BLUE CRABS: THE STRUGGLE FOR LIFE KELLY CORREIA. WHY ARE BLUE CRABS IMPORTANT? IMPORTANT FOR FISHERMAN– THEY’RE DELICIOUS! THEY FEED ON ALMOST ANYTHING.

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Presentation transcript:

BLUE CRABS: THE STRUGGLE FOR LIFE KELLY CORREIA

WHY ARE BLUE CRABS IMPORTANT? IMPORTANT FOR FISHERMAN– THEY’RE DELICIOUS! THEY FEED ON ALMOST ANYTHING THEY CAN GET HOLD OF, INCLUDING MUSSELS, SNAILS, FISH, PLANTS, DEAD ANIMALS AND EVEN… OTHER BLUE CRABS! THOSE CANNIBALS! THEY EAT THINGS THAT MOST ANIMALS WILL NOT EAT. THEY HELP TO MANAGE OTHER POPULATIONS SO THAT MORE SPECIES CAN COEXIST

WHERE DO CRABS LIVE? ESTUARIES! WHY ARE THEY IMPORTANT?? FILTER THE WATER LOTS OF NUTRIENTS PROVIDE HOMES FOR BABIES PROTECT THE COAST AND BEACHES REDUCE EROSION PROVIDE LOTS OF FISH Estuary = A semi-enclosed body of water between a river and the ocean om_balloon.jpg

HUMANS VS. CRABS way-for-healthy-summer-in-crab-populations/ marine-pollution/ pollution/

POLLUTION DEFINITION POINT VS. NON-POINT SOURCE POLLUTION POLLUTION CAN LEAD TO MASS FISH KILLS AND UNSANITARY WATER NO FISH  NO MONEY FOR FISHERMAN ESTUARIES HELP FILTER THE POLLUTION OUT OF THE WATER SO IT DOESN’T GO OUT TO SEA, BUT IT EFFECTS ORGANISMS LIKE CRABS IN THE PROCESS

EXPERIMENT QUESTION #1: IF A CRABS IS EXPOSED TO PESTICIDE MORE THAN ONCE, WILL THEY GET SICKER? HYPOTHESIS: CRABS WILL RESPOND NEGATIVELY TO MORE PESTICIDE. QUESTION#2: DO CRABS KNOW WHEN PESTICIDES ARE AROUND? HYPOTHESIS: CRABS WILL TRY TO AVOID AREAS WHEN PESTICIDES ARE PRESENT QUESTION #3: CAN CRABS FIND FOOD AND AVOID PREDATORS AFTER THEY ARE EXPOSED TO PESTICIDES? HYPOTHESIS: CRABS WILL NOT BE ABLE TO LOCATE THEY FOOD AND AVOID PREDATORS AFTER THEY ARE EXPOSED TO PESTICIDES.

PROCEDURE FLIPPED THE CRABS TO MEASURE ABILITY TO RESPOND AND REACT MEASURED TIME IT TOOK UNTIL THE CRAB WAS ABLE TO FLIP ITSELF BACK OVER. Exposed crab Normal crab

CAN CRABS SURVIVE ON BUG JUICE? CRABS WERE EXPOSED TO LOW, MEDIUM AND HIGH LEVELS OF PESTICIDES CONCLUSION: CRABS THAT ARE EXPOSED TO PESTICIDES TAKE LONGER TO FLIP THEMSELVES BACK OVER WHY DO WE CARE??? Blue bars are juvenile crabs Red bars are adult crabs

EXPERIMENT 2 WILL THEY SWIM AWAY FROM THE PESTICIDE??

EXPERIMENT 3 CAN THEY FIND THE FOOD AFTER THEY HAVE BEEN EXPOSED TO A PESTICIDE??

HOW CAN WE HELP??