Navigation Links
Lake Erie hypoxic zone doesn't affect all fish the same, study finds
Date:1/10/2011

WEST LAFAYETTE, Ind. - Large hypoxic zones low in oxygen long have been thought to have negative influences on aquatic life, but a Purdue University study shows that while these so-called dead zones have an adverse affect, not all species are impacted equally.

Tomas Höök, an assistant professor of forestry and natural resources, and former Purdue postdoctoral researcher Kristen Arend used output from a model to estimate how much dissolved oxygen was present in Lake Erie's hypoxic zone each day from 1987 to 2005. That information was compared with biological information for four fish species to assess the hypoxic zone's impact on the sustainability of their habitats.

"The term 'dead zone' sounds really scary," Höök said. "But in a lot of cases a hypoxic zone will not be negative for all fish species."

Lake Erie's hypoxic zone is very large - about the size of Rhode Island and Delaware combined. And while the Gulf of Mexico's dead zone has received more attention, during some years Lake Erie's zone may be greater in volume.

Hypoxia occurs when water has less than two parts per million of dissolved oxygen. Discharge of nutrients, such as nitrogen and phosphorus, leads to excess algae growth. When that algae settles to the bottom and decomposes, oxygen is consumed.

The team's findings, published in the Journal of Freshwater Biology, showed that hypoxia negatively affected habitat quality for all species, but to varying degrees. Yellow perch, for example, saw little decrease, while round goby and rainbow smelt were more significantly affected.

Despite a more positive outlook for habitats of some species, Höök said it's still unclear how the organisms themselves were affected.

"Invertebrates that are stuck on the bottom of the lake and can't tolerate a lack of oxygen will die," Höök said. "But other organisms may be able to tolerate lower levels of oxygen, move up in the water column or even benefit from increased algae growth, which could lead to more invertebrate prey for fish."

Höök used observed climatic conditions and U.S. Environmental Protection Agency data to estimate daily temperatures and oxygen levels at varying depths over 18 years. Then, researchers used bioenergetic models, which use data about each species' needs in order to survive, to determine when and at what depth fish species' habitats were affected by hypoxia.

Höök said more work is needed to understand the organisms' responses to changes in habitat quality. His research group is developing more complex models to see how hypoxia-induced movements by fish may affect predator-prey relationships and other issues related to hypoxia.


'/>"/>

Contact: Brian Wallheimer
bwallhei@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert  

Related biology news :

1. Growing hypoxic zones reduce habitat for billfish and tuna
2. Experimental treatment halts hypoxic-ischemic brain injury in newborns
3. Parents social problems affect their children -- even in birds
4. Study shows caffeine negatively affects children
5. Babies biological clocks dramatically affected by birth light cycle
6. Pattern of drinking affects the relation of alcohol intake to coronary heart disease
7. Perinatal bisphenol-A exposure may affect fertility
8. Microsensors offer first look at whether cell mass affects growth rate
9. Volcanic eruptions affect rainfall over Asian monsoon region
10. Research proves gender-bending chemicals affect reproduction
11. Shifting forms: Penn study shows how variations of same protein affect immune response
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Lake Erie hypoxic zone doesn't affect all fish the same, study finds
(Date:4/11/2017)... , April 11, 2017 Crossmatch®, ... secure authentication solutions, today announced that it has ... Advanced Research Projects Activity (IARPA) to develop next-generation ... program. "Innovation has been a driving ... Thor program will allow us to innovate and ...
(Date:4/11/2017)... , April 11, 2017 No ... but researchers at the New York University Tandon ... of Engineering have found that partial similarities between ... systems used in mobile phones and other electronic ... The vulnerability lies in the fact ...
(Date:4/6/2017)... 6, 2017 Forecasts by Product ... Readers, by End-Use (Transportation & Logistics, Government & Public ... & Fossil Generation Facility, Nuclear Power), Industrial, Retail, Business ... Are you looking for a definitive report on ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... BALTIMORE, Md. (PRWEB) , ... October 11, 2017 ... ... for digital pathology, announced today it will be hosting a Webinar titled, “Pathology ... of  Advanced Pathology Associates , on digital pathology adoption best practices and how ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... and pregnancy rates in frozen and fresh in vitro fertilization (IVF) ... maternal age to IVF success. , After comparing the results from the fresh ...
(Date:10/10/2017)... ... October 10, 2017 , ... For ... has won a US2020 STEM Mentoring Award. Representatives of the FirstHand program travelled ... Volunteer Experience from US2020. , US2020’s mission is to change the trajectory of ...
(Date:10/10/2017)... ... October 10, 2017 , ... USDM Life Sciences , ... life sciences and healthcare industries, announces a presentation by Subbu Viswanathan and Jennifer ... “Automating GxP Validation for Agile Cloud Platforms,” will present a revolutionary approach to ...
Breaking Biology Technology: