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41.
42.
Astrid Löffler Justyna Wolinska Barbara Keller Karl-Otto Rothhaupt Piet Spaak 《Freshwater Biology》2004,49(10):1372-1380
1. We investigated whether Daphnia galeata × hyalina hybrids of Lake Constance and Lake Greifensee show the same pattern of life history parameters as previously reported for D. galeata × cucullata hybrids and whether such a pattern is consistent between Daphnia populations from those two lakes. 2. Hybrids in Lake Constance were intermediate in size compared with the parental species. Hybrids in Lake Greifensee were smaller than D. galeata. The intrinsic growth rate (r) of hybrids from Lake Constance was not significantly different from the faster growing parental taxon D. galeata. However, r of hybrids from Lake Greifensee was significantly lower than that of D. galeata. 3. The observed juvenile body length differences between the taxa varied with the clutch number. The first clutch juvenile lengths of the three taxa did not differ for Lake Constance. First clutch juveniles of Lake Greifensee D. galeata were smaller than hybrid first clutch juveniles. The third clutch juvenile length did not differ between taxa from Lake Greifensee, but D. galeata juveniles from Lake Constance were bigger than those of D. hyalina. 4. The life history pattern found in Lake Constance corresponds to previous findings from other studies. The hybrids in this lake combine the faster population growth of one parental species with a relatively small size. In the case of Lake Greifensee hybrids, the relatively large size of first clutch juveniles and the small size of the adults could be interpreted as dual adaptations to invertebrate and fish predation. We speculate that the lower population growth rate of the hybrids is a trade‐off for this twofold protection. 相似文献
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Barbara Seliger Rudolf Lichtenfels Roland Kellner 《Briefings in Functional Genomics and Prot》2003,2(3):194-212
Proteome analysis has rapidly developed in the post-genome era and is now widely accepted as the complementary technology for genetic profiling. It has been shown to be a powerful tool for studying human diseases and for identifying novel prognostic, diagnostic and therapeutic markers. This review focuses on the identification of new biomarkers and therapeutic targets for renal cell carcinoma using different 'ome'-based technologies. 相似文献
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47.
Barbara C. Boyer 《Hydrobiologia》1995,305(1-3):217-222
In spiralian embryos determination of the axes of bilateral symmetry is associated with D quadrant specification. This can occur late through equal cleavage and cell interactions (conditional specification) or by the four-cell stage through unequal cleavage and cytoplasmic localization (autonomous specification). Freeman & Lundelius (1992) suggest that in spiralian coelomates the former method is ancestral and the latter derived, with evolutionary pressure to shorten metamorphosis resulting in early D quadrant determination through unequal cleavage and appearance of adult features in the larvae. Because of the key phylogenetic position of the turbellarian platyhelminthes, understanding the method of axis specification in this group is important in evaluating the hypothesis. Polyclad development, with equal quartet spiral cleavage, is believed to represent the most primitive condition among living turbellarians and has been examined experimentally in Hoploplana inquilina. Blastomere deletions at the two and four-cell stage produce larvae that are abnormal in morphology and symmetry, indicating that early development is not regulative, and also establish that the embryo does not have an invariant cell lineage. Deletions of micromeres and macromeres at the eight-cell stage indicate that cell interactions are involved in dorso-ventral axis determination, with cross-furrow macromeres playing a more significant role than non-cross-furrow cells. The results support the idea that conditional specification is the primitive developmental mode that characterized the common ancestor of the turbellarians and spiralian coelomates. Evolutionary trends in development in polyclads and other turbellarian orders are discussed. 相似文献
48.
New evidence for the systematic significance of acylated spermidines and flavonoids in pollen of Higher Hamamelidae 总被引:1,自引:0,他引:1
Barbara Meurer-Grimes 《Brittonia》1995,47(2):130-142
New distributional recores of hydroxycinnamoyl spermidines (HCS), including novel trisubstituted HCSs and flavonol glycosides,
in pollen of Higher Hamamelidae are presented. The 51 taxa analyzed by HPLC and TLC included members of the families Fagaceae
(Castanoideae, Fagoideae, Quercoideae), Betulaceae, Juglandaceae, Myricaceae, Hamamelidaceae, Rosaceae, and Buxaceae (Simmondsia). The results support generic concepts in the Higher Hamamelidae derived from morphological and chloroplast DNA data and
support a close evolutionary relationship between the Higher Hamamelidae and the Rosidae. 相似文献
49.
Barbara Thöni 《Journal of Ornithology》1997,138(3):315-324
Zusammenfassung Im Frühjahr 1995 (Febr.–Mai) wurden auf der Schwäbischen Alb 7 Kolkrabenpaare beobachtet. Ziel der Untersuchung war es den Aufwand der Altvögel für die Jungenaufzucht zu erfassen. Der Aufwand wurde über die Aktivität der Altvögel am Nest abgeschätzt und bezüglich der Jungenzahl und des Wetters ausgewertet. Paare, die mehrere Junge hatten, sparten beim Hudern Kosten ein, da sie ihre Jungen bis zu einem geringeren Alter hudern mußten und weniger stark von der Temperatur abhängig waren. Bei den Fütterungen verringerte sich die Fütterfrequenz pro Jungvogel mit zunehmender Jungenzahl, die absolute Anzahl an Fütterungen nahm jedoch zu. Der Aufwand für die Nesthygiene war unabhängig von der Jungenzahl. Selbst bei mehreren Jungen blieb Zeit für Komfortverhalten. Jungenaufzucht war also effektiver, wenn mehrere Jungen gleichzeitig aufgezogen wurden.
Parental expenditure for rearing nestlings by ravensCorvus corax
In spring 1995 (Feb.–May) I observed seven pairs of Raven in southern Germany on the Schwäbischen Alb. The aim was to record parental expenditure for rearing nestlings. Expenditure was assessed by recording the activities of the adults at their nest (mainly brooding and feeding the offspring) and was analysed with respect to the number of nestlings per brood and with respect to the weather. Pairs with more than one nestling saved effort by stopping brooding their offspring at a lower nestling age. Also brooding was less dependent on the ambient temperature for pairs with more than one nestling than for pairs with only one nestling. The feeding frequency per nestling has been lower, if there were more nestlings to feed. The total frequency of feeding increased with increasing number of nestlings per brood. The effort for the hygiene of the nest was independent upon the number of offspring per nest. Nevertheless, pairs with more than one nestling spent time for comfort behaviour. Thus, it was more effective to reare more than one nestling at a time.相似文献
50.
Barbara Płytycz 《Immunogenetics》1984,19(1):3-11
The major histocompatibility complex (MHC) zygosity of the field-collected frogs, Rana temporaria, was detected by progeny testing. Groups of sibling tadpoles were grafted with intrafamilial tail-tip allografts and the ratio of rapidly rejected allografts to slowly rejected ones was estimated. Twenty-five percent of parental frogs appeared to be MHC homozygotes. Thus, MHC homozygosity in natural frog populations seems to be considerably higher than in wild mouse populations. 相似文献