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L. G. Abele 《Marine Biology》1976,38(3):263-278
The community structure of the decapod crustacean fauna of 7 tropical, shallowwater, marine habitats (sandy beaches, mangrove swamps and rocky intertidal habitats on both the Pacific and Caribbean coasts of Panama, and Pocillopora damicornis coral habitat of the Bay of Panama) were examined and analyzed for species composition and relative abundances. Collections from the 7 habitats yielded 4361 individuals, representing 236 species. The number of species per habitat was (Pacific, Caribbean): sandy beach (16, 7); mangrove (20, 17); P. damicornis (53); rocky intertidal (78, 67). There were more species represented by more individuals in the Pacific habitats. An index of faunal similarity was calculated for each pair (Pacific-Caribbean) of habitats. This index is the number of ecologically similar congeneric species which occurred in both habitats expressed as a percentage of the total number of species present in the pair of habitats. For the sandy beach communities there were three Pacific species which were similar to three Caribbean species, a similarity of 6/23 or 26%. The index of similarity for the mangrove communities is 54% and for the rocky intertidal communities it is 37%. The P. damicornis community has affinities with the Pacific rocky intertidal community (18%), with that of the Caribbean rocky intertidal (16%) and with that of Indo-West Pacific pocilloporid corals (20%). A few specialized species dominated each of the communities. The habitats and the number of species accounting for over half of the individuals present are (Pacific, Caribbean): sandy beach (1, 1); mangrove (4, 4); P. damicornis (5); and rocky intertidal (3, 6). Most of the species in each community were represented by one or a few individuals. 相似文献
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Harald Abele Philipp Wagner Jiri Sonek Markus Hoopmann Sara Brucker Burcu Artunc-Ulkumen Karl Oliver Kagan 《黑龙江环境通报》2015,35(12):1182-1186
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Karl Oliver Kagan Harald Abele Britta Yazdi Bettina Böer Klaus Pintoffl Dave Wright Markus Hoopmann 《黑龙江环境通报》2011,31(13):1229-1233
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Charles W. Slaughter Charles H. Racine Donald A. Walker Larry A. Johnson Gunars Abele 《Environmental management》1990,14(1):63-72
Use of off-road vehicles (ORVs) in permafrost-affected terrain of Alaska has increased sharply over the past two decades.
Until the early 1960s, most ORV use was by industry or government, which employed heavy vehicles such as industrial tractors
and tracked carriers. Smaller, commercial ORVs became available in the 1960s, with the variety and number in use rapidly increasing.
Wheeled and tracked ORVs, many used exclusively for recreation or subsistence harvesting by individuals, are now ubiquitous
in Alaska. This increased use has led to concern over the cumulative effects of such vehicles on vegetation, soils, and environmental
variables including off-site values.
Factors affecting impact and subsequent restoration include specific environmental setting; vegetation; presence and ice content
of permafrost; microtopography; vehicle design, weight, and ground pressure; traffic frequency; season of traffic; and individual
operator practices. Approaches for mitigating adverse effects of ORVs include regulation and zoning, terrain analysis and
sensitivity mapping, route selection, surface protection, and operator training.
We regret the untimely death of Gunars Abele on August 27, 1989; he was a valued colleague and good friend. 相似文献
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Cell proliferation and apoptosis were investigated in tissues of two bivalve species, Arctica islandica from the German Bight (age of bivalves: 33–98 years) and Iceland (7–148 years) and Aequipecten opercularis from the English Channel (2–4 years). High proliferation rates (10% nuclei dividing) and apoptosis in tissues of A. opercularis were in line with high-energy throughput and reduced investment into antioxidant defence mechanisms in the scallop. In contrast,
cell turnover was slow (<1% nuclei dividing) in A. islandica and similar in mantle, gill and adductor muscle between young and old individuals. In the heart, cell turnover rates decreased
with age, which indicates less-efficient removal of damaged cells in ageing A. islandica. Cell turnover rates, mass specific respiration and antioxidant enzyme activities were similar in German Bight and Iceland
ocean quahog. Variable maximum life expectancies in geographically separated A. islandica populations are determined by extrinsic factors rather than by fundamental physiological differences. 相似文献
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