Limnology and Oceanography Letters最新文献

{"title":"Deep-learning-powered data analysis in plankton ecology","authors":"Harshith Bachimanchi,&nbsp;Matthew I. M. Pinder,&nbsp;Chloé Robert,&nbsp;Pierre De Wit,&nbsp;Jonathan Havenhand,&nbsp;Alexandra Kinnby,&nbsp;Daniel Midtvedt,&nbsp;Erik Selander,&nbsp;Giovanni Volpe","doi":"10.1002/lol2.10392","DOIUrl":"10.1002/lol2.10392","url":null,"abstract":"<p>The implementation of deep learning algorithms has brought new perspectives to plankton ecology. Emerging as an alternative approach to established methods, deep learning offers objective schemes to investigate plankton organisms in diverse environments. We provide an overview of deep-learning-based methods including detection and classification of phytoplankton and zooplankton images, foraging and swimming behavior analysis, and finally ecological modeling. Deep learning has the potential to speed up the analysis and reduce the human experimental bias, thus enabling data acquisition at relevant temporal and spatial scales with improved reproducibility. We also discuss shortcomings and show how deep learning architectures have evolved to mitigate imprecise readouts. Finally, we suggest opportunities where deep learning is particularly likely to catalyze plankton research. The examples are accompanied by detailed tutorials and code samples that allow readers to apply the methods described in this review to their own data.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"324-339"},"PeriodicalIF":5.1,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140620483","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":"Recent warming of the Kuroshio Current has promoted offshore sediment transport in the Yellow Sea","authors":"Yong Shi,&nbsp;Xiaomei Xu,&nbsp;Tao Liu,&nbsp;Guang Yang,&nbsp;Shengjing Liu,&nbsp;Jixuan Lyu,&nbsp;Shuo Zhang,&nbsp;Hui Sheng,&nbsp;Jianhua Gao","doi":"10.1002/lol2.10396","DOIUrl":"10.1002/lol2.10396","url":null,"abstract":"<p>As cross-shelf gradients of most properties are typically much steeper than those in the alongshore direction, transport across isobaths tends to be inhibited, particularly at oceanic fronts where cross-shelf gradients are markedly pronounced. Consequently, variations in cross-shelf gradients may exert a significant influence on offshore transport; however, this influence is not yet well understood. This study employs reconstructed daily suspended sediment concentration (SSC) data from the Yellow Sea's offshore region to investigate the dynamics of offshore transport. Our analysis on an interannual scale shows that offshore SSC correlates more with temperature gradients at the oceanic front than with winter storms, despite the latter's vital role in causing frontal instability. The observed increase in offshore transport over the past two decades is likely connected to Kuroshio Current warming, which has strengthened the horizontal density gradient at the oceanic front, driving the strengthened offshore transport of coastal sediments during instability episodes.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"452-460"},"PeriodicalIF":5.1,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10396","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140620190","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":"Weakening Indian Ocean carbon uptake in 2015: The role of amplified basin-wide warming and reduced Indonesian throughflow","authors":"Enhui Liao,&nbsp;Wenfang Lu,&nbsp;Liang Xue,&nbsp;Yan Du","doi":"10.1002/lol2.10397","DOIUrl":"10.1002/lol2.10397","url":null,"abstract":"<p>In 2015, the Indian Ocean exhibits an exceptionally weakened CO₂ uptake, highlighting strong interannual variability of ocean carbon sink. By utilizing multiple ocean CO₂ partial pressure (<i>p</i>CO₂) data and a state-of-the-art ocean biogeochemical model, we show that the 2015 ocean CO₂ anomaly is characterized by a basin-wide amplification of ocean <i>p</i>CO₂, differing from ocean <i>p</i>CO₂ responses to other Indian Ocean Dipole events (e.g., 1997 and 2019). The distinct ocean <i>p</i>CO₂ anomaly is attributed to an amplified warming and an unprecedented weakening Indonesian Throughflow under the influence of co-occurrence of positive IOD and extreme El Niño in 2015. The amplified warming drives higher ocean <i>p</i>CO₂ in the western and central Indian Ocean, while the ITF transports anomalously high ocean <i>p</i>CO₂ water from the Pacific Ocean to the southeastern Indian Ocean. This newly identified ocean carbon response provides deeper insights into the Indian Ocean carbon interannual variability.