
Duck Creek mouth, then and now
Mapping and observations in 1995 In June, 1995, I mapped lower ‘Duck Creek triangle,’ a sliver of fenced-off remnant tidelands…
1995, updated 2024 | Richard Carstensen | 16 pagesDiscoverySoutheast.org
‘Halophytes’ are salt tolerant plants (Not salt-loving plants, halophiles, as the ecologist John Thilenius memorably insisted!) The community of vascular halophytes (as opposed to algae) in the upper intertidal is known as the salt marsh. It’s helpful to further subdivide the salt marsh into the high marsh, populated mostly by slightly tolerant grasses, and low marsh, dominated by more tolerant Lyngbye sedge.
Black bear trails in low-marsh sedges, Kòonax, (Traitor’s Cove, Revillagigedo Island).
The low marsh community of tidal sedges, goosetongue, and arrowgrass is the salad bowl of Southeast. In contrast, the high marsh is dominated by grasses like beach rye—more fibrous and less palatable than sedges—and this belt has generally lower wildlife value.
NWI (National Wetlands Inventory) maps do not delineate high and low marsh. This key ecological break needs more cartographic attention throughout Southeast Alaska. Only for the Mendenhall Wetlands near Juneau have the marsh differences been well-mapped (Carstensen et al 2004). Studies there show that the high marsh-low marsh break has changed dramatically during the past century. Human construction and river sedimentation are partially responsible, but the primary driver of salt-marsh community changes is glacial rebound. As glaciers and icefields melt, northern Southeast is responding by rising from the sea. The phenomenon, known as glacial or isostatic rebound, is more pronounced here than anywhere else in the world. Rebound rates in Glacier Bay and surroundings are as high as 1.23 inches per year (Larsen et al. 2005).
In spite of its confinement to a narrow intertidal belt, Lyngbye sedge may be the most important Southeast plant for many wide-ranging grazing birds and mammals. Its importance is especially significant in spring, before plants of the forest become available to herbivores. Sedges feed grazing black and brown bears, deer, moose, and several goose species.
For a salt-marsh food web and thoughts on trophic relations of this most generous of all ‘exporting communities,’ see Nature>Ecology>Trophics.
Mud Bay (no Tlingit name?). In June, 2013, Discovery Southeast & Bosworth Botanical Consulting surveyed this estuary for the Southeast Alaska Land Trust. Our report is here. View is south down spine of Ayik, you gotta get ready (Chilkat Peninsula). Jilkáat Wát, cache-river mouth (Chilkat estuary) in right distance.
Mapping and observations in 1995 In June, 1995, I mapped lower ‘Duck Creek triangle,’ a sliver of fenced-off remnant tidelands…
1995, updated 2024 | Richard Carstensen | 16 pagesFocus group tour On Thursday, August 26th, about 30 masked aficionados of dynamic Fish Creek delta assembled on invitation from…
2021 | Richard Carstensen, Bob Armstrong | RC-59 pages: BA vid-linksDiscovery-SAWC collaboration Beginning in early 2020, Discovery Southeast is assisting the Southeast Alaska Watershed Coalition with investigations at Fish Creek…
2020 | Richard Carstensen |Fresh and saltwater wetlands serving birds Wet, open places shut down pretty firmly to feathered things in the Alaskan winter,…
Spring 1999 | Richard Carstensen | 6 pagesIn summer 2014, Koren Bosworth, Cathy Pohl, Andrew Allison and I surveyed wetlands throughout the CBJ. Although we were not…
2016 | Richard Carstensen | 31 page excerpt (of 512p)In late October, the meandery delta channels at Asx‘ée, twisted tree (Eagle River) are pretty ‘used-up.’ Salmon season is mostly…
2015 | Richard Carstensen | 1 minuteIn June, 2013, Diane Mayer of Southeast Alaska Land Trust asked Koren Bosworth and me to survey and describe wetlands…
2013 | Richard Carstensen & Koren Bosworth | 64 pages, 12MBOut to the scout campside of Eagle River today, Sept 10, 2017. This is where I became a naturalist in…
2017 | Richard Carstensen | 2 minutesIn 2009, with support from the Southeast Alaska Land Trust, Bob, Mary, Marge and I distilled much of the information…
2009 | Armstrong, Carstensen, Willson and Osborn | 82 pagesDiscovery naturalists Steve Merli, John Hudson and Richard Carstensen walked from end Mendenhall Peninsula Road to Industrial Boulevard with staff…
2018 | Richard Carstensen | 4:21 minutesTrophics and geography Nexus explains how estuaries develop, their food webs, and their importance to the greater archipelago. Includes field…
2004 | Richard Carstensen, Kathy Hocker | 12 pagesSummary of a 14 month bird survey on Mendenhall Wetlands State Game Refuge, undertaken on request from US Fish &…
2004 | Robert Armstrong, Richard Carstensen, Mary Willson | 77 pages