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Habitat Report
Carson • Habitat Report MSA | 1 Carson Habitat Report (to accompany map dated 6/30/2023) Introduction Robert Carson of Rock Island Shellfish requested a habitat survey to delineate all submerged aquatic vegetation (SAV) within the area of a proposed shellfish farm near the Hood Canal Bridge. The project site is on Jefferson County parcel numbers 965100009, 965100010, 965100011 (Figure 1). The purpose of this survey was to identify and document all flora, fauna, substrate types, depths, and other qualitative information. On June 6, 2023 from 10:00 am to 1:30 pm, Marine Surveys & Assessments (MSA) biologists surveyed the intertidal zone along three survey transects that spanned all three parcels. Weather was clear with a light wind. Figure 1. Vicinity Map Carson • Habitat Report MSA | 2 Survey Methods & Findings The survey transect baseline was established along the upper beach, parallel to the ordinary high water mark (OHWM); transects 1-3 ran perpendicular to this baseline. The transects were surveyed from east to west, or when looking at the water from shore, from left to right. Transects varied in length from 460 ft to 545 ft and spanned all three upland parcels. For each transect, MSA biologists navigated from the baseline using a 300-ft-long survey tape with attached compass. Data related to the substrate, elevation, and SAV coverage was recorded every 10 ft along each transect, using a slate and waterproof paper. The substrate recorded along the upper beach was mainly cobble and boulders, quickly transitioning to sand. Observed within the survey area were moon snails (Euspira lewisii), horse clams (Tresus sp.), geoduck (Panopea generosa), ochre sea stars (Pisaster ochraceus), sand dollars (Dendraster excentricus), unidentified small fish, and Pacific blood stars (Henricia leviuscula). Eelgrass: Areas of the invasive eelgrass (Zostera japonica) (Zj) were noted in the upper part of the survey area, transitioning to a mixed bed with the native eelgrass (Z. marina) (Zm) which ended approximately 350 ft from the baseline (Figures 3 and 5). In the waterward portion of the survey area was a bed of only Z. marina. Shoot counts ranged as follows: • Z. japonica bed: 0 to 613.3 shoots/m2 • Mixed bed: 0 to 1,333.3 shoots/m2 • Z. marina bed: 0 to 128 shoots/m2 On every transect where eelgrass was found, first and last occurrence was noted, and density counts were taken every 20 ft starting from a random distance along the transect within 10 ft of where eelgrass was first and last noted. The density counts were taken using a 0.25 m2 quadrat. Three separate counts were taken at each random distance and then averaged to represent the average density of each location. This data was used to delineate the boundaries of the eelgrass, determine if it is a bed or a patch, and provide random density counts throughout. Eelgrass can be delineated as either a bed, a patch, or individual shoots. The U.S. Army Corps of Engineers (USACE) defines an eelgrass bed as a minimum of 3 shoots per 0.25 m2 within 1 meter of any adjacent shoot. An eelgrass bed can be composed of many patches if the patches are within 5 m (16 ft) of each other. If the distance between patches is greater than 5 m, then it is not considered a continuous bed but instead individual patches. Any individual eelgrass shoots that are farther apart than 1 m of each other don’t constitute a patch or a bed. Macroalgae: On T-2, Saccharina coverage (5-100%) started at the end of the mixed eelgrass bed and continued beyond the survey area; on T-3 