The Ecology of Tijuana Estuary, California: An Estuarine Profile

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Table 5. History of changes in the number of pairs of light-footed clapper rails at Tijuana Estuary. Data from Clapper Rail Recovery Team (unpubl.) and Jorgensen (pers. comm.). - - Year 1985 1981 1982 1903 1983 1985 Tijuana Estuary No, of Pairs - 2 6 3 1 25 4 1 38 oa Calffornfa Total Pars --- - - - - 203 173 221 249 277 142 "wo oirldrv~duals ware s~ghted In 1985 at t~rnes other !han the
Figure 30. During winter (above) the salt pannes accumulate water from high spring tides and rainfall: during summer they dry and are covered by a white salt crust. Algae and ditch grass (Ruppia maritima) grow during the aquatic phase: pintails and other aquatic birds feed and rest there. In summer, abundant burrows of a diverse insect carnmunity are present. Mctntire coileclion, ~opyright f 986 by Zedler. "middens." The density of middens reaches belt at about the high tlde line. The beetles appear 50Q/m2; the tunnels beneath them are about 20 crn to prefer soil dampened by t~dal inundation but not in depth Densities af beetles were highest in covered by standing water A typical biweekly March 1984, when 8 adults and 22 juveniles were fluctuat~on of midden dens~t~es occurs with the recorded per 1,650 cm3 core Reproduct~on high summer t~des: as a high tide recedes, midden occurred In the spring with eggs attached to the mounds appear as the beetles begin to burrow, s~des of burrows Dy means of a clear, threabiike more densely at the region where the soils have material begun to dry and iess densely at the water's edge; as the so11 dries, the middens accumulate as tntertrdal elevation ts the most important excavation activities continue; then, an ensuing physical variable that characterizes rove beette high tide erases the surface m~ddens, and the d$strrbut~on patterns They are densest In a narrow pattern IS repeated. It IS not known what happens
Page 1 and 2: June 1986 I THE ECOLOGY OF TIJUANA
Page 3 and 4: The findings in this report are not
Page 5 and 6: CONVERSION TABLE Metric to U.S. Cus
Page 7 and 8: Page 4.5 Energy Flow ..............
Page 9 and 10: Number Page The channel fish cornrn
Page 11 and 12: ACKNOWLEDGMENTS The California Sea
Page 13 and 14: Figure 1. Lacatlcrn of 71juana Estu
Page 15 and 16: Figure 3. Map6 of Tijuana Estuary s
Page 17 and 18: FI(I(uPc$ 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: Frgufe 29. The Ifght-footed clapper
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 and 68: Table 14. Early information on dune
Page 69 and 70: Figure 48. Birds that nest on the s
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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