callosobruchus maculatus bean preference

In our case, assortative mating evolved rapidly, but since there was no selection against hybrids, the linkage between food preference and mating preference was quickly destroyed by recombination. There are three possible explanations for the deficiency of heterozygotes in the first generations selection, assortative mating and inbreeding. Yes We are grateful to S. Via and A. Ödeen for constructive critique on the paper. But what would happen if two strains selected on separate host plants in allopatry come into secondary contact (in sympatry or parapatry)? We estimated the multinomial proportions (the two homozygotes and the heterozygote) with a Dirichlet distribution as the prior and used 106 updates, after a burn-in of 10 000 steps. %PDF-1.5 Since host performance did not evolve alongside host preference, no fitness consequences seem to have resulted from the selection. We also found significant deviations from Hardy-Weinberg expectations in terms of a strong deficit of heterozygotes in the first two generations, while this changed to a significant excess of heterozygotes later on. The deficit of heterozygotes in the early generations did not correspond to a lower viability of heterozygotes, as evident when comparing the number of adults that emerged of the different morphs (brown morph 548.0±45.1,; intermediate 512.0±28.0; black 459.3±4.09, mean ± SE number of adults, P = 0.67, Kruskal-Wallis test). Selection lasted for ten generations during which we selected the ten most distinct (brown or black) males and females from each generation from a population of several hundred individuals per line. endobj 2 0 obj The assortative mating that occurred was not based on colour, as females of both colour morphs mated as readily with black as with brown males (9 brown vs. 12 black, X2 = 0.43, P = 0.51, df = 1). s + α >1. Since we did not obtain this pattern after only one generation on a novel resource, the result is unlikely to be a result of larval conditioning or maternal effects. We employed artificial selection for the two different colour morphs (black and brown), and allowed natural selection on two alternative food resources (black-eyed (BE) beans and mung (M) beans, Vigna radiata (L.)). Changes in the frequency of heterozygotes over the different periods are a result of a redistribution of alleles among homozygotes and heterozygotes as a result of changing mating patterns, and not due to a change in allele frequencies as a result of selection. On the other hand, replicate 3 did not have an excess at all, but instead developed a significant deficit over time (see Figure 2a–e). Is the Subject Area "Eggs" applicable to this article? Eggs are deposited (=oviposition) singly and several days after oviposition, a beetle larva (maggot) burrows into the bean. No, Is the Subject Area "Natural selection" applicable to this article? Since we did not obtain this pattern after only one generation on a novel resource, the … One possible scenario where the above mentioned models might apply is when a host shift occurs in phytophagous insects [12]-[14]. In a no‐choice situation, the developmental period from egg to adult was prolonged on the bean variety Kpodjiguegue. x��[Y��6~7����]i1�I�H�g�Y8�Ɠ �q4��im�R[�L�_�u�:�e�1�E��u~dn^�}��7����7/�>�십���ms������1�/�/����p���?�|[��|�|��yy����[����?N � '���B' R?vn0���s��{zJ�ӷϟ��:�o��wϟ�jLQ�QT�/f������s��`��r�O�'�ӈ�K?J�{�'��c9��N[���W�s�#����w��`�G����*�� r�$���3�bF�q�+'�Q L��޵r�E�n�?��nQ��w��8�� ��w^�B��i9����v��uv���a�Ma@����,��@�� � �N���&�D"��G8Ƶ��y��_w��v����H��0�$����OS��b��EEt6��5��E��ݪ�h���$��Y�"��8�S�Q⇱�S�^,�Ϟܪ�a :��gO� PZ�ꮜ�P����!�l"�yS�L�0�;xV��y�L�v��q ����:s��{=�������_��h+|i��.�@��� First, we found no fitness differences between the heterozygotes and the homozygotes. Our results are in accordance with Wasserman and Futuyma [23] who found a positive response to selection for ovipositional preferences after eleven generations of selection in the same species and Messina et al. After egg-laying, we separated the resources and upon emergence of the F1 generation, we counted the distributions of the different morphs on each resource. In the third generation, four lines showed a significant deficit of heterozygotes, while two lines showed a significant excess of heterozygotes (mean I  = −0.02±0.043; Figure 2c). However, if this were the case, then both a deficit and an excess in heterozygotes would be expected. 1 0 obj However, consistent with models of speciation, assortative mating alone is not sufficient to maintain reproductive isolation when individuals disperse freely between hosts. Eggs are layed singly, and hatch into larvae (maggots) several days later. The colour of the male accepted by the female was noted, as was the time elapsed before each mating started and the duration of each mating event. Generational Bean Preference in Callosobruchus maculatus Beetles Our Presentation: Introduction Additionally, it has been shown that polyphagous butterflies have a sex-linked inheritance of host-plant preference (Janz, 1998). In this study we used a laboratory population of the Cowpea weevil, Callosobruchus maculatus (Fabr. It would be more likely that mate choice is based on some other, nonvisual cue, such as smell for example.

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