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"442-451"},"PeriodicalIF":5.1,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140607955","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":"Projecting expected growth period of bivalves in a coastal temperate sea","authors":"Petra Zemunik Selak,&nbsp;Cléa Denamiel,&nbsp;Melita Peharda,&nbsp;Bernd R. Schöne,&nbsp;Julien Thébault,&nbsp;Hana Uvanović,&nbsp;Krešimir Markulin,&nbsp;Ivica Vilibić","doi":"10.1002/lol2.10393","DOIUrl":"10.1002/lol2.10393","url":null,"abstract":"<p>The impact of climate warming on coastal benthic fauna is already observed, but forecasting their long-term fate remains challenging. This study uses δ¹⁸O_shell data of specimens of five bivalve species collected at six locations and results from kilometer-scale atmosphere–ocean climate model for the time intervals of 1987–2017 and 2070–2100, to estimate changes in bivalve growth phenology. All species will benefit from climate warming during winter, experiencing a longer growing season than currently. The growth of <i>Aequipecten opercularis</i>, <i>Flexopecten glaber</i>, and <i>Pecten jacobaeus</i> will decrease in summer, resulting in up to 3 months of reduced growth per year. <i>Glycymeris pilosa</i> and <i>Venus verrucosa</i> in the southern Adriatic Sea will be more affected than those in the north, with up to 4 months longer annual growth. These findings can inform adaptation plans for bivalve management in the Adriatic Sea but also in areas where the studied species are present.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 6","pages":"815-826"},"PeriodicalIF":5.1,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10393","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140608077","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":"Polyphosphate phosphorus in the Great Lakes","authors":"Xingyu Yang,&nbsp;Rixuan Gao,&nbsp;Audrey Huff,&nbsp;Sergei Katsev,&nbsp;Ted Ozersky,&nbsp;Jiying Li","doi":"10.1002/lol2.10394","DOIUrl":"10.1002/lol2.10394","url":null,"abstract":"<p>Polyphosphate (polyP) is important to phytoplankton ecology, but a unified view of its variability and roles in ecosystem-scale phosphorus (P) cycling is lacking. We study polyP in the world's largest freshwater ecosystem, the Laurentian Great Lakes, covering pelagic to nearshore areas across a wide nutrient gradient. We show that polyP (average 10.99 ± 3.90 nmol L⁻¹) constitutes 3.8–30.2% (average 18.1 ± 7.2%) of total particulate P (TPP). PolyP accumulation is higher in low-P pelagic waters compared with more productive nearshore areas. PolyP is preferentially degraded in the water column of the Great Lakes, enhancing P recycling and relieving the nitrogen (N) : P imbalance. Our data enables a coherent large-scale freshwater-to-oceanic comparison. We show that while different plankton groups accumulate different levels of polyP with smaller plankton accumulating more, P availability is the key driver of polyP variability within and across systems.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 5","pages":"602-611"},"PeriodicalIF":5.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10394","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140557350","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":"The aquaculture industry as a global network of perturbation experiments","authors":"Jemma M. Fadum,&nbsp;Ed K. Hall,&nbsp;Elena Litchman,&nbsp;Emily J. Zakem","doi":"10.1002/lol2.10384","DOIUrl":"10.1002/lol2.10384","url":null,"abstract":"&lt;p&gt;The industrial production of finfish (e.g., salmon, tilapia, and carp) has well documented ecological consequences (Ottinger et al. &lt;span&gt;2016&lt;/span&gt;; Carballeira Braña et al. &lt;span&gt;2021&lt;/span&gt;). Negative impacts of the aquaculture industry include excessive nutrient loading (Islam &lt;span&gt;2005&lt;/span&gt;) and subsequent eutrophication, disease introduction (Kennedy et al. &lt;span&gt;2016&lt;/span&gt;), heavy metals pollution (Emenike et al. &lt;span&gt;2022&lt;/span&gt;), and the assimilation of escapee fish into wild populations (Toledo-Guedes et al. &lt;span&gt;2014&lt;/span&gt;). Despite ecological concerns, the aquaculture industry has continued to grow in recent decades (Naylor et al. &lt;span&gt;2021&lt;/span&gt;, FAO &lt;span&gt;2022&lt;/span&gt;), driven by increasing