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Экология ВИЭ / СЭС / Final Programmatic Environmental Impact Statement for Solar Energy Development.pdf
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1 4.10.3 Aquatic Biota

2

3Section 4.10.3 of the Draft Solar PEIS provided a general description of freshwater

4aquatic organisms and habitats grouped according to the major USGS water resource regions that

5coincide with the six-state study area. The information provided in the Draft Solar PEIS is still

6 correct, but the following updates are provided based on comments received. Within the six-state 7 study area, the BLM administers lands containing a variety of freshwater aquatic habitats; these,

8in turn, support a wide diversity of aquatic biota. The area considered contains a variety of

9freshwater aquatic habitats that in turn support a wide diversity of aquatic biota. Aquatic habitats

10on these lands range from isolated desert springs in the southwestern portion, which support

11unique and endemic fish species such as pupfish (family Cyprinodontidae); coldand coolwater

12portions of the Colorado, Green, and Snake Rivers that support trout fisheries; and coastal rivers

13of northern California that support anadromous salmon. In addition to fish, aquatic habitats also

14support a large variety of aquatic invertebrates, including mollusks, crustaceans, and insects. The

15information provided in the Draft Solar PEIS is still correct, but the following updates are

16provided based on comments received.

17

18

19 4.10.3.1 Pacific Northwest Hydrologic Region

20

21The description of aquatic communities provided in the Draft Solar PEIS remains valid,

22and no updates were needed. Fish and invertebrates of the Pacific Northwest hydrologic region

23were described in the Draft Solar PEIS. Only a small portion (in northern Nevada and northern

24Utah) of the Pacific Northwest hydrologic region falls within the six-state study area.

25

26

27 4.10.3.2 Lower Colorado, Rio Grande, and Great Basin Hydrologic Regions

28

29Fish and invertebrates of the Lower Colorado, Rio Grande, and Great Basin Hydrologic

30Regions were described in the Draft Solar PEIS. The description of aquatic communities

31provided in the Draft Solar PEIS remains valid, but an expanded description of invertebrate

32communities in desert surface waters is provided below based on comments received on the

33Draft Solar PEIS.

34

35Surface water features in arid ecosystems can contain a seasonally variable community of

36aquatic invertebrates (Levick et al. 2008). In intermittent streams, invertebrate communities are

37profoundly structured by habitat variables, such as short and long-term trends in seasonal

38flooding, drought duration, proximity to perennial water, and instream drought refugia

39(Stanley et al. 1994; Sponseller et al. 2010; Lake 2003). Invertebrates have several adaptations to

40dry conditions. Some invertebrates employ physiological mechanisms such as desiccation

41tolerance (e.g., Chironomidae and Oligochaetes) and aestivation during dry periods. Other

42invertebrates survive seasonal drying by using a variety of behavioral mechanisms. For example,

43invertebrates in intermittent streams can burrow into the hyporheic zone or drift to perennial

44reaches as the stream dries (Levick et al. 2008; Lytle et al. 2008). Invertebrate communities in

45ephemeral surface waters are studied far less, and there is little information on these

46communities available for the six-state area. Invertebrates that live in fishless ephemeral streams

Final Solar PEIS

4-16

July 2012