Limnology and Oceanography Letters最新文献

{"title":"Grazer-induced changes on mechanical properties of diatoms frustule: A new proof for a watery arms race","authors":"Huo Xu,&nbsp;Fengyuan Chen,&nbsp;Xiaodong Zhang,&nbsp;Zhen Zhang,&nbsp;Ke Pan,&nbsp;Hongbin Liu","doi":"10.1002/lol2.10419","DOIUrl":"10.1002/lol2.10419","url":null,"abstract":"<p>We investigated changes in physiology and mechanical properties of diatoms exposed to chemical cues released by copepods <i>Pseudodiaptomus annandalei</i>. Our results showed that the diatoms <i>Phaeodactylum tricornutum</i>, <i>Cylindrotheca closterium</i>, <i>Thalassiosira weissflogii</i>, and <i>Amphora coffeaeformis</i> exhibited elevated growth rates and a substantial 2- to 50-fold increase in biogenic silica (BSi) content increase when exposed to the chemical cues except for <i>Cyclotella</i> sp. Atomic force microscopy and X-ray photoelectron spectroscopy analyses revealed that diatom frustules exhibited a remarkable 3- to 10-fold increase in modulus and a substantial 2- to 5-fold increase in hardness when they received grazing signals. The increase in the proportion of condensed silicon in the frustules could be the major reason for the more mechanically robust cells. Our results indicate that diatoms simultaneously increase their growth rate and robustness when exposed to copepod chemical cues. This study at the nanoscale enhanced our understanding of how diatoms respond to zooplankton predation in marine ecosystems.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 6","pages":"754-763"},"PeriodicalIF":5.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10419","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141489173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Consistency in marine heatwave experiments for ecological relevance and application: Key problems and solutions","authors":"Deevesh A. Hemraj,&nbsp;Bayden D. Russell","doi":"10.1002/lol2.10418","DOIUrl":"10.1002/lol2.10418","url":null,"abstract":"&lt;p&gt;Extreme events attributed to climate change are increasingly being recognized for their potentially devastating effects on species and ecosystems (Harris et al. &lt;span&gt;2018&lt;/span&gt;). The occurrence and intensities of marine heatwaves (MHWs) are increasing and so will their impact on marine ecosystems (Holbrook et al. &lt;span&gt;2020&lt;/span&gt;). Determining their ecological impact on coastal and pelagic ecosystems remains a major component of climate change research (Harvey et al. &lt;span&gt;2022&lt;/span&gt;; Hemraj et al. &lt;span&gt;2023&lt;/span&gt;), and, therefore, the number of studies examining the impact of MHWs on species, biodiversity, and ecosystem processes is increasing yearly (Fig. 1a,b). Among these studies are purely experimental work that aims to determine the impact of different intensities or frequencies of MHWs on an organism's genetics, physiology, behavior, or community interactions. Such experimental work remains fundamental to increasing our understanding of specific effects of MHWs that either cannot be measured in situ or are integral in estimating possible future impacts of MHWs on organisms. Given the large inference often based on these studies, it is essential that they follow a consistent experimental protocol that is representative of MHWs dynamics within different geographical regions and thus provide ecologically relevant information within the regional context. Nonetheless, there are lingering inconsistencies among experimental designs that make it difficult to compare the ecological outcomes of experimental studies and, in the worst cases, some are not representative of MHWs at all. Among these inconsistencies are issues with (1) the duration of the experimental study, (2) the choice of baseline temperature (control) to which MHW impacts are compared, and (3) the choice of intensity treatments.&lt;/p&gt;&lt;p&gt;The generally accepted definition of a MHW is anomalous seawater temperature above the 90&lt;sup&gt;th&lt;/sup&gt; percentile of long-term climatology that lasts a minimum of 5 days (Hobday et al. &lt;span&gt;2018&lt;/span&gt;). Many experiments have been carried out for shorter durations, which by definition represent “heat spikes,” yet results were discussed in the MHW context. In addition, in several instances, experiments have used control temperatures that are, for example, a mean annual average. These neglect natural variability in temperature and the effect of temperature variation on thermal physiology across multiple time scales (from daily to seasonal). Finally, multiple studies have used MHW intensities (temperature anomaly above 90&lt;sup&gt;th&lt;/sup&gt; percentile of climatology) based on expected global mean intensities. These do not convey regionally relevant information on the impact of MHWs but rather a general estimation of change in thermal physiology in relation to temperature increase. Here, we reviewed the experimental studies examining the impact of MHWs on organisms from the last 5 yr (2019–2023) to highlight the extent of inconsistency in MHW simulation","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"10 1","pages":"1-4"},"PeriodicalIF":5.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Knowing your limits: Patterns and drivers of nutrient limitation and nutrient–chlorophyll relationships in US lakes","authors":"Ian M. McCullough,&nbsp;Xinyu Sun,&nbsp;Patrick J. Hanly,&nbsp;Patricia A. Soranno","doi":"10.1002/lol2.10420","DOIUrl":"10.1002/lol2.10420","url":null,"abstract":"<p>Although understanding nutrient limitation of primary productivity in lakes is among the oldest research priorities in limnology, there have been few broad-scale studies of the characteristics of phosphorus (P)-, nitrogen (N)-, and co-limited lakes and their environmental context. By analyzing 3342 US lakes with concurrent P, N, and chlorophyll <i>a</i> (Chl <i>a</i>) samples, we showed that US lakes are predominantly co-limited (43%) or P-limited (41%). Majorities of lakes were P-limited in the Northeast, Upper Midwest, and Southeast, and co-limitation was most prevalent in the interior and western United States. N-limitation (16%) was more prevalent than P-limitation in the Great Basin and Central Plains. Nutrient limitation was related to lake, watershed, and regional variables, including Chl <i>a</i> concentration, watershed soil, and wet nitrate deposition. N and P concentrations interactively affected nutrient–chlorophyll relationships, which differed by nutrient limitation. Our study demonstrates the value of considering P, N, and environmental context in nutrient limitation and nutrient–chlorophyll relationships.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 6","pages":"725-734"},"PeriodicalIF":5.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10420","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141489254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changes in phytoplankton size–structure alter trophic transfer in a temperate, coastal planktonic food web","authors":"Pierre Marrec,&nbsp;Susanne Menden-Deuer","doi":"10.1002/lol2.10410","DOIUrl":"10.1002/lol2.10410","url":null,"abstract":"<p>Microzooplankton grazing is an essential parameter to predict the fate of organic matter production in planktonic food webs. To identify predictors of grazing, we leveraged a 6-yr time series of coastal plankton growth and grazing rates across contrasting environmental conditions. Phytoplankton size–structure and trophic transfer were seasonally consistent with small phytoplankton cell dominance and low trophic transfer in summer, and large cell dominance and higher trophic transfer in winter. Departures from this pattern during two disruptive events revealed a critical link between phytoplankton size–structure and trophic transfer. An unusual summer bloom of large phytoplankton cells yielded high trophic transfer, and an atypical winter dominance of small phytoplankton resulted in seasonally atypical low trophic transfer. Environmental conditions during these events were neither seasonally atypical nor unique. Thus, phytoplankton size–structure rather than environmental conditions held a key-role driving trophic transfer. Phytoplankton size–structure is easily measurable and could impart predictive power of food-web structure and the fate of primary production in coastal ecosystems.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 5","pages":"624-633"},"PeriodicalIF":5.1,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10410","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-molecular-weight reduced sulfur substances: A major component of nonvolatile dissolved organic sulfur in the Pacific Ocean","authors":"Pierre Fourrier,&nbsp;Gabriel Dulaquais","doi":"10.1002/lol2.10417","DOIUrl":"10.1002/lol2.10417","url":null,"abstract":"<p>The low-molecular-weight (LMW) reduced sulfur substances (RSS) composition of dissolved organic matter (DOM) was examined along the GEOTRACES US-GP15 section in the Pacific Ocean. We demonstrate that LMW RSS constitutes a significant fraction of nonvolatile dissolved organic sulfur (DOS). While thiols such