Navigation Links
Tiny fish can yield big clues to Delaware River health
Date:11/13/2007

PHILADELPHIA Where have all the bridle shiner gone" Thats the mystery The Academy of Natural Sciences fish scientists are trying to answer, and the outcome will shed light on the environmental health of the Upper Delaware River.

Bridle shinernot easy to spot at less than two inches longonce were abundant in the mid-Atlantic region, including small streams in Southeastern Pennsylvania. Their steady decline has prompted Pennsylvania to classify the fish as endangered. Now, the Academy is swimming the tide to lay the groundwork for an environmental management plan for the species and its habitat.

The Academys Patrick Center for Environmental Research, in partnership with the Upper Delaware Scenic and Recreational River and the Delaware Water Gap National Recreation Area, is in the midst of a two-year project to discover and describe the status of the little minnow in the Upper Delaware River basin. Academy fisheries scientists David Keller and Shane Moser, under the direction of Dr. Richard Horwitz, have cast their seine nets and gone snorkeling many times at various locations over the last year with varying results. Their findings will shed light on the health of the Upper Delaware River and will factor into decisions made about the flow of the river.

The presence and absence of fish helps us define preferred habitat for the fish, which helps us locate potential sites for sampling, explained Horwitz. We've located several sites with populations of the species, and in other places we've found a few fish on one visit, but not on subsequent visits. These sites may lead us to sites with large populations.

Academy studies reveal possible causes of the species decline may include changes in water quality due to siltation, nutrient enrichment and changes in flow patterns, and the introduction of predators, such as largemouth bass, as well as competitors for food. Interestingly, a decline in the beaver population also may factor into the decline.

Weve found bridle shiner in ponds formed by beaver activity, said Horwitz. Beaver were once extirpated or nearly extirpated in the region. Beaver have become re-established and numbers have been increasing, which may provide new habitats for the bridle shiner.

The results of the Academys studies, which will continue into 2008, will factor into the Delaware River Basin Commissions flow management plans for the river. Bridle shiner prefer slow-moving, shallow waters that flow over beds of aquatic plants. The Upper Delaware River region provides drinking water, supports a number of native fish species, and is popular for sport fishing and other recreational activities. Flow management can affect all these resources; in addition, flooding is a concern in some riverside communities.

Our goal is to develop management plans to protect the fish and its habitat, said Horwitz. Water flow and temperature in the Upper Delaware Rivers backwater habitats are key to doing this.

The historical status of bridle shiner in Pennsylvania is known mostly from early 20thcentury collections held at the Academy. The species was originally described by naturalist Edward Drinker Cope, who discovered the fish in a tributary of the Schuylkill River in Conshohocken, Pa., where it no longer occurs. Copes personal collection of fishes, reptiles and amphibians was bequeathed to the Academy in 1898.


'/>"/>

Contact: Carolyn Belardo
belardo@ansp.org
215-299-1043
The Academy of Natural Sciences  
Source:Eurekalert

Related biology news :

1. Layered approach may yield stronger, more successful bone implants
2. Fungus genome yielding answers to protect grains, people and animals
3. Study begins to reveal clues to the cause and progression of sepsis
4. Chlamy genome holds clues for renewable energy, the environment and human health
5. How schizophrenia develops: Major clues discovered
6. Baiji Dolphin previously thought extinct spotted in the Yangtze River
7. UC Riverside biologist receives prestigious MacArthur Fellowship
8. International team of scientists warns of climate changes impact on global river flow
9. Stronger EPA leadership needed to improve water quality in Mississippi River
10. UC-Riverside partners with Chinese university to address Chinas environmental problems
11. X-effect: female chromosome confirmed a prime driver of speciation
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Tiny fish can yield big clues to Delaware River health
(Date:12/2/2016)... , December 1, 2016 ... type (Fingerprint, Voice), Future Technology (Iris Recognition System), ... Region - Global Forecast to 2021", published by ... 442.7 Million in 2016, and is projected to ... a CAGR of 14.06%.      (Logo: ...
(Date:11/30/2016)... CHICAGO , Nov. 30, 2016  higi ... a new partnership initiative targeting national brands, industry ... and reward their respective audiences for taking steps ... Since its inception in 2012, higi has built ... US, impacting over 38 million people who have ...
(Date:11/29/2016)... CANNES, France , November 29, 2016 Nearly ... Continue Reading ... ... System is part of an efficient Identity Management. (PRNewsFoto/DERMALOG Identification Systems) ... DERMALOG is Germany's largest Multi-Biometric ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... BELLINGHAM, Washington, USA, and CARDIFF, UK (PRWEB) , ... ... ... neural circuits with very high precision light to control cells — optogenetics — ... brain. In the current state of the art, spatially patterned light projected via ...
(Date:12/8/2016)... Oxford Gene Technology ... Palette an anpassbaren SureSeq™ NGS-Panels mit dem Start ... ein schnelles und kostengünstiges Studium der Varianten bei ... Erkennung von Einzel-Nukleotid-Variationen (Single Nucleotide Variation, SNV) und ... Panel und ermöglicht eine individuelle Anpassung durch die ...
(Date:12/8/2016)... , Dec. 8, 2016  Anaconda BioMed S.L., a ... of the next generation neuro-thrombectomy system for the treatment ... Tudor G. Jovin, MD to join its Scientific Advisory ... a strategic network of scientific and clinical experts to ... of the ANCD BRAIN ® to its clinical ...
(Date:12/8/2016)... ... December 08, 2016 , ... ... exceptionally efficient human mesenchymal stem/stromal cell (hMSC) expansion medium. This single ... engineered to radically streamline culture processes, minimize processing time, significantly decrease production ...
Breaking Biology Technology: