Raquel Romero Bio12 Variety of life forms within a given ecosystem - PowerPoint PPT Presentation

Raquel Romero Bio12

� Variety of life forms within a given ecosystem � measure of health of biological systems � Healthy natural environments provide the basics of life

� Biodiversity Biodiversity Biodiversity provides Biodiversity � ecosystem goods and The river’s fish help maintain The river’s fish help maintain services: its ecological balance! its ecological balance! Food and water o Flood and disease control o Shelter and medicines o � Saw Mill River is Yonkers backup water source � Local recreational concern

� 1/65 Tributaries of the Hudson River � ~20 miles long � Flows from Chappaqua to Yonkers, N.Y. � Source: Source: Town of Source: Source: � New Castle � Mouth: Mouth: Mouth: Dock street, Mouth: � Hudson River

� “Great Fishing Trap” � 1903, Yonkers drew drinking water from the river and residents swam and fished in it � Although the river has not been used for drinking water since 1983, it is still a backup water source for the city.

Seine for Fish along the Saw Mill River, in order to create a thorough analysis of species that exist there

� SITES: � Fish biologist Antonios � Chappaqua Pappantoniou � Pleasantville � Ten sampling sites � Thornwood � April to August 1989 � East View � Sites sampled 2-4 times each � Ardsley � Collected 1967 � Elmsford specimens � Woodlands Lake � 22 species � Odell Ave( near ext blvd.) � Nepperhan Ave � Dock Street

� The Journal News “Saw Mill River health is called no fish story” � Biologist Pappantoniou & Saunders H.S. students � 11 sites � 16 species � (6 fewer species than 1989 study)

� Seine in selected sites along Saw Mill River � Collect and identify fish species � Photograph and record species � Excel � Compare results to past studies

� 5x4 seine net 5x4 seine net � waders waders � Fish Dip nets Fish Dip nets � Buckets Buckets � Fish Identification key Fish Identification key � Camera Camera � Map Map � Glass fish observer Glass fish observer � volunteers volunteers

Chappa Chappaqua qua Hawthorne Hawthorne Elmsfor Elmsford Lawr Lawrence St. ence St. Manor Hous Manor House Executiv Executive Blvd. Blvd.

Seining net Kicking into net FISH

� Saunders HS students, � June 08, July 08, August o8, Lehman College, & Ground October08,April 09, May 09 works Hudson Valley � Sites Sites Sites: Sites � � 6 sites � Chappaqua � 2-11 times each � Hawthorne Cinema � 454 fish � Rum brook park, Elmsford � 8 species � Lawrence St. � Manor House � Executive Blvd.