as glutathione were below our detection limit (300 pM), RSS containing two carbon (C) sulfur (S) bonds were present at concentrations in the hundreds of nM range. RSS accumulation was observed in subtropical waters. The most likely source of these RSS is microbial alteration of sulfurized DOM with production of secondary thioamidated metabolites. RSS are initially produced by cyanobacteria to mitigate copper and oxidative stress induced by UV-B irradiance. A preferential remineralization of RSS over dissolved organic carbon (DOC) in the upper 350 m suggests a partial lability of LMW DOS. Deeper, homogeneous concentrations and C : S ratio indicate increasing stability of this LMW DOS.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 6","pages":"735-744"},"PeriodicalIF":5.1,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141462802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy inputs imprint seasonality and fractal structure on river metabolic regimes","authors":"Yuseung Shin,&nbsp;James W. Jawitz,&nbsp;Matthew J. Cohen","doi":"10.1002/lol2.10416","DOIUrl":"10.1002/lol2.10416","url":null,"abstract":"<p>The temporal structures of gross primary production (GPP) and ecosystem respiration (ER) vary across time scales in response to complex interactions among dynamic drivers (e.g., flow, light, temperature, organic matter supply). To explore emergent patterns of river metabolic variation, we applied frequency-domain analysis to multiyear records of metabolism across 87 US rivers. We observed a dominant annual periodicity in metabolic variation and universal fractal scaling (i.e., power spectral density inversely correlated with frequency) at subannual frequencies, suggesting these are foundational temporal structures of river metabolic regimes. Frequency-domain patterns of river metabolism aligned best with drivers related to energy inputs: benthic light for GPP and GPP for ER. Simple river metabolism models captured frequency-domain patterns when parameterized with appropriate energy inputs but neglecting temperature controls. These results imply that temporal variation of energy supply imprints directly on metabolic signals and that frequency-domain patterns provide benchmark properties to predict river metabolic regimes.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 5","pages":"634-643"},"PeriodicalIF":5.1,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10416","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141452870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"pCO2 variation in ice-covered regions of the Arctic Ocean from the summer 2022 observation","authors":"Ahra Mo,&nbsp;Keyhong Park,&nbsp;Tae-Wook Kim,&nbsp;Doshik Hahm,&nbsp;Jung-Ok Choi,&nbsp;Sohyeon Geum,&nbsp;Jinyoung Jung,&nbsp;Eun Jin Yang","doi":"10.1002/lol2.10415","DOIUrl":"10.1002/lol2.10415","url":null,"abstract":"<p>To enhance our understanding of the carbon cycle in the Arctic Ocean, comprehensive observational data are crucial, including measurements from the underlying ice water. This study proposed a practical method for calibrating <i>p</i>CO₂ sensor using measured dissolved inorganic carbon and total alkalinity. Our findings suggested the minimum number of bottle samples needed for calibration to ensure 1% accuracy. Additionally, we identified the significant role of a decrease in dissolved inorganic carbon due to photosynthesis and the increase in buffer capacity of the seawater from the release of excess alkalinity by sea ice in regulating <i>p</i>CO₂. The mean air–sea CO₂ fluxes were −48.9 ± 44.6, −7.3 ± 14.6, and −1.4 ± 2.8 mmol m⁻² d⁻¹ in the southern Chukchi Sea, northern Chukchi Sea, and northern East Siberian Sea, respectively. We found a robust negative correlation between the flux and sea ice concentration in the Arctic Sea ice regions.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 5","pages":"573-582"},"PeriodicalIF":5.1,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141448288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changing phenology of benthic primary producers in inland waters: Current knowledge and future directions","authors":"Morgan Botrel,&nbsp;Roxane Maranger,&nbsp;Marta Maria Alirangues Nuñez,&nbsp;Garabet Kazanjian,&nbsp;Sarian Kosten,&nbsp;Mandy Velthuis,&nbsp;Sabine Hilt","doi":"10.1002/lol2.10381","DOIUrl":"10.1002/lol2.10381","url":null,"abstract":"<p>Benthic primary producers (BPP) in inland waters, including aquatic macrophytes and periphyton, are foundational habitats that are highly sensitive to multiple human drivers of environmental