Biological Bulletin最新文献_第3页

Mechanistic Temperature-Size Rule Explanation Should Reconcile Physiological and Mortality Responses to Temperature. 机械温度大小规则解释应协调生理和死亡对温度的反应。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722027

Asta Audzijonyte, Egle Jakubavičiūtė, Max Lindmark, Shane A Richards

{"title":"Mechanistic Temperature-Size Rule Explanation Should Reconcile Physiological and Mortality Responses to Temperature.","authors":"Asta Audzijonyte, Egle Jakubavičiūtė, Max Lindmark, Shane A Richards","doi":"10.1086/722027","DOIUrl":"https://doi.org/10.1086/722027","url":null,"abstract":"AbstractThe temperature-size rule is one of the universal rules in ecology and states that ectotherms in warmer waters will grow faster as juveniles, mature at smaller sizes and younger ages, and reach smaller maximum body sizes. Many models have unsuccessfully attempted to reproduce temperature-size rule-consistent life histories by using two-term (anabolism and catabolism) Pütter-type growth models, such as the von Bertalanffy. Here, we present a physiologically structured individual growth model, which incorporates an energy budget and optimizes energy allocation to growth, reproduction, and reserves. Growth, maturation, and reproductive output emerge as a result of life-history optimization to specific physiological rates and mortality conditions. To assess which processes can lead to temperature-size rule-type life histories, we simulate 42 scenarios that differ in temperature and body size dependencies of intake, metabolism, and mortality rates. Results show that the temperature-size rule can emerge in two ways. The first way requires both intake and metabolism to increase with temperature, but the temperature-body size interaction of the two rates must lead to relatively faster intake increase in small individuals and relatively larger metabolism increase in large ones. The second way requires only higher temperature-driven natural mortality and faster intake rates in early life (no change in metabolic rates is needed). This selects for faster life histories with earlier maturation and increased reproductive output. Our model provides a novel mechanistic and evolutionary framework for identifying the conditions necessary for the temperature-size rule. It shows that the temperature-size rule is likely to reflect both physiological changes and life-history optimization and that use of von Bertalanffy-type models, which do not include reproduction processes, can hinder our ability to understand and predict ectotherm responses to climate change.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Hypoxia and High Temperature as Interacting Stressors: Will Plasticity Promote Resilience of Fishes in a Changing World? 缺氧和高温作为相互作用的应激源:在变化的世界中，可塑性会促进鱼类的恢复力吗?

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722115

Madison L Earhart, Tessa S Blanchard, Adam A Harman, Patricia M Schulte

{"title":"Hypoxia and High Temperature as Interacting Stressors: Will Plasticity Promote Resilience of Fishes in a Changing World?","authors":"Madison L Earhart, Tessa S Blanchard, Adam A Harman, Patricia M Schulte","doi":"10.1086/722115","DOIUrl":"https://doi.org/10.1086/722115","url":null,"abstract":"AbstractDetermining the resilience of a species or population to climate change stressors is an important but difficult task because resilience can be affected both by genetically based variation and by various types of phenotypic plasticity. In addition, most of what is known about organismal responses is for single stressors in isolation, but environmental change involves multiple environmental factors acting in combination. Here, our goal is to summarize what is known about phenotypic plasticity in fishes in response to high temperature and low oxygen (hypoxia) in combination across multiple timescales, to ask how much resilience plasticity may provide in the face of climate change. There are relatively few studies investigating plasticity in response to these environmental stressors in combination; but the available data suggest that although fish have some capacity to adjust their phenotype and compensate for the negative effects of acute exposure to high temperature and hypoxia through acclimation or developmental plasticity, compensation is generally only partial. There is very little known about intergenerational and transgenerational effects, although studies on each stressor in isolation suggest that both positive and negative impacts may occur. Overall, the capacity for phenotypic plasticity in response to these two stressors is highly variable among species and extremely dependent on the specific context of the experiment, including the extent and timing of stressor exposure. This variability in the nature and extent of plasticity suggests that existing phenotypic plasticity is unlikely to adequately buffer fishes against the combined stressors of high temperature and hypoxia as our climate warms.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Structure-Function Relationships of Oxygen Transport Proteins in Marine Invertebrates Enduring Higher Temperatures and Deoxygenation. 海洋无脊椎动物耐高温脱氧氧转运蛋白的结构-功能关系。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722472

