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Adaptability and vulnerability of Riverine Biota to Climate Change – Developing Tools for Assessing Biological Effects
Expanded Title:Upper thermal limits, expressed as CTmax values (Critical Thermal maximum) and 96h ILUT(Incipient Lethal Upper Temperature) varied spatially amongst regions, with differences most evident amongst winter versus summer rainfall regions. Within-region variation was also apparent in the Western Cape, where both CTmax values and 96h ILUT varied by approximately 2 degrees amongst sites. CTmax values and 96h ILUT varied temporally with distinct differences between summer (highest) and winter (lowest), and less distinct and more variable differences in spring and autumn. CTmax values varied significantly amongst genera within families for five of the seven comparisons undertaken, suggesting that family level indicators of thermal alteration are not appropriate, instead finer taxonomic levels must be used. The thermal optimum for growth of L. penicillata was between 16°C and 18°C. Successful egg development and hatching occurred between 10°C and 20°C for L. penicillata and Aphanicercella scutata. For C. ambulans, successful hatching occurred at a wider range of temperatures from 10°C to 25°C. These variations further suggest that generalisations in terms of thermal guidelines made at a broad national-scale for the ecological Reserve are inappropriate and should at the very least need to be conceived at a regional or even local scale or site specific.dallas
Date Published:01/04/2015
Document Type:Research Report
Document Subjects:Ecosystem - Biodiversity protection
Document Keywords:Climate, Water Quality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2182/1/15
ISBN No:978-1-4312-0656-8
Authors:Dallas H; Ristow NE; Rivers-moore N; Ross-Gillespie V; Ramulifho P; Reizenberg J
Project No:K5/2182
Organizations:University of Cape Town; University of KwaZuIu-Natal; The Freshwater Research Centre
Document Size:2 491 KB
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