change. However, long-term seasonal monitoring of BPP is limited, leaving us with little information on the cause, directionality, and consequences of the potential shifts in timing of BPP life cycle events. Here, we review the literature on the phenological changes of BPP and show that BPP respond primarily to temperature, but also to other interactive drivers related to climate change and eutrophication. In addition, we present four rare case studies where BPP display strong and earlier shifts in event timing associated with increasing temperature and discuss potential impacts of these changes on ecosystem functioning. Given the responsive nature of BPP to multiple human drivers, we provide suggestions on how to improve basic monitoring to better understand the future impact of phenological changes of this critical habitat.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"340-353"},"PeriodicalIF":5.1,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10381","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate-influenced phenology of larval fish transport in a large lake","authors":"Spencer T. Gardner,&nbsp;Mark D. Rowe,&nbsp;Pengfei Xue,&nbsp;Xing Zhou,&nbsp;Peter J. Alsip,&nbsp;David B. Bunnell,&nbsp;Paris D. Collingsworth,&nbsp;Edward S. Rutherford,&nbsp;Tomas O. Höök","doi":"10.1002/lol2.10414","DOIUrl":"10.1002/lol2.10414","url":null,"abstract":"<p>Elucidating physical transport phenologies in large lakes can aid understanding of larval recruitment dynamics. Here, we integrate a series of climate, hydrodynamic, biogeochemical, and Lagrangian particle dispersion models to: (1) simulate hatch and transport of fish larvae throughout an illustrative large lake, (2) evaluate patterns of historic and potential future climate-induced larval transport, and (3) consider consequences for overlap with suitable temperatures and prey. Simulations demonstrate that relative offshore transport increases seasonally, with shifts toward offshore transport occurring earlier during relatively warm historic and future simulations. Intra- and inter-annual trends in transport were robust to assumed pelagic larval duration and precise location and timing of hatching. Larvae retained nearshore generally encountered more favorable temperatures and zooplankton densities compared to larvae transported offshore. Larval exploitation of nearshore resources under climate change may depend on a concomitant shift to earlier spawning and hatch times in advance of earlier offshore transport.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"376-387"},"PeriodicalIF":5.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10414","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141386084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Idiosyncratic phenology of greenhouse gas emissions in a Mediterranean reservoir","authors":"Eva Rodríguez-Velasco,&nbsp;Ignacio Peralta-Maraver,&nbsp;Andrés Martínez-García,&nbsp;Miriam García-Alguacil,&nbsp;Félix Picazo,&nbsp;Rodrigo J. Gonçalves,&nbsp;Cintia L. Ramón,&nbsp;Rafael Morales-Baquero,&nbsp;Francisco J. Rueda,&nbsp;Isabel Reche","doi":"10.1002/lol2.10409","DOIUrl":"10.1002/lol2.10409","url":null,"abstract":"<p>Extreme hydrological and thermal regimes characterize the Mediterranean zone and can influence the phenology of greenhouse gas (GHG) emissions in reservoirs. Our study examined the seasonal changes in GHG emissions of a shallow, eutrophic, hardwater reservoir in Spain. We observed distinctive seasonal patterns for each gas. CH₄ emissions substantially increased during stratification, influenced predominantly by the increase in water temperature, net ecosystem production, and the decline in reservoir mean depth. N₂O emissions mirrored CH₄'s seasonal trend, significantly correlating to water temperature, wind speed, and gross primary production. Conversely, CO₂ emissions decreased during stratification and displayed a quadratic, rather than a linear relationship with water temperature—an unexpected deviation from CH₄ and N₂O emission patterns—likely associated with photosynthetic uptake of bicarbonate and formation of intracellular calcite that might be exported to sediments. This investigation highlights the imperative of integrating these idiosyncratic patterns into GHG emissions models, enhancing their predictive power.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"364-375"},"PeriodicalIF":5.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10409","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141382319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}