. Bulletin. Science. 222 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 1997 1997 1997 97/98 1998 1998 1998 98/99 1999 1999 Spr Sum Fall Win Spr Sum Fall Win Spr Sum Albula spp. TE Acanthogobius flavimanus TE LPL Ctenogobius sagittula Mugil spp. Callinectes arcuatus Penaeus californiensis TE LPL TE LPL TE LPL TE LPL 0 0 = <= <= <= <= < = <= 0 0 0 x Fig. 3. Mean density (per m2) of species collected with the seine (spring 1997 through summer 1999) that exhibited atyp
. Bulletin. Science. 222 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 1997 1997 1997 97/98 1998 1998 1998 98/99 1999 1999 Spr Sum Fall Win Spr Sum Fall Win Spr Sum Albula spp. TE Acanthogobius flavimanus TE LPL Ctenogobius sagittula Mugil spp. Callinectes arcuatus Penaeus californiensis TE LPL TE LPL TE LPL TE LPL 0 0 = <= <= <= <= < = <= 0 0 0 x Fig. 3. Mean density (per m2) of species collected with the seine (spring 1997 through summer 1999) that exhibited atypical abundance trends during the 1997-98 El Nino event. "X" indicates that individuals were observed in low numbers, but densities were not quantified. or completely new to the monitoring record. During 1997-98 we also documented shifts in abundance (increase or decrease) and/or size structure of three species that were common in the historical monitoring record. Descriptive analysis of these species trends includes the date of first collection, density and relative abun- dance, persistence in the estuary, size frequency, and discussion of life history. New/uncommon species.—Most of the fish and invertebrate species new to the 12-year monitoring record at TE and LPL in 1997-98 were collected as juveniles. Their appearance altered the relative abundance of common species and increased species richness in lagoon assemblages. New invertebrates were first collected in winter 1997-98, while fishes were collected later in the summer or fall of 1998, either due to differential catchability or real differences in larval arrival/avail- ability (Fig. 3). Each species exhibited variable periods of persistence in these estuaries. Although it appears that the abundance of several other species (Por- tunus xantusii—Xantus' swimming crab, Paralabrax nebulifer—barred sand bass, Menticirrhus undulatas—California corbina, and Pleuronichthys coenosus—C-O turbot) may also be co
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