Hawkesbury-Nepean River Environmental Monitoring Program
Hawkesbury-Nepean River Environmental Monitoring Program
Hawkesbury-Nepean River Environmental Monitoring Program
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Figure 6.31: Multidimensional scaling ordination indicating seasonal patterns of algal<br />
communities at North Richmond, Site N42: all data (top); 2000s data only (bottom)<br />
Comparisons between Sackville (N26) and North Richmond (N42). Although<br />
there are many similarities in the algal communities at N42 and N26, there are also<br />
some important differences. Throughout the 1980s, when Anabaena was blooming at<br />
N42, it was also blooming at N26 (Figure 6.32). However, in the 1990s, Anabaena<br />
bloom formations at N26 were not accompanied by blooms of similar magnitude at<br />
N42. In contrast, when Microcystis was blooming at N26 it was occasionally blooming<br />
at N42 but with much lower cell counts (Figure 6.32). More recently, Aphanocapsa<br />
blooms have occurred at both N42 and N26, but cell counts have been much higher<br />
at N26 (Figure 6.32). In the past, significant blooms of some cyanobacterial genera<br />
60 <strong>Hawkesbury</strong> <strong>Nepean</strong> <strong>River</strong> <strong>Environmental</strong> <strong>Monitoring</strong> <strong>Program</strong>: Final Technical Report