. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 Bulletin Museum of Comparative Zoology, Vol. 145, No. 3 j 5-10 breeding records. 11-20 breeding records more than 20 breeding records 12345678 Figure 1. "Niche Breadth" Distribution and Sample Size 10 11 12 13 14 the median is Although species with less than five breeding records were ex- cluded, the B values are still correlated with sample size, and further sampling would probably eliminate several species from the first class (). The majority of ciids appear to breed in several hosts, w
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 Bulletin Museum of Comparative Zoology, Vol. 145, No. 3 j 5-10 breeding records. 11-20 breeding records more than 20 breeding records 12345678 Figure 1. "Niche Breadth" Distribution and Sample Size 10 11 12 13 14 the median is Although species with less than five breeding records were ex- cluded, the B values are still correlated with sample size, and further sampling would probably eliminate several species from the first class (). The majority of ciids appear to breed in several hosts, with a preference for one or two. In inteipreting these values, it must be remembered that the calculations are based on all breeding records throughout the geographic range (which may be several thousand miles in diameter), and that no consideration has been given to the abundance of certain fungus species or the number of potential hosts to which a ciid has access. The second value, Bg, based on the genera of fungi discussed on pages 169-175, gives a better idea of which species prefer a group of phylogenetically related fungi, which possess one or several sporophore characters in common and thus may be considered as one type of habitat or food source. It has been calculated for selected species, in or- der to illustrate how it compares with Bs in group-specific ciids and with those which are apparently less discriminate. The best example of a group-specific species with a high Bs is Malacocis brevicollis; although is and the number of breeding hosts is nine, almost all of the fungi are in the genus Phellinus, so that Bg is only In other species, such as Cis hirsiitus, Bg is not much lower than Bs. Headquarters and Host Preference Groups Paviour-Smith (1960a), in her study of host utilization by Ciidae inhabiting Wytham Woods, near Oxford, England, found that the beetles could be divided into two breeding groups and the fungi into two corresponding habitat groups
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