Results 11 to 20 of about 1,059,965 (153)

鸟类鸣啭能力的性别和季节性差异

open access: yes野生动物学报, 1989
鸟类鸣啭能力存在着性别与季节性差异。研究表明,这些差异与激素水平的周期性变化有关。我们发现,雄鸟鸣啭控制核团的体积比雌鸟大。睾酮能诱导神经元数目增加,树突增长和突触形成。在这些变化中,激素与感觉刺激的协同是必要的。
李东风, 蓝书成
doaj   +2 more sources

基于高通量测序技术对不同季节圈养褐马鸡肠道菌群多样性分析

open access: yes野生动物学报, 2022
为提高褐马鸡(Crossoptilon mantchuricum)疾病防控能力和饲养管理水平,利用高通量测序技术对其肠道菌群进行多样性分析,探知其肠道菌群在不同季节的变化规律,并预测潜在致病的高发时间段,结果表明:门水平上,圈养褐马鸡的肠道优势菌群为厚壁菌门(Firmicutes,52.11%)、拟杆菌门(Bacteroidetes,18.20%)、变形菌门(Proteobacteria,17.91%)和放线菌门(Actinobacteria,7.32%); 属水平上 ...
雷 英   +11 more
doaj   +2 more sources

江西桃红岭保护区同域分布有蹄类动物活动节律差异

open access: yes野生动物学报
为探究同域分布的有蹄类动物活动节律及其季节性差异,2017年3月—2019年5月,利用红外相机技术在江西桃红岭梅花鹿国家级自然保护区对有蹄类动物开展野外监测。在15 208个相机有效工作日中,共拍摄到梅花鹿(Cervus nippon)、野猪(Sus scrofa)和小麂(Muntiacus reevesi) 3种有蹄类动物,相对丰富度依次为3.90%、9.72%和39.59%。年活动格局分析表明,梅花鹿和野猪在4月相对丰富度最高,小麂在5月和7月相对丰富度最高,三者均在12月相对丰富度最低 ...
孔凡前   +11 more
doaj   +2 more sources

贺兰山岩羊活动节律与家域特征

open access: yes野生动物学报
野生动物的活动节律和家域特征是其为适应内外环境变化而形成的生存模式,研究活动节律和家域特征有助于深入了解野生动物生态适应性,维护生态平衡,并有助于制定科学保护策略。因此,基于北斗卫星追踪项圈监测技术,深入研究了贺兰山岩羊(Pseudois nayaur)全年的活动节律和家域特征,以及不同季节、性别的个体差异。研究表明:(1)岩羊属于晨昏性动物(06:00—10:00、16:00—20:00),4个季节均表现为双峰模式的日活动节律;(2)岩羊全年的活动速率为(0.17±0.51) km/h ...
崔爽   +6 more
doaj   +2 more sources

刘公岛麋鹿非季节性脱毛的研究与分析

open access: yes野生动物学报, 2013
麋鹿具有季节性脱毛的特点,冬毛脱落的时间在3~5月,而后长出较为短而稀疏的夏毛;冬毛长出的时间在10~11月,此时夏毛脱落,长出浓密的冬毛。2012年7月该园1只成年雄性麋鹿出现非季节性的全身脱毛症状。实验室检查结果表明血液常规正常:血液临床生化分析正常;血液微量元素测定正常,血液激素测定正常,毛皮屑真菌培养正常。在没有进行治疗的情况下,1个月后动物自行痊愈。综合分析该病例的发生可能与季节变化、个体之间差异等因素有关。麋鹿非季节性脱毛相关研究尚属首次,本研究旨在为麋鹿相关研究提供参考。
张玉稳   +4 more
doaj   +2 more sources

秦岭大熊猫家域的季节、性别和年龄效应

open access: yes野生动物学报, 2006
本文通过潘文石对22只秦岭大熊猫的家域观察资料为基础,获得生态年龄段和家域对数转换值等次生数据, 并以次生数据为基础,对不同生态年龄段和不同季节大熊猫的家域和个体季节性迁移面积的动态特征进行定性比较分析,通过季节、性别和年龄对秦岭大熊猫种群家域动态的影响机制进行了探讨,结果发现以下新细节: (1)虽然在同一季节,大熊猫家域面积随着年龄的增长逐渐增加,但雌性个体家域面积增加不大,雄性个体也仅在夏季家域面积增加极大,秋冬季增加也不大; (2)同一生态年龄段,秦岭大熊猫家域面积:全年>秋冬季>夏季; (3 ...
宋成军   +4 more
doaj   +2 more sources

Groundwater mapping and locally engaged water governance in a small island terrain: Case study of Karainagar island, Northern Sri Lanka

open access: yesWorld Water Policy, Volume 9, Issue 3, Page 456-480, August 2023., 2023
Abstract Groundwater is a vital resource under threat in island communities. Karainagar, a 22 km2 island, is one of seven islands off the coast of Jaffna in Northern Sri Lanka, with its population of just about 11,000 persons, experiences seasonal water shortage, and salinity in groundwater as twin threats impacting on their lives.
Inthirakumaran Karthiga   +3 more
wiley   +1 more source

The efficacy of subcutaneous slow‐release melatonin implants in the prevention of canine flank alopecia recurrence is uncertain: A double‐blind, randomized, placebo‐controlled study

open access: yesVeterinary Dermatology, Volume 33, Issue 6, Page 553-558, December 2022., 2022
Background – Canine flank alopecia (CFA) is characterized by seasonally recurring noninflammatory, occasionally hyperpigmented alopecia predominantly in the thoracolumbar area. Previous studies suggest that reduced production of endogenous melatonin may play a role in the pathogenesis of this condition, and placebo‐controlled studies on the efficacy of
Millie U. M. Y. Verschuuren   +4 more
wiley   +1 more source

Leaf morphological traits as adaptations to multiple climate gradients

open access: yesJournal of Ecology, Volume 110, Issue 6, Page 1344-1355, June 2022., 2022
The plastic response of size, shape, colour and other leaf morphological traits to climate is muted, thus their apparent shift along climate gradients reflects plant adaptations to environment at a community level as determined by species replacement.
Han Wang   +3 more
wiley   +1 more source

Optimization of capture–recapture monitoring of elusive species illustrated with a threatened grasshopper

open access: yesConservation Biology, Volume 34, Issue 3, Page 743-753, June 2020., 2020
Abstract Information on population sizes and trends of threatened species is essential for their conservation, but obtaining reliable estimates can be challenging. We devised a method to improve the precision of estimates of population size obtained from capture–recapture studies for species with low capture and recapture probabilities and short ...
Linda Bröder   +5 more
wiley   +1 more source

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