river changes…

Good Morning Barbara & Riverphiles,

open river mouth changes river life…

The rapid river mouth changes in the last week have been astounding. In my last report you read how the river was seeping into the San Lorenzo Blvd.Then the river mouth opened around mid-night from the 30th to the 31st. The 4’ high tide created a new look for a couple of days until the river mouth closed again. It is fascinating to see how these various waterscapes appeal to different bird species. The PELICANS cherish the short lived lagoon islands, which have been populated by 30 to 70 PELICANS. If endless grooming time allows, they waddle around, doze as picturesque statues until they take off in unison and fly a wide circle. Most of them land back on the resort island and a few decide on an ocean visit and are replaced by new comers. The ELEGANT and CASPIAN TERNS screech with fish-hunting joy when the river is lagoon-ing. They bomb-dive for fish, barely avoiding collision with each other and drive the fish stealing gulls berserk, who are in a frenzy, trying to decide which TERN to rob of their prey. The CORMORANTS and TERNS benefit from each others fishing styles: the CORMORANTS flush the swimmers upward, the diving TERNS flush the fish downward. Does anybody know if fish are deaf? The loud TERN screeches should warn the fish that quilled hunters are on the loose and dash instantly for the deeper cliff channels instead of staying in the middle of the lagoon, presenting easy targets. The Shorebirds such as prefer the open river mouth. In the early morning they carefully ‘graze‘ the waterline, make their way slowly past the river towards the Seabright beach, where early human risers and dogs cut their visit short. They fly off and don’t return until an other day.

Western Sandpipers ‘grazing’ at the river mouth…

It’s the time in the breeding season when the feathered parents have reached the limits of patiently responding to the incessant begging call of their brood. Now the brood’s ‘feed me’ call tends to get either a sporadic response or is totally ignored. Sunday morning a gull parent tried to escape the pesky offspring, who was obviously unwilling to grow up. This proved to be a quite difficult case of ‘kicking the young out of the nest’. The youngster followed the parent in the air, landed almost on top of its sire in the water, raced in the sand after the potential food source while screeching non stop. Finally the parent fled to the open sea and of course the peeved teenager followed. Plainly the young gull was no match for the progenitor’s speed: swiftly the gap between them widened. As you see, family issues are not species specific.

Pelicans enjoying new river island…

A couple of weeks ago I saw the Soquel bridge light installation in the evening. The different colored lights streamed back and forth in the dark. The art piece appeared for the EBB & FLOW festival and I thought it would stop once the event was over. The impact of the construction work for the installation had me already concerned for the SWALLOW nests underneath the bridge ledge. And now I am staring my concerns for the nocturnal, diurnal wildlife hunters in the eye. How are the moving lights effecting their nightly, twilight feeding? I know there are Owls, Hawks, Black-crowned Night Herons and Shorebirds along the river. They use the night, twilight for find food for their survival. In addition the San Lorenzo River is in the Pacific flyway of migratory birds, many of whom fly at night. Looks like it’s time to honor my wildlife concerns with some( whom am I kidding?always ‘much’) research and outreach work, which includes you all. Thanks for sharing your information how light across a waterbody effects nocturnal, diurnal hunters. The birds and I appreciate that!

light installation across the river…

Here is a little update for you: The COMMON GOLDENEYE and the RED-throated LOON are still residing on river between Laurel St bridge and river mouth. The amount of ELEGANT, CASPIAN TERNS, CORMORANTS and juv. HEERMANN’s gulls has been staggering at the river mouth/Trestle. The SPOTTED SANDPIPER is back between Trestle and Riverside Ave. bridge, where only a dozen or so CLIFF SWALLOWS remain. On Sat. 8/18th we’ll be working on our ongoing Restoration Project and we love to have you join us.
Sending you all sparkly river greetings, jane

Whimbrels by the river mouth…
Advertisements

7 thoughts on “river changes…

  1. Light also impacts the return of salmonids up-River since they do travel at night. Don Alley would have more information about the specifics. Let me know if you want me to get that for you.

    Thank you for your always moving and interesting writing… and wonderful photos.

    Best wishes,

    Nancy Macy >

    Like

    1. Hi Kim, the swallows were pretty inactive after the installation. Before the installation I saw more more flying around the bridge. Unfortunately there is no precise data available.

      Like

  2. There are so many invasive exotic specie of plants in the rivers! I know that they are out there, but just today, I noticed how much of the vegetation is comprised of the invasive exotics! I know that the wildlife adapts to most of it, but I still do not like it.

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s