it started in the mixed eelgrass bed and on T-1 it started approximately 470 ft from the baseline in the Z. marina bed (Figure 4). Multiple species of other attached macroalgae at various densities were observed: • Ulva 5-50% • Mastocarpus 1-10% Carson • Habitat Report MSA | 3 • Porphyra 1-10% • Plocamium 5% • Sarcodiotheca 1-10% • Gracilaria 5% • Chondracanthus 5-10% • Desmarestia a. 5% Summary: The full survey results can be seen in Table 1. A map showing total macroalgae percent cover and eelgrass bed presence can be seen in Figure 5. Ulva is not included in the map because this area is not documented as herring spawning habitat by Washington Department of Fish and Wildlife (WDFW). Please note the depths in this report are for referencing habitat data only and can have an error of +/- 1 ft; these depths should not be used for engineering purposes. All protocols and methods used for this habitat survey are in compliance with guidance given by WDFW published in Eelgrass/Macroalgae Habitat Interim Survey Guidelines (rev. 06/16/2008) and with the procedures outlined in the USACE’s Components of a Complete Eelgrass Delineation Report (January 9, 2018). Figure 2. Looking waterward from the upper beach Carson • Habitat Report MSA | 4 Figure 3. Close up of the mixed eelgrass bed; both Z. japonica and Z. marina are visible Figure 4. Z. marina and kelp at the end of T-1 Carson • Habitat Report MSA | 5 Figure 5. Habitat survey results map Carson • Habitat Report MSA | 6 Table 1. Habitat survey results Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 1 0 Small Cobble/Large Cobble/Boulders. None. Barren. 1 10 Small Cobble/Large Cobble/Boulders. None. Mastocarpus 1%. 1 20 Small Cobble/Large Cobble/Boulders. None. Ulva 5%; Mastocarpus 5%. 1 30 Small Cobble/Large Cobble/Boulders. None. Ulva 10%; Mastocarpus 10%; Porphyra 5%. 1 40 Sand/Large Cobble. None. Ulva 20%; Porphyra 10%. 1 50 Sand/Large Cobble. None. Ulva 25%; Porphyra 10%. 1 60 Sand/Large Cobble. None. Ulva 40%; Porphyra 5%. 1 70 Sand/Large Cobble. None. Ulva 40%; Porphyra 5%. 1 80 Sand/Large Cobble. None. Ulva 40%. 1 90 Sand. None. Ulva 50%. 1 100 Sand. None. Ulva 30%. 1 109 Sand. Zj eelgrass bed starts. Ulva 30%. 1 110 Sand. Zj eelgrass bed. Ulva 30%. 1 112 Sand. Zj eelgrass bed (149.3). Ulva 30%. 1 120 Sand. Zj eelgrass bed. Ulva 25%. 1 130 Sand. Zm & Zj eelgrass bed. Ulva 25%. 1 132 Sand. Zm & Zj eelgrass bed (0). Ulva 25%. 1 140 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 150 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 152 Sand. Zm & Zj eelgrass bed (0). Ulva 20%. 1 160 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 170 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 172 Sand. Zm & Zj eelgrass bed (314.7). Ulva 20%. 1 180 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 190 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 192 Sand. Zm & Zj eelgrass bed (21.3). Ulva 20%. 1 200 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 210 Sand. Zm & Zj eelgrass bed. Ulva 20%. 1 212 Sand. Zm & Zj eelgrass bed (80). Ulva 20%. 1 220 Sand. Zm & Zj eelgrass bed. Ulva 25%. Carson • Habitat Report MSA | 7 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 1 230 Sand. Zm & Zj eelgrass bed; Zm density increases. Ulva 25%. 1 232 Sand. Zm & Zj eelgrass bed (106.7). Ulva 25%. 1 240 Sand. Zm & Zj eelgrass bed. Ulva 10%. 1 250 Sand. Zm & Zj eelgrass bed. Ulva 10%. 1 252 Sand. Zm & Zj eelgrass bed (1333.3). Ulva 10%. 1 260 Sand. Zm & Zj eelgrass bed. Ulva 5%. 1 270 Sand. Zm & Zj eelgrass bed. Ulva 5%. 1 272 Sand. Zm & Zj eelgrass bed (506.7). Ulva 5%. 