解剖学和形态学
麻醉学
听力与言语-语言病理学
行为科学
心脏和心血管系统
细胞和组织工程学
临床神经病学
危重症监护医学
牙科,口腔外科和医学
皮肤病学
急诊医学
内分泌学和新陈代谢
肠胃学和肝脏学
老人病学和老年医学
卫生保健科学和服务
血液学
免疫学
传染病
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医学伦理学
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医学,全科和内科
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神经系统科学
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产科医学和妇科医学
肿瘤学
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整形外科学
耳鼻喉科学
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儿科学
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药理学和药剂学
生理学
基本医疗保健
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公共、环境和职业卫生
放射学,核医学和医学成像
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热带医学
泌尿学和肾脏学
病毒学
老年医学
健康政策和服务
心理学,临床
abstract::Because of a hard seed coat, entirely preventing absorption of water in desert species ofSida, germination is rendered impossible or difficult under laboratry conditions. This block was eliminated by high temperature pretreatments to ensure better germination. The seeds could tolerate extremely high temperatures for s...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00389108
更新日期:1971-12-01 00:00:00
abstract::Leptopterna dolobrata (L.) (Holarctis) and Calocoris roseomaculatus (De Geer) (Palaearctis) are single-brooded in the whole range of their distribution and hibernate in the egg stage. Both species are active only for 21/2 months, while the egg stage lasts over 9 months.The main food plants of Leptopterna are Dactylis ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346473
更新日期:1971-09-01 00:00:00
abstract::Pycnogonum litorale has a terminal anecdysis. After attaining maturity it does not moult again. Maturity can be attained at different body size, the female usually being larger than the male.The pre-adult instar can also be entered at various body sizes. The duration of the pre-adult instar depends upon body size: At ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345215
更新日期:1971-09-01 00:00:00
abstract::The effect of water immersion on the non-parasitic stages of Boophilus microplus were investigated both under laboratory and field conditions. Survival of engorged female ticks was influenced by their age and the temperature of the water. Eggs and larvae were more resistant to submerison than were engorged females and...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00344915
更新日期:1971-09-01 00:00:00
abstract::1. The locomotor activity of European salamanders differs from species to species. At all stages of development Triturus vulgaris is more light-active, Salamandra salamandra is dark-active, while Triturus alpestris and cristatus occupy an intermediate position. 2. The activity of the larvae is high but the rhythm is n...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345813
更新日期:1971-06-01 00:00:00
abstract::The Egyptian Zygophyllum species, though limited in number, contribute in considerable measure to the desert vegetation. They represent a group of succulent plants which are drought resistant or salt tolerant living under severe dry climatic conditions. Their abundance is attributed to these characteristics in additio...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346359
更新日期:1971-06-01 00:00:00
abstract::Experiments are described that were designed to investigate the effects of food availability and rate of exploitation on the growth and production of populations of Folsomia candida (Willem). In an initial experiment in which there was excess food it was found that increasing the rate of exploitation resulted in incre...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346294
更新日期:1971-03-01 00:00:00
abstract::Studies on iron reduction and the mechanism of gley formation by nitrogen-fixing clostridia are reported. Up to 106 cells/g soil of anaerobic, nitrogen-fixing clostridia, capable of reducing iron (III)-oxide, were counted in samples taken from various top soils. In a gleyed subsoil as many as 105 bacteria per g soil, ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345718
更新日期:1971-01-01 00:00:00
abstract::Twenty nine harpacticoid copepods are new to Bermuda and significant changes are noted in the distribution records of several species. Six temporary groups are organized to separate the copepods on their apparent zoogeographical ranges: (1) cosmopolitan, (2) warm temperate-tropical, (3) North Atlantic, (4) North Atlan...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00815503
更新日期:1970-12-01 00:00:00
abstract::In the eight Pardosa species studied, aerial dispersal occurs generally in the young instars. The climatic conditions, particularly wind but also temperature and humidity, affect the occurrence of aerial dispersal. Within the different systematic groups in the genus, species with relatively high and relatively low dis...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00344884
更新日期:1970-09-01 00:00:00
abstract::Environmental size, as measured by cross-sectional area of the inhabited streams, and population density of Oxytrema proxima are related by the power function Y=8.074X -0.584, where Y=population density and X=cross-sectional area of the stream. Relationships were also found between maximum size and biomass and cross-s...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00345977
更新日期:1970-03-01 00:00:00
abstract::In the non-reproductive period, six species of brood parasites (4 cuckoos, 2 viduines) observed in Rhodesia and in the Kalahari were found to inhabit other areas than their hosts, being either nomadic or migratory in habit. They are hence exposed to different environmental conditions.Histological examination of the go...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00390385
更新日期:1969-09-01 00:00:00
abstract::The diurnal periodicity of emergence of several stonefly and mayfly species was studied on the shore of lake Mondsee, Austria. Nemoura cinerea (Plecoptera) emerges during the whole day with peaks in the morning and afternoon. The Ephemeroptera Leptophlebia marginata, Ephemera danica and Centroptilum luteolum emerge as...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00416985
更新日期:1969-08-01 00:00:00
abstract::1. The mortality of part of the Calathus melanocephalus (Linn.) population, which showed locomotory activity during autumn 1966 was studied in the following year. 2. Mortality occurs mainly during the winter; during the winter of 1966-1967 it was about 36-41% for normal males and females at Schiermonnikoog (Table 1). ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00386687
更新日期:1968-11-01 00:00:00