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The promise and limits of DNA based approach to infer diet flexibility in endangered top predators 基于DNA的方法推断濒危顶级食肉动物饮食灵活性的前景和局限性
Pub Date : 2021-12-02 DOI: 10.24072/pci.ecology.100090
S. Arnaud-Haond
work, the authors assessed the nature and spatio-temporal flexibility of the foraging behaviour and consequent diet of the endangered petrel Procellaria westlandica from New-Zealand through metabarcoding of faeces samples. The results of this dDNA, non-invasive approach, identify some expected and also unexpected prey items, some of which require further investigation likely due to large gaps in the reference databases. They also reveal the temporal (before and after hatching) and spatial (across colonies only 1.5km apart) flexibility of the foraging behaviour, additionally suggesting a possible influence of fisheries activities in the surroundings of the colonies. This study thus both underlines the power of the non-invasive metabarcoding approach on faeces, and the important results such analysis can deliver for conservation, pointing a potential for diet flexibility that may be essential for the resilience of this iconic yet endangered species. The authors have used metabarcoding of environmental DNA from fecal samples of tāiko (Procellaria westlandica), an endangered New Zealand seabird, to better understand its foraging behavior and trophic ecology. Two seasons and two sub-colonies were compared to assess temporal and spatial variation in the potential diets of tāiko. The authors found that surprisingly, talitrid amphipods dominated both the frequency of occurrence and relative number of sequence reads in the fecal samples from tāiko. However, more consistent with expectations, fish and cephalopods were also significant components of tāikos diet – with an important commercial deep-sea species (hoki) featuring prominently, thus suggesting a potential conflict with the fishing industry due to bycatch. DNA foraging Storm-Petrels Hydrobates 8:87-94.
通过对新西兰濒危海燕粪便样本进行元条形码编码,作者评估了其觅食行为的性质和时空灵活性,以及由此产生的饮食。这种dna非侵入性方法的结果确定了一些预期的和意想不到的猎物,其中一些需要进一步调查,可能是由于参考数据库的巨大空白。它们还揭示了觅食行为的时间(孵化前后)和空间(相距仅1.5公里的种群)灵活性,此外还表明了种群周围渔业活动的可能影响。因此,这项研究既强调了粪便非侵入性元条形码方法的力量,也强调了这种分析可以为保护提供的重要结果,指出了饮食灵活性的潜力,这可能是这种标志性的濒危物种恢复能力所必需的。作者对新西兰濒危海鸟tāiko (Procellaria westlandica)粪便样本中的环境DNA进行了元条形码编码,以更好地了解其觅食行为和营养生态学。比较了两个季节和两个亚种群,以评估tāiko潜在饮食的时空变化。作者发现,令人惊讶的是,在tāiko的粪便样本中,talitrid片脚类动物的出现频率和相对序列读取数都占主导地位。然而,与预期更一致的是,鱼类和头足类动物也是tāikos饮食的重要组成部分,其中重要的商业深海物种(hoki)占突出地位,因此表明由于副渔获物与渔业存在潜在冲突。DNA觅食风暴海燕:8:87-94。
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引用次数: 0
When more competitors means less harvested resource 当更多的竞争者意味着更少的资源收获
Pub Date : 2021-11-22 DOI: 10.24072/pci.ecology.100088
F. Munoz
This paper presents a game theoretic model of a kind of contest competition for ripening resources. The author develops a simple, mathematically tractable version of the model and also exposes results of a classroom experiment and evolutionary simulations. Overall, theoretical and empirical results seem to generally agree, with the surprising result that more and more contestants “go fishing” when the number of competitors increases. The Nash equilibrium, which is evolutionarily unstable, looks like a good approximation for the evolutionary outcome, for reasons that are not totally clear yet.
