Results 11 to 20 of about 30,809 (220)
Extent of threats to marine fish from the online aquarium trade in the United States. [PDF]
Conserv BiolThe global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Lin B +6 more
europepmc +2 more sources
Fluctuating salinity during development impacts fish life histories. [PDF]
J Anim EcolGlobal freshwater ecosystems are increasingly threatened by salinisation. Salinity levels not only rise but also fluctuate due to extreme climate events and human activities. This study shows that stable elevated salinity accelerates reproduction in a freshwater fish, but fluctuations in salinity reduce reproductive output, with sex‐specific effects on
Chung MJ +4 more
europepmc +2 more sources
Spatial segregation and bycatch risk as potential drivers of population trends of wandering albatrosses at South Georgia. [PDF]
Conserv BiolAbstract Spatial segregation in at‐sea distribution is frequently observed in seabirds and can have important implications for conservation and management. Globally, many albatross and petrel populations are declining due to bycatch in fisheries. In South Georgia, the decrease in wandering albatrosses (Diomedea exulans) differs among breeding sites ...
Warwick-Evans V +3 more
europepmc +2 more sources
ヒトはなぜヒトになったか？：共同作業と文化,言語(2011年,第52回日本心身医学会総会ならびに学術講演会(横浜)) [PDF]
, 2012 ヒトに最も近縁な生物はチンパンジーである.ヒトとチンパンジーはおよそ600万年前に分岐した.その後,チンパンジーは熱帯林の生活にとどまっているが,ヒトは世界中に拡散し,高度な文明を築いている.それは,ヒトが文化をもち,それを継承,発展させることができるからだ.では,このような文化をもつための生物学的な基盤は何だろう?それは,他者の心を推測する「心の理論」の機能,さらに,その根底にある,三項表象の理解である.個人が何かを考えるだけではなく,互いに他者の心を推測し ...
Mariko HASEGAWA, 長谷川 眞理子
core +2 more sources
野生动物学报, 2022 以上海动物园繁殖场笼养的5个繁殖对斑嘴环企鹅(Spheniscus demersus)为对象,采用焦点动物取样法和瞬时扫描法对其繁殖行为进行观察。结果表明:斑嘴环企鹅繁殖期亲和、警戒、护巢、打斗和修饰行为表现明显,与非繁殖期差异极显著 ...
王晶晶
doaj
野生动物学报, 2021 2015—2020年，以福州动物园33只古巴火烈鸟（Phoenicopterus ruber）为研究对象，通过日常饲养管理总结繁殖经验，并结合监控视频，采用随机观察、目标跟踪法对古巴火烈鸟的繁殖行为、繁殖年龄、繁殖季节、配对模式、发情与交配、筑巢、产卵与孵化、出壳与育雏等方面进行观察研究。结果表明：古巴火烈鸟4—6岁开始产卵繁殖，配对模式属一夫一妻制，偶有3鸟繁殖组和4鸟繁殖组；在福州地区，降水量大和气候温暖的2—4月开始发情交配，3—7月产卵，产卵高峰在6月，每窝1枚卵，每年产1—3枚，孵化期为28 ...
高喜凤
doaj
豚の多産性の育種についてII. : 山形県庄内地方のおける繁殖母豚の産子数の遺伝率 [PDF]
, 1989 論文(Article)【緒言】家畜の生産性を高めるには，発育能力と繁殖能力の二つの能力の向上が必要とされるが，豚の繁殖能力の遺伝的改良については，生産性向上の重要な柱であるにもかかわらず遺伝的変更が小さいためこれまでは選抜による改良の対照とされないできた.現在までのところ，繁殖能力については，雑種母豚を利用し，ヘテローシス効果を期待するにとどまっている.近年，豚の繁殖能力の改良が，世界的にもわが国でも問題とされてきている.その方法として，一つは ...
7652 +5 more
core +1 more source
Wildlife Letters, EarlyView.In this study we analyze the role of phylogeny, environment, and community structure on sociality. Using structural equation modeling (SEM) we aim to quantify the direct and indirect impacts of variables on behaviors including social grouping, reproduction, and space use among Carnivora species.
Jessica Ward +3 more
wiley +1 more source
Studies on the role of PGE2 in the reproduction of Small Abalone，Haliotis diversicolor [PDF]
, 2016 杂色鲍（Haliotisdiversicolor），又称九孔鲍，是我国福建南部和广东等沿海地区鲍养殖的重要品种，商业价值较高，杂色鲍繁殖调控对于其人工育苗和育种都有重要意义，但目前有关鲍的繁殖分子机制研究却十分有限，尤其是对鲍的产卵和排精机制了解更少。本文通过组织学、分子生物学和生物化学方法对杂色鲍的前列腺素E2（PGE2）、PGE2合成相关的三种酶基因和EP4受体进行了研究，并结合生态实验讨论了PGE2在杂色鲍繁殖中的作用。主要结果如下： 1.PGE2在杂色鲍繁殖中功能研究 ...
李玲玲
core
When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
wiley +1 more source