Christopher J Coates, Flávia A Belato, Kenneth M Halanych, Elisa M Costa-Paiva

{"title":"Structure-Function Relationships of Oxygen Transport Proteins in Marine Invertebrates Enduring Higher Temperatures and Deoxygenation.","authors":"Christopher J Coates, Flávia A Belato, Kenneth M Halanych, Elisa M Costa-Paiva","doi":"10.1086/722472","DOIUrl":"https://doi.org/10.1086/722472","url":null,"abstract":"AbstractPredictions for climate change-to lesser and greater extents-reveal a common scenario in which marine waters are characterized by a deadly trio of stressors: higher temperatures, lower oxygen levels, and acidification. Ectothermic taxa that inhabit coastal waters, such as shellfish, are vulnerable to rapid and prolonged environmental disturbances, such as heatwaves, pollution-induced eutrophication, and dysoxia. Oxygen transport capacity of the hemolymph (blood equivalent) is considered the proximal driver of thermotolerance and respiration in many invertebrates. Moreover, maintaining homeostasis under environmental duress is inextricably linked to the activities of the hemolymph-based oxygen transport or binding proteins. Several protein groups fulfill this role in marine invertebrates: copper-based extracellular hemocyanins, iron-based intracellular hemoglobins and hemerythrins, and giant extracellular hemoglobins. In this brief text, we revisit the distribution and multifunctional properties of oxygen transport proteins, notably hemocyanins, in the context of climate change, and the consequent physiological reprogramming of marine invertebrates.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10433502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Experimental Evolution Shows Body Size Decrease in Response to Hypoxia, with a Complex Effect on Plastic Size Response to Temperature. 实验进化表明，机体尺寸对缺氧的响应减小，对温度对塑料尺寸的响应有复杂的影响。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722028

Aleksandra Walczyńska, Mateusz Sobczyk

{"title":"Experimental Evolution Shows Body Size Decrease in Response to Hypoxia, with a Complex Effect on Plastic Size Response to Temperature.","authors":"Aleksandra Walczyńska, Mateusz Sobczyk","doi":"10.1086/722028","DOIUrl":"https://doi.org/10.1086/722028","url":null,"abstract":"AbstractThere is a scientific debate whether oxygen concentration may be a factor driving the pattern of size decrease at higher temperature. Central to this debate is the fact that oxygen availability relative to demand for living organisms decreases with increasing temperature. We examined whether rotifers Lecane inermis exposed to hypoxic conditions would evolve smaller sizes than rotifers exposed to normoxic conditions, using experimental evolution with the same fluctuating temperature but differentiated by three regimes of oxygen availability: normoxia, hypoxia throughout the whole thermal range, and hypoxia only at the highest temperature. Immediately after the six-month experiment (more than 90 generations), we tested the plasticity of size responses to temperature in three post-evolution groups, and we related these responses to fitness. The results show that normoxic rotifers had evolved significantly larger sizes than two hypoxic rotifer groups, which were similar in size. All three groups displayed similar plastic body size reductions in response to warming over the range of temperatures they were exposed to during the period of experimental evolution, but they showed different and complex responses at two temperatures below this range. Any type of plastic response to different temperatures resulted in a similar fitness pattern across post-evolution groups. We conclude that (i) these rotifers showed a genetic basis for the pattern of size decrease following evolution under both temperature-dependent and temperature-independent hypoxia; and (ii) plastic body size responds consistently to temperatures that are within the thermal range that the rotifers experienced during their evolutionary history, but responses become more noisy at novel temperatures, suggesting the importance of evolutionary responses to reliable environmental cues.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Impacts of Low Oxygen on Marine Life: Neglected, but a Crucial Priority for Research. 低氧对海洋生物的影响:被忽视，但研究的关键优先事项。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/721468

Francisco O Borges, Eduardo Sampaio, Catarina P Santos, Rui Rosa

{"title":"Impacts of Low Oxygen on Marine Life: Neglected, but a Crucial Priority for Research.","authors":"Francisco O Borges, Eduardo Sampaio, Catarina P Santos, Rui Rosa","doi":"10.1086/721468","DOIUrl":"https://doi.org/10.1086/721468","url":null,"abstract":"AbstractGlobal ocean O2 content has varied significantly across the eons, both shaping and being shaped by the evolutionary history of life on planet Earth. Indeed, past O2 fluctuations have been associated with major extinctions and the reorganization of marine biota. Moreover, its most recent iteration-now anthropogenically driven-represents one of the most prominent challenges for both marine ecosystems and human societies, with ocean deoxygenation being regarded as one of the main drivers of global biodiversity loss. Yet ocean deoxygenation has received far less attention than concurrent environmental variables of marine climate change, namely, ocean warming and acidification, particularly in the field of experimental marine ecology. Together with the lack of consistent criteria defining gradual and acute changes in O2 content, a general lack of multifactorial studies featuring all three drivers and their interactions prevents an adequate interpretation of the potential effects of extreme and gradual deoxygenation. We present a comprehensive overview of the interplay between O2 and marine life across space and time and discuss the current knowledge gaps and future steps for deoxygenation research. This work may also contribute to the ongoing call for an integrative perspective on the combined effects of these three drivers of change for marine organisms and ecosystems worldwide.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Immune Defense in Hypoxic Waters: Impacts of CO₂ Acidification. 低氧水域的免疫防御:二氧化碳酸化的影响。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/721322