market demands and rapidly declining wild fisheries. The continued pursuit of a sustainable future for aquaculture is critical not only to meet global food demands, but also to support local economies and communities. Though by no means a silver bullet for solving systematic inequities, aquaculture can play a critical role in improving public health and well-being by increasing access to nutrition (Gephart et al. &lt;span&gt;2021&lt;/span&gt;), providing employment opportunities, especially for women (Gopal et al. &lt;span&gt;2020&lt;/span&gt;), and contributing to sustainable development overall (Subasinghe et al. &lt;span&gt;2009&lt;/span&gt;). In terms of the United Nation's Sustainable Development Goals (SDGs), truly sustainable aquaculture (i.e., continued production in farms that do not adversely alter the ecosystem they inhabit) is well suited to tackling several of the 17 goals, including Zero Hunger (SDG 2) (Stead &lt;span&gt;2019&lt;/span&gt;) and those related to economic opportunities, particularly zero poverty, and good jobs and economic growth (SDGs 1 and 8, respectively), as well as many of the targets and related indicators associated with the SDGs (Griffin et al. &lt;span&gt;2019&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;In addition to the above costs and benefits, we posit that global-scale aquaculture operations constitute an untapped research opportunity that goes beyond the study of environmental impacts of aquaculture and the development of more sustainable methods. We propose that aquaculture operations, in particular cage culture farms, act as perturbation experiments and are therefore well suited for fundamental research in ecology, biogeochemistry, limnology, and oceanography (among other fields). In the following sections we explore this “aquaculture as perturbation experiments” framework. We first identify the elements of cage culture farms that make them good candidates for replicable, global-scale perturbation experiment-based research. We then explore potential research opportunities enabled by the framework to advance our understanding of ecosystem and community ecology, global biogeochemical cycling, and carbon sequestration.&lt;/p&gt;&lt;p&gt;Mechanisms of eutrophication as well as the eutrophying effects of aquaculture have been well documented (Gowen &lt;span&gt;1994&lt;/span&gt;; Smith and Schindler &lt;","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 4","pages":"317-323"},"PeriodicalIF":5.1,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10384","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140557340","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":"Concentration and compositional controls on degradation of permafrost-derived dissolved organic matter on the Qinghai–Tibetan Plateau","authors":"Yinghui Wang,&nbsp;Yasong Wang,&nbsp;Lulu Han,&nbsp;Amy M. McKenna,&nbsp;Anne M. Kellerman,&nbsp;Robert G. M. Spencer,&nbsp;Yuanhe Yang,&nbsp;Yunping Xu","doi":"10.1002/lol2.10388","DOIUrl":"10.1002/lol2.10388","url":null,"abstract":"<p>Understanding the fate of permafrost-derived dissolved organic matter (DOM) is critical for unraveling its role in carbon cycling. However, it remains unclear whether the high lability of permafrost-derived DOM can be attributed to intrinsic chemical properties or elevated carbon concentrations. We investigated the dynamics of permafrost DOM from the Qinghai–Tibetan Plateau using both biodegradation and photodegradation experiments. Biodegradation and photodegradation of permafrost-derived DOM exhibited distinct qualitative preferences for specific chemical groups (i.e., peptide-like and aromatics, respectively). Notably, reducing the initial concentration of dissolved organic carbon (DOC) by half and a quarter resulted in shifts in biodegradable DOC content from 11.2% to 11.5% and 8.5%, respectively, accompanied by a corresponding decrease in the biodegradation rate from 0.11 to 0.06 and 0.03. This insight highlights the importance of recognizing the interplay between DOM quality and concentration and bears broader significance for our understanding of the fate of permafrost-derived DOM in natural ecosystems.