San Francisco Peninsula

A California buckeye along the Peninsula is doing something it has no business doing in late August: it flowered on the 27th, pale pink-and-white spikes opening even as its own leaves color and drop and last spring's fruit hangs ripe on the same branches. Three life stages, all showing on one tree at once.To understand why that's strange, it helps to know how this species normally runs its year. Buckeye is usually the first tree on the Peninsula to leaf out each spring, often by February, and one of the first to shut down again, dropping leaves as early as July in a dry year. That early exit isn't decline, it's strategy. Most deciduous trees drop their leaves on a calendar cued by shortening days and falling temperatures, but buckeye is drought-deciduous: it reads soil moisture instead, and pulls the plug on photosynthesis before the dry Mediterranean summer can pull the water out of it by force. A tree that manages its own dormancy on that kind of internal trigger, rather than an external clock, is also a tree with more room to misfire, and an occasional stray environmental nudge can push it into throwing a second, out-of-cycle bloom well after its main season has closed.What makes this particular bloom worth watching is who showed up for it. An Anna's hummingbird was logged working the same stretch of Mission Creek today, and buckeye's tubular flowers are built almost exactly for that bird: long and narrow, favoring a hovering, long-billed visitor over a crawling insect. Unlike the ruby-throated and rufous hummingbirds that clear out of California by fall, Anna's hummingbird stays on the coast year-round, so a flowering buckeye in late August isn't dropping nectar into an empty season. There's a resident pollinator on the landscape to use exactly what it's offering.California buckeye carries no special conservation status, so none of this is a red flag. It's simply a small, precisely timed piece of plant physiology showing its hand on one tree, the kind of detail that only stands out because the buckeye's usual calendar is so well known.

Of the thousands of permitted dischargers tracked across the San Francisco Peninsula and Bay watershed this period, exactly one has landed on EPA's list of Significant Non-Compliance: the Treasure Island Wastewater Treatment Plant, which discharges directly into San Francisco Bay. That designation is EPA's own threshold for regulatory priority, reserved for violations judged serious enough in scale or duration to demand attention. The specific effluent parameters behind the listing weren't detailed in this pass, so the exact magnitude of the exceedance isn't clear, but standing alone on that list is itself the signal worth noting.The plant's troubles fit its known condition. It's aging, seismically vulnerable, and prone to combined-sewer-overflow risk whenever heavy rain overwhelms its capacity, which is precisely why it's now mid-construction on a $369 million federally financed rebuild. Water-quality gauges near Pier 17 and off Alcatraz's northeast shore currently read within normal late-summer ranges for temperature and dissolved oxygen, but with only three readings logged in the past month at each station, that record is far too sparse to say anything meaningful about conditions right at the outfall itself.Baykeeper tracks Bay pollution discharges and is a useful point of reference for anyone following this facility's compliance record as the rebuild moves forward.

Scarce Striped Grass-veneer (Ancylolomia tentaculella) turned up today in San Francisco County — a European moth that has been quietly establishing itself across California over recent decades. This is the first iNaturalist record within 50 kilometers in the past year, though the identification is still awaiting expert confirmation and may yet shift. The sighting makes ecological sense: this moth tracks disturbed, grass-heavy habitats—roadsides, parks, urban margins—which the peninsula offers in abundance.The larvae feed on grasses, and the species tends to slip in unnoticed until populations are already well-settled. Unlike flashier agricultural pests, Scarce Striped Grass-veneer moths rarely trigger alarm bells until ecosystem surveys catch them in the record. Worth flagging while the identification is still open, especially given how much of the habitat here is already shaped by human disturbance.

Humpback whales (Megaptera novaeangliae) are feeding in the waters just off the Peninsula right now — 44 occurrences recorded in the past two months mark this as the peak of their annual summer residency here. They arrive drawn by the cold, anchovy-rich upwelling that the California Current drives along this coast each summer, a seasonal pulse of abundance that Coastal Miwok and Ohlone peoples knew intimately across millennia of living alongside these waters.Unlike the gray whales seen foraging in the Bay this spring under conditions of ecological stress, humpbacks belong in these waters in July. The northeast Pacific population has recovered substantially since the end of commercial whaling, and their strong summer showing is one of the clearest signs that the offshore food web, for now, is still functioning.

California buckeyes across the Bay Area hills are dropping their leaves in July, their pale seed pods visible on naked branches while the oaks around them stay stubbornly green. On the same trees, you can see open flowers, mature fruits, and falling foliage all at once — a strange, unsettling combination that speaks to how this tree reads the calendar.For the California buckeye, summer drought is winter. Rather than exhaust its water reserves fighting through the dry months, it simply goes dormant now, shedding leaves and waiting in a state of suspended animation until the rains return in fall. This strategy has served the species through millennia of Mediterranean climate, but as dry seasons lengthen, it's a calculation worth watching.