Karen G Burnett, Louis E Burnett

{"title":"Immune Defense in Hypoxic Waters: Impacts of CO2 Acidification.","authors":"Karen G Burnett, Louis E Burnett","doi":"10.1086/721322","DOIUrl":"https://doi.org/10.1086/721322","url":null,"abstract":"AbstractPeriodic episodes of low oxygen (hypoxia) and elevated CO2 (hypercapnia) accompanied by low pH occur naturally in estuarine environments. Under the influence of climate change, the geographic range and intensity of hypoxia and hypercapnic hypoxia are predicted to increase, potentially jeopardizing the survival of economically and ecologically important organisms that use estuaries as habitat and nursery grounds. In this review we synthesize data from published studies that evaluate the impact of hypoxia and hypercapnic hypoxia on the ability of crustaceans and bivalve molluscs to defend themselves against potential microbial pathogens. Available data indicate that hypoxia generally has suppressive effects on host immunity against bacterial pathogens as measured by in vitro and in vivo assays. Few studies have documented the effects of hypercapnic hypoxia on crustaceans or bivalve immune defense, with a range of outcomes suggesting that added CO2 might have additive, negative, or no interactions with the effects of hypoxia alone. This synthesis points to the need for more partial pressure of O2 × low pH factorial design experiments and recommends the development of new host∶pathogen challenge models incorporating natural transmission of a wide range of viruses, bacteria, and parasites, along with novel in vivo tracking systems that better quantify how pathogens interact with their hosts in real time under laboratory and field conditions.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10448007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Compound Extreme Events Induce Rapid Mortality in a Tropical Sea Urchin. 复合极端事件导致热带海胆快速死亡。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722283

Noelle Lucey, Camille Aube, Antonia Herwig, Rachel Collin

{"title":"Compound Extreme Events Induce Rapid Mortality in a Tropical Sea Urchin.","authors":"Noelle Lucey, Camille Aube, Antonia Herwig, Rachel Collin","doi":"10.1086/722283","DOIUrl":"https://doi.org/10.1086/722283","url":null,"abstract":"AbstractThe frequency, magnitude, and duration of marine heatwaves and deoxygenation events are increasing globally. Recent research suggests that their co-occurrence is more common than previously thought and that their combination can have rapid, dire biological impacts. We used the sea urchin Echinometra lucunter to determine whether mortality occurs faster when deoxygenation events are combined with extreme heating (compound events), compared to deoxygenation events alone. We also tested whether prior exposure to local heatwave conditions accentuates the impacts of compound events. Animals were first exposed for five days to either ambient temperature (28 °C) or a warmer temperature that met the minimum criteria for a local heatwave (30.5 °C). Animals were then exposed to hypoxia, defined as oxygen levels 35% below their average critical oxygen limit, combined with ambient or extreme field temperatures (28 °C, 32 °C). Subsets of animals were removed from the hypoxic treatments every 3 hours for 24 hours to determine how long they could survive. Prior exposure to heatwave conditions did not help or hinder survival under hypoxic conditions, and animals exposed to hypoxia under ambient temperatures experienced little mortality. However, when hypoxia was coupled with extreme temperatures (32 °C), 55% of the animals died within 24 hours. On the reefs at our Panama study site, we found that extreme hypoxic conditions only ever occurred during marine heatwave events, with four compound events occurring in 2018. These results show that short durations (∼1 day) of compound events can be catastrophic and that increases in their duration will severely threaten sea urchin populations.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10433501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Interactive Effects of Increasing Temperature and Decreasing Oxygen on Coastal Copepods. 增温减氧对沿海桡足类的交互作用。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/722111

Michael R Roman, James J Pierson

{"title":"Interactive Effects of Increasing Temperature and Decreasing Oxygen on Coastal Copepods.","authors":"Michael R Roman, James J Pierson","doi":"10.1086/722111","DOIUrl":"https://doi.org/10.1086/722111","url":null,"abstract":"AbstractThe copepods of coastal seas are experiencing warming water temperatures, which increase their oxygen demand. In addition, many coastal seas are also losing oxygen because of deoxygenation due to cultural eutrophication. Warming coastal seas have changed copepod species' composition and biogeographic boundaries and, in many cases, resulted in copepod communities that have shifted in size distribution to smaller species. While increases in ambient water temperatures can explain some of these changes, deoxygenation has also been shown to result in reduced copepod growth rates, reduced size at adulthood, and altered species composition. In this review we focus on the interactive effects of temperature and dissolved oxygen on pelagic copepods, which dominate coastal zooplankton communities. The uniformity in ellipsoidal shape, the lack of external oxygen uptake organs, and the pathway of oxygen uptake through the copepod's integument make calanoid copepods ideal candidates for testing the use of an allometric approach to predict copepod size with increasing water temperatures and decreasing oxygen in coastal seas. Considering oxygen and temperature as a combined and interactive driver in coastal ecosystems will provide a unifying approach for future predictions of coastal copepod communities and their impact on fisheries and biogeochemical cycles. Given the prospect of increased oxygen limitation of copepods in warming seas, increased knowledge of the physiological ecology of present-day copepods in coastal deoxygenated zones can provide insights into the copepod communities that will inhabit a future warmer ocean.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10433499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Breathless through Time: Oxygen and Animals across Earth's History. 《穿越时空:地球历史上的氧气和动物》

