Diel changes in the horizontal distribution of zooplankton in the littoral zone
of two shallow eutrophic lakes.
Despite the fact that YOY bluegill appeared in the littoral zone
1 mo later in 1992 than in 1991, bluegill in three of four lakes were essentially invulnerable to bass upon first appearance in the littoral zone
; [less than] 20% of the bluegill were considered vulnerable in Lawrence, TL2, and Warner.
The large number of new records for the lake established in the present study was due simply to sampling in a poorly explored habitat, the littoral zone
. Hence, the number of copepod species identified rose from 12 to 21, of cladocerans from 18 to 40, of rotifers from 60 to 112, and of testate amoebae from 1 to 48.
Benthics grew consistently better in the littoral zone
than in open water.
Analysis of colony density as a response variable excluded lake area and its correlates (watershed area, littoral zone
area, lake perimeter, total cover of floating leaved macrophytes, total cover of all macrophyte species) as potential predictor variables due to the likelihood of multicollinearity.
vernalis) have been reported in the littoral zone
of Marmara Island for the first time in this study.
In the littoral zone
, the highest densities of M uruguayensis occurred during the cool season (mean surface temperature 23.7 [+ or -] 1.2[degrees]C) and the lowest density occurred in the wann season (mean surface temperature 28.8 [+ or -] 1.3[degrees]C) (see Figure 2).
The presence of larvae in the littoral zone
in both estuaries correlated with date, depth, and all sampling devices, as well as with interaction terms (Table 3).
Zooplankton samples for stable isotope analyses were collected using a conical net of 65 [micro]m mesh, 50 cm in diameter, and 1.1 m long, taking horizontal and vertical tows in the open water zone and horizontal tows in the littoral zone
, and collecting water with a bucket below the aquatic macrophytes.
Both species also use the littoral zone
as reproductive habitat in Lago de Patzcuaro (Garcia de Leon, 1984), and these areas have been lost in more than 70% (Alcocer-Durand & Bernal-Brooks, 2002).
The littoral zone
was examined both in the protected Seongsan lagoon (33[degrees]27'2718"N, 126[degrees]56'00.39"E) and in the open bay (33[degrees]27'30.47"N, 126[degrees]56'05.49"E) at the cape with Sunrise Peak volcano (Figure 1).
The littoral zone
of the reservoir, where water abstraction for irrigation and human consumption occurs, is the most contaminated lake area (CHESF, 2004).