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931.
(E)-6,10-dimethyl-5,9-undecadien-2-ol (geranyl acetol), termed here fuscol, was identified as a male-produced pheromone emitted
by Tetropium fuscum (F.) and Tetropium cinnamopterum Kirby. In field experiments, traps baited with synthetic fuscol alone were not significantly attractive, but the combination
of fuscol plus host volatiles (a synthetic blend of monoterpenes plus ethanol) attracted significantly more male and female
T. fuscum and female T. cinnamopterum than did host volatiles alone. This is the first homoterpenoid alcohol to be described in the Cerambycidae, and the first
pheromone reported from the sub-family Spondylidinae. 相似文献
932.
Although Asia is thought to have played a critical role in the radiation of artiodactyls, the fossil record of stem selenodonts
(“dichobunoids”) remains dramatically poor in tropical Asian regions. In this study, we report a new dichobunid genus and
species Cadutherium kyaukmagyii and a new basal ruminant genus and species Irrawadymeryx pondaungi, from the late Middle Eocene Pondaung Formation, Central Myanmar. Although the scarcity of the present material prevents
any attempts to investigate the phylogenetic relationships of Cadutherium with contemporaneous forms from other Holarctic landmasses, this new form shed new light on the diversity of these small
rabbit-like ungulates during a key period of their evolutionary history. Reexamination of the small-bodied artiodactyls from
Pondaung leads us to propose new identifications of certain published specimens and, in turn, to investigate the temporal
and geographic distribution of taxa recognized in the Pondaung Formation. Although fragmentary, these potential new taxa reveal
an unsuspected diversity of small forms among artiodactyls of Pondaung. This addition to the Eocene record of dichobunoids
and early ruminants provides further insight in the diversity of dental patterns among small artiodactyls from the Pondaung
Formation and attests to the antiquity of these groups in Southeast Asia. 相似文献
933.
Last Glacial mammals in South America: a new scenario from the Tarija Basin (Bolivia) 总被引:2,自引:0,他引:2
Coltorti M Abbazzi L Ferretti MP Iacumin P Rios FP Pellegrini M Pieruccini P Rustioni M Tito G Rook L 《Die Naturwissenschaften》2007,94(4):288-299
The chronology, sedimentary history, and paleoecology of the Tarija Basin (Bolivia), one of the richest Pleistocene mammalian
sites in South America, are revised here based on a multidisciplinary study, including stratigraphy, sedimentology, geomorphology,
paleontology, isotope geochemistry, and 14C geochronology. Previous studies have indicated a Middle Pleistocene age for this classic locality. We have been able to
obtain a series of 14C dates encompassing all the fossil-bearing sequences previously studied in the Tarija Basin. The dated layers range in age
from about 44,000 to 21,000 radiocarbon years before present (BP), indicating that the Tarija fauna is much younger than previously
thought. Glacial advances correlated to marine isotopic stages (MIS) 4 and 2 (ca. 62 and 20 ka BP, respectively) are also
documented at the base and at the very top of the Tarija–Padcaya succession, respectively, indicating that the Bolivian Altiplano
was not dry but sustained an ice cap during the Last Glacial Maximum. The results of this multidisciplinary study enable us
to redefine the chronological limits of the Tarija sequence and of its faunal assemblage and to shift this paleontological,
paleoclimatological, and paleoecological framework to the time interval from MIS 4 to MIS 2. 相似文献
934.
A male gift to its partner? Cyanogenic glycosides in the spermatophore of longwing butterflies (<Emphasis Type="Italic">Heliconius</Emphasis>) 总被引:1,自引:0,他引:1
Males of several insect species transfer nuptial gifts to females during mating, typically in the form of a protein-rich spermatophore.
In chemically defended species, males could potentially enhance such a gift with chemicals that help protect the female, her
eggs, or both. This was shown for lepidopteran species that accumulate pyrrolizidine alkaloids. Most Heliconius butterflies are presumably protected from predators by virtue of de novo synthesized and/or sequestered cyanogenic glycosides.
Males of Heliconius species are known to transfer nutritional gifts to the females but whether defensive chemicals could also be transferred
is not known. To ascertain whether transfer of cyanogens occurs, we dissected freshly mated females from nine different Heliconius species and analyzed spermatophores for cyanogenic glycosides. We found cyanogens in the spermatophores of all nine species.
