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Years without records are given for a species if it was present most
years and if inclusion of the year without records would make it clearer
that a species was not found some years.
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FIRST AND LAST DATES:
These are the first and last dates, respectively, that a species was
recorded. Note that a species may have been present before a First or
after a Last date (section 5-B). A First or Last date is only listed if
there appears to be enough observations to somewhat accurately determine
the date.
See Table 3.2 for dates when there few or no observations, which may
accordingly have affected observed First and Last dates.
-=not possible to assign a First or Last date because the bird species was
present continually or erratically throughout the year, because
observation effort may have been inadequate to determine the First or
Last date reasonably accurately, or because the date was not recorded.
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AVERAGE FIRST AND LAST DATES:
These were calculated for the entire 1973-1990 period.
AV First=average (earliest date-latest date)
AV Last=average (earliest date-latest date)
AV First, AV Last=Averages (AV) are only calculated for species with at
least three years of First or Last dates and in which an average (AV)
appears appropriate. For some species, the range in First or Last dates
is so great that an average doesn't appear meaningful and is not
calculated.
The pitfalls of AV First and AV Last dates are examined in
section 5-B-3.
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FREQUENCIES AFTER FIRST OR BEFORE LAST DATES:
First + 10 Days Last - 10 Days
Obs. Present Obs. Present
YR Days (%) Days (%)
For common summer and winter residents (see Table 5.1 for list), the
relative frequency with which a species was recorded 10 days or less
after its First Date or 10 days or less before its Last Date is
calculated for a sample of five years (e.g., usually 1976-1980). If
there were less than five days of observations in the 10 day period, a
different year was usually used.
Obs. Days=total number of observation days 10 days or less after the yearly
First Date or 10 days or less before the yearly Last Date. This includes
observation days in which a species may have been absent.
Present=number of days that a species was recorded divided by the total
Obs. Days.
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DAILY FREQUENCY (FREQ):
1-10=relative Daily Frequency (in number of tenths)(section 1-C) within a
month that had at least eight observation days (Table 3.1). The relative
Daily Frequency was calculated by dividing the number of observation days
that a species was recorded by the total number of observation days (see
Table 3.1), and then multiplying by 10. The result was then rounded-off
to the nearest whole number (section 1-E-1).
+=Daily Frequency of 0.1-0.4 tenths in a month that had at least eight
observation days (Table 3.1). If this relative Daily Frequency was
rounded-off to the nearest whole number, the result would be 0, so a
"+" was used to indicate that the species was present, albeit rarely.
.=species was not recorded in a month that had at least eight observation
days (Table 3.1). Thus, the species was either absent or overlooked.
A "." was used instead of a "0" (zero) to enhance readability of when a
species was absent (section 1-E-2).
P=species was present at least one day in a month with less than eight
observation days.
?=species was not recorded in a month with less than eight observation
days. Because of the low observation effort, it is not clear if the
species was absent or if it was present, but missed.
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AV DAILY FREQUENCY (FREQ):
These were calculated for the entire 1973-1990 period (section
1-C-4).
1-10=relative Average Daily Frequency (in number of tenths) for months with
at least eight observation days. The average was calculated by dividing
the sum of Daily Frequencies by the total number of months with at least
eight observation days (see Table 3.1), and then multiplying by 10. The
result was then rounded-off to the nearest whole number. If a
Daily Frequency was "+," the sum of Daily Frequencies was calculated as
if +=0.4.
+=Average Daily Frequency of 0.1-0.4 tenths for months with at least eight
observation days. If this frequency was rounded-off to the nearest whole
number, the result would be 0, so a "+" was used to indicate that the
species was present, albeit rarely.
If a species was Present (P) during 1973-1990 only in a month with
less than eight observation days, a "+" was used to indicate its
Average Daily Frequency.
.=average of 0.0 tenths. Thus, the species was either absent or overlooked
in all months with at least eight observation days. A "." was used
instead of a "0" (zero) to enhance readability of when a species was
absent (section 1-E-2).
++++ start of p. *35 in SOO 8 +++++++++++++++++++++++++++++++
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AVERAGE MONTHLY FREQUENCY:
Average Monthly Frequencies are also explained in section 1-D.
Because of the many years of observations, Average Monthly
Frequencies are calculated separately for three periods:
*1973 MONTHLY [before 1973]
73-81 MONTHLY
82-90 MONTHLY.
These divisions allow the reader to ascertain if relative Monthly
Frequencies may have changed during the course of Faxon's observations.
1-10=Average Monthly Frequency (in number of tenths) among Tolerable
Observation Effort (TOE) months (section 3-C). The Frequency was
calculated by dividing the number of TOE months in which a species was
recorded by the total number of TOE months (see Table 3.4), and then
multiplying by 10. The result was then rounded-off to the nearest whole
number.
Note that the Frequency in tenths (a number or ".", see
below)(section 1-E-1) is calculated only for months with TOE and is thus
unaffected by a species' presence or absence in non-TOE months.
.=0 tenths, and the species was also not recorded in any non-TOE month. A
"." is used instead of a "0" to enhance readability of when a species
appears to have been absent (section 1-E-2).
x=species present during a month in one year prior to 1973.
X=species present during a month in two or more years prior to 1973.
?=species not recorded in a month prior to 1973 but there were few or no
observations, so it may have been overlooked.
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SPECIES STATUS:
UNCONFIRMED=The species was noted by only one observer and was listed as a
vagrant (i.e., five or less total records) or not listed at all for the
Oregon Coast by Eltzroth (1987). Or this species is rare along
the Oregon Coast and can be difficult to distinguish from other much more
common species occurring along the Oregon Coast.
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