Some Animals Are More Equal than Others: Keystone Species and Trophic Cascades by Mrs Snyder https://padlet.com/bnsnyder/keystonespecies1 https://www.hhmi.org/biointeractive/some-animals-are-more-equal-than-others-keystone-species-and-trophic-cascades en-us 2018-05-02 18:11:12 UTC 2025-11-30 18:22:41 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rocket.png 1.) Do you agree or disagree with the following statement "All members of a food web are equal in abundance and in their relative effects on one another ."? Why or why not? bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257390582 2018-05-02 18:15:14 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257390582 2.) Do you agree or disagree with the following " Every member of a food web is the prey of another member of the food web. _______"? Explain. bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257391153 2018-05-02 18:16:23 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257391153 3.) Why were the mussels in Mukkaw Bay were able to quickly cover the rockface in Paine’s experiment? bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257393968 2018-05-02 18:21:34 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257393968 4.) In the film, Paine recalls that a year after the starfish had been removed, the number of species decreased from 15 to eight, after three years the number went down to seven, and after another seven years it was almost all only mussels. In the control plots the number and diversity of species was basically unchanged. Why? bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257394327 2018-05-02 18:22:12 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257394327 6.) Before the 1960s, most ecologists thought that the number of producers in an ecosystem was the only variable that limits the number of herbivores. The idea was that every level was regulated by the amount offood from the trophic level below it.a. How did the green world hypothesis differ from this “bottom-up” view? bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257402002 2018-05-02 18:37:19 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257402002 7.) Imagine a simple food chain: Grass -> Grasshoppers -> Mice. If snakes that eat mice are added to the ecosystem, would you expect the amount of grass to increase or decrease? Explain yourreasoning bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257403333 2018-05-02 18:40:11 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257403333 bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257404665 2018-05-02 18:43:00 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257404665 5.) In 1997, which species is the apex predator in the food chain? bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257406076 2018-05-02 18:45:56 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257406076 8.) Complete the following sentence. Figure 1 illustrates that when orcas started eating sea otters, the sea otterpopulation ___________________, the urchin population ______________________, and the kelppopulation _____________________________. bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257407167 2018-05-02 18:47:54 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257407167 9.) The arrows on the left and right sides of Figure 1 show the effects of one species on the species that are onlower trophic levels. Thicker arrows indicate a large effect and thin arrows a smaller effect. The arrows onthe left show a system in which there are a lot of sea otters. The arrows on the right show a system in whichthere are few otters. Explain why the down-pointing arrows on the left side of the figure look different fromthe arrows on the right side of the figure. bnsnyder https://padlet.com/bnsnyder/keystonespecies1/wish/257407731 2018-05-02 18:49:12 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/257407731 https://padlet.com/bnsnyder/keystonespecies1/wish/631312454 2020-06-17 23:19:42 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/631312454 https://padlet.com/bnsnyder/keystonespecies1/wish/631312514 2020-06-17 23:19:47 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/631312514 https://padlet.com/bnsnyder/keystonespecies1/wish/808211159 2020-10-06 19:41:30 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/808211159 https://padlet.com/bnsnyder/keystonespecies1/wish/808212128 2020-10-06 19:41:50 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/808212128 https://padlet.com/bnsnyder/keystonespecies1/wish/808212137 2020-10-06 19:41:51 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/808212137 https://padlet.com/bnsnyder/keystonespecies1/wish/826573362 2020-10-13 20:24:23 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/826573362 https://padlet.com/bnsnyder/keystonespecies1/wish/1217359447 2021-02-18 23:11:50 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/1217359447 https://padlet.com/bnsnyder/keystonespecies1/wish/1397249811 2021-04-08 18:35:30 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/1397249811 kjhh https://padlet.com/bnsnyder/keystonespecies1/wish/2887635995 2024-02-19 04:35:58 UTC https://padlet.com/bnsnyder/keystonespecies1/wish/2887635995