This is the first time cyanogenic glycosides are reported in the spermatophores of arthropods. We discuss the implications
of these findings for Heliconius biology and for other cyanogenic insects as well. We suggest that chemically defended species commonly lace their nuptial
gifts with defensive chemicals to improve gift quality. 相似文献
935.
Ghostin J Habib-Jiwan JL Rozenberg R Daloze D Pasteels JM Braekman JC 《Die Naturwissenschaften》2007,94(7):601-605
The adults of the leaf beetle Platyphora kollari (Chrysomelidae) are able to metabolise the oleanane triterpene β-amyrin (1) into the glycoside 3-O-β-d-glucopyranosyl-(1→4)-β-d-glucuronopyranosyl-hederagenin (2) that is stored in their defensive glands. The aim of this study was to test the hypothesis that oleanolic acid (3) is an intermediate in the conversion of 1 into 2 and to check whether the sequestration of pentacyclic triterpenes is selective in favour of β-amyrin (1). To this end, adults of P. kollari were fed with Ipomoea batatas leaf disks painted with a solution of [2,2,3-2H3]oleanolic acid or [2,2,3-2H3]α-amyrin and the secretion of their defensive glands analysed by HPLC–ESIMS. The data presented in this work indicated that
the first step of the transformation of β-amyrin (1) into the sequestered glycoside 2 is its oxidation into oleanolic acid (3) and that this conversion is selective but not specific in favour of β-amyrin (1). 相似文献
936.
INTRODUCTION: Nearly all direct observation studies of safety belt use are conducted exclusively during daylight hours. Recent work has suggested that safety belt use at night may differ from daytime belt use. METHODS: An observational study of nighttime safety belt use, utilizing specialized night vision equipment, was conducted in Indiana surrounding the Click It or Ticket 2006 safety belt mobilization activities. A pre- and a post-mobilization statewide direct observation survey was conducted at night coinciding with daytime safety belt use data collection conducted by the state of Indiana. Daytime and nighttime belt use rates were compared. RESULTS: The comparisons across the mobilization period revealed a significant increase during the day, but a significant decrease at night. Comparisons between daytime and nighttime belt use revealed no overall difference during the pre wave, but a significant difference during the post wave. Finally, many common daytime trends in belt use were also found at night, with the exception of the typical age and seating position effects. DISCUSSION: The mobilization activities had a positive effect on daytime belt use, but no effect on nighttime belt use, likely resulting in the differences between daytime and nighttime belt use observed during the post wave. IMPACT ON INDUSTRY: The findings of this study suggest that safety belt mobilizations implemented only during the day do not influence nighttime safety belt use. Changes to how these programs are implemented or additional programs specifically targeting belt use at night should be considered, along with continued monitoring of nighttime belt use. 相似文献
937.
OBJECTIVES: Zero tolerance (ZT) laws have been effective in reducing alcohol-related crashes among underage drivers. However, enforcement in some states has not been rigorous, and ZT offenses may not be viewed as serious offenses. On July 1, 1994, the state of Washington implemented a ZT law that allowed police to request a test for alcohol on suspicion of either a ZT or driving-under-the-influence (DUI) offense. The present study examined effects of the ZT law on arrests and case dispositions among underage offenders as a function of blood alcohol concentration (BAC) and post-law patterns of recidivism. METHODS: Times-series analyses examined the effects of the ZT law on trends in arrests of underage drivers between 1991 and 1999. Based on arrest records matched with driver's license records, the effects of the law on dispositions of alcohol-related offenses among underage drivers were examined, and rates of recidivism among underage offenders were examined for the period following the ZT law. RESULTS: There was a substantial increase in arrests of underage drivers beginning immediately after implementation of the ZT law, especially among drivers with low BACs. The types of court or administrative dispositions received by underage offenders changed markedly after the ZT law was implemented. Underage offenders with lower BACs became far more likely to receive alcohol-related convictions and/or license suspensions. However, the percentage of underage offenders with higher BACs receiving DUI convictions declined as some of these offenders received the lesser ZT disposition. After the ZT law, underage offenders with BACs of 0.10 g/dL or higher were more likely to recidivate than those with lower BACs, but appreciable proportions of drivers were re-arrested for another alcohol offense, whatever the BAC and however they were penalized. CONCLUSIONS: Implementation of Washington's law indicates that a ZT law can increase the likelihood that an underage person will be sanctioned for drinking and driving. However, recidivism remains an issue as more than one in four underage drivers arrested with low BACs subsequently were re-arrested. 相似文献
938.
