What does the intermediate disturbance hypothesis suggest?
The intermediate disturbance hypothesis predicts that the highest diversity will occur at levels of moderate disturbance. We measured the species diversity, abundance, and species diversity of bacteria on the human body in relation to disturbance by washing.
Why is the rocky intertidal considered a particularly harsh place to live?
The rocky shore habitat is a hard place to live. Plants and animals here are adapted to the frequent changes in water chemistry, temperature and oxygen and pounding of waves on the rocks. Organisms must cling to the rocks or wash away on the tides.
What is Simpson’s index of diversity for this rocky shore community?
Simpson’s diversity index ranges between 0 and almost 1 (1 − S −1), is robust, and has a low bias toward the abundance distribution and sample size (Krebs 1999).
What is rocky intertidal zone?
The intertidal zone is the area where the ocean meets the land between high and low tides. A tide pool within Monterey Bay National Marine Sanctuary. Intertidal zones exist anywhere the ocean meets the land, from steep, rocky ledges to long, sloping sandy beaches and mudflats that can extend for hundreds of meters.
What is the intermediate disturbance hypothesis give an example of a disturbance event and explain the effect it has on the community?
The intermediate disturbance hypothesis states that moderate levels of disturbance can create conditions that foster greater species diversity than low or high levels of disturbance. For example, different frequencies of flooding affect the richness of invertebrate taxa living in beds of streams.
What is the intermediate disturbance hypothesis quizlet?
The intermediate disturbance hypothesis (IDH) suggests that local species diversity is maximized when ecological disturbance is neither too rare nor too frequent. At high levels of disturbance, due to frequent forest fires or human impacts like deforestation, all species are at risk of going extinct.
Where is rocky intertidal zone?
The rocky shores that lie at the edge of the ocean, between the high and low tides, are called the rocky intertidal. Rocky intertidal areas along the west coast of North America are some of the richest and most diverse places in the world.
What are the zones of the rocky shore?
Another type of rocky shore classification is based on two primary divisions, rocky intertidal and rocky subtidal ecosystems. The rocky intertidal ecosystem can be divided into four zones: the splash zone, high intertidal, middle intertidal, and low intertidal (Ricketts et al., 1985).
Which zone is more diverse?
The middle tide zone is submerged and exposed for equal amounts of time. The low tide zone is only exposed during low tide and has the greatest biodiversity of the three zones because it provides more favorable conditions for those organisms that cannot tolerate air exposure for long.
What is zonation rocky shore?
Department of Conservation Marine Reserves Education Kit. ZONATION ON TERRACED ROCKY FLOORS. The extracts describing the structure and biology of the shores at Goat. Island Bay and Long Bay are taken from: Margins of the Sea – exploring New Zealand’s coastline.
What are the three zones of the rocky intertidal?
The intertidal zone can be further divided into three zones: high tide, middle tide, and low tide.
Why do moderate levels of disturbance such as a forest fire results in an increase in community diversity?
According to IDH theory, at intermediate levels of disturbance, diversity is thus maximized because species that thrive at both early and late successional stages can coexist. Second, interspecific competition results from one species driving a competitor to extinction and becoming dominant in the ecosystem.