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Ecological and Genetic Insights Into Antarctic Fairy Shrimp, Branchinecta gaini Daday, 1910 (Branchiopoda: Anostraca) Populations on King George Island, Antarctica 南极仙女虾的生态学和遗传学研究,Branchinecta gaini Daday, 1910(鳃足目:无足目)在南极乔治王岛的种群
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-11 DOI: 10.1111/fwb.70144
Stanisław Cukier, Jakub Grzesiak, Robert Józef Bialik

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引用次数: 0
Unique Genetic Diversity Patterns and Extreme Endemism in Temperate Springs: Evidence From Narrow-Range Endemic Snails 温带温泉独特的遗传多样性模式和极端地方性:来自小范围地方性蜗牛的证据
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-09 DOI: 10.1111/fwb.70149
Samantha A. Donohoo, Paul D. Johnson, Nathan V. Whelan

  1. Freshwater springs often have high rates of endemism with species displaying restricted distributions, low genetic diversity and increased risk to anthropogenic influences. Several models such as the Theory of Island Biogeography, the Stream Hierarchy Model or the Death Valley Model have been invoked to explain diversity patterns in springs, especially in arid systems. However, little information exists about whether previously developed models can predict population genetic and species-level diversity of temperate spring-obligate invertebrates. As a case study, we examined the biodiversity and genetic diversity of spring-obligate gastropods at six sites in the southeastern United States to examine gastropod diversity and test how well previously developed biogeographic models characterise an understudied and imperilled system.
  2. We examined two species of Pleuroceridae snails, Princess Elimia (Elimia bellacrenata) and Cockle Elimia (Elimia cochliaris), endemic to springs in central Alabama. We sampled specimens of both species from across their current ranges and generated genome-scale data using a 2b-RAD sequencing approach. To assess species diversity and ranges, we used maximum likelihood, species tree inference and phylogenetic network approaches. We also inferred genetic diversity, population genetic structure and historical demography of each species.
  3. Phylogenetic analyses recovered four species-level lineages, including two undescribed species. Each species was found in a single spring system, resulting in an extremely small distribution. Additionally, all four of these spring-obligate lineages had higher genetic diversity than most riverine pleurocerid species. Furthermore, demographic analyses suggested that each lineage has maintained a stable population size since the Pleistocene.
  4. Our findings indicate that diversity patterns of temperate, spring-endemic gastropods do not conform to previously developed biogeographic models. Moreover, differences among species studied here and other spring-obligate groups suggest that applying broad biogeographic models to any given spring system has the potential to obscure unique characteristics of regional spring ecosystems. Empirical data should be more widely generated for understudied spring systems, and such data should inform biodiversity assessments, conservation planning and, potentially, the development of additional biogeographic models.
淡水泉的特有率往往很高,其物种分布有限,遗传多样性低,受人为影响的风险增加。一些模型,如岛屿生物地理学理论、河流等级模型或死亡谷模型,已经被用来解释春季的多样性模式,特别是在干旱系统中。然而,以前建立的模型是否能够预测温带春季专性无脊椎动物的种群遗传和物种多样性,目前还缺乏相关信息。作为一个案例研究,我们在美国东南部的六个地点检查了春季专性腹足类动物的生物多样性和遗传多样性,以检查腹足类动物的多样性,并测试先前开发的生物地理模型如何很好地表征了一个研究不足和濒危的系统。我们研究了阿拉巴马州中部泉水特有的两种胸椎螺,公主螺(Princess Elimia bellacrenata)和蜗螺(Cockle Elimia cochliaris)。我们对这两个物种的标本进行了采样,并使用2b-RAD测序方法生成了基因组规模的数据。为了评估物种多样性和范围,我们使用了最大似然、物种树推理和系统发育网络方法。我们还推测了每个物种的遗传多样性、群体遗传结构和历史人口统计。系统发育分析恢复了四个物种水平的谱系,包括两个未描述的物种。每个物种都在一个单一的春季系统中被发现,导致分布非常小。此外,这4个春性系的遗传多样性都高于大多数河流胸膜科物种。此外,人口统计分析表明,自更新世以来,每个谱系都保持了稳定的种群规模。我们的研究结果表明,温带、春季特有的腹足类动物的多样性模式不符合以前开发的生物地理模型。此外,这里所研究的物种与其他春季特有物种之间的差异表明,将广泛的生物地理模型应用于任何给定的春季系统都有可能模糊区域春季生态系统的独特特征。应该为研究不足的春季系统更广泛地产生经验数据,这些数据应该为生物多样性评估、保护规划以及可能的其他生物地理模型的发展提供信息。
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引用次数: 0
Weak Effects From Human Impact on Composition and Trophic Structure of Fish Communities in a Tropical Lowland River System 人类活动对热带低地河流水系鱼类群落组成和营养结构的微弱影响
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-07 DOI: 10.1111/fwb.70155
Mathias B. Kjeldgaard, Nikolai Friberg, Tor E. Eriksen, Johnny Håll, Steen Wilhelm Knudsen, Benjamin Kupilas, Dean Jacobsen

