检索结果-南通市图书馆

Sex and habitat differences in size and coloration of an amphibian’s poison glands match differential predator pressures

引用

Integrative Zoology 2022年第5期17卷 764-776页

作者： Francisco Javier ZAMORA-CAMACHO Department of Phisical Chemical and Natural SystemsPablo de Olavide UniversitySevilleSpain Department of Biodiversity Ecology and EvolutionComplutense University of MadridMadridSpain

Chemical defenses are frequently accompanied by salient color patterns actively avoided by predators,a phe-nomenon referred to as aposematism.However,the production of both chemical defenses and pigments is costly,and is thus expected to be reduced under mild predator pressure.In this work,I compared the size and coloration of parotoid glands(2 dorsal,external swollen structures that secrete toxins in toads)of male and female Epidalea calamita toads from agrosystems and from pine groves.I also quantiﬁed the predator attacks received by plas-ticine toad models,whose“parotoid glands”differed in size and color conspicuousness,exposed in each habitat.Predators avoided models with large and conspicuous parotoid glands,but models in agrosystems were more of-ten attacked.Concerning actual toads,agrosystem and male individuals had larger parotoid glands,presumably implying greater production of chemical defenses than in pine grove and female conspeciﬁcs.Theseﬁndings are aligned with previous research suggesting that both agrosystem toads and males in this system are subjected to a more intense predator pressure.Difference between parotoid gland and dorsum coloration was greater in agrosys-tem toads.A marked internal pattern could function as an aposematic signal,which could counteract increased predator pressure.

关键词： anuran agrosystem aposematism Epidalea calamita plasticine model

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Combining spawn egg counts,individual photo-ID and genetic fingerprinting to estimate the population size and sex ratio of an endangered amphibian

引用

Integrative Zoology 2021年第2期16卷 240-254页

作者： Marina REYNE Sarah HELYAR Aurélie AUBRY Mark EMMERSON Ferdia MARNELL Neil REID School of Biological Sciences Queen’s University BelfastBelfastUK Institute of Global Food Security(IGFS) Queen’s University BelfastBelfastUK Agri-Food&Biosciences Institute(AFBI) HillsboroughUK National Parks&Wildlife Service(NPWS) DublinIreland

According to the International Union for Conservation of Nature Red List,41%of the world’s amphibian species are threatened with extinction,making them more threatened than any other vertebrate group nowadays.Given the global amphibian crisis,comprehensive understanding of demographics and population trends of declining and threatened species is essential for effective management and conservation strategies.Counting egg spawns is widely used to assess population abundance in pond breeding anurans.However,it is unknown how such counts translate into robust population size estimations.We monitored the breeding activity of the Natterjack toad(Epidalea calamita),combining egg string counts and individual photo-identification with Capture-Mark-Recapture population size and operational sex ratio estimation.Male Natterjack toads were identified by the pattern of natural markings with repeated ID of the same individual confirmed for 10%of the samples using genetic fingerprinting.We identified 647 unique individuals within a closed study population at Caherdaniel,Co Kerry.Population estimates derived from egg string counts estimated a breeding population of 368 females(95%CI 353–384)and Capture-Mark-Recapture estimated a breeding population of 1698 males(95%CI 1000–2397).The female:male sex ratio was conservatively estimated at 1:5(95%CI 1:3–1:6)where 62%±6%of females were assumed to spawn.These substantially departed from any priori assumption of 1:1 which could have underestimated the breeding population by up to 72%.Where amphibian absolute population size estimation is necessary,methods should include empirical survey data on operational sex ratios and not rely on assumptions or those derived from the literature which may be highly population and/or context-dependent.

关键词： Epidalea calamita genetic fingerprinting Mark-Recapture Natterjack toad photo-identification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：