This report describes methods used to assess the status and trend of marbled murrelet popula tions under the plan.
Marbled murrelet population.
The primary cause of marbled murrelet population decline is the loss and modification of nesting habitat in old growth and mature forests through commercial timber harvests human induced fires and land conversions and to a lesser degree through natural causes such as wild fires and wind storms.
1 population falxa et al.
For the nest habitat monitoring component of the marbled murrelet effectiveness monitoring program there was no work in 2016.
Field and analytical methods pdf 1 6 mb 10 year report for the northwest forest plan.
It nests in old growth forests or on the ground at higher latitudes where trees cannot grow.
Subsequent intensive at sea population surveys have revealed that only 4 000 murrelets give or take a thousand exist off the coast of redwood national and state parks.
Marbled murrelets brachyramphus marmoratus are small seabirds that nest in old growth forests and feed in the pacific ocean murrelets need large areas of coastal and near coastal old growth forest for nesting.
Fws s threatened endangered species system track information about listed species in the united states.
Fish and wildlife service and other state federal and private researchers to participate in a program to estimate marbled murrelet population size.
A unique and threatened seabird.
At sea marbled murrelet population monitoring since 2000 wdfw has joined usda forest service pacific northwest research station u s.
Marbled murrelet movements are not well understood either but the birds carry out partial migrations outside the breeding season.
Marbled murrelets have a protracted breeding period with the individuals of a population not all breeding at the same time.
Publications that include recent population and habitat monitoring results in detail include the three chapters in the 20 year murrelet report.
A wdfw biologist examines a marbled murrelet for a diet research project teresa lorenz u s.
Under the plan monitoring is an essential component and is designed to help managers understand the degree to which the plan is meeting this objective.
2003 methods for surveying marbled murrelets pdf 3 mb.
They avoid fragmented and partially developed forest landscapes and are declining rapidly in washington and listed as a state endangered species.
Restore nesting habitat that will sustain a viable marbled murrelet population.
Its habit of nesting in trees was suspected but not documented until a tree climber found a chick in 1974 making it one of the last north american bird species to have its nest.
2016 2 nesting habitat raphael et al.
The age at which they begin breeding is unknown but it is assumed to be about two years.