Higher tides and persistent June winds are pushing water onto beaches already burdened by pathogen contamination—today's tidal gauge reads 0.118 meters above prediction, and Crissy Field, Aquatic Park, and Baker Beach all carry Clean Water Act impairment listings for unsafe bacterial levels. The broader pattern is sobering: eleven of sixteen water bodies within five miles of the shore now carry pathogen or other impairments.This represents a radical departure from the ecological baseline. The Ohlone people harvested and managed shellfish sustainably along this same coast for thousands of years, moving through seasons and places in ways that kept waters productive and clean. Today, the majority of nearby water bodies fail to meet federal standards for human use and aquatic life. The tides themselves—already shifting with climate and development—now carry pollution toward beaches that ought to be safe.

Gray whales are foraging in the Bay this June, a shift that reflects a much larger ecological stress taking hold across the Arctic. As warming reduces the prey fields where these animals have fed for millennia—amphipods and other benthic invertebrates on the far northern shelves—gray whales are moving into estuaries to root shallow mudflats closer to home. Their presence here is a sign of hunger, not abundance.What makes that worrying is the state of these waters. Eleven wastewater treatment plants across the Bay are currently in significant permit violation, including major facilities at North Point and Oceanside. The very mudflats the whales now depend on for forage are threatened by the nutrient loading and episodic contamination that drift down from these plants. Gray whales filtering amphipods from the bottom sediment are eating in an ecosystem already under stress from warming and now from regulatory failure.

Along the scrubby slopes and dry edges of San Francisco's South of Market open spaces, the orange bush monkeyflower is in full flower. The blooms are trumpet-shaped, two-lipped, and a deep burnt orange that holds its color even in the flat midday light. Each flower opens wide enough to admit a bee, and that is precisely what it is built for.The orange bush monkeyflower is a woody shrub native to California's coastal ranges and foothills, and it is well-suited to the dry, fog-cooled summers of this part of the city. It blooms through the longest days of the year, when soil moisture has dropped and most other plants have pulled back. The flowers are arranged so that a visiting bee, landing on the lower lip, is positioned directly beneath the anthers. Pollen falls onto the bee's back and thorax as it works its way toward the nectar at the base of the tube. The stigma, the part of the flower that receives pollen, is positioned near the entrance and is touch-sensitive: it closes within seconds of contact. This is a physical mechanism, not a slow process. When a bee brushes the stigma coming in, it closes. When the bee leaves and the stigma reopens, it is ready for pollen from the next visitor.Bumble bees are the primary pollinators here. They are large enough to make full contact with both the anthers and the stigma in a single visit, and they are strong fliers in the cool marine air that moves through San Francisco in summer. They visit the monkeyflower repeatedly across a foraging bout, carrying pollen from plant to plant. The bumble bee is not simply collecting; it is working. It grips the lower lip, pushes into the tube, and vibrates its flight muscles against the anthers to shake loose pollen, a behavior called buzz pollination. The sound is audible: a higher, shorter burst than the bee's normal flight tone. If you are near a flowering shrub right now, listen for it. It is distinct from the steady hum of a bee in flight.The monkeyflower offers both nectar and pollen to its visitors. Nectar fuels the bees directly. Pollen is gathered into the corbiculae, the pollen baskets on the bee's hind legs, and carried back to the colony to feed larvae. In return, the plant gets cross-pollination: pollen moved between individual plants, which increases genetic variation in the seed set. Neither species is doing the other a favor in any deliberate sense. The bee is feeding itself and its colony. The plant is structured to use that behavior. The relationship holds because both parties gain something from the same interaction.Coyote brush grows nearby, its young leaves bright and sticky in the summer heat. California blackberry is leafing out along wetter margins. These plants will support other pollinators later in the season, but right now the monkeyflower is the primary flowering resource in this dry scrub community. Bumble bee colonies are at or near their peak size in early summer, with the most foragers in the field. The overlap between colony demand and monkeyflower bloom is not coincidental: the bees follow available forage, and the monkeyflower's bloom window corresponds to the period of highest bee activity. Seaside buckwheat and California fuchsia will carry the late-summer nectar supply forward as the monkeyflower finishes, giving bumble bee colonies resources through the season until new queens disperse in fall.The scrub here sits within a dense urban area, and the patches where monkeyflower grows are small and discontinuous. Bumble bees range widely, sometimes more than a kilometer from the colony, so they can move between isolated patches. But the invasive fennel now established in parts of this area competes for the same dry disturbed ground the monkeyflower prefers, and poison hemlock has taken hold along some edges. Both are invasive species that reduce the area available for native flowering plants. The monkeyflower persists where it has space and sun.Stand near one of the shrubs for a moment. The flowers are at about waist height on most plants, and the orange is warm against the gray-green of the foliage. A bumble bee moves between them, unhurried and deliberate, pausing at each flower long enough to work it. Listen for that brief, higher buzz when it presses into the tube.

