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The Role of Fish in Nutrient Recycling Across a Conservation Gradient in Neotropical Streams 鱼类在新热带河流保护梯度中养分循环中的作用
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-16 DOI: 10.1111/fwb.70113
Ronny José de Morais, Gaston E. Small, Samantha Salomão Caramori, Fabrício Barreto Teresa

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引用次数: 0
Where Do You Fly From? Assessing Aerial Dispersal in Temporary Rivers Using Stable Isotopes 你从哪里飞来?利用稳定同位素评估临时河流中的空中扩散
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-15 DOI: 10.1111/fwb.70108
José María Fernández-Calero, Daniel von Schiller, Guillermo Quevedo-Ortiz, Anna Ticó Pifarré, Núria Cid, Miguel Cañedo-Argüelles, Núria Bonada

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引用次数: 0
Regulatory Mechanisms of Microcystis in Response to Stress Following Gradual Transitions to Cold Temperatures 微囊藻在逐渐过渡到低温后对应激的调节机制
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-14 DOI: 10.1111/fwb.70107
Yuting Deng, Lu Zhao, Teng Zhao, Ling Zhou, Jinna Wang, Peichang Dong, Baohai Zheng, Junqiong Shi, Zhongxing Wu

  1. Overwintering cells play a crucial role in Microcystis blooms; however, the mechanisms underlying this process are not yet fully understood. In this study, we investigated the response mechanism of Microcystis aeruginosa to a gradual temperature decline (GTD) by simulating temperature shifts from autumn to winter.
  2. Here, the difference of the growth, cell viability, chlorophyll fluorescence, and oxidative stress between GTD group and direct low-temperature treatment (DLT) group were compared. We also determined the trade-offs between defensive and active strategies for coping with GTD treatment by conducting metabolomics and transcriptomic analysis.
  3. Our findings revealed that the growth of M. aeruginosa cells subjected to gradual temperature decline decreased significantly; however, they were able to recover rapidly once normal conditions were restored. Following the gradual decrease in temperature, several genes associated with photosynthesis, carbohydrate metabolism, oxidative phosphorylation and peptidoglycan biosynthesis in M. aeruginosa were downregulated. In contrast, genes involved in microcystin production—specifically, mcyB-G, mcyI and mcyJ—and those related to the methionine salvage pathway were upregulated compared with those in cells subjected to direct low-temperature treatment (DLT). Significant enrichment of metabolites such as L-proline, γ-aminobutyric acid (GABA), maltitol, nerol and panose was observed in the GTD group compared with the DLT group.
  4. This study integrated physiological, metabolite and transcriptomic data to characterise cold-induced changes in M. aeruginosa. Our findings demonstrate that the energy requirements of M. aeruginosa cells can be reduced by downregulating energy and carbohydrate metabolism. Additionally, M. aeruginosa cells can regulate metabolites, including microcystin and the methionine salvage pathway, to survive cold stress. These results vividly underscore the remarkable physiological plasticity of M. aeruginosa in adapting to incremental environmental alterations. This adaptability not only provides valuable insights into the survival mechanisms of this species but also has significant implications for understanding the ecological dynamics of cyanobacterial blooms in changing environments, providing new insights into the mechanisms underlying seasonal cyanobacterial blooms and the pivotal roles of signalling and microcystin regulation.
越冬细胞在微囊藻华中起关键作用;然而,这一过程背后的机制尚不完全清楚。本研究通过模拟秋冬气温变化,探讨了铜绿微囊藻(Microcystis aeruginosa)对温度逐渐下降(GTD)的响应机制。比较GTD组和直接低温处理(DLT)组在生长、细胞活力、叶绿素荧光和氧化应激方面的差异。我们还通过代谢组学和转录组学分析确定了应对GTD治疗的防御和主动策略之间的权衡。结果表明,温度逐渐下降后,M. aeruginosa细胞的生长明显下降;然而,一旦恢复正常条件,他们能够迅速恢复。随着温度的逐渐降低,铜绿假单胞菌中与光合作用、碳水化合物代谢、氧化磷酸化和肽聚糖生物合成相关的几个基因被下调。相比之下,与直接低温处理(DLT)的细胞相比,参与微囊藻毒素产生的基因(特别是mcyB-G、mcyI和mcyj)以及与蛋氨酸回收途径相关的基因表达上调。与DLT组相比,GTD组代谢产物如l -脯氨酸、γ-氨基丁酸(GABA)、麦芽糖醇、薄荷醇和葡萄糖显著富集。该研究综合了生理、代谢物和转录组学数据来表征冷诱导的铜绿假单胞菌的变化。我们的研究结果表明,M. aeruginosa细胞的能量需求可以通过下调能量和碳水化合物代谢来降低。此外,M. aeruginosa细胞可以调节代谢产物,包括微囊藻毒素和蛋氨酸回收途径,以在寒冷胁迫下生存。这些结果生动地强调了绿脓杆菌在适应环境变化方面的显著生理可塑性。这种适应性不仅为了解该物种的生存机制提供了有价值的见解,而且对了解变化环境中蓝藻华的生态动力学具有重要意义,为了解季节性蓝藻华的机制以及信号和微囊藻毒素调节的关键作用提供了新的见解。
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引用次数: 0
Signals in Flux: Investigating the Seasonal Turnover of the Diel Vertical Migration-Inducing Kairomone 5α-Cyprinol Sulfate 通量中的信号:研究Diel垂直迁移诱导的Kairomone 5α-Cyprinol Sulfate的季节性周转
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-14 DOI: 10.1111/fwb.70109
Johanna Ahlers, Eric von Elert

