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261.
262.
There is general agreement that the diet of early hominins underwent dramatic changes shortly after the appearance of stone tools in the archaeological record. It is often assumed that this change is associated with dietary expansion to incorporate large mammal resources. Although other aspects of the hominin diet, such as aquatic or vegetal resources, are assumed to be a part of hominin subsistence, identifying evidence of these adaptations has proved difficult. Here we present a series of analyses that provide methodological support for the inclusion of aquatic resources in hominin dietary reconstructions. We suggest that bone surface modifications in aquatic species are morphologically distinguishable from bone surface modifications on terrestrial taxa. We relate these findings to differences that we document in the surface mechanical properties of the two types of bone, as reflected by significant differences in bone surface microhardness values between aquatic and terrestrial species. We hypothesize that the characteristics of bone surface modifications on aquatic taxa inhibit the ability of zooarchaeologists to consistently diagnose them correctly. Contingently, this difficulty influences correspondence levels between zooarchaeologists, and may therefore result in misinterpretation of the taphonomic history of early Pleistocene aquatic faunal assemblages. A blind test using aquatic specimens and a select group of 9 experienced zooarchaeologists as participants was designed to test this hypothesis. Investigation of 4 different possible explanations for blind test results suggest the dominant factors explaining patterning relate to (1) the specific methodologies employed to diagnose modifications on aquatic specimens and (2) the relative experience of participants with modifications on aquatic bone surfaces. Consequently we argue that an important component of early hominin diets may have hitherto been overlooked as a result of (a) the paucity of referential frameworks within which to identify such a component and (b) the inability of applied identification methodologies to consistently do so. 相似文献
263.
Quantifying Traces of Tool Use: A Novel Morphometric Analysis of Damage Patterns on Percussive Tools
Matthew V. Caruana Susana Carvalho David R. Braun Darya Presnyakova Michael Haslam Will Archer Rene Bobe John W. K. Harris 《PloS one》2014,9(11)
Percussive technology continues to play an increasingly important role in understanding the evolution of tool use. Comparing the archaeological record with extractive foraging behaviors in nonhuman primates has focused on percussive implements as a key to investigating the origins of lithic technology. Despite this, archaeological approaches towards percussive tools have been obscured by a lack of standardized methodologies. Central to this issue have been the use of qualitative, non-diagnostic techniques to identify percussive tools from archaeological contexts. Here we describe a new morphometric method for distinguishing anthropogenically-generated damage patterns on percussive tools from naturally damaged river cobbles. We employ a geomatic approach through the use of three-dimensional scanning and geographical information systems software to statistically quantify the identification process in percussive technology research. This will strengthen current technological analyses of percussive tools in archaeological frameworks and open new avenues for translating behavioral inferences of early hominins from percussive damage patterns. 相似文献
264.
Spliceosome Structure and Function 总被引:2,自引:0,他引:2
265.
Jordan G Kueneman Douglas C Woodhams Will Van Treuren Holly M Archer Rob Knight Valerie J McKenzie 《The ISME journal》2016,10(4):934-944
Increasingly, host-associated microbiota are recognized to mediate pathogen establishment, providing new ecological perspectives on health and disease. Amphibian skin-associated microbiota interact with the fungal pathogen, Batrachochytrium dendrobatidis (Bd), but little is known about microbial turnover during host development and associations with host immune function. We surveyed skin microbiota of Colorado''s endangered boreal toads (Anaxyrus boreas), sampling 181 toads across four life stages (tadpoles, metamorphs, subadults and adults). Our goals were to (1) understand variation in microbial community structure among individuals and sites, (2) characterize shifts in communities during development and (3) examine the prevalence and abundance of known Bd-inhibitory bacteria. We used high-throughput 16S and 18S rRNA gene sequencing (Illumina MiSeq) to characterize bacteria and microeukaryotes, respectively. Life stage had the largest effect on the toad skin microbial community, and site and Bd presence also contributed. Proteobacteria dominated tadpole microbial communities, but were later replaced by Actinobacteria. Microeukaryotes on tadpoles were dominated by the classes Alveolata and Stramenopiles, while fungal groups replaced these groups after metamorphosis. Using a novel database of Bd-inhibitory bacteria, we found fewer Bd-inhibitory bacteria in post-metamorphic stages correlated with increased skin fungi, suggesting that bacteria have a strong role in early developmental stages and reduce skin-associated fungi. 相似文献
266.
Abstract In October 1999, patches of dead and dying trees were identified in rainforest vegetation throughout the Tully Falls area in north Queensland, Australia. Previous incidents of patch death in the region had been attributed to Phytophthora cinnamomi. The distribution of P. cinnamomi was assessed by testing for its presence in seven sites displaying signs of dieback and seven sites that appeared healthy. Each site was a circular quadrat, 20‐m radius (total area = 1256.6 m2). Within each quadrat, two perpendicular line transects were constructed. A single soil sample (250 g) was taken at the centre point and at 1‐m intervals along each transect. All soil samples were tested for the presence of P. cinnamomi using a combination of lupin baiting, subsequent culturing and microscopic identification. Of the 1134 samples, 783 recorded positive responses. The mean number of positive responses was not significantly greater in patch death sites than in control sites, suggesting that at this scale of resolution the distribution of P. cinnamomi was uniform. However, at spatial scales of 1‐m intervals across transects the distribution of P. cinnamomi was random. 相似文献
267.
