The Ecology of Tijuana Estuary, California: An Estuarine Profile

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Figure 47. The native dune vegetation includes salt grass on the back dune (left), dune ragweed (left foreground). rand verbena (right foreground). and dune primrose. Insects that burrow beneath the plants include the globose dune beetle, the sand dune tiger beetle, and flower beetles (Notoxus). Mclntire collection, copyright 1486 by Zedler.
Figure 48. Birds that nest on the sand dunes are the California least tern and the snowy plover. Mclntire collection, copyright 1988 by Zedler. Table 15. California least tern nesting data, 1982- abundant species on his beach site. The beach 1985 (from Least Tern Recovery Team, unpubl.). was most heavily used during July-August and least during December-January. Tijuana Estuary Cal~fornia -.__l-__.ll- -- I__-_ _ Year Nest~ng Pairs Fledglings Nest~ng Pars Belding's Savannah sparrows often forage on the dunes, especially when an abundance of kelp has washed ashore. The decaying kelp harbors large numbers of insects, especially flies. At Tijuana Estuary, several sparrows nest in small patches of pickleweed and saltgrass that are 1982 21 -30 17 1015-1245 1983 60-65 50+ 1196-1321 1984 66 1 2-20 931 -1 002 1985 32 1 8-20 1100-1112 surrounded by dunes and dune vegetation (White, pers. comm.). The dunes and beach habitats are dynam~c, and recent storm damage has altered the native communities. In order to open the estuary to tidal Boland (1981) found that six species of flushing, the sand that had blown and washed into shorebirds were abundant in his beach study site. the estuarine channels was dredged and replaced These included sanderling, willet, marbled godwit, on the dunes in December 1984. A revegetation whimbrei, snowy plover, and black-bellied plover. program designed to stabilize the dunes and Additional species that were not present on his prevent recurrence of mouth closure has been beach site but are commonly observed feeding in initiated (Jorgensen, pers. comm.; B. Fink, SDSU, in the intertidal beach areas include the least prog.). This program will examine the response of sandpiper, western sandpiper, and dowitcher. three native species, primrose, sand verbena, and Boland characterized the partitioning of beach dune ragweed, transplanted to the foredune, dune habitats on the basis of the depth of sediment that ridge, and backdune A complementary study on the prey organisms occupy and the depth of water ~nteractions between native (sand verbena) and in which the birds would forage. The results non-native (sea rocket, Cak~le maritrma) species is (Figure 49) describe feeding strategies of the six also in progress (Wood, in prog.)
Page 1 and 2:
June 1986 I THE ECOLOGY OF TIJUANA
Page 3 and 4:
The findings in this report are not
Page 5 and 6:
CONVERSION TABLE Metric to U.S. Cus
Page 7 and 8:
Page 4.5 Energy Flow ..............
Page 9 and 10:
Number Page The channel fish cornrn
Page 11 and 12:
ACKNOWLEDGMENTS The California Sea
Page 13 and 14:
Figure 1. Lacatlcrn of 71juana Estu
Page 15 and 16:
Figure 3. Map6 of Tijuana Estuary s
Page 17 and 18: FI(I(uPc$ 4. Wei&rahOt@ patt@rns of
Page 19 and 20: also limitrng Hot, dry desert winds
Page 21 and 22: 2.3 LAND USE HlSPQWV Through exami!
Page 23 and 24: The nearby bridge remained, and ext
Page 25 and 26: flushing until mid-December 1984. E
Page 27 and 28: with seawater. Even in years with s
Page 29 and 30: flats ~n winter but not in midsumme
Page 31 and 32: Each "island" of higher topography
Page 33 and 34: The vegetation and soils of the upp
Page 35 and 36: populations (Massey 1979) The brrds
Page 37 and 38: c~n~entrations of insects, especial
Page 39 and 40: Frgufe 29. The Ifght-footed clapper
Page 41 and 42: Figure 30. During winter (above) th
Page 43 and 44: anlmal footprints, In the hardpan f
Page 45 and 46: Tijuana Estuary salt marsh Such exp
Page 47 and 48: Frgura 36 The etraracrel an& tidal
Page 49 and 50: ^_ _I __"___I _-a_. -- fable 7. Inv
Page 51 and 52: Pre- 1980 (excluding Hosrner Rehse
Page 53 and 54: Table 8. Average density (number/m2
Page 55 and 56: changes in envlronment has not been
Page 57 and 58: was dominated by goby species, Cali
Page 59 and 60: compared the ,chthyoplankton commun
Page 61 and 62: Figure 43, Birds of the intertidal
Page 63 and 64: -" and that the community was compo
Page 65 and 66: Willet (1 73) i - Water Depth (cm)
Page 67: Table 14. Early information on dune
Page 71 and 72: CHAPTER 4 ECOSYSTEM FldNCTlONlNG St
Page 73 and 74: were no? irght-saturated untri expo
Page 75 and 76: Table 17. Conceptual model of chann
Page 77 and 78: Table 19. Net aboveground productiv
Page 79 and 80: _I___ I__-~--- 4.4.1 Nitragen Fluxe
Page 81 and 82: i i t 1 1 I Table 22. Standing crop
Page 83 and 84: calculated from chlorophyll a measu
Page 85 and 86: Dissolved Organic Biomass Carbon De
Page 87 and 88: CHAPTER 5 THE ROLE OF DISTURBANCES
Page 89 and 90: Table 25. Changes in elevation in t
Page 91 and 92: Table 26. Change in pickleweed cano
Page 93 and 94: Table 27. Occurrence (in circular 0
Page 95 and 96: perennials can survive long periods
Page 97 and 98: An experiment was designed to deter
Page 99 and 100: CHAPTER 6 MANAGEMENT CONSIDERATIONS
Page 101 and 102: Closely associated with the researc
Page 103 and 104: c. Dredging at Tijuana Estuary will
Page 105 and 106: Table 30. Predicted impacts of redu
Page 107 and 108: footed clapper rails; the picklewee
Page 109 and 110: overwashas, and slabiiizatran rs rl
Page 112 and 113: REFERENCES Allen, L.G. 1980. Struct
Page 114 and 115: Minsky, D. 1984. California least t
Page 116: 30272 -101 REPORT WUMENTATION 1. RE
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The Ecology of Tijuana Estuary, California: An Estuarine Profile

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