1 280 Sand. Zm & Zj eelgrass bed. Ulva 5%. 1 290 Sand. Zm & Zj eelgrass bed. Ulva 5%. 1 292 Sand. Zm & Zj eelgrass bed (453.3). Ulva 5%. 1 300 Sand. Zm & Zj eelgrass bed. Ulva 10%. 1 310 Sand. Zm & Zj eelgrass bed. Ulva 10%. 1 312 Sand. Zm & Zj eelgrass bed (480). Ulva 10%. 1 320 Sand. Zm & Zj eelgrass bed. Ulva 10%; Plocamium 5%. 1 330 Sand. Zm & Zj eelgrass bed. Ulva 10%. 1 332 Sand. Zm & Zj eelgrass bed (480). Ulva 10%. 1 340 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%. 1 350 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%. 1 352 Sand. Zm & Zj eelgrass bed (373.3). Ulva 20%; Sarcodiotheca 5%. 1 360 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%. 1 367 Sand. Zm & Zj eelgrass bed ends. Ulva 20%; Sarcodiotheca 5%. 1 370 Sand. None. Ulva 20%; Sarcodiotheca 5%. 1 380 Sand. None. Ulva 20%. 1 390 Sand. None. Ulva 20%. 1 400 Sand. None. Ulva 25%; Sarcodiotheca 1%. 1 410 Sand. None. Ulva 25%; Sarcodiotheca 1%. Carson • Habitat Report MSA | 8 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 1 420 Sand. None. Ulva 40%; Sarcodiotheca 5%. 1 430 Sand. None. Ulva 40%; Sarcodiotheca 5%. 1 440 Sand. None. Ulva 40%; Sarcodiotheca 5%. 1 450 Sand. Zm eelgrass bed starts. Ulva 30%; Sarcodiotheca 10%. 1 453 Sand. Zm eelgrass bed (5.3). Ulva 30%; Sarcodiotheca 10%. 1 460 Sand. Zm eelgrass bed. Ulva 30%; Sarcodiotheca 10%. 1 470 Sand. Zm eelgrass bed. Ulva 20%; Sarcodiotheca 10%; Gracilaria 5%; Saccharina 10%. 1 473 Sand. Zm eelgrass bed (0). Ulva 20%; Sarcodiotheca 10%; Gracilaria 5%; Saccharina 10%. 1 480 Sand. Zm eelgrass bed. Ulva 20%; Sarcodiotheca 10%; Gracilaria 5%; Saccharina 10%. 1 490 Sand. Zm eelgrass bed. Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 493 Sand. Zm eelgrass bed (21.3). Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 500 Sand. Zm eelgrass bed. Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 510 Sand. Zm eelgrass bed. Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 513 Sand. Zm eelgrass bed (0). Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. Carson • Habitat Report MSA | 9 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 1 520 Sand. Zm eelgrass bed. Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 523 Sand. Zm eelgrass bed (0). Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 525 Sand. Zm eelgrass bed ends. Ulva 10%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 1 530 Sand. None. Ulva 10%; Sarcodiotheca 5%; Saccharina 50%. 1 540 Sand. None. Ulva 10%; Sarcodiotheca 5%; Saccharina 100% (continues). 1 545 Sand. None. Barren. 2 0 Small Cobble/Large Cobble/Boulders. None. Barren. 2 10 Small Cobble/Large Cobble/Boulders. None. Ulva 5%; Mastocarpus 5%. 2 20 Small Cobble/Large Cobble/Boulders. None. Ulva 5%; Mastocarpus 5%. 2 30 Sand/Large Cobble. None. Ulva 10%; Porphyra 1%. 2 40 Sand. None. Ulva 20%; Porphyra 5%. 2 50 Sand. None. Ulva 20%; Porphyra 5%. 2 60 Sand. None. Ulva 40%; Porphyra 5%. 2 70 Sand. None. Ulva 40%; Porphyra 5%. 2 80 Sand. None. Ulva 10%. 2 90 Sand. None. Ulva 10%. 2 100 Sand. None. Ulva 10%. 2 110 Sand. None. Ulva 10%. 2 120 Sand. None. Ulva 30%. 2 130 Sand. None. Ulva 30%. 2 140 Sand. None. Ulva 30%. 2 146 Sand. Zj eelgrass bed starts. Ulva 30%. 2 149 Sand. Zj eelgrass bed (96). Ulva 30%. 2 150 Sand. Zj eelgrass bed. Ulva 25%. 2 160 Sand. Zj eelgrass bed. Ulva 25%. 2 169 Sand. Zj eelgrass bed (112). Ulva 25%. 2 170 Sand. Zj eelgrass bed. Ulva 25%. Carson • Habitat Report MSA | 10 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 2 180 Sand. Zm & Zj eelgrass bed. Ulva 25%. 2 189 Sand. Zm & Zj eelgrass bed (1066.7). Ulva 5%. 2 190 Sand. Zm & Zj eelgrass bed. Ulva 5%. 