The fog lifts from the Golden Gate just enough to reveal the dark line where San Francisco Bay meets the Pacific. Out there, beyond the shipping lanes and beneath the surface chop, fin whales are feeding. These waters hold them through the long days of summer, when krill and small schooling fish gather in dense clouds along the continental shelf.A fin whale surfaces with barely a splash. Eighty feet long, it moves through the water column like a living current. The whale's throat pleats expand as it lunges forward, mouth open, engulfing thousands of gallons of seawater thick with prey. Then the pleats contract, forcing water through the baleen plates while tiny fish and crustaceans remain trapped inside. This is rorqual feeding, a technique that turns the whale's entire body into a filtering machine. The fin whale can take in more water relative to its body size than any other baleen whale, processing tons of prey-rich seawater in a single gulp.These summer waters off the Bay area support some of the most productive feeding grounds on the Pacific coast. Upwelling brings cold, nutrient-rich water from the deep ocean to the surface, fueling blooms of phytoplankton that feed the zooplankton that feed the fish that feed the whales. Fin whales follow this abundance, timing their presence here with the peak of the upwelling season. They feed primarily on northern anchovy, Pacific sardine, and euphausid shrimp. A single adult fin whale can consume up to four tons of prey each day during intensive feeding periods. The whales often feed cooperatively, working together to concentrate schools of fish or krill before lunging through them in coordinated attacks. Brown pelicans and Heermann's gulls gather above these feeding events, diving for the scattered fish that escape the whales' massive mouths. Brandt's cormorants join the feeding frenzy from below, pursuing fish driven toward the surface by the whales' movements. This creates a temporary community around each feeding event, linking the largest animals in these waters with some of the smallest seabirds.Listen for the sound of their breathing. A fin whale's blow carries across calm water as a sharp exhalation followed by a deep inhalation, audible from more than a mile away. Between breaths, they disappear for five to fifteen minutes, diving to depths where the summer light fades to blue-black and the pressure would crush any air-filled lung. Down there, they hunt by sound and feel, their lower jaws sensitive to the vibrations of schooling fish. When you hear that distant whoosh of breath, you are listening to an animal that has just returned from a world we can barely imagine, carrying the deep ocean back to the surface in its blood and lungs.

The sound comes first in San Francisco's neighborhoods: sharp calls cutting through the morning air, a conversation in a language that doesn't belong. Red-masked Parakeets (Psittacara erythrogenys) have claimed the city's canopy. Their green bodies flash between the branches of California live oaks (Quercus agrifolia) and black elderberry (Sambucus nigra), beaks working at seeds and flowers with the precision of birds who know exactly what they want.These invasive parrots arrived as escaped pets decades ago and stayed to raise families. Now they move through the urban forest in flocks of twenty or thirty, their red-masked faces bright against the spring foliage. Watch them work the elderberry flowers, their strong beaks dismantling the creamy clusters that native birds approach more delicately. The parakeets hang upside down from branches, twisting their necks to reach seed heads, their feet gripping with the confidence of birds who evolved in similar forests half a world away.The timing matters. Late spring brings the city's trees into full production, and the parakeets have learned the schedule. They strip seeds from the developing elderberry fruits before they ripen, taking resources that California Scrub-Jays (Aphelocoma californica) and House Finches (Haemorhous mexicanus) might otherwise claim. But the relationship isn't simply competitive. The parakeets are messy eaters, dropping partially consumed seeds and fruit pulp that feeds ground-dwelling birds and insects. Their aggressive foraging breaks open tough seed cases that smaller native birds cannot handle, creating access to nutrients that might otherwise remain locked away. They've become both competitors and inadvertent providers in the urban ecosystem.The live oaks present a different challenge. These native trees produce acorns in fall, but their spring flowers offer pollen and nectar that the parakeets harvest with systematic efficiency. They work methodically through the canopy, their calls maintaining contact with the flock as they move. The Acorn Woodpeckers (Melanerpes formicivorus) that depend on these same trees watch from nearby perches, waiting for their turn. The parakeets' presence has forced native species to adjust their foraging patterns, feeding earlier in the morning or later in the evening when the flocks have moved on.Listen for their calls now, wherever you are. The parakeets announce themselves before they appear, their voices carrying across blocks. If you're near trees beginning to fruit or flower, you might catch the flash of green and red as they work the branches above you. Their success in San Francisco's urban forest reminds us that ecosystems are never static. Even invasive species become part of the web, creating new relationships as they settle into a place that was never meant to hold them.