本文提出了一种竞争成熟资源的博弈论模型。作者开发了一个简单的、数学上易于处理的模型,并展示了课堂实验和进化模拟的结果。总的来说,理论和实证结果似乎基本一致,令人惊讶的结果是,随着竞争对手数量的增加,越来越多的参赛者“去钓鱼”。纳什均衡,在进化上是不稳定的,看起来是进化结果的一个很好的近似,原因尚不完全清楚。
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引用次数: 0
The difficult interpretation of species co-distribution 物种共分布的困难解释
Pub Date : 2021-10-25 DOI: 10.24072/pci.ecology.100082
D. Gravel
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引用次数: 0
Doomed by your partner: when mutualistic interactions are like an evolutionary millstone around a species’ neck 被你的伴侣注定了:互惠互动就像一个物种脖子上的进化磨盘
Pub Date : 2021-10-20 DOI: 10.24072/pci.ecology.100089
S. Billiard
Mutualistic interactions are the weird uncles of population and community ecology. They are everywhere, from the microbes aiding digestion in animals’ guts to animal-pollination services in ecosystems; They increase productivity through facilitation; They fascinate us when small birds pick the teeth of a big-mouthed crocodile. Yet, mutualistic interactions are far less studied and understood than competition or predation. Possibly because we are naively convinced that there is no mystery here: isn’t it obvious that mutualistic interactions necessarily facilitate species coexistence? Since mutualistic species benefit from one another, if one species evolves, the other should just follow, isn’t that so?
互惠互动是种群和群落生态学的奇怪舅舅。它们无处不在,从帮助动物肠道消化的微生物到生态系统中的动物授粉服务;他们通过促进提高生产力;当小鸟啄一只大嘴鳄鱼的牙齿时,它们让我们着迷。然而,对互惠互动的研究和理解远远少于竞争或捕食。可能是因为我们天真地相信这里没有什么神秘之处:互惠的相互作用必然促进物种共存,这不是很明显吗?既然互惠互利的物种相互受益,如果一个物种进化了,另一个物种就应该跟着进化,不是吗?
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引用次数: 0
Does the active vocabulary in Great-tailed Grackles supports their range expansion? New study will find out 大尾石鸦的活动词汇是否支持它们的活动范围扩展?新的研究将找到答案
Pub Date : 2021-08-12 DOI: 10.24072/pci.ecology.100087
J. Engler
on the role of social information sharing leading to range expansion in with large vocal repertoires:
论社会信息共享在大人声库中对音域扩展的作用
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引用次数: 0
Towards a better understanding of the effects of self-shading on Fucus serratus populations 为了更好地了解自遮荫对黑角藻种群的影响
Pub Date : 2021-08-02 DOI: 10.24072/pci.ecology.100086
C. Hubas
The importance of the vertical structure of vegetation cover for the functioning, management and conservation of ecosystems has received particular attention from ecologists in the last decades. Canopy architecture has many implications for light extinction coefficient, temperature variation reduction, self-shading which are all key parameters for the structuring and functioning of different ecosystems such as grasslands [1,2], forests [3,4], phytoplankton communities [5, 6], macroalgal populations [7] and even underwater animal forests such as octocoral communities [8].
植被覆盖的垂直结构对生态系统的功能、管理和保护的重要性在过去几十年中受到生态学家的特别注意。冠层结构在消光系数、温度变化减少、自遮阳等方面具有许多意义,这些都是不同生态系统结构和功能的关键参数,如草地[1,2]、森林[3,4]、浮游植物群落[5,6]、大型藻类种群[7],甚至水下动物森林如八珊瑚群落[8]。
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引用次数: 0
Unity makes strength: clustered extinctions have stronger, longer-lasting effects on metacommunities dynamics 团结就是力量:集群灭绝对元群落动态有更强、更持久的影响
Pub Date : 2021-05-26 DOI: 10.24072/PCI.ECOLOGY.100084
E. Vercken
In this article, Saade et al. (2021) investigate how the rate of local extinctions and their spatial distribution affect recolonization dynamics in metacommunities. They use an elegant combination of microcosm experiments with metacommunities of freshwater ciliates and mathematical modelling mirroring their experimental system. Their main findings are (i) that local patch extinctions increase both local (α-) and inter-patch (β-) diversity in a transient way during the recolonization process, (ii) that these effects depend more on the spatial distribution of extinctions (dispersed or clustered) than on their amount, and (iii) that they may spread regionally. Microcosm experiments are already quite cool just by themselves and have contributed largely to conceptual advances in community ecology (see Fraser and Keddy 1997, or Jessup et al. 2004 for reviews on this topic), but they are here exploited to a whole further level by the fitting of a metapopulation dynamics model. The model allows both to identify the underlying mechanisms most likely to generate the patterns observed (here, competitive interactions) and to assess the robustness of these patterns when considering larger spatial or temporal scales. This release of experimental limitations allows here for the analysis of quantitative metrics of spatial structure, like the distance to the closest patch, which gives an interesting insight into the functional basis of the effect of the spatial distribution of extinctions.