2 200 Sand. Zm & Zj eelgrass bed. Ulva 5%. 2 209 Sand. Zm & Zj eelgrass bed (0). Ulva 5%. 2 210 Sand. Zm & Zj eelgrass bed. Ulva 5%. 2 220 Sand. Zm & Zj eelgrass bed. Ulva 5%. 2 229 Sand. Zm & Zj eelgrass bed (154.7). Ulva 5%. 2 230 Sand. Zm & Zj eelgrass bed. Ulva 15%. 2 240 Sand. Zm & Zj eelgrass bed. Ulva 15%. 2 249 Sand. Zm & Zj eelgrass bed (0). Ulva 15%. 2 250 Sand. Zm & Zj eelgrass bed. Ulva 15%. 2 260 Sand. Zm & Zj eelgrass bed. Ulva 15%. 2 269 Sand. Zm & Zj eelgrass bed (0). Ulva 15%. 2 270 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%; Gracilaria 5%. 2 280 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%; Gracilaria 5%. 2 289 Sand. Zm & Zj eelgrass bed (0). Ulva 20%; Sarcodiotheca 5%; Gracilaria 5%. 2 290 Sand. Zm & Zj eelgrass bed. Ulva 20%; Sarcodiotheca 5%; Gracilaria 5%. 2 300 Sand. Zm & Zj eelgrass bed. Ulva 20%. 2 309 Sand. Zm & Zj eelgrass bed (138.7). Ulva 20%. 2 310 Sand. Zm & Zj eelgrass bed. Ulva 30%. 2 320 Sand. Zm & Zj eelgrass bed. Ulva 30%. 2 325 Sand; Old aquaculture structure starts. Zm & Zj eelgrass bed. Ulva 30%. 2 329 Sand. Zm & Zj eelgrass bed (0). Ulva 30%. 2 330 Sand. Zm & Zj eelgrass bed. Ulva 40%. 2 335 Sand. Zm & Zj eelgrass bed ends. Ulva 40%. 2 340 Sand. None. Ulva 40%. 2 350 Sand. None. Ulva 20%; Porphyra 10%; Saccharina 10%. Carson • Habitat Report MSA | 11 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 2 360 Sand. None. Ulva 20%; Porphyra 10%; Plocamium 5%; Sarcodiotheca 5%; Saccharina 10%. 2 370 Sand. None. Ulva 20%; Porphyra 10%; Plocamium 5%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 10%. 2 380 Sand. None. Ulva 20%; Porphyra 10%; Plocamium 5%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 10%. 2 390 Sand. None. Ulva 20%; Porphyra 10%; Plocamium 5%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 10%. 2 400 Sand. None. Ulva 50%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 2 410 Sand. None. Ulva 50%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 2 420 Sand. None. Ulva 50%; Sarcodiotheca 5%; Chondracanthus 10%; Saccharina 20%. 2 430 Sand. None. Ulva 50%; Sarcodiotheca 5%; Chondracanthus 10%; Saccharina 20%. 2 433 Sand; Old Aquaculture structure ends. None. Ulva 50%; Sarcodiotheca 5%; Chondracanthus 10%; Saccharina 20%. 2 440 Sand. None. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 10%; Saccharina 30%. 2 447 Sand. Zm eelgrass bed starts. Ulva 30%; Sarcodiotheca 5%; Saccharina 30%. 2 450 Sand. Zm eelgrass bed (0). Ulva 20%; Sarcodiotheca 5%; Saccharina 25%. Carson • Habitat Report MSA | 12 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 2 460 Sand. Zm eelgrass bed. Ulva 20%; Sarcodiotheca 5%; Saccharina 25%. 2 470 Sand. Zm eelgrass bed (0). Ulva 20%; Sarcodiotheca 10%; Saccharina 40%. 2 480 Sand. Zm eelgrass bed. Ulva 20%; Sarcodiotheca 10%; Saccharina 40%. 2 490 Sand. Zm eelgrass bed (0). Ulva 20%; Sarcodiotheca 10%; Saccharina 40%. 2 500 Sand. Zm eelgrass bed continues. Ulva 20%; Sarcodiotheca 10%; Saccharina 40% (continues). 3 0 Sand/Large Cobble/Boulder. None. Mastocarpus 5%. 3 10 Sand/Large Cobble/Boulder. None. Ulva 5%; Mastocarpus 10%. 3 20 Sand/Large Cobble. None. Ulva 10%. 3 30 Sand/Large Cobble. None. Ulva 20%. 3 40 Sand. None. Ulva 20%. 3 50 Sand. None. Ulva 10%. 3 60 Sand. None. Ulva 10%. 3 70 Sand. None. Ulva 10%. 3 80 Sand. None. Ulva 10%. 3 90 Sand. None. Ulva 5%. 3 100 Sand. None. Ulva 5%. 3 110 Sand. None. Ulva 5%. 3 120 Sand. None. Ulva 5%. 3 130 Sand. None. Ulva 5%. 3 140 Sand. None. Ulva 10%. 3 150 Sand. None. Ulva 10%. 3 160 Sand. None. Ulva 10%. 3 162 Sand. Zj eelgrass bed starts. Ulva 10%. 3 165 Sand. Zj eelgrass bed (0). Ulva 10%. 