Jayant A. Sathaye Kenneth Andrasko 《Mitigation and Adaptation Strategies for Global Change》2007,12(6):971-1000
Climate change programs have largely used the project-specific approach for estimating baseline emissions of climate mitigation
projects. This approach is subjective, lacks transparency, can generate inconsistent baselines for similar projects, and is
likely to have high transaction costs. The use of regional baselines, which partially addresses these issues, has been reported
in the literature on forestry and agriculture projects, and in greenhouse gas (GHG) mitigation program guidance for them (e.g.,
WRI/WBCSD GHG Project Protocol, USDOE’s 1605(b) registry, UNFCCC’s Clean Development Mechanism). This paper provides an assessment
of project-specific and regional baselines approaches for key baseline tasks, using project and program examples. The regional
experience to date is then synthesized into generic steps that are referred to as Stratified Regional Baselines (SRB). Regional
approaches generally, and SRB in particular explicitly acknowledge the heterogeneity of carbon density, land use change, and
other key baseline driver variables across a landscape. SRB focuses on providing guidance on how to stratify lands into parcels
with relatively homogeneous characteristics to estimate conservative baselines within a GHG assessment boundary, by applying
systematic methods to determine the boundary and time period for input data.
相似文献
Kenneth AndraskoEmail: |
939.
Integrated strategies to reduce vulnerability and advance adaptation,mitigation, and sustainable development 总被引:4,自引:1,他引:3
Indur M. Goklany 《Mitigation and Adaptation Strategies for Global Change》2007,12(5):755-786
Determinants of adaptive and mitigative capacities (e.g., availability of technological options, and access to economic resources,
social capital and human capital) largely overlap. Several factors underlying or related to these determinants are themselves
indicators of sustainable development (e.g., per capita income; and various public health, education and research indices).
Moreover, climate change could exacerbate existing climate-sensitive hurdles to sustainable development (e.g., hunger, malaria,
water shortage, coastal flooding and threats to biodiversity) faced specifically by many developing countries. Based on these
commonalities, the paper identifies integrated approaches to formulating strategies and measures to concurrently advance adaptation,
mitigation and sustainable development. These approaches range from broadly moving sustainable development forward (by developing
and/or nurturing institutions, policies and infrastructure to stimulate economic development, technological change, human
and social capital, and reducing specific barriers to sustainable development) to reducing vulnerabilities to urgent climate-sensitive
risks that hinder sustainable development and would worsen with climate change. The resulting sustainable economic development
would also help reduce birth rates, which could mitigate climate change and reduce the population exposed to climate change
and climate-sensitive risks, thereby reducing impacts, and the demand for adaptation. The paper also offers a portfolio of
pro-active strategies and measures consistent with the above approaches, including example measures that would simultaneously
reduce pressures on biodiversity, hunger, and carbon sinks. Finally it addresses some common misconceptions that could hamper
fuller integration of adaptation and mitigation, including the notions that adaptation may be unsuitable for natural systems,
and mitigation should necessarily have primacy over adaptation.
相似文献
Indur M. GoklanyEmail: |
940.
Preety M. Bhandari Suruchi Bhadwal Ulka Kelkar 《Mitigation and Adaptation Strategies for Global Change》2007,12(5):919-933
India occupies 2.4% of the world’s geographical area with a large percentage of its land under agriculture. About 228 Million
hectares (Mha) of its geographical area (nearly 69%) fall within the dryland (arid, semi-arid and dry sub-humid) region. Of
the total cultivated area of 142 Mha, major part of agriculture in the country is rainfed, extending to over 97 Mha and constituting
nearly 68% of the net cultivated area, therefore making the agricultural sector vulnerable and exposed to the vagaries of
weather conditions. Climate change adds to this dimension of stress. A strong need is felt for targeting programmes in these
areas that address issues related to employing suitable soil and water conservation measures. In this context this paper seeks
to examine the case for watershed development as an adaptive strategy. An examination of the possibility of fortifying the
existing programme with a view to adapting to expected changes in climate in future is undertaken. Also, the possibility of
watershed development integrating into a suitable mitigation strategy for the country is assessed.
相似文献
Preety M. BhandariEmail: |