Chapter 1 - Núria BONADA

Chapter 3
Temporary sites are characterized by high abundance of OCH taxa, together with some other
taxa as Mollusca, Oligochaeta and Crustacea. Dytiscidae is a temporary family in MedBasin,
South Africa and SWAustralia but not in California, whereas Haliplidae only have a high IV-
value in temporary sites of California. On the other hand, Gyrinidae is an indicator family only
of SWAustralia and MedBasin. Heteroptera are exclusively temporary families, but Odonata
have permanent and temporary taxa. Lestidae, Gomphidae and Coenagrionidae are temporary
families in California. Coenagrionidae also is a temporary family in SWAustralia but a
permanent in South Africa. Similar divergences are observed with Gomphidae, a significant
Odonata family found in permanent sites in MedBasin but with a high IV-value in temporary
sites of California. Crustaceans and Mollusca appear to be more indicator taxa from temporary
than permanent sites, with Planorbidae present in MedBasin and California, or Lymnaeidae
common in MedBasin and Physidae in California. Other taxa are present in temporary sites in
all med-regions, as Ostracoda or Oligochaeta.
CALIFORNIA 54.2% MEDBASIN
42.9 %
33.3%
68.8%
SOUTH AFRICA 94.4% SW AUSTRALIA
Figure 9. Percentages of similarity between med-regions considering common abundant and
representative (IV-value) taxa for each pair of med-regions, in permanent and temporary sites.
Figure 9 displays percentages of similarities in macroinvertebrate responses under
permanency and temporality between each pair of med-regions. These similarity values were
obtained using common taxa with high IV-values (very abundant and representative) present
between pair of med-regions. When comparing two med-regions if a common family was
representative from different conditions (permanent or temporary) in one region respect to the
112
82.4 %