全文获取类型
收费全文 | 518篇 |
免费 | 10篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 20篇 |
环保管理 | 65篇 |
综合类 | 72篇 |
基础理论 | 123篇 |
环境理论 | 1篇 |
污染及防治 | 177篇 |
评价与监测 | 41篇 |
社会与环境 | 20篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 6篇 |
2022年 | 11篇 |
2021年 | 19篇 |
2020年 | 13篇 |
2019年 | 11篇 |
2018年 | 15篇 |
2017年 | 24篇 |
2016年 | 35篇 |
2015年 | 27篇 |
2014年 | 27篇 |
2013年 | 55篇 |
2012年 | 31篇 |
2011年 | 48篇 |
2010年 | 36篇 |
2009年 | 22篇 |
2008年 | 31篇 |
2007年 | 23篇 |
2006年 | 18篇 |
2005年 | 13篇 |
2004年 | 11篇 |
2003年 | 8篇 |
2002年 | 15篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有536条查询结果,搜索用时 15 毫秒
121.
122.
J.?MartínEmail author P.?López W.?E.?CooperJr. 《Behavioral ecology and sociobiology》2003,54(5):505-510
Because time spent in refuge may be costly if prey lose opportunities to forage, fight, or mate, prey allow predators to approach closer before beginning to flee when opportunity costs are high. Because the same opportunity costs may apply to refuge use as to escape, prey should make similar trade-offs between risk of emerging and cost of remaining in refuge. In the Iberian rock lizard, Lacerta monticola, we studied the effects of sex, reproductive season, speed of predator approach, and potential loss of mating opportunities on time spent in refuge following simulated predatory attacks. Lizards of both sexes adjusted refuge use to the level of risk by spending more time in refuge when approached rapidly than slowly. Females remained in refuge for equal times in the mating and postreproductive seasons, but males emerged sooner during the mating season, suggesting adjustment to a cost of lost opportunity to search for mates during the mating season. When a tethered female was nearby, males emerged from refuge earlier than if no female was present, indicating a trade-off between risk and mating opportunity. Approach speed affected emergence time when females were absent, but not when a female was present. Approach speed did not affect the probability that, after emerging, a male would return to court the female. For males that courted females intensely (bit them) before entering refuge, approach speed did not affect latency to emerge, but males that courted less intensely emerged sooner if approached slowly than rapidly. These findings show that males adjust the length of time spent in refuge to both risk of predation and reproductive cost of refuge use.Communicated by A. Mathis 相似文献
123.
Benavides-Lopez Jose Luis ter Hofstede Hannah Robillard Tony 《Die Naturwissenschaften》2020,107(1):1-11
The Science of Nature - The capability of producing sounds and vibrations is well known in insects and is thought to be a form of intra- and interspecific communication. Sounds and vibrations are... 相似文献
124.
125.
126.
Aravindakshan Sreejith Krupnik Timothy J. Shahrin Sumona Tittonell Pablo Siddique Kadambot H. M. Ditzler Lenora Groot Jeroen C. J. 《Environment, Development and Sustainability》2021,23(11):16588-16616
Environment, Development and Sustainability - Appreciating and dealing with the plurality of farmers’ perceptions and their contextual knowledge and perspectives of the functioning and... 相似文献
127.
Carolina Briones Pablo Presa Montse Pérez Alfonso Pita Ricardo Guiñez 《Marine Biology》2013,160(12):3143-3156
Connectivity in benthic marine animals with complex life cycles occurs primarily during the pelagic larval stage and depends deterministically on oceanographic dynamics. The scale of such larval dispersal is highly uncertain due the difficulty of direct measurement and poor knowledge of larval dynamics and ocean flow variability. This study characterizes the pattern of genetic connectivity in the ecosystem engineer Perumytilus purpuratus between latitudes 23°S and 33°S, which includes the ecological discontinuity reported for many taxa north to 32°S at the southeast Pacific. The genetic discontinuity observed in P. purpuratus around 26°S is described herein while that detected at 28°S is in line with the ecological discontinuity (in coverage, recruitment and density) previously reported for this mussel between 28°S and 32°S. Both discontinuities delimitate two major gene pools upon Bayesian inferences on geographical variation of five microsatellite loci. Interestingly, marker Pepu1 was responsible for most variation between pools and was potentially under selection. In fact, inferences excluding Pepu1 produced a single gene pool (k = 1) in central-northern Chile. The IBD connectivity pattern observed among P. purpuratus beds distributed in the interval 23°S–33°S is congruent with processes driven by larval dynamics, and the dominant equatorward Humboldt Current along a coast largely unaffected by ice during the last Pleistocene glaciation. However, the selective scenario unveiled by microsatellite Pepu1 inside the 25°S–28°S ecological discontinuity is consistent with selective processes associated with specific mesoscale properties operating in this area. This study highlights the usefulness of integrating different oceanographic scales, ecological data and population genetics to better understand connectivity of benthic marine species. 相似文献
128.
129.
130.