2025 ANNUAL REPORT
Monitoring Avian Survivorship and Productivity (MAPS) Program
Powell II Banding Station - Los Osos, California
Prepared by Jocelynn Marriott
Project in collaboration with:
Institute for Bird Populations (IBP)
California Central Coast Joint Venture (C3JV)
Facilitated by California State Parks - San Luis Obispo Coast District
Capture rate as the number of birds per 100 net-hours for all operating years at the Powell II MAPS station. Total net-hours at the end of the season is a measure of study effort, calculated by the sum of the number of hours each net was open on each session day (10 nets, 10 session days, 6 hour days). Net-hours vary from season to season, but the MAPS protocol aims to achieve 600 net-hours per season. There were 556 net-hours in 2025. Capture rate per 100 net-hours is measured by dividing the total number of birds caught in a season, including unbanded birds, by the number of net-hours in a season, multiplied by 100. Note that the station did not operate in 2022.
Powell II MAPS Station 2025 Schedule (above), and Net Locations (below)
Percent of total captures (n=399) by bird species for the 2025 season at Powell II MAPS Station. Other includes: Lesser Goldfinch (4), Northern House Wren (4), Western Flycatcher (4), Downy Woodpecker (3), Mourning Dove (2), Ash-throated Flycatcher (1), Lazuli Bunting (1)
Birds captured in 2025 by species and banding status (that is their "Code"), which is either a newly banded bird, a bird recaptured with a band, or an unbanded bird.
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* This table also displays the number of known unique individuals captured in 2025; some individuals are captured more than once in the season, and those capture events are reflected in the Total Capture Events. ‘U’ represents an unknown number of individuals, as the birds were unbanded.
Birds captured in 2025 that were banded and recaptured in previous years. Band numbers are listed under the species, and the cells contain the number of times the bird was caught in that year.
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Song Sparrows 225162504 (male) and 225162529 (male) were banded in 2020, as adult and hatching year birds respectively. That means 225162504 is at minimum 6 years old, and we know 225162529 is 5 years old.
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Number of Song Sparrow capture events and number of individual Song Sparrows captured over time. This chart is only for anecdotal interest; the sample sizes we have at our station alone (i.e. in isolation from other MAPS datasets) are not sufficient to draw conclusions about the capture frequency trends of any given species. Note the station did not operate in 2022.
The relative percentages of frequently-captured species captured in each operating year. The 10 most frequently captured species are shown, while the remaining species capture events have been added together and are represented by the ‘other’ category. This chart is only for anecdotal interest; the sample sizes we have at our station alone (i.e. in isolation from other MAPS datasets) are not sufficient to draw conclusions about species composition changes at the Powell II station. Note that the station did not operate in 2022.
In 2025, the Powell II Station Banding Team collected 54 feather samples for the Bird Genoscape Project. The list of species sampled is shown inthe table to the right:​
There are several fascinating short videos about the Bird Genoscape Project available on their website. Have a look!:
https://www.birdgenoscape.org/videolibrary/
The photo below shows the Powell II banding station's feather contribution's arriving safely to the Bird Genoscape Project's lab.
