全文获取类型
收费全文 | 71篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
83篇 |
出版年
2021年 | 1篇 |
2019年 | 1篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 3篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有83条查询结果,搜索用时 0 毫秒
81.
Ierecê ML Rosa Rômulo RN Alves Kallyne M Bonifácio José S Mourão Frederico M Osório Tacyana PR Oliveira Mara C Nottingham 《Journal of ethnobiology and ethnomedicine》2005,1(1):1-15
From a conservationist perspective, seahorses are threatened fishes. Concomitantly, from a socioeconomic perspective, they represent a source of income to many fishing communities in developing countries. An integration between these two views requires, among other things, the recognition that seahorse fishers have knowledge and abilities that can assist the implementation of conservation strategies and of management plans for seahorses and their habitats. This paper documents the knowledge held by Brazilian fishers on the biology and ecology of the longsnout seahorse Hippocampus reidi. Its aims were to explore collaborative approaches to seahorse conservation and management in Brazil; to assess fishers' perception of seahorse biology and ecology, in the context evaluating potential management options; to increase fishers' involvement with seahorse conservation in Brazil. Data were obtained through questionnaires and interviews made during field surveys conducted in fishing villages located in the States of Piauí, Ceará, Paraíba, Maranhão, Pernambuco and Pará. We consider the following aspects as positive for the conservation of seahorses and their habitats in Brazil: fishers were willing to dialogue with researchers; although captures and/or trade of brooding seahorses occurred, most interviewees recognized the importance of reproduction to the maintenance of seahorses in the wild (and therefore of their source of income), and expressed concern over population declines; fishers associated the presence of a ventral pouch with reproduction in seahorses (regardless of them knowing which sex bears the pouch), and this may facilitate the construction of collaborative management options designed to eliminate captures of brooding specimens; fishers recognized microhabitats of importance to the maintenance of seahorse wild populations; fishers who kept seahorses in captivity tended to recognize the condtions as poor, and as being a cause of seahorse mortality. 相似文献
82.
Andrew ML Lever 《Retrovirology》2006,3(1):1-4
The 2006 M Jeang Retrovirology Prize for HIV research has been awarded to Dr Joe Sodroski 相似文献
83.
Bahía San Sebastián (BSS), a shallow and protected environment on the eastern coast of Tierra del Fuego (Argentina), is a
prime habitat for several species of nearctic migratory birds that visit the area during summer to feed in its huge intertidal
mudflats. The area has also great economic value due to the extraction and transport of hydrocarbons. Twenty-three dredge
stations were analysed and presence/absence data were used to classify stations and species by cluster analysis. Two algae
and 113 taxa of macrobenthic invertebrates from 12 animal phyla were identified. Species richness was one order of magnitude
higher (mean 29.0 sp st−1) in stations located outside or in the southern unprotected section of BSS than in most muddy or sandy stations within the
bay (mean 3.7 sp st−1). Hard bottom stations outside BSS were dominated by a rich assemblage of sessile filter-feeders, mainly bryozoans, hydrozoans,
ascidians, sponges, and the bivalve Aulacomya atra. Soft bottom areas inside BSS were mainly populated by relatively few species of deposit-feeders, such as the orbiniid polychaete
Phylo felix, which was particularly frequent and widespread. Shells of the clam Mulinia edulis are very common, representing one of the few hard substrata available for sessile species on soft bottoms. Epibenthic assemblages
within BSS were dominated by the detritivorous isopod Serolis paradoxa and the crab Eurypodius latreillei. The macrobenthic fauna of BSS can be regarded as typical of the Magellan region, showing affinities with those of other
localities around Tierra del Fuego, the Straits of Magellan and the southern Chilean fjords. 相似文献