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 5","pages":"563-572"},"PeriodicalIF":5.1,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10388","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140542258","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":"Widespread warming of Earth's estuaries","authors":"Punwath Prum,&nbsp;Lora Harris,&nbsp;John Gardner","doi":"10.1002/lol2.10389","DOIUrl":"10.1002/lol2.10389","url":null,"abstract":"<p>Water temperature responses to climate change may vary across Earth's estuaries. To understand how climate change influences estuarine surface water temperature, we need global, long-term records of estuarine temperature. Here, we generated surface water temperature data over 1060 estuaries globally using Landsat 5, 7, and 8 from 1985 to 2022 and compared water warming rates with local air temperature warming rates. Forty-seven percent of Earth's estuaries are warming, with a global average warming rate of 0.070 ± 0.004°C yr⁻¹ (median = 0.060°C yr⁻¹). Estuaries at higher latitudes showed rapid warming. A 1°C increase in air temperature could lead to a 0.81°C increase in estuarine surface water warming and 1.3°C increase in estuaries above 60.5°N. We inferred the potential influences over estuarine warming based on distinct global spatial patterns in water and air warming and discussed the effects of warming water temperature on estuarine metabolism and water quality.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 3","pages":"268-275"},"PeriodicalIF":7.8,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10389","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140349705","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":"Plankton blooms over the annual cycle shape trophic interactions under climate change","authors":"Kinlan M. G. Jan,&nbsp;Baptiste Serandour,&nbsp;Jakob Walve,&nbsp;Monika Winder","doi":"10.1002/lol2.10385","DOIUrl":"10.1002/lol2.10385","url":null,"abstract":"<p>Understanding species phenology and temporal co-occurrence across trophic levels is essential to assess anthropogenic impacts on ecological interactions. We analyzed 15 yr of monitoring data to identify trends and drivers of timing and magnitude of bloom-forming phytoplankton and diverse zooplankton taxa in the central Baltic Sea. We show that the timings of phytoplankton blooms advance, whereas crustacean zooplankton seasonal timings remain constant. This increasing offset with the spring bloom is linked to the decline of <i>Pseudocalanus</i>, a key copepod sustaining pelagic fish production. The majority of copepod and cladoceran taxa, however, are co-occurring with summer blooms. We also find new developing fall blooms, fueling secondary production later in the season. Our study highlights that response to climate change differs within and between functional groups, stressing the importance of investigating plankton phenologies over the entire annual cycle in pelagic systems.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 3","pages":"209-218"},"PeriodicalIF":7.8,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140346007","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":"Earlier ice melt increases hypolimnetic oxygen despite regional warming in small Arctic lakes","authors":"Václava Hazuková,&nbsp;Benjamin T. Burpee,&nbsp;Robert M. Northington,&nbsp;N. John Anderson,&nbsp;Jasmine E. Saros","doi":"10.1002/lol2.10386","DOIUrl":"10.1002/lol2.10386","url":null,"abstract":"<p>Although trends toward earlier ice-out have been documented globally, the links between ice-out timing and lake thermal and biogeochemical structure vary spatially. In high-latitude lakes where ice-out occurs close to peak intensity of solar radiation, these links remain unclear. Using a long-term dataset from 13 lakes in West Greenland, we investigated how changing ice-out and weather conditions affect lake thermal structure and oxygen concentrations. In early ice-out years, lakes reach higher temperatures across the water column and have deeper epilimnia. Summer hypolimnia are the warmest (~ 11°C) in years when cooler air temperatures follow early ice-out, allowing full lake turnover. Due to the higher potential for substantive spring mixing in early ice-out years, a warmer hypolimnion is associated with higher dissolved oxygen concentrations. By affecting variability in spring mixing, the consequences of shifts in ice phenology for lakes at high latitudes differ from expectations based on temperate regions.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"9 3","pages":"258-267"},"PeriodicalIF":7.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.10386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140340809","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}