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引用次数: 0
Dissecting Trends in the Latitudinal Diversity Gradient of Benthic Macroinvertebrates in Freshwater Lakes Across Scales 淡水湖底栖大型无脊椎动物跨尺度纬度多样性梯度的解剖趋势
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-09 DOI: 10.1111/fwb.70106
Hu He, You Zhang, Yan Li, Kai Peng, Robert P. Rutter, Jussi Jyväsjärvi, Heikki Hämäläinen, Chrysoula Ntislidou, Jianjun Wang, Min Zhang, Kuanyi Li, Zhengwen Liu, Liselotte S. Johansson, Martin Søndergaard, Yongjiu Cai, Haijun Wang, Erik Jeppesen, Jonathan M. Chase

  1. The latitudinal diversity gradient is one of the most striking biogeographical patterns on Earth and typically reveals increases in species richness from the poles towards the tropics. However, the latitudinal diversity patterns vary among taxa, ecosystems and scales. In freshwater, the patterns are particularly obscure, partially owing to limited geographical and taxonomical scope, as well as unclear controls of sampling effort.
  2. Here, we compiled data from a diverse group of benthic macroinvertebrates derived from standardised offshore surveys of 485 shallow freshwater lakes spread across the northern hemisphere to elucidate how diversity patterns at multiple spatial scales vary with latitude. At each scale, we calculated multiple effort-controlled measures emphasising different aspects of biodiversity.
  3. Contrary to our expectations, we found no evidence of a latitudinal gradient for any metric of diversity at small (local, α-) or large (regional, γ-) scales, nor any pattern of β-diversity among the lakes.
  4. Our results therefore provide some of the broadest evidence to date of a lack of latitudinal diversity gradient in offshore benthic macroinvertebrates in freshwater shallow lakes. Understanding this null relationship, and its contrast with many terrestrial and marine patterns, will require a concerted effort towards data compilation and comparative analyses.
纬度多样性梯度是地球上最引人注目的生物地理格局之一,它通常揭示了从两极到热带地区物种丰富度的增加。然而,在不同的分类群、不同的生态系统和不同的尺度上,纬度多样性格局存在差异。在淡水中,模式特别模糊,部分原因是地理和分类学范围有限,以及取样工作的控制不明确。在这里,我们收集了来自北半球485个浅水湖泊标准化近海调查的各种底栖大型无脊椎动物的数据,以阐明在多个空间尺度上的多样性模式如何随纬度变化。在每个尺度上,我们计算了强调生物多样性不同方面的多重努力控制措施。与我们的预期相反,我们没有发现在小尺度(局部尺度,α-)或大尺度(区域尺度,γ-)上任何多样性指标的纬度梯度的证据,也没有发现湖泊之间β-多样性的任何模式。因此,我们的研究结果提供了迄今为止最广泛的证据,证明淡水浅湖中近海底栖大型无脊椎动物缺乏纬度多样性梯度。要了解这种零关系及其与许多陆地和海洋模式的对比,就需要共同努力进行数据汇编和比较分析。
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引用次数: 0
Intraguild Predation Is Insufficiently Mitigated by Complex-Structured Aquatic Vegetation 结构复杂的水生植被不足以减轻野生动物的捕食
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-06 DOI: 10.1111/fwb.70104
Yaling Su, Hu He, Kuanyi Li, Zhengwen Liu, Erik Jeppesen

