Storers Auklet
Aethia storeri
Order: Charadriiformes / Family: Alcidae
Wikimedia Commons
About the Storers Auklet
The Storers Auklet, also known as Aethia storeri, is a captivating seabird species found primarily in the North Pacific Ocean. This bird is an integral part of the marine ecosystem, acting as both predator and prey within its environment. Storers Auklets are particularly notable for their dense breeding colonies on isolated and often inaccessible islands, such as those in the Aleutian chain and parts of the Commander Islands. These colonies can number in the tens of thousands, creating a bustling community that is both a spectacle and a critical component of the local biodiversity. Their presence in these regions indicates healthy marine systems, as they rely heavily on abundant small marine organisms such as krill and copepods.
Storers Auklets play a significant ecological role, particularly in nutrient cycling. By feeding on marine zooplankton and returning to the land to breed, they transport significant quantities of oceanic nutrients back to terrestrial environments. This process enriches the nutrient-poor soils of their breeding islands, promoting plant growth and supporting other wildlife. Such nutrient transfer is especially crucial in the nutrient-scarce environments of the islands they inhabit.
Seasonally, the Auklet exhibits distinct behaviors. During the breeding season, they congregate in immense numbers at their nesting sites, engaging in social interactions and courtship rituals. Outside of the breeding period, they lead a pelagic lifestyle, spending much of their time at sea on the open water. Their movements and behaviors during this time are less understood due to the vastness of their marine habitat and the difficulties of studying birds at sea. Nevertheless, it is known that they exhibit some degree of local movement driven by prey availability and weather conditions. Understanding these seasonal patterns is key to conserving the species, as changes in oceanic conditions could significantly impact their survival.
The Storers Auklet belongs to the family Alcidae, within the order Charadriiformes. These birds typically live 10-15 years, with a max recorded of 20 years.
How to Identify a Storers Auklet
Identifying the Storers Auklet involves noting its compact body, short wings, and distinctive black plumage. Adults generally have a pronounced white facial plume that is more evident during the breeding season, contributing to their unique appearance. This plume, coupled with their bright orange beak, serves as a key field mark against their otherwise dark coloration. Juvenile Storers Auklets lack the developed facial plume of adults, often exhibiting a more muted coloration.
There is minimal sexual dimorphism in this species, with males and females appearing quite similar. However, during the breeding season, males may exhibit slightly more vibrant beak coloration, which plays a role in courtship displays. In flight, Storers Auklets appear stocky, with rapid wingbeats typical of alcids, and they exhibit a characteristic low, direct flight path over the sea.
Similar species include other auklets, such as the Crested Auklet, but the Storers Auklet can be differentiated by its smaller size and the absence of a crest. When perched, they often adopt an upright posture on rocky surfaces or among the grasses of their nesting sites, making them visible against the backdrop of their typical breeding environments.
Having trouble telling birds apart? Upload a photo to our bird identification tool for an instant species match.
Storers Auklet Habitat and Range
Preferred Habitat
Storers Auklets primarily inhabit remote, rocky islands in the North Pacific during the breeding season. They select sites with an abundance of crevices and rocky outcrops, which offer protection from predators and harsh weather. Examples include islands in the Aleutian chain and the Kuril Islands. Breeding habitats are often at low elevations, near the sea, to facilitate easy access to feeding areas.
Outside the breeding season, the Storers Auklet becomes more pelagic, inhabiting the open ocean. They exhibit a preference for waters rich in marine life, often associated with upwellings or nutrient-rich currents. Unlike some other seabird species, they are not commonly found in urban areas or inland regions. Seasonal shifts from nesting sites to open ocean habitats reflect their reliance on marine food sources and their adaptability to life at sea.
Geographic Range
The breeding range of the Storers Auklet encompasses the North Pacific, particularly along the Aleutian Islands of Alaska, the Kuril Islands of Russia, and extending to parts of the Commander Islands. During the non-breeding season, they disperse across the North Pacific Ocean, often moving southward as far as the coast of Japan and occasionally down the western coast of North America.