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/721754

Erik A Sperling, Thomas H Boag, Murray I Duncan, Cecilia R Endriga, J Andres Marquez, Daniel B Mills, Pedro M Monarrez, Judith A Sclafani, Richard G Stockey, Jonathan L Payne

{"title":"Breathless through Time: Oxygen and Animals across Earth's History.","authors":"Erik A Sperling, Thomas H Boag, Murray I Duncan, Cecilia R Endriga, J Andres Marquez, Daniel B Mills, Pedro M Monarrez, Judith A Sclafani, Richard G Stockey, Jonathan L Payne","doi":"10.1086/721754","DOIUrl":"https://doi.org/10.1086/721754","url":null,"abstract":"AbstractOxygen levels in the atmosphere and ocean have changed dramatically over Earth history, with major impacts on marine life. Because the early part of Earth's history lacked both atmospheric oxygen and animals, a persistent co-evolutionary narrative has developed linking oxygen change with changes in animal diversity. Although it was long believed that oxygen rose to essentially modern levels around the Cambrian period, a more muted increase is now believed likely. Thus, if oxygen increase facilitated the Cambrian explosion, it did so by crossing critical ecological thresholds at low O2. Atmospheric oxygen likely remained at low or moderate levels through the early Paleozoic era, and this likely contributed to high metazoan extinction rates until oxygen finally rose to modern levels in the later Paleozoic. After this point, ocean deoxygenation (and marine mass extinctions) is increasingly linked to large igneous province eruptions-massive volcanic carbon inputs to the Earth system that caused global warming, ocean acidification, and oxygen loss. Although the timescales of these ancient events limit their utility as exact analogs for modern anthropogenic global change, the clear message from the geologic record is that large and rapid CO2 injections into the Earth system consistently cause the same deadly trio of stressors that are observed today. The next frontier in understanding the impact of oxygen changes (or, more broadly, temperature-dependent hypoxia) in deep time requires approaches from ecophysiology that will help conservation biologists better calibrate the response of the biosphere at large taxonomic, spatial, and temporal scales.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Reduced Oxygen Impairs Photobehavior in Marine Invertebrate Larvae. 缺氧损害海洋无脊椎动物幼虫的光行为。

IF 1.6 4区生物学

Biological Bulletin Pub Date : 2022-10-01 DOI: 10.1086/717565

Lillian R McCormick, Lisa A Levin, Nicholas W Oesch

{"title":"Reduced Oxygen Impairs Photobehavior in Marine Invertebrate Larvae.","authors":"Lillian R McCormick, Lisa A Levin, Nicholas W Oesch","doi":"10.1086/717565","DOIUrl":"https://doi.org/10.1086/717565","url":null,"abstract":"AbstractOrganisms in coastal waters experience naturally high oxygen variability and steep oxygen gradients with depth, in addition to ocean deoxygenation. They often undergo diel vertical migration involving a change in irradiance that initiates a visual behavior. Retinal function has been shown to be highly sensitive to oxygen loss; here we assess whether visual behavior (photobehavior) in paralarvae of the squid Doryteuthis opalescens and the octopus Octopus bimaculatus is affected by low oxygen conditions, using a novel behavioral paradigm. Larvae showed an irradiance-dependent, descending photobehavior after extinction of the light stimulus, measured through the change in vertical position of larvae in the chamber. The magnitude of photobehavior was decreased as oxygen was reduced, and the response was entirely gone at <6.4 kPa partial pressure of oxygen (<74.7 μmol kg-1 at 15.3 °C) in D. opalescens paralarvae. Oxygen also affected photobehavior in O. bimaculatus paralarvae. The mean vertical velocity of paralarvae was unaffected by exposure to reduced oxygen, indicating that oxygen deficits selectively affect vision prior to locomotion. These findings suggest that variable and declining oxygen conditions in coastal upwelling areas and elsewhere will impair photobehavior and likely affect the distribution, migration behavior, and survival of highly visual marine species.","PeriodicalId":55376,"journal":{"name":"Biological Bulletin","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10441700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5