Adaptations of animals on the rocky shore.. What could be affecting this environment???

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Presentation transcript:

Adaptations of animals on the rocky shore.

What could be affecting this environment???

Abiotic factors that influence distribution on the rocky shore. Salinity Temperature Moisture levels/ amount of time immersed by tide. Wind exposure Wave exposure Light intensity

Adaptations Adaptations are generally: Structural - eg. thick, impermeable shells to reduce water loss and radiation effects. Behavioural - eg. seeking small crevices for shelter to reduce the drying effects of the wind. Physiological - eg. an ability to lower metabolic rates during exposed periods to minimise oxygen consumption

Biotic factors that influence distribution on the rocky shore. Competition Predation Food availability

Bladder Kelp Need sunlight for photosynthesis. Strong attachment to rocks High demand for water Thick, tough leaves to cope with strong waves. Bladders for flotation

Neptunes Neclace Tough modified leaves. Air filled bladders to enable flotation. Strong attachments to rocks.

Chitons Very strong attachment to rocks- foot. Attachment avoids being washed off rocks/ picked off- predation Streamlined shape to prevent being washed off rocks

Limpets Very strong attachment to rocks- foot. Attachment avoids being washed off rocks/ picked off- predation Streamlined shape to prevent being washed off rocks Hard shell- protection from predation

Crabs Mobile- escape preds/ search out food. Modified leg into claw for protection and territorial displays. Streamlined shape to limit chances of being washed off rocks. Behavoiral adaptions- burrowing and living under rocks These help to avoid desiccation.

Hermit Crab Mobile- escape preds/ search out food. Modified leg into claw for protection and territorial displays. Streamlined shape to limit chances of being washed off rocks. Behavioural adaptations- burrowing and living under rocks Shell provides protection/ camoflague

Barnacles Strong attachment to rocks- glue Hard shell- protection from predators/ desiccation Free swimming larvae- distributed to reduce competition Ability to close up shell when tide is out to prevent dehydration.

Whelk Hard shell to avoid predation- eat barnacles. Mobile foot that can be retracted to avoid desiccation. Can close shell. Food must hold to rocks to avoid being washed off Sheltering behaviour

Snail (includes periwinkle) Hard shell Strong foot Ability to close up to avoid desiccation.

Mussles Strong attachment to rock- Bises hairs. Ability to open and close shell to avoid desiccation/ feed/ avoid predation. Free swimming larvae Cant withstand high temperatures