. The ecology of Tijuana Estuary, California : a national estuarine research reserve . Figure Insects of the cordgrass community. Two tiny dipterans, Incertella sp. (Chloropidae) and Cricotopus (Hydrobaeninae), have larvae that live in and feed on cordgrass stems; the beetle (Coleomegilla fuscilabris; Coleoptera; Coccinelidae) is abundant only on cordgrass; and the plant- hopper (Prokelisia; Homoptera: Delphacidae) is found on cordgrass in all the marshes of this region. Mclntire collection, © 1986 by Zedler. Rails are censused in winter when tides exceeded m ( ft) MLLW and in sum
. The ecology of Tijuana Estuary, California : a national estuarine research reserve . Figure Insects of the cordgrass community. Two tiny dipterans, Incertella sp. (Chloropidae) and Cricotopus (Hydrobaeninae), have larvae that live in and feed on cordgrass stems; the beetle (Coleomegilla fuscilabris; Coleoptera; Coccinelidae) is abundant only on cordgrass; and the plant- hopper (Prokelisia; Homoptera: Delphacidae) is found on cordgrass in all the marshes of this region. Mclntire collection, © 1986 by Zedler. Rails are censused in winter when tides exceeded m ( ft) MLLW and in summer using taped vocalizations. Thirty-four breeding pairs were identified in 1974, of which 18 were in tall cordgrass, 11 in middle marsh, 4 in short cordgrass, and 1 in high marsh. Nesting density (number per area of habitat type) was greatest (about 3/ha or ) in tall cordgrass. The average elevation at which nests occurred was m ( ft) MLLW, which corresponded to the mean daily higher high tide (MHHW). The highest density of nests was observed in the northern arm of the estuary, where the single highest winter census count was 55 individuals. In comparison, a maximum of nine birds was counted in the area near the mouth of the estuary, and at most four in the southern arm of the estuary, where cordgrass 37
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