Results 61 to 70 of about 11,348 (173)
Conservation Biology, EarlyView.Abstract Bycatch in fisheries is one of the most serious threats to pelagic seabirds, causing major population declines. Mitigation measures can reduce bycatch substantially, but many fisheries fail to apply best practices, and seabird mortality remains high.
V. Warwick‐Evans +2 more
wiley +1 more source
野生动物学报, 1985 羚牛（Budorcas taxicolor）是我国特产动物中一种较珍贵的大型偶蹄动物。秦岭是羚牛秦岭亚种的模式产地,东起柞水、西乞凤县,分布达11县之广。数量据1980年不完全统计有1300多头,近年来由于加强了保护,种群数量有了较大的增长。佛坪自然保护区就现有头数来看远超过统计数量的2倍。关于羚牛秦岭亚种的种群数量,有关单位已做了专门调查研究。1983年我们就传说中羚牛的几个行为问题通过野外观察分析 ...
田星群
doaj
Using customs data to understand overlooked trade in non‐CITES birds between Africa and Asia
Conservation Biology, EarlyView.Abstract The international trade in live birds poses risks to animals, people, and biodiversity. To effectively mitigate these risks, decision‐makers require information on the volume, dynamics, and direction of trade. Despite Africa once being the largest exporter of birds by region, very little data exist on recent trade in live birds not listed on ...
Alisa Davies +4 more
wiley +1 more source
野生动物学报, 2008 2003～2007年,对斑海豹在渤海的繁殖区和辽东湾北部双台子河口、大连旅顺虎平岛及渤海海峡的庙岛群岛3个栖息地,分别进行了斑海豹种群数量调查,并对黄海北部韩国白翎岛斑海豹度夏栖息地进行了现场考察。调查结果表明:渤海3个栖息地斑海豹数量处于动态变化之中,空间分布格局虽未发生明显变化,但斑海豹种群数量有下降趋势。白翎岛栖息地斑海豹数量波动与渤海3个栖息地斑海豹数量密切相关。由于生态环境不断恶化,尤其近年偷猎现象增多,严重威胁着本种群的生存。为此,亟待加强对斑海豹资源的保护。
王丕烈, 韩家波, 马志强
doaj
基于粒子群算法的海洋温差能朗肯循环系统多目标优化 [PDF]
, 2019 为提高海洋温差能发电系统的综合性能,以单位换热面积发电量和单位海水流量发电量为基础建立综合目标函数,选取蒸发温度、冷凝温度、蒸发器和冷凝器的海水出口温度为优化变量,利用粒子群算法对海洋温差能朗肯循环系统进行多目标参数优化。研究结果表明,在28℃温海水和5℃冷海水条件下,循环工质为R717时,蒸发器内的最佳蒸发温度为23.10℃,温海水出口温度为23.42℃;冷凝器内的最佳冷凝温度为12.31℃,冷海水出口温度为10.80℃;在换热器的海水进出口温差超过4℃时,换热器的海水出口温度对系统性能的影响较小 ...
张浩然, 王兵振, 王锰, 赵英汝
core
Estimating the total mortality of seabirds following a marine heat wave
Conservation Biology, EarlyView.Abstract Marine heat waves detrimentally affect a range of marine species, including seabirds, and are increasing in frequency and severity. When thousands of dead seabirds wash up on beaches, the public becomes concerned. However, the number of dead birds recorded on beaches is only a fraction of the total mortality; most birds perish at sea.
Jennifer L. Lavers +3 more
wiley +1 more source
, 2013 环境史探讨人类与环境的互动。与以往的历史研究相比,这一研究既充满着机遇,又面临着更大的困难与挑战。几位资深的环境史学家均强调,环境史使历史学成为比从前更为困难的一门学问,历史学者必须尝试学习自然科学并掌握超出传统历史训练的相关知识。换言之,环境史必须采取跨领域或曰跨学科(InTErdISCIPlInAry)的研究途径。1根据研究主题不同,需要结合不同学科及其方法,有学者提出其中最重要的是生态学,它为环境史学家提供了最为巨大的帮助。2不过,如何做到两者的结合实属不易。例如“生态平衡“不仅在社会上广为流行 ...
钞晓鸿
core
Effects of mating habits of Carposina sasakii on reproduction [PDF]
[Objective] This study aimed to investigate the effects of male multiple mating and female delayed mating on the reproductive capacity of Carposina sasakii (Lepidoptera: Carposinidae), in order to provide scientific evidence for evaluating the efficacy ...
JIANG Yihao, WANG Xueli, ZHANG Jinyong
core +1 more source
Assessing differences among elasmobranch nurseries to aid conservation based on a genomics framework
Conservation Biology, EarlyView.Abstract Elasmobranch nurseries often differ in environmental conditions, demographics, and use patterns. These differences affect the distribution of genetic variation among nurseries. However, conservation and management strategies often fail to account for such differences because they are difficult to characterize.
Dominic G. Swift +8 more
wiley +1 more source
Jellyfish blooms restructure plankton dynamics and trophic linkages in coastal waters
Functional Ecology, Volume 40, Issue 5, Page 1443-1460, May 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Jellyfish blooms are increasing globally in frequency and intensity, introducing complex ecological interactions, yet the mechanisms by which they alter ecosystem structure remain poorly characterized due to a lack of sustained field observations.
Pengpeng Wang +4 more
wiley +1 more source