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Ocean oxygen loss (deoxygenation) is increasing due to climate warming. This warming, together with nutrient loading, is causing many marine and freshwater systems to experience increasing episodes of hypoxia (low oxygen) of greater duration and intensity. Impacts on fish and fisheries have been difficult to quantify; direct observation has been challenged by a lack of long-term exposure indicators. This team has successfully refined the use of fish chemical biomarkers in fish otoliths (earstones) to directly assess lifetime hypoxia exposure in fishes. This project will those findings to look for additional biomarkers and models, to expand our understanding of how hypoxia affects fish and their food webs, contaminant transfers, and ecosystem services including economic impacts. The project includes a unique way of training students in science communication, posing the question: What forms of media and &quot;messaging strategies&quot; about deoxygenation are most effective at raising public awareness and understanding? Students are developing entries for PlanetForward's Storyfest, which is a contest to tell compelling stories to foster environmental understanding and solutions. Students from historically underrepresented, economically disadvantaged backgrounds are particularly sought out to participate. The investigators will engage with regional, national, and international management agencies and other relevant stakeholder groups to share information.&lt;/p&gt;
&lt;p&gt;This project encompasses a novel, linked set of interdisciplinary studies of food webs, and ecosystem services assessment. The thematic questions explored in this project are: 1. How does hypoxia alter habitat use for fishes? 2. How does hypoxia-altered habitat use and habitat productivity change food webs? 3. How does hypoxia affect/enhance trophic transfer of methylmercury? 4. How do hypoxia-induced changes in food webs affect aquatic ecosystem services? The set of linked studies will employ chemical analyses of otoliths and eye lenses, combined with chemical analyses of muscle tissues (Questions 1 and 3), physiologically-structured food web modeling informed by monitoring time-series (Questions 2 and 4), and a scoping workshop to address ecosystem services (Question 4). The investigators are using a &quot;trans-basin&quot; comparative approach to system-specific responses, studying fishes in Lake Erie, the Baltic Sea, and a Gulf of Mexico estuary. They study three species from each system that represent different degrees of benthic reliance, to discern differential responses to the increasingly hypoxic environment. This research provides novel insight about variable biotic responses to oxygen loss and the impacts on ecosystem functioning.&lt;/p&gt;</gco:CharacterString>
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	Description: &lt;p&gt;Unique identifier number for each individual fish included in the project. IDs include a prefix of &amp;quot;MB&amp;quot; (Matagorda Bay) or &amp;quot;PB&amp;quot; (Project Breathless) followed by a unique sequence of digits.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962752.rdf
	Name: Species
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	Description: &lt;p&gt;Latin binomial (Genus species) of each individual collected&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962753.rdf
	Name: Time
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	Description: &lt;p&gt;Time in seconds of laser traversal across one side of the eye lens to the other in a palindromic sequence&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962754.rdf
	Name: Li7
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Lithium isotope 7&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962755.rdf
	Name: B11
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Boron isotope 11&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962756.rdf
	Name: Mg25
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Magnesium isotope 25&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962757.rdf
	Name: S32
	Units: parts per million (ppm)
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http://lod.bco-dmo.org/id/dataset-parameter/962758.rdf
	Name: S34
	Units: parts per million (ppm)
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http://lod.bco-dmo.org/id/dataset-parameter/962759.rdf
	Name: Ca43
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Calcium isotope 43&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962760.rdf
	Name: Mn55
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Manganese isotope 55&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962761.rdf
	Name: Cu63
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Copper isotope 63&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962762.rdf
	Name: Zn66
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Zinc isotope 66&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962763.rdf
	Name: Se78
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Selenium isotope 78&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962764.rdf
	Name: Sr88
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Strontium isotope 88&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962765.rdf
	Name: Hg199
	Units: parts per million (ppm)
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http://lod.bco-dmo.org/id/dataset-parameter/962766.rdf
	Name: Hg202
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Mercury isotope 202&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962767.rdf
	Name: Pb208
	Units: parts per million (ppm)
	Description: &lt;p&gt;Concentration of Lead isotope 208&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962768.rdf
	Name: Station_Latitude
	Units: decimal degrees
	Description: &lt;p&gt;Collection location latitude in decimal degrees; positive values = North&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/962769.rdf
	Name: Station_Longitude
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	Description: &lt;p&gt;Collection location longitude in decimal degrees; negative values = West&lt;/p&gt; 
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