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:4/5/2017)... , April 5, 2017 Today ... announcing that the server component of the HYPR platform ... for providing the end-to-end security architecture that empowers biometric ... HYPR has already secured over 15 million users ... including manufacturers of connected home product suites and physical ...
(Date:4/3/2017)... April 3, 2017  Data captured by ... platform, detected a statistically significant association between ... to treatment and objective response of cancer ... to predict whether cancer patients will respond ... as well as to improve both pre-infusion potency ...
(Date:3/30/2017)... -- Trends, opportunities and forecast in this market to ... AFIS, iris recognition, facial recognition, hand geometry, vein recognition, ... industry (government and law enforcement, commercial and retail, health ... and by region ( North America , ... , and the Rest of the World) ...
Breaking Biology News(10 mins):
(Date:6/20/2017)... , ... June 20, 2017 , ... ... immediately determine the adulterants which pose the most likely threat to their products ... of this year. , IFT's annual food expo attracts over 20,000 attendees ...
(Date:6/19/2017)... ... June 19, 2017 , ... As Vice President, ... products including training, implementation, support, and client process and SOP development. , Mr. ... previously held leadership roles for service providers and top-tier pharmaceuticals, and as an ...
(Date:6/16/2017)... ... June 16, 2017 , ... ... analytics solutions, today announced that its Anzo Smart Data Lake® (Anzo SDL) ... Solution’ category for the 2017 Software & Information Industry Association (SIIA) CODiE Awards. ...
(Date:6/15/2017)... ... June 15, 2017 , ... ... promising new medical device startup. Dan Parsley, angelMD’s SVP of Corporate Development, served ... and this angelMD syndicate is part of Saranas’ recently announced $4 million Series ...
Breaking Biology Technology: