Semeniuk, 2000; Bezerra et al., 2006). Species with broad
environmental and habitat tolerances are able to exist
within a wider range of habitats or tolerate greater
fluctuation in environmental changes and thus cross over
zones, while environmentally restricted species do not.
For instance, within a suite of adjoining habitats varying
from sand to muddy sand to mud, and varying from saline
to hypersaline, or varying from subtidal to tidal flat, some
species occur across habitat boundaries, while others
are environmentally restricted (Figure 8). Species zonation
Species Zonation, Figure 9 Zonation of mollusks in an estuary across the various habitats in upper estuarine, middle estuarine, and
deltaic fields (information from Semeniuk and Wurm, 2000). Species illustrating zonation are: Hydrococcus brazieri, Arthritica semen,
Acteocina sp., Bedeva paivae, Nassarius burchardi, Sanguinolaria biradiata, Spisula trigonella, Tellina deltoidalis, and Xenostrobus
securis.
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SPECIES ZONATION
environmental and habitat tolerances are able to exist
within a wider range of habitats or tolerate greater
fluctuation in environmental changes and thus cross over
zones, while environmentally restricted species do not.
For instance, within a suite of adjoining habitats varying
from sand to muddy sand to mud, and varying from saline
to hypersaline, or varying from subtidal to tidal flat, some
species occur across habitat boundaries, while others
are environmentally restricted (Figure 8). Species zonation
Species Zonation, Figure 9 Zonation of mollusks in an estuary across the various habitats in upper estuarine, middle estuarine, and
deltaic fields (information from Semeniuk and Wurm, 2000). Species illustrating zonation are: Hydrococcus brazieri, Arthritica semen,
Acteocina sp., Bedeva paivae, Nassarius burchardi, Sanguinolaria biradiata, Spisula trigonella, Tellina deltoidalis, and Xenostrobus
securis.
620
SPECIES ZONATION