在这篇文章中,Saade等人(2021)研究了局部灭绝的速度及其空间分布如何影响元群落的再定殖动态。他们巧妙地结合了淡水纤毛虫元群落的微观实验和反映实验系统的数学模型。他们的主要发现是:(1)局部斑块灭绝在再定殖过程中以一种短暂的方式增加了局部(α-)和斑块间(β-)的多样性;(2)这些影响更多地取决于灭绝的空间分布(分散或聚集),而不是它们的数量;(3)它们可能在区域内扩散。微观世界实验本身就已经很酷了,并且在很大程度上促进了群落生态学的概念进步(参见弗雷泽和凯迪1997年,或杰瑟普等人2004年关于这个主题的评论),但在这里,通过拟合元种群动力学模型,它们被进一步开发到一个整体水平。该模型既可以识别最可能产生所观察到的模式的潜在机制(这里是竞争性相互作用),也可以在考虑更大的空间或时间尺度时评估这些模式的稳健性。这种实验限制的释放允许对空间结构的定量度量进行分析,比如到最近斑块的距离,这为物种灭绝空间分布影响的功能基础提供了有趣的见解。
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引用次数: 0
A lack of clear dietary differences between ontogenetic stages of invasive slippersnails provides important insights into resource use and potential inter- and intra-specific competition 侵袭性滑蝇个体发育阶段之间缺乏明确的饮食差异,这为资源利用和潜在的种间和种内竞争提供了重要的见解
Pub Date : 2021-05-05 DOI: 10.24072/PCI.ECOLOGY.100077
M. E. Bracken
Review of “Trophic niche of the invasive gregarious species Crepidula fornicata, in relation to ontogenic changes” Androuin et al. bioRxiv, PCI Ecology This is an interesting ms investigating the trophic ecology of slipper limpets, using a complimentary biomarker approach, combining fatty acids, isotopes, and natural history. The findings are based on observational data. The writing is generally good; it may be more text in some sections than is absolutely necessary, and it may be preferable to move some text from the discussion to the introduction. The methods and interpretation of the data seem appropriate. The figures are very informative. I have a few suggestions for improving the flow and interpretation below. The Abstract clearly states that ” the trophic niche of C. fornicata does not change significantly across its benthic life” which should have been the expected result. This paper is a classic example of ‘collect a lot of data and see if it tells us anything’. It is also common sense that the FA profiles would be different between the males and females and sampling dates. Abstract: what is ‘opportunistic suspension feeding behaviour’? That is their natural feeding mode, they feed upon what is in the surrounding water column! Overall, this manuscript presents a lot of data – everything they could measure – and no much in the way of synthesis or significance. In essence, it is overkill to make a nonstatement about nonexistent trophic niche differences. There isn’t even a clear discussion of why trophic niche differences would or could make a difference to anything tangible. It is also a dangerous practice to ‘infer’ anything, least of all assimilation of organic material (line 363). Line 429 which states that … the slipper limpet is an opportunistic suspension-feeder that exploits both pelagic and benthic particulate OM… is well known and this study did not discover that fact. It should have references. FA profiles would obviously be different between males and females and would vary over time, temperature, food availability, season, and other environmental factors. The manuscript is excessively long and longwinded. There are some interesting data, but as presented it is just a catalog of results, many of them repeated in the discussion. The entire paper reads like a thesis with every possible data point included. It could and should be shortened by half (at least). It is a tedious read and actual results and their significance are difficult to identify. The many instances are ‘references of convenience’, i.e. what was at hand or cited elsewhere, not the key for the Example: Blanchard 1997 the source that Crepidula