Migration corridors for this species are not well defined due to their extensive pelagic lifestyle, but they are generally understood to follow oceanic currents and areas of high marine productivity. While they are widespread across the North Pacific, population density hotspots include regions where food availability is high, such as the Bering Sea. Their presence in these areas is often linked to the abundance of small fish and zooplankton.
Want to know which birds visit your area? Browse our backyard birds by location guides for region-specific species lists.
What Does the Storers Auklet Eat?
The Storers Auklet primarily feeds on small marine zooplankton, with a strong preference for krill and copepods. These tiny crustaceans form the bulk of their diet and are crucial during the breeding season when nutritional demands are high. Auklets employ a surface diving technique to capture their prey, using their wings to 'fly' underwater and reach depths necessary to access dense swarms of zooplankton.
During different seasons, their diet may vary slightly to include small fish and other available marine invertebrates, but they show a marked preference for krill. Prey size is generally small, in line with the Auklet's own diminutive size. Foraging typically occurs during daylight hours, with birds often seen in flocks at sea, working cooperatively to locate and exploit feeding opportunities.
Storers Auklet Behavior and Social Structure
Storers Auklets exhibit intriguing social behaviors, particularly during the breeding season. They are highly colonial, forming large, dense nesting colonies on isolated islands. Within these colonies, they engage in complex courtship displays involving vocalizations and physical gestures such as head bobbing. These displays serve to strengthen pair bonds and facilitate mating.
Territorially, Auklets are not particularly aggressive, but they do defend their immediate nesting area against intruders. Their response to predators primarily involves evasive flight, as they have few means of defense on the ground. During the day, they are most active, with peak activity often occurring in the early morning and late afternoon when feeding conditions are optimal. Flocking behavior is common outside the breeding season, where they form loose, mobile groups on the open ocean.
Storers Auklet Nesting and Reproduction
Nesting for the Storers Auklet begins with the selection of rocky crevices and burrows on isolated islands, providing shelter from predators and the elements. Nests are minimalistic, often consisting of little more than a shallow depression lined with plant material and feathers when available.
A typical clutch consists of a single egg, which both parents incubate for approximately 30 to 35 days. After hatching, the chick remains in the nest for about 30 days before fledging. During this period, both parents are actively involved in feeding and caring for the young, ensuring a steady supply of food. The Storers Auklet typically raises one brood per year, with the breeding season tightly aligned with peak food availability to optimize chick survival rates.
Storers Auklet Sounds and Vocalizations
The primary vocalization of the Storers Auklet is a series of raspy, repetitive calls used during courtship and social interactions within colonies. These calls often possess a rhythmic quality, similar to a series of short, sharp notes. In addition to these calls, Auklets produce softer, murmuring sounds while in close proximity to mates or chicks.
Alarm calls are harsher and more abrupt, serving to alert others of potential threats. During the dawn chorus, the cacophony of calls from a colony can be quite striking, resembling a chorus of high-pitched whistles and squawks interspersed with softer, cooing notes.
Interesting Facts About the Storers Auklet
- 1Storers Auklet colonies can number in the tens of thousands, creating bustling communities reminiscent of seabird 'cities.'
- 2Unlike some seabirds, Storers Auklets have a single-egg clutch, placing high parental investment on each chick.
- 3These auklets 'fly' underwater using wing propulsion, a technique effective for capturing fast-moving zooplankton.
- 4Their dense colonies on remote islands contribute to nutrient cycling, enriching soils and supporting plant life.
- 5Storers Auklets are excellent swimmers, capable of reaching depths greater than 50 meters when foraging for food.
- 6They exhibit strong site fidelity, often returning to the same nesting sites year after year.
- 7Despite their small size, Storers Auklets undertake extensive seasonal movements across the North Pacific Ocean.
Storers Auklet Conservation Status
The International Union for Conservation of Nature (IUCN) currently classifies the Storers Auklet as a species of Least Concern, reflecting its stable population trend. However, threats such as oil spills, climate change, and introduced predators on breeding islands pose significant risks. Conservation efforts focus on protecting breeding habitats and monitoring population dynamics. Historically, the population of Storers Auklets has fluctuated in response to changes in oceanic conditions and human impacts. Maintaining healthy marine ecosystems and controlling invasive species are critical to ensuring the continued stability of this seabird's population.