  1. Intraguild predation (IGP) occurs when one predator species consumes another species with whom it also competes for shared prey. IGP is widely believed to reduce prey suppression. In terrestrial ecosystems, structurally complex habitats may lessen IGP by offering refuge to intermediate predators. However, whether submerged macrophytes in shallow lakes could mitigate such antagonistic interactions remains largely unexplored. We examined the interactive impact of two aquatic predators, fish (Pelteobagrus fulvidraco, intraguild predator) and shrimp (Exopalaemon modestus, intraguild prey), on the biomass and assimilation of zooplankton prey in vegetation-sparse and vegetation-dense habitats in outdoor mesocosms.
  2. Relative to the shrimp-alone treatment, the presence of both predators resulted in a higher average zooplankton biomass in both simple and complex vegetation habitats. This suggests that IGP between the two predator species alleviated predation pressure on the zooplankton community when compared to the shrimp-alone mesocosms. However, no significant predator-macrophyte interactions were detected, suggesting that the strength of IGP was not significantly affected by habitat vegetation complexity.
  3. Evidence from zooplankton dietary markers (fatty acids) and associated carbon stable isotopes further substantiated that vegetation complexity did not significantly affect the assimilation of zooplankton by predators. Additionally, vegetation complexity had no significant effect on chlorophyll a concentrations.
  4. The results demonstrate that the strength of IGP was not substantially influenced by habitat vegetation complexity. Our findings have implications for food webs and predator–prey dynamics within aquatic systems. Thus, when implementing biomanipulation efforts aimed at combating eutrophication by enhancing herbivory on phytoplankton and promoting the resurgence of submerged macrophytes, both the quantity and diversity of predator assemblages, as well as the scale effects of submerged macrophytes, should be considered.
内部捕食(IGP)发生在一个捕食者物种吃掉另一个与之竞争共享猎物的物种时。IGP被广泛认为可以减少猎物的抑制。在陆地生态系统中,结构复杂的栖息地可以通过为中间捕食者提供避难所来降低IGP。然而,浅湖淹没的大型植物是否可以减轻这种拮抗相互作用仍未被探索。本文研究了两种水生捕食者——鱼(Pelteobagrus fulvidraco,内源捕食者)和虾(Exopalaemon modestus,内源捕食者)对室外中生态系统植被稀疏和植被密集生境中浮游动物猎物生物量和同化的交互影响。在简单和复杂植被生境中,两种捕食者的存在均使浮游动物的平均生物量高于单独捕食虾的处理。这表明,与单独捕食虾的中生态系统相比,两种捕食者之间的IGP减轻了浮游动物群落的捕食压力。但未发现捕食者与大型植物的相互作用,表明IGP强度不受生境植被复杂性的显著影响。来自浮游动物膳食标记(脂肪酸)和相关碳稳定同位素的证据进一步证实,植被复杂性对捕食者同化浮游动物没有显著影响。植被复杂性对叶绿素a浓度无显著影响。结果表明,生境植被复杂性对IGP强度影响不大。我们的发现对水生系统中的食物网和捕食者-猎物动态具有启示意义。因此,在实施旨在通过加强对浮游植物的食草性和促进水下大型植物的复苏来对抗富营养化的生物操纵措施时,应考虑捕食者组合的数量和多样性以及水下大型植物的规模效应。
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引用次数: 0
Upstream Deforestation and Nonnative Crops Affect Leaf Breakdown and Aquatic Invertebrate Assemblages in Streams 上游森林砍伐和外来作物影响溪流中叶片破碎和水生无脊椎动物群落
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-10-03 DOI: 10.1111/fwb.70102
Marcos A. Ferraz, Renan S. Rezende, Paula M. de Omena, Larissa C. Costa, Rebecca Oester, Andreas Bruder, Marcelo S. Moretti

