This dataset maps Late-Successional Reserves (LSR) associated with
occupied marbled murrelet sites. The criteria for mapping these areas
are identified on pages C-10 of the Northwest Forest Plan Standards and
Guidelines( See Supplemental Info). Supplemental direction to the
administrative units in BLM IM OR-2003-001 stated that protection will
be afforded to all contiguous existing habitat and recruitment habitat
(stands that are capable of becoming murrelet habitats within 25 years)
for marbled murrelets within a 1/2 mile radius of any site where
occupation behavior (e.g., active nest, fecal ring, eggshell fragments,
or birds flying low, through, into or out of the forest canopy within or
adjacent to a stand) has been verified. Contiguous was defined as all
stands of existing habitat and recruitment habitat that are not
separated by more than 100 meters at their closest point. Existing and
recruitment habitat was defined by the biologists in the respective
districts/resource areas. Discernible landscape features such as roads,
ridge-tops, streams and, if necessary, contrasting edges created by
several stages were used to define the boundaries of the areas. The 1/2
mile radius circle was centered on either the location of the observed
occupied behavior or within 1/2 mile of the behavior location, whichever
maximized interior old-growth habitat. This version of the theme
includes all locations with occupied murrelet behavior as of September
30, 2002. Occupied Marbled Murrelet Sites that included any General
Forest Management Areas, Connectivity/Diversity Blocks, and/or Adaptive
Management Areas were mapped completely, even if they partially included
an area in an LSR, Congressionally Reserved, and/or AMR. Sites which
were totally encompassed within Land Unit Allocation (LUA) theme
categories Congressional Reserved, LSRs, and/or AMR were not delineated
for this theme.