Population Density Marbled Murrelet

It nests in old growth forests or on the ground at higher latitudes where trees cannot grow.

Population density marbled murrelet.

Abstract the marbled murrelet brachyramphus marmoratus is federally threatened in part of its range in western north america information on density and productivity is important for managing populations. Our monitoring plan is specifically designed to estimate marbled murrelet density population size and population trend in each of five geographic areas con servation zones between the northern tip of washington state and san. Over an 18 yr. Average estimated population density of marbled murrelet by primary sampling unit psu for oregon pacific region es gis september 15 2008 fy08 es mamu 0004 0 20 40 60 80 100 km 0 20 40 60 mi based upon at sea.

The density values range from 0 01 birds per square kilometre to 3 300 birds per square kilometre with the vast majority of the. 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. The marbled murrelet brachyramphus marmoratus is a small seabird from the north pacific. Fish and wildlife service and other state federal and private researchers to participate in a program to estimate marbled murrelet population size and trends during the breeding season between san francisco bay and washington state.

2012 gillnet fishery catch effort has increased. It is a member of the auk family. Population trends of the marbled murrelet 773 on patterns of murrelet density miller et al. The distance from shore of the offshore boundary for the target population varied by zone and.

2006 raphael et al. Within a single planning unit were averaged adjusting for survey effort to calculate the illustrated metric average density of marbled murrelet by planning unit. Washington marbled murrelet population density trend for 2001 2015 for zones 1 and 2 combined all marine waters of washington state 15 2015 marbled murrelet monitoring 1 in 1992 the marbled murrelet was listed as u s. At sea marbled murrelet population monitoring since 2000 wdfw has joined usda forest service pacific northwest research station u s.