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引用次数: 0
Sexual Reproduction in the Rotifer Asplanchna brightwellii from a Temporary Habitat: Tests for Transgenerational and Population-Density Effects 临时生境中黄斑轮虫的有性繁殖:跨代和种群密度效应的检验
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-09-28 DOI: 10.1111/fwb.70099
John J. Gilbert, Jessica V. Trout-Haney

  1. This study examines endogenous and environmental factors that might affect the timing and propensity for sex in a population of the rotifer Asplanchna brightwellii living in a Chihuahuan Desert habitat with hydroperiods of about 2–3 weeks. Multiple clones were initiated from stem females hatched from resting eggs in the sediment and cultured on Cryptomonas erosa, an alga containing tocopherol (vitamin E) required for induction of mictic females and hence production of males and fertilised resting eggs. Two hypotheses regarding the commitment of A. brightwellii to sexual reproduction were considered. First, does its propensity for sex differ in early and late parthenogenetic generations after stem females hatch? Second, is its propensity for sex affected by its population density?
  2. Experiments testing eight clones over 10 successive generations from the stem female showed no significant effect of generation on propensity for mictic-female production. Percentages of mictic females in small populations initiated by juvenile females from each generation generally were low (grand mean of 9%).
  3. Experiments with five clones showed that the propensity for mictic-female production was density independent. Percentages of mictic daughters produced by single amictic females cultured from birth in 70 mL or 2 mL did not differ significantly and generally were low (0%–18%).
  4. The persistent and low propensity for sexual reproduction in laboratory populations of these A. brightwellii clones suggests a low, fixed propensity for sex whenever the diet contains tocopherol and allows induction of mictic females. Such a life cycle strategy appears suitable for an ephemeral habitat, where the duration of hydroperiods and growing seasons is very short and unpredictable. It assures the production of some resting eggs soon after population development without greatly limiting the potential for rapid population growth via female parthenogenesis. Clones with a relatively high propensity for sex may have an advantage during shorter growing seasons, and vice versa.
本研究探讨了可能影响奇瓦瓦沙漠水周期约为2-3周的Asplanchna brigh12lii轮虫种群性行为时间和倾向的内源性和环境因素。从沉积物中的休眠卵孵出的雌性茎开始,并在隐单胞菌(Cryptomonas erosa)上培养,这是一种含有生育酚(维生素E)的藻类,用于诱导单核细胞雌性,从而产生雄性和受精的休眠卵。关于白桦属植物有性生殖的承诺,考虑了两种假设。首先,在雄性雌性孵化后的早期和晚期孤雌生殖世代中,它的性倾向是否有所不同?第二,它的性倾向是否受到人口密度的影响?从茎雌连续10代对8个无性系进行的试验表明,世代对单雌生产倾向没有显著影响。在每代幼雌发起的小种群中,mictic雌的百分比一般较低(大平均值为9%)。对5个无性系的试验表明,单株繁殖倾向与密度无关。从出生开始,在70 mL或2 mL培养基中培养的单株无亲合力雌性产生的无亲合力子代的百分比没有显著差异,通常较低(0%-18%)。在实验室种群中,这些a . brightwellii无性系持续而低的有性繁殖倾向表明,只要饮食中含有生育酚并允许诱导单核细胞雌性,就会有低的、固定的性倾向。这种生命周期策略似乎适合于短暂的栖息地,在那里,水期和生长季节的持续时间非常短且不可预测。它保证在种群发育后不久产生一些休眠卵,而不会大大限制通过雌性孤雌生殖实现种群快速增长的潜力。有性倾向相对较高的克隆在较短的生长季节可能具有优势,反之亦然。
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引用次数: 0
Issue Information - Cover and Ed Board 发行资料-封面及编印板
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-09-28 DOI: 10.1111/fwb.14282
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引用次数: 0
The Size Structure of the Zooplankton Community Reflects Better the Trophic Status of Mediterranean Ponds Than the Taxonomic Structure 浮游动物群落的大小结构比分类结构更能反映地中海池塘的营养状况
IF 2.7 2区 生物学 Q2 ECOLOGY Pub Date : 2025-09-24 DOI: 10.1111/fwb.70101
Katterine Rincón-Palau, Anna Badosa, Maria Cuenca-Cambronero, Carolina Trochine, Serena Sgarzi, Xavier D. Quintana, Dani Boix, Sandra Brucet

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引用次数: 0
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Freshwater Biology
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