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Research & Collections Photo Gallery

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Delaware River Watershed Initative

  • Two scientists in leafy Cobbs Creek. Photo by Tess Hooper
    Academy scientists sample algae on Cobbs Creek near Bethlehem, Pa., as part of the Delaware River Watershed Initiative.
    Credit: Tess Hooper
  • Horse farm at stream. Photo by ANS
    Farm fertilizers and animal waste flowing into streams can cause problems in the Delaware River Watershed.
    Credit: ANS
  • Scientist with measuring tape
    Academy Research Technician Amanda Chan and Staff Scientist II Sylvan Klein conduct a habitat assessment for a salamander biological survey of the Lehigh River near East Stroudsburg, Pa. Salamanders are key indicators of water quality.
    Credit: Nikita Shah/ANS
  • Measuring stream depth
    Drexel University co-op student Nikita Shah evaluates habitat conditions of a stream in the Poconos, Pa., for potential sampling as part of the Delaware River Watershed Initiative.
    Credit: Meg O’Donnell/ANS
  • Collecting fish in stream
    Academy scientists return to Cobbs Creek near Havertown, Pa., every other year to monitor fish populations and species abundance for a long-term survey. Here they are electrofishing to capture and then release fish.
    Credit: Sylvan Klein/ANS

  • Dr. Marina Potapova collects diatoms, single-celled algae.
    Credit: ANSP

  • Dr. Clyde Goulden interviews nomadic herders in Monglia who are affected by climate change.
    Credit: Tuya Goulden
  •  Fisheries scientist David Keller examines a fish for environmental toxins.
    Credit: Bruce Tepper/ANSP


  • Dr. Nate Rice showing a hummingbird specimen from the Ornithology collection to visiting students.
    Credit: Dennis Murphy/ANSP



  • Entomologist Isabelle Betancourt with a cicada specimen from the Academy’s world-renowned Entomology Collection of about 4 million specimens.
    Credit: ANSP