https://commons.ufh.ac.za/vital/access/manager/Index en-us 5 Unexpected genetic structure of mussel populations in South Africa: indigenous Perna perna and invasive Mytilus galloprovincialis https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74401 Wed 17 Jul 2024 10:53:22 SAST ]]> Phylogeographic structure of the caridean shrimp Palaemon peringueyi in South Africa: further evidence for intraspecific genetic units associated with marine biogeographic provinces https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74392 Wed 17 Jul 2024 09:02:57 SAST ]]> Lack of genetic differentiation among four sympatric southeast African intertidal limpets (Siphonariidae): phenotypic plasticity in a single species? https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74390 Wed 17 Jul 2024 06:04:03 SAST ]]> Implications of life history for genetic structure and migration rates of southern African coastal invertebrates: planktonic, abbreviated and direct development https://commons.ufh.ac.za/vital/access/manager/Repository/vital:74388 Wed 17 Jul 2024 05:50:17 SAST ]]> Climate change, genetics or human choice: why were the shells of mankind’s earliest ornament larger in the Pleistocene than in the Holocene? https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6952 Wed 10 Jul 2024 12:09:17 SAST ]]> Wave exposure effects on population structure and recruitment in the mussel Perna perna suggest regulation primarily through availability of recruits and food, not space https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6968 15 mm) densities for both shore types (P < 0.05) but the correlations were extremely weak (r 2 < 0.06 in each case). In areas with 100% cover, adult size (mean and maximum lengths) was greater on exposed sites, but density showed the reverse and was negatively correlated with maximum wave strength (r = −0.84). Despite differences in adult densities and sizes, biomass, which is a product of the two, showed no significant difference between the two shore types (ANOVA P > 0.05). Thus wave exposure dramatically affects density, recruitment and mussel size, but not recruitment timing or biomass where there is 100% cover, and mediates a three-way interaction among food supply, larval supply and intraspecific competition for space. In contrast to shores with saturation recruitment, mussel biomass here appears to be limited by recruit supply and constraints of food, especially on sheltered shores, while density is regulated through intraspecific competition for space primarily on exposed shores and at small spatial scales.]]> Fri 26 Apr 2024 10:45:35 SAST ]]>