Pacific sardine (Sardinops sagax) COSEWIC assessment and status report: chapter 11

extent of occurrence (EO) (km²) :

1.250 million km² extending from Alaska to Mexico

specify trend (decline, stable, increasing, unknown):

Increasing

are there extreme fluctuations in EO (> 1 order of magnitude)?

Yes, but on a scale of decades

area of occupancy (AO) (km²) :

Perhaps 36,000 km² within Canadian waters

specify trend (decline, stable, increasing, unknown) : Increasing

are there extreme fluctuations in AO (> 1 order magnitude)?

Yes, but on a scale of decades

number of extant locations :

Gulf of California and seasonally from Baja to Alaska

specify trend in # locations (decline, stable, increasing, unknown) :

Increasing

are there extreme fluctuations in # locations (>1 order of magnitude)?

Yes, but on a scale of decades

habitat trend:  specify declining, stable, increasing or unknown trend in area, extent or quality of habitat:

Increasing

generation time (average age of parents in the population) (indicate years, months, days, etc.):

2-3 years

number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values) :

Billions of individuals in total population, on average about 10% migrate into Canadian waters but only occasionally reproduce here.

total population trend:  specify declining, stable, increasing or unknown trend in number of mature individuals :

Increasing

if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)

are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?

Yes, on a scale of decades

is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., < 1 successful migrant / year)?

No

list each population and the number of mature individuals in each:

Only one panmictic population

specify trend in number of populations (decline, stable, increasing, unknown) :

N/A

are there extreme fluctuations in number of populations (>1 order of magnitude)?

N/A

does species exist elsewhere (in Canada or outside)?

Yes

status of the outside population(s)?

Increasing

is immigration known or possible?

Yes

would immigrants be adapted to survive here?

N/A

is there sufficient habitat for immigrants here?

N/A