Assessing the congruence of thermal niche estimations derived from distribution and physiological data. A test using diving beetles.

A basic aim of ecology is to understand the determinants of organismal distribution, the niche concept and species distribution models providing key frameworks to approach the problem. As temperature is one of the most important factors affecting species distribution, the estimation of thermal limits is crucially important for inferring range constraints. It is expectable that thermal physiology data derived from laboratory experiments and species' occurrences may express different aspects of the species' niche. However, there is no study systematically testing this prediction in a given taxonomic group while controlling by potential phylogenetic inertia. We estimate the thermal niches of twelve Palaearctic diving beetles species using physiological data derived from experimental analyses in order to examine the extent to which these coincided with those estimated from distribution models based on observed occurrences. We found that thermal niche estimates derived from both approaches lack general congruence, and these results were similar before and after controlling by phylogeny. The congruence between potential distributions obtained from the two different procedures was also explored, and we found again that the percentage of agreement were not very high (~60%). We confirm that both thermal niche estimates derived from geographical and physiological data are likely to misrepresent the true range of climatic variation that these diving beetles are able to tolerate, and so these procedures could be considered as incomplete but complementary estimations of an inaccessible reality

Conspicuous Female Ornamentation and Tests of Male Mate Preference in Threespine Sticklebacks (Gasterosteus aculeatus)

Sexual selection drives the evolution of exaggerated male ornaments in many animal species. Female ornamentation is now acknowledged also to be common but is generally lesswell understood. One example is the recently documented red female throat coloration insome threespine stickleback (Gasterosteus aculeatus) populations. Although female sticklebacks often exhibit a preference for red male throat coloration, the possibility of sexual selection on female coloration has been little studied. Using sequential and simultaneousmate choice trials, we examined male mate preferences for female throat color, as well aspelvic spine color and standard length, using wild-captured threespine sticklebacks fromthe Little Campbell River, British Columbia. In a multivariate analysis, we found no evidencefor a population-level mate preference in males, suggesting the absence of directional sexual selection on these traits arising from male mate choice. Significant variation was detectedamong males in their preference functions, but this appeared to arise from differences intheir mean responsiveness across mating trials and not from variation in the strength (i.e.,slope) of their preference, suggesting the absence of individual-level preferences as well.When presented with conspecific intruder males, male response decreased as intruder redthroat coloration increased, suggesting that males can discriminate color and other aspectsof phenotype in our experiment and that males may use these traits in intrasexual interactions. The results presented here are the first to explicitly address male preference for female throat color in threespine sticklebacks

Lessons learned from renewable electricity marketing attempts: a case study

The choice of subscribing to renewable electricity has been available to Australian households for more than a decade, yet consumer uptake remains low for some green marketers. This case study uses a retailer's perspective to examine the implementation of a green marketing program for a renewable electricity retailer. Based on interviews, internal company documentation, and secondary research, findings show that effective differentiation for renewable energy is required to increase consumer involvement levels and the likelihood of consideration. While consumers lack understanding of, and interest in, renewable energy, the marketing program relied on customers to seek information. It was apparent the success of green marketing programs depends on the integration of education into a carefully targeted marketing program emphasizing functional and emotional values to differentiate renewable energy and simplify consumer decision-making processes

The genetic architecture of sexually selected traits in two natural populations of Drosophila montana

The work was supported by the National Environment Research Council (grant NE/E015255/1 to MGR and RKB) and the Academy of Finland (project 132619 to AH).We investigated the genetic architecture of courtship song and cuticular hydrocarbon traits in two phygenetically distinct populations of Drosophila montana. To study natural variation in these two important traits, we analysed within-population crosses among individuals sampled from the wild. Hence, the genetic variation analysed should represent that available for natural and sexual selection to act upon. In contrast to previous between-population crosses in this species, no major quantitative trait loci (QTLs) were detected, perhaps because the between-population QTLs were due to fixed differences between the populations. Partitioning the trait variation to chromosomes suggested a broadly polygenic genetic architecture of within-population variation, although some chromosomes explained more variation in one population compared with the other. Studies of natural variation provide an important contrast to crosses between species or divergent lines, but our analysis highlights recent concerns that segregating variation within populations for important quantitative ecological traits may largely consist of small effect alleles, difficult to detect with studies of moderate power.PostprintPeer reviewe