  1. Myanmar is a biodiversity hotspot and holds at least 570 different freshwater fish species with a high amount of endemism. Nevertheless, freshwater systems in Myanmar are highly threatened by anthropogenic perturbation such as pollution.
  2. We examined impacts on streams from nutrient enrichment and catchment degradation on the fish community composition and trophic structure. We studied 12 stream sites, and treated these as two groups (six impacted vs. six less impacted), as well as covering a gradient in degradation. We did quantitative electrofishing, collected potential food resources, invertebrates and fish for stable isotope analysis of δ13C and δ15N, and measured a number of environmental site variables. To determine fish diversity, we extracted DNA from tissue samples of 193 specimens, thereby identifying a total of 44 different species from 20 families.
  3. The most impacted sites had higher nitrogen concentrations and lower minimum O2 saturation. Fish biomass m−2 increased with degradation as it correlated positively with total nitrogen concentration and negatively with minimum O2 saturation. Fish communities did not differ significantly between the two groups nor across the environmental gradient, except that pairwise similarities were negatively related to differences in catchment forest cover.
  4. Likewise, trophic niches of the fish did not differ significantly between the two groups nor across the environmental gradient, but fish at the more impacted sites had significantly lower minimum δ15N signal and higher δ15N range compared to the least impacted.
  5. The tropical fish assemblages studied were diverse and showed overall weak response to human impact. Likewise, there was little indication of differences in tolerance to environmental stress among taxa. Thus, in contrast to previous studies on macroinvertebrates in the same region, our results suggest that fish communities are less suitable as bio-indicators of environmental degradation and biodiversity loss in these tropical lowland streams.
缅甸是生物多样性的热点,拥有至少570种不同的淡水鱼,具有很高的地方性。然而,缅甸的淡水系统受到污染等人为干扰的严重威胁。研究了营养物富集和流域退化对河流鱼类群落组成和营养结构的影响。我们研究了12个河流站点,并将它们分为两组(6个受影响的vs. 6个受影响较小的),并覆盖了退化的梯度。我们进行了定量电钓,收集了潜在食物资源、无脊椎动物和鱼类,进行了δ13C和δ15N的稳定同位素分析,并测量了一些环境现场变量。为了确定鱼类的多样性,我们从193个标本的组织样本中提取了DNA,从而确定了20科44个不同的物种。受影响最严重的地点氮浓度较高,最低氧饱和度较低。鱼类生物量m - 2随降解而增加,与总氮浓度呈正相关,与最小氧饱和度呈负相关。鱼类群落在两组之间和不同的环境梯度之间没有显著差异,除了两两相似性与集水区森林覆盖的差异负相关。鱼类的营养生态位在两组之间和不同的环境梯度之间也没有显著差异,但受影响较大的鱼类的最小δ15N信号显著低于受影响最小的鱼类,δ15N范围显著高于受影响最小的鱼类。研究的热带鱼群落种类繁多,对人类影响的响应总体较弱。同样,不同分类群对环境胁迫的耐受性也没有差异。因此,与以往对同一地区大型无脊椎动物的研究相比,我们的研究结果表明,在这些热带低地溪流中,鱼类群落不太适合作为环境退化和生物多样性丧失的生物指标。
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引用次数: 0
Constructing Isoscapes of δ13C, δ15N and δ34S Baselines Within a River System: A Spatial Stream Network Modelling Approach 构建河流系统内δ13C、δ15N和δ34S基线的等高线:一种空间流网络模拟方法
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-07 DOI: 10.1111/fwb.70140
Selina Al-Nazzal, Aaron T. Fisk, Marisa T. ValeCruz, Reid G. Swanson, Peter B. McIntyre, Gregory R. Jacobs

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引用次数: 0
Catchment Controls on the Use of Dissolved Organic Nutrients by River Phytoplankton in the United Kingdom 英国对河流浮游植物使用溶解有机营养物的集水区管制
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-05 DOI: 10.1111/fwb.70153
E. B. Mackay, H. Feuchtmayr, S. J. Thackeray, N. Callaghan, M. Marshall, G. Rhodes, C. A. Yates, P. J. Johnes, S. C. Maberly

