The Ecology of Tijuana Estuary, California: An Estuarine Profile

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Figure 28. Insects of the cordgrass community. Two tiny dipterans, lncert (Hydrobaeninae), have larvae that live in and feed on cordgrass stems; Caleoptera: Coccinelidae) is abundant only on cordgrass; and the p Delphacidae) is found on cordgrass in all the marshes of this region. Mclntire
Frgufe 29. The Ifght-footed clapper rat! f~nds cover, food. and nesting material in the cordgrass marsh. Its nest is a mastsrptece of ecanstruct~on, wrth a fioatcng platform and protective arch, commonly made of cordgrass. Mclntire cotlrclgon, copyright 9 986 by Zedier the rails The (nil grass provides cover for cordgrass d~ed and the Tijuana Estuary popuiatlon p~r~lrctron ayatrrst ptedators and the b~rds weave a af ralis became ext~nct (Chapter 5) ~,rrropy (31 i~ve sterns Over lhelr nests iF~giire 29) Both tlw egg oncl broad nests are woven of dead The population of I~ght-footed clapper ralls at corcfgrdsa stems The nests lhat are anchored to Ttjuana Estuary has been censused frequently vertical cordgrass stems can float, thereby (Jorgensen 1975, Zembal and Massey 1981 a,b, P. prevent~ng siibmergence, the nests in cordgrass Jorgensen, Estuarine Sanctuary Manager, pers can be rnore Firrniy anchored Il.?an elsewhere. the comm ) Before 1985, the populat~on fluctuated lower mnrsh area5 are wetter and less accesstble between 25 and 41 breeding palrs (Table 5) The lo terrestrial predators. and the black-colored year with peak populat~on dens~ty was 1983, when chicks are camouflaged against tile black cordgrass vegetatron was luxuriant (Chapter 5) At substrafe af the lower rnarsh Finally, the~r most lhat time, T~juana Estuary supported 170g of the common fooas occur in or near areas where Stale's 249 breeding birds. Then, ioilo~ding the cordgrass IS abundant Yellow shore crabs and closure of the estuarine mouth rn 1984, the l~ned shore crabs were the don~inant ltems In March-April census of 1985 faded to locate any regurgitated pellets analyzed by Jorgensen 119751 raiis Recorded b~rd calls were used to socate Further evidence of ?he species' reiationshlp wlth terrrtorial pairs, btit no breedlng was tndlcated tidal cordgrass marshes developed In 1984 when Oniy four birds have been seen slnce then 28
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: c~n~entrations of insects, especial
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 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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