268.
Heidrun Feuchtmayr Dermot McKee Ian F. Harvey David Atkinson Brian Moss 《Hydrobiologia》2007,584(1):425-432
There is increasing concern about the effect of climate change on aquatic systems. We examined changes in macroinvertebrate
communities caused by increased temperature (3°C above ambient during summer only and continuous 3°C above ambient all year
round), influences of fish (Gasterosteus aculeatus L.) and addition of nutrients (nitrogen and phosphorus) in 48 large-scale (3000 l) tanks over a 2 year period. While numbers
of Isopoda, Chaoborus, Corixidae, Ephemeroptera, Notonectidae and Odonata were reduced by the presence of fish, nutrient addition caused isopods,
corixids, mayflies and odonates to increase in abundance. Impacts of temperature increase were surprisingly low, with only
gastropods increasing in heated tanks, suggesting that, overall abundances of most macroinvertebrate taxa will not be severely
affected by the predicted temperature rise. To determine if taxa were sampled representatively during the experiment, net
sweep samples taken towards the end of the experiment were compared with final macroinvertebrate abundances when the complete
contents of each tank were harvested. We found that net sweeping is an appropriate semi-quantitative method for most taxa
in mesocosm tanks. However, mites, coleopteran adults and larvae, dipterans and Chaoborus were not adequately sampled. This might explain why we could not detect any treatment effects of temperature, fish or nutrients
on mites, coleopterans and dipterans and calls for different sampling techniques for these taxa, especially in ponds with
vegetation stands. 相似文献
269.
Karl-Heinz Schmidt Heidrun Berressem Karl Georg Berressem und Marianne Demuth 《Journal of Ornithology》1985,126(1):63-71
Zusammenfassung In der Umgebung von Schlüchtern (50°21 N, 09°31 E) und im Stadtbereich Frankfurts (50°08 N, 08°38 E) wurden in mehreren Untersuchungsgebieten seit 1971 bzw. seit 1977 von Oktober/November bis Februar/März regelmäßige nächtliche Kontrollen von 1121 Nistkästen durchgeführt, und zwar in einzelnen Jahren in 3tägigen, wöchentlichen, 14tägigen und monatlichen Abständen. Für eine weitgehend vollständige Erfassung der relativ stabilen Population genügten monatliche Kontrollen. Bei nur einer Winterkontrolle wurde der Bestand erheblich unterschätzt: bei alten betrug der Schätzfehler mindestens 25 %, bei jungen mindestens 45 %. Kohlmeisen reagierten auf nächtliche Kontrollen mit einem Wechsel des Übernachtungsortes. Erst bei Kontrollabständen von 3 Tagen mied ein Teil der Population die Nistkästen. Regelmäßige Nachtkontrollen können zum Verständnis bestandsregulierender Prozesse wie Zu- und Abwanderung, Ansiedlung, Ortstreue und Wintermortalität beitragen.
Studies on Great Tits (Parus major) during winter — possibilities and limits of nocturnal checks
Summary 1121 nest boxes were regularly checked during night from October/November until February/March in the area of Schlüchtern (50°21 N, 09°31 E) since 1971 and since 1977 in the area of Frankfurt (50°08 N, 08°38 E). During that time the checking was done in three-day, weekly, bi-weekly and monthly intervals. A single monthly checking was sufficient for an extensive and complete estimation of the relative stable population. By only one winter checking the population was considerably underestimated: the estimation error was at least 25 % in old and at least 45 % in young . Great Tits reacted to night checking by changing their nocturnal roosting place. A portion of the population will keep clear of the nest boxes when checking is done in three-day intervals. It is being discussed as to what extent regular night checking contributes to the understanding of population regulating processes such as migration, settlement, site fidelity of native birds and winter mortality.相似文献
270.
Scanning electron microscopical investigations of fractures and corrosion casts of the spiracles from femaleA. walkerae ticks revealed a four-part structure, consisting of spiracular plate, ostium and macula forming the external closure, followed by the subostial space and the vestibulum of regulable volume, as well as the atrial chamber as the innermost part from which the main tracheal trunks originate. On the average, the spiracular plate was 158 m long and 188 m at the broadest width. It consisted of a thin, highly perforated external and a thick internal layer, which enclosed the interpedicellar space with numerous stout pedicels. In its posterior region, the spiracular plate was covered by the macula, which was up to 80 m in length and 110 m in width. The interpedicellar cavity opened into the subostial space measuring 95.5 m in length and 159.6m in width, which proceeded into the 112-m long vestibulum. The roof of the vestibulum was flexible and could be everted and inverted. Inverted, the roof formed a quadratic bulge with numerous deep cuticular folds, which confined the lumen of the vestibulum either partially or completely. In corrosion casts, the roof was everted to a length of up to 89.3 m. In the posterior part of the vestibulum, as well as in the initial fourth of the artrial chamber, numerous anvil-, cone-or drop-like cuticular projections were arranged in wedge-like fashion. The atrial chamber was almost spherical with a diameter of 138.4 m. Five main tracheal trunks of different luminal diameter as well as numerous channels opened into the atrial chamber. 相似文献