The Ecology of Tijuana Estuary, California: An Estuarine Profile

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Figure 26 Organ~ms 6t xire pgoai p~ois inci~de tile Yfvell algae fuppor kft crrc!ct. Enterofftorpba 90 (mulhc@llular branched lubes) and Rhfrocionrum spp {fiiarnenf~) several blue-green algae flower rtght circle), Mtcrocolaus iyngbyac~~s (wde filaments) and Schfrofnifx s@p ("W~OW ftiamrotsi and the dtatoms Gyrosrgma obbquum (in tubes) and Trachyners aspera [tower left) The fly (E~hydra. Ephydt~dae, upper right), 1s abundant: adults feed on dlafoms the larvae on algae The water bsafman Cfflchcacortxia rolrcu/ata, left m~ddle) can be rxtremeb dense In the: pools The sma!! noituscs, rilss~rn~nee and Mc"iampus (lower right), feed upon the algae and detrttus. the Gallfornsa ktll,f!sh (lower left] feeds on arfhropods Mcrntire collectton copyrtght 3 986 by Zedier
c~n~entrations of insects, especially water boatmen (Tr,chocor,x/a spp 1, occur in the pools typifies this community (~~gure 271 Cordgrass has proven easy to monitor (Zedler 1983b), amenable They feed on the algae and in turn provide food for to transplantation (Zedler 19841. and responsive to the Californta killtflsh (Fundulus parv~p~nn,~), which manipulative experimentation (~ovin 1984) still, spawn and develop in these pools (Fritz 1975) our knowledge of the total community is incomplete Insects that live in and on the cordgrass are just beginning to be studied (Figure A varletY of birds are often Seen foraging in the 28, covin ,986) with new species midmarsh hab~tat Common are the wlllet that are new to science are (e g , (Catoptrophorus seml~almatus), marbled godwit /ncerte//a sp and Cr,cotopus sp , Figure 28) Both (Llm0Sa fedoa), long-billed curlew (Numenlus of these tiny have larvae that live w,thln the amencanus), great blue heron (Ardea herodtas), leaves of cordgrass (J covln, SDSU, pers comm ) Common egret (Casrnerodlus albus), and Beldlng's H~~~ snails, lined shore crabs (Pachygrapsus Savannah sparrow (Wh~te, pers comm ) crasslpes), and yellow shore crabs (Hemlgrapsus oregonens~s) are abundant, but their hab~ts are not The lower marsh of Tijuana Estuary is the most well known They feed on the algal mats and well-studied habitat of the entire system The detrltus and are themselves eaten by the larger dominant plant, Pacif~ cordgrass (Spartlna fol~osa), marsh birds Figure 27. The cord~rass community. showing the fiddler crab (right) and the lined shore crab (in burrow). California horn snails are attached to the cordgrass stems and on the mud. A California least tern is poised, ready to dive for fish in the channel. Mclntire cotlection, copyright 1986 by Zedler.
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: populations (Massey 1979) The brrds
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 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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