flurry of activity, catching 6 birds within minutes. Red filters on our headlamps help to minimize handling stress to the palm-sized seabirds, while we record wing chord, brood patch status, mass, and secure the band and tag. The pace slowed by the second hour, forcing us to quit an hour early due to a lack of activity. The night was slow, but the stars and a freak lightning show over San Fransisco kept things interesting until it was time to head back to the house.  

The Other Inhabitants /  by Michael Johns

Along with 13 species of breeding birds, the Farallones are used as a haul out and pupping site for 5 species of Pinnipeds. For those of you unfamiliar with the term, Pinnipeds are the "fin-footed" marine mammals, a taxonomic distinction that describes all of the seals, sea lions, and walrus. Northern Elephant Seals, Fur Seals, Steller Sea Lions, California Sea Lions, and Harbor Seals can all be seen in various numbers and reproductive stages on the island throughout the the year. They offer a visual reprieve from many hours of waiting for birds to stand off their nests and reveal what's brooding underneath. These two massive adult male Steller Sea Lions were occupying the same territory, and likely had just finished an epic battle that must have ended in a stalemate. True Chewbaccas of the sea. 

Eggs, So Many Eggs /  by Michael Johns

Common murres, pictured here, are some of the most devoted parents on the island. Although their mint green eggs are laid on precarious rocky cliff ledges, few are lost given intense parental care and attention. Tucked beneath soft breast feathers and wedged between a pair of webbed feet, common murre eggs withstand driving wind and harsh weather for roughly 28 days before a chick eventually emerges from within. We have been waiting and watching patiently from blinds above the colony for weeks now for this event to happen, with the first hatches scheduled to occur sometime in mid June. 

When Night Falls /  by Michael Johns

Somewhere between four and nine thousand ashy storm-petrels breed on Southeast Farallon Island, roughy half of the world's population. These sparrow-sized seabirds are tiny versions of more familiar open ocean wanderers like shearwaters and albatrosses, and like their relatives they brave extreme oceanic storms in a truly pelagic lifestyle. Ashy storm-petrels only arrive on colony after dusk and depart before dawn, and are almost never seen on island during the day. So in order to study this species, you have to forgo normal working hours and venture out into the field at night. During lulls in the spring winds, we head out just before 10PM to suitable storm-petrel breeding habitats and set up a long wall of fine mesh netting called a mist net. Calls of ashy storm-petrels are played with a loud speaking near the net to attract unsuspecting birds. Storm-petrels caught in the mist net are then measured, weighed, and banded with a small metal numeric leg band before being released; part of a mark-recapture study aimed to arrive at a more accurate estimate of the breeding population on the Farallones. Along with the joys of working with such an incredible seabird species, on clear nights we are also treated to a dazzling display of our own galaxy.