3 170 Sand. Zj eelgrass bed. Ulva 5%. 3 180 Sand. Zj eelgrass bed. Ulva 5%. 3 185 Sand. Zj eelgrass bed (0). Ulva 5%. 3 190 Sand. Zj eelgrass bed. Ulva 20%. 3 200 Sand. Zj eelgrass bed. Ulva 20%. 3 205 Sand. Zj eelgrass bed (613.3). Ulva 20%. 3 210 Sand. Zj eelgrass bed. Ulva 30%. 3 220 Sand. Zm & Zj eelgrass bed. Ulva 30%. Carson • Habitat Report MSA | 13 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 3 225 Sand. Zm & Zj eelgrass bed (442.7). Ulva 30%. 3 230 Sand. Zm & Zj eelgrass bed. Ulva 30%. 3 240 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 245 Sand. Zm & Zj eelgrass bed (144). Ulva 20%. 3 250 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 260 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 265 Sand. Zm & Zj eelgrass bed (304). Ulva 20%. 3 270 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 280 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 285 Sand. Zm & Zj eelgrass bed (213.3). Ulva 20%. 3 290 Sand. Zm & Zj eelgrass bed. Ulva 20%. 3 300 Sand. Zm & Zj eelgrass bed. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 305 Sand. Zm & Zj eelgrass bed (106.7). Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 310 Sand. Zm & Zj eelgrass bed. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 320 Sand. Zm & Zj eelgrass bed. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 325 Sand. Zm & Zj eelgrass bed (69.3). Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 330 Sand. Zm & Zj eelgrass bed. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 340 Sand. Zm & Zj eelgrass bed. Ulva 30%; Sarcodiotheca 5%; Chondracanthus 5%; Saccharina 5%. 3 345 Sand. Zm & Zj eelgrass bed (170.7). Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 5%. 3 350 Sand. Zm & Zj eelgrass bed. Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 5%. Carson • Habitat Report MSA | 14 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 3 353 Sand. Zm eelgrass bed. Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 5%. 3 360 Sand. Zm eelgrass bed. Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 5%. 3 365 Sand. Zm eelgrass bed (0). Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 5%. 3 370 Sand. Zm eelgrass bed. Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 20%. 3 380 Sand. Zm eelgrass bed. Ulva 40%; Porphyra 5%; Sarcodiotheca 5%; Saccharina 20%. 3 385 Sand. Zm eelgrass bed (128). Ulva 50%; Sarcodiotheca 10%; Chondracanthus 5%; Saccharina 20%. 3 390 Sand. Zm eelgrass bed. Ulva 50%; Sarcodiotheca 10%; Chondracanthus 5%; Saccharina 20%. 3 400 Sand. Zm eelgrass bed. Ulva 50%; Sarcodiotheca 10%; Chondracanthus 5%; Saccharina 20%. 3 405 Sand. Zm eelgrass bed (58.7). Ulva 50%; Sarcodiotheca 10%; Chondracanthus 5%; Saccharina 20%. 3 410 Sand. Zm eelgrass bed. Ulva 40%; Sarcodiotheca 10%; Chondracanthus 5%; Saccharina 20%. 3 420 Sand. Zm eelgrass bed. Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 3 425 Sand. Zm eelgrass bed (10.7). Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 3 430 Sand. Zm eelgrass bed. Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. Carson • Habitat Report MSA | 15 Transect Distance (ft) Substrate and Other Features Noted Eelgrass presence (shoots per square meter) Macroalgae cover 3 440 Sand. Zm eelgrass bed. Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 20%. 3 445 Sand. Zm eelgrass bed (5.3). Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 40%. 3 450 Sand. Zm eelgrass bed. Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 40%. 3 460 Sand. Zm eelgrass bed continues. Ulva 40%; Sarcodiotheca 10%; Gracilaria 5%; Desmarestia a. 5%; Saccharina 40% (continues).