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引用次数: 0
Supraspecific Ecological Niche Models as a Tool for Predicting Burrowing Crayfish Habitat 超种生态位模型用于预测穴居小龙虾栖息地
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-04 DOI: 10.1111/fwb.70154
Caitlin C. Bloomer, Eric R. Larson, Christopher A. Taylor

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引用次数: 0
Effects of Spring Temperature on Seasonal Dynamics of a Freshwater Zooplankton Community 春季温度对淡水浮游动物群落季节动态的影响
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-03 DOI: 10.1111/fwb.70152
Angeline J. H. M. Bruls, Ivar Herfindal, Anders G. Finstad, Karstein Hårsaker, Bernt-Erik Sæther

  1. With climate change and rising temperatures, the timing of spring is advancing in many parts of the world. Such environmental changes may have immediate effects on species communities, but also carry-over effects into later seasons. However, little is known about the extent of such carry-over effects for communities consisting of short-lived species with multiple life cycles in a year.
  2. We used a 26-year dataset to explore the immediate and carry-over effects of spring temperature on freshwater zooplankton communities consisting of three taxonomic groups (Rotifera, Cladocera and Copepoda), sampled at three locations in a lake in central Norway. We first described the seasonal dynamics of zooplankton community abundance and species richness, as well as the ratio between abundance and species richness, using generalised additive mixed models (GAMM). Next, we used a sliding window analysis to identify the most important time during spring for which temperature affected community abundance and species richness, and the impact of this window on different parts of the seasonal curve of abundance and species richness of the community. This allowed us to explore whether spring temperature affected overall abundance and species richness, whether there were seasonal differences in the strength of the effect, how any effects varied between the three phyla, and whether they were consistent among the three localities.
  3. Cladocera and Rotifera roughly followed the expected seasonal pattern, with a peak in total abundance. Copepoda, on the other hand, showed lower abundance in the middle of the sampling season. The shape of the curve also varied between localities. Spring air temperature affected the overall abundance, species richness, and abundance: species richness ratio throughout the season. In some cases, models with an interaction between spring temperature and Julian day were the best, indicating that the effect of spring temperature varied temporally in strength and direction.
  4. Given the short life cycles of most zooplankton species present in our dataset, it is surprising that effects of spring temperature are visible throughout the summer and into early autumn. This implies that pulse disturbances may have long-lasting, multigenerational effects even in communities of short-lived species. Our study also illustrates how different zooplankton groups may vary in their response to temperature variations.
随着气候变化和气温上升,世界上许多地方的春天都提前了。这种环境变化可能会对物种群落产生直接影响,但也会对以后的季节产生携带效应。然而,对于由一年中有多个生命周期的短寿物种组成的群落,这种携带效应的程度知之甚少。我们使用了一个26年的数据集来探索春季温度对淡水浮游动物群落的直接和持续影响,这些浮游动物群落由三个分类类群(轮虫目、枝角目和桡足目)组成,样本来自挪威中部一个湖泊的三个地点。本文首先利用广义加性混合模型(GAMM)描述了浮游动物群落丰度和物种丰富度的季节动态,以及丰度与物种丰富度的比值。其次,利用滑动窗口分析方法确定了春季温度对群落丰度和物种丰富度影响最大的时段,以及该时段对群落丰度和物种丰富度季节曲线不同部分的影响。这使我们能够探索春季温度是否影响总体丰度和物种丰富度,影响强度是否存在季节性差异,三个门之间的影响如何变化,以及它们在三个地点之间是否一致。枝形纲和轮形纲大致符合预期的季节模式,总丰度达到峰值。另一方面,桡足类在采样季节中期丰度较低。曲线的形状在不同的地方也有所不同。春季气温影响了整个季节的总体丰度、物种丰富度和丰度与物种丰富度之比。在某些情况下,春季温度与儒略日相互作用的模型效果最好,说明春季温度的影响在强度和方向上存在时间上的变化。考虑到我们数据集中大多数浮游动物物种的生命周期都很短,令人惊讶的是,春季温度的影响在整个夏季和初秋都是可见的。这意味着脉冲干扰可能具有持久的、多代的影响,甚至在短命物种群落中也是如此。我们的研究还说明了不同的浮游动物群体对温度变化的反应可能会有所不同。
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引用次数: 0
Evaluating the Influence of Climatic and Hydrologic Variables on Fish Communities in Channelised Agricultural Headwater Streams in the Midwestern USA 评估气候和水文变量对美国中西部渠化农业源头溪流中鱼类群落的影响
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-03 DOI: 10.1111/fwb.70148
Darren J. Shoemaker, Peter C. Smiley, Robert B. Gillespie

