Dataset Identification:
Resource Abstract:
- description: In 1994, a minimum of approximately 2,792 pairs of the endangered California least tern (Sterna antillarum browni)
nested at 36 sites along the coast of California. This 20% increase over1993 breeding population size continues the trend
since 1987 of continued growth of the populating and is directly attributable to the efforts of people working on behalf of
recovery of the species. The statewide total of 2,792 pairs is the highest number recorded since systematic monitoring began
in 1973, and represents a four-and-a-half-fold increase over the estimated 600 pairs of that year. Unfortunately, in 1994,
heavy predation pressure at many sites and an apparent food shortage at two large sites, combined with a variety of human-related
constraints on tern reproductive success, resulted in poor fledgling production statewide. A minimum of approximately 1755-1871
fledglings were produced, 11% fewer than in 1993, resulting in a statewide fledgling per pair ratio of 0.62-0.67. Documented
and suspected predator species across the State ran the usual gamut; however, kestrels, crows, ravens, rats, and a peregrine
falcon were responsible for the loss of the majority of terns and tern eggs lost to predation in 1994. As usual, successful
and unsuccessful sites were distributed throughout the state. Terns themselves were more unevenly distributed: 48% of the
statewide population bred at only four sites (Venice Beach, Huntington Beach, Santa Margarita River/North Beach, Mission Bay/FAA
Island); inclusion of an additional five sites (NAS Alameda, Seal Beach, Bolsa Chica, Delta Beach/North, Tijuana River/South)
accounted for 76% of all breeding pairs. And, again as usual, the bulk of fledglings produced statewide came from only a few
sites; those produced at NAS Alameda, Venice Beach, Seal Beach, Santa Margarita River/North Beach, Mission Bay/FAA Island,
and Delta Beach North comprised approximately 70% of the State total.; abstract: In 1994, a minimum of approximately 2,792
pairs of the endangered California least tern (Sterna antillarum browni) nested at 36 sites along the coast of California.
This 20% increase over1993 breeding population size continues the trend since 1987 of continued growth of the populating and
is directly attributable to the efforts of people working on behalf of recovery of the species. The statewide total of 2,792
pairs is the highest number recorded since systematic monitoring began in 1973, and represents a four-and-a-half-fold increase
over the estimated 600 pairs of that year. Unfortunately, in 1994, heavy predation pressure at many sites and an apparent
food shortage at two large sites, combined with a variety of human-related constraints on tern reproductive success, resulted
in poor fledgling production statewide. A minimum of approximately 1755-1871 fledglings were produced, 11% fewer than in 1993,
resulting in a statewide fledgling per pair ratio of 0.62-0.67. Documented and suspected predator species across the State
ran the usual gamut; however, kestrels, crows, ravens, rats, and a peregrine falcon were responsible for the loss of the majority
of terns and tern eggs lost to predation in 1994. As usual, successful and unsuccessful sites were distributed throughout
the state. Terns themselves were more unevenly distributed: 48% of the statewide population bred at only four sites (Venice
Beach, Huntington Beach, Santa Margarita River/North Beach, Mission Bay/FAA Island); inclusion of an additional five sites
(NAS Alameda, Seal Beach, Bolsa Chica, Delta Beach/North, Tijuana River/South) accounted for 76% of all breeding pairs. And,
again as usual, the bulk of fledglings produced statewide came from only a few sites; those produced at NAS Alameda, Venice
Beach, Seal Beach, Santa Margarita River/North Beach, Mission Bay/FAA Island, and Delta Beach North comprised approximately
70% of the State total.
Citation
- Title California Least Tern Breeding Survey 1994 Season.
-
- creation Date
2018-05-19T22:10:46.978181
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Metadata data stamp:
2018-08-07T00:18:37Z
Resource Maintenance Information
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- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-07T00:18:37Z
Metadata contact
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pointOfContact
- organisation Name
CINERGI Metadata catalog
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- Contact information
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- Address
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- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:94579542-3506-41fa-a9d4-26798c50ea9e
Metadata record format is ISO19139 XML (MD_Metadata)