“入侵群聚物种Crepidula fornicata的营养生态位与个体发生变化的关系”综述Androuin et al. bioRxiv, PCI Ecology这是一项有趣的研究,利用互补的生物标志物方法,结合脂肪酸、同位素和自然历史,研究拖鞋帽贝的营养生态。这些发现是基于观测数据。写作总体上还不错;在某些章节中可能会有比绝对必要的更多的文本,并且最好将一些文本从讨论部分移到介绍部分。数据的方法和解释似乎是适当的。这些数字很有信息量。下面我有一些改进流程和解释的建议。摘要明确指出,“C. fornicata的营养生态位在其整个底栖生命中不会发生显著变化”,这应该是预期的结果。这篇论文是“收集大量数据,看看它是否能告诉我们什么”的经典例子。男性和女性以及采样日期之间的FA概况也会有所不同,这也是常识。摘要:什么是“机会性悬浮摄食行为”?这是它们的自然进食方式,它们以周围水柱中的东西为食!总的来说,这份手稿提供了大量的数据——他们可以测量的所有数据——但没有太多的综合或意义。从本质上讲,对不存在的营养生态位差异不予说明是矫枉过正的。甚至没有一个明确的讨论为什么营养生态位的差异会或可能对任何有形的东西产生影响。“推断”任何事情也是一种危险的做法,尤其是有机物质的同化(第363行)。第429行,拖鞋帽贝是一种机会性的悬浮食料,利用远洋和底栖微粒OM,这是众所周知的,这项研究没有发现这个事实。它应该有参考。男性和女性的FA谱明显不同,并且会随着时间、温度、食物供应、季节和其他环境因素而变化。这份手稿太长,太啰嗦了。这里有一些有趣的数据,但正如所呈现的,它只是一个结果目录,其中许多在讨论中重复。整篇论文读起来就像一篇包含了所有可能数据点的论文。它可以而且应该缩短一半(至少)。这是一个乏味的阅读和实际的结果和他们的意义很难识别。许多例子都是“方便的参考”,即手边或其他地方引用的东西,而不是例子的关键:Blanchard 1997, Crepidula的来源
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引用次数: 0
Allee effects under the magnifying glass 放大镜下的小巷效应
Pub Date : 2021-04-22 DOI: 10.24072/PCI.ECOLOGY.100078
David Alonso
For decades, the effect of population density on individual performance has been studied by ecologists using both theoretical, observational, and experimental approaches. The generally accepted definition of the Allee effect is a positive correlation between population density and average individual fitness that occurs at low population densities, while individual fitness is typically decreased through intraspecific competition for resources at high population densities. Allee effects are very relevant in conservation biology because species at low population densities would then be subjected to much higher extinction risks.
几十年来,生态学家通过理论、观察和实验方法研究了种群密度对个体表现的影响。Allee效应被普遍接受的定义是种群密度与平均个体适应度之间的正相关关系,这种关系发生在低种群密度时,而个体适应度通常在高种群密度时通过种内资源竞争而降低。狭缝效应在保护生物学中非常重要,因为低种群密度的物种将面临更高的灭绝风险。
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引用次数: 0
A planned experiment on local adaptation in a host-parasite system: is adaptation to the host linked to its recent domestication? 有计划的宿主-寄生虫系统局部适应实验:对宿主的适应与其最近的驯化有关吗?
Pub Date : 2021-04-20 DOI: 10.24072/PCI.ECOLOGY.100079
E. Petit
A recommendation of: Olvera-Vazquez S.G., Alhmedi A., Minarro M., Shykoff J. A., Marchadier E., Rousselet A., Remoue C., Gardet R., Degrave A. , Robert P. , Chen X., Porcher J., Giraud T., Vander-Mijnsbrugge K., Raffoux X., Falque M., Alins, G., Didelot F., Belien T., Dapena E., Lemarquand A. and Cornille A. Experimental test for local adaptation of the rosy apple aphid (Dysaphis plantaginea) during its recent rapid colonization on its cultivated apple host (Malus domestica) in Europe https://forgemia.inra.fr/amandine.cornille/local_adaptation_dp
建议:Olvera-Vazquez S.G, Alhmedi A, Minarro M, Shykoff J. A, Marchadier E, Rousselet A, remoe C, Gardet R, Degrave A, Robert p, Chen X, Porcher J, Giraud T, Vander-Mijnsbrugge K, Raffoux X, Falque M, Alins, G, Didelot F, Belien T, Dapena E,Lemarquand A.和Cornille A.玫瑰色苹果蚜虫(Dysaphis plantaginea)最近在欧洲栽培苹果寄主(Malus domestica)上快速殖民期间对当地适应性的实验测试https://forgemia.inra.fr/amandine.cornille/local_adaptation_dp
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引用次数: 0
期刊
Peer Community In Ecology
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