  1. Channelised headwater streams are common in agricultural catchments in the Midwestern United States, Canada and Europe and serve as fish habitat despite being impacted by agriculture. The influence of climatic variables on fish communities in channelised agricultural headwater streams has not been documented.
  2. Our research objectives were to identify the relationship between fish community structure and climatic variables in channelised agricultural headwater streams in northeast Indiana and central Ohio and to determine if fish community structure is better predicted by climatic variables or stream variables. We sampled fishes, compiled climatic data and measured water temperature and several stream hydrologic variables from 10 channelised agricultural headwater streams in northeast Indiana and central Ohio for 14 years.
  3. Mixed effects modelling indicated that fish diversity and relative abundance of warmwater fishes, coolwater fishes, intermediate tolerant fishes, Cyprinidae, Percidae, invertivores and brood hiders were positively correlated (p < 0.05) with precipitation and fish abundance and the relative abundance of planktivores and guarder substrate choosers were negatively correlated (p < 0.05) with precipitation. Fish abundance and the relative abundance of invertivores, planktivores and brood hiders were positively correlated (p > 0.05) with air temperature. In general, stream variables were better predictors of fish community structure than climatic variables.
  4. Our results provide insights into the relationships of fish communities with climatic and stream variables in channelised agricultural headwater streams that can be applied to help prioritise monitoring and management strategies for these small streams.
渠化的源头溪流在美国中西部、加拿大和欧洲的农业集水区很常见,尽管受到农业的影响,但仍是鱼类的栖息地。气候变量对渠化农业水源中鱼类群落的影响还没有文献记载。我们的研究目标是确定印第安纳州东北部和俄亥俄州中部渠化农业源头溪流中鱼类群落结构与气候变量之间的关系,并确定气候变量或溪流变量是否能更好地预测鱼类群落结构。14年来,我们从印第安纳州东北部和俄亥俄州中部的10条渠化农业源头溪流中采集了鱼类样本,汇编了气候数据,测量了水温和几个溪流水文变量。混合效应模拟结果表明,温水鱼类、冷水鱼类、中间耐受鱼类、鲤科、鲈科、无脊椎动物和隐巢动物的鱼类多样性和相对丰度与降水和鱼类丰度呈显著正相关(p < 0.05),浮游动物和护底动物的相对丰度与降水呈显著负相关(p < 0.05)。鱼类丰度、无脊椎动物、浮游动物和隐匿幼虫的相对丰度与气温呈显著正相关(p > 0.05)。一般来说,河流变量比气候变量更能预测鱼类群落结构。我们的结果提供了对渠化农业源头溪流中鱼类群落与气候和溪流变量的关系的见解,可以应用于帮助优先监测和管理这些小溪的策略。
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引用次数: 0
Garden Ponds: Hidden Sources for Plant Invasions? 花园池塘:植物入侵的隐藏来源?
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-12-03 DOI: 10.1111/fwb.70145
Barbara Barta, Zsuzsanna Márton, Beáta Szabó, Csaba F. Vad, Balázs András Lukács, Zsófia Horváth

{"title":"Garden Ponds: Hidden Sources for Plant Invasions?","authors":"Barbara Barta,&nbsp;Zsuzsanna Márton,&nbsp;Beáta Szabó,&nbsp;Csaba F. Vad,&nbsp;Balázs András Lukács,&nbsp;Zsófia Horváth","doi":"10.1111/fwb.70145","DOIUrl":"https://doi.org/10.1111/fwb.70145","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 12","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145686306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Linking Spatial Stream Network and Site Occupancy Models to Predict the Distribution of Arctic Grayling in a Mountainous Watershed 链接空间流网络和场地占用模型预测山区流域北极灰鲑分布
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-11-30 DOI: 10.1111/fwb.70137
Bryce O'Connor, Joseph R. Bottoms, Marie Auger-Methé, David A. Patterson, Michael Power, J. Mark Shrimpton, Steven J. Cooke, Eduardo G. Martins

{"title":"Linking Spatial Stream Network and Site Occupancy Models to Predict the Distribution of Arctic Grayling in a Mountainous Watershed","authors":"Bryce O'Connor,&nbsp;Joseph R. Bottoms,&nbsp;Marie Auger-Methé,&nbsp;David A. Patterson,&nbsp;Michael Power,&nbsp;J. Mark Shrimpton,&nbsp;Steven J. Cooke,&nbsp;Eduardo G. Martins","doi":"10.1111/fwb.70137","DOIUrl":"https://doi.org/10.1111/fwb.70137","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 12","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70137","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145695569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Freshwater Biology
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