How does disease affect biodiversity?

Several studies suggest that with the loss of biodiversity the transmission of diseases increases (Keesing et al. 2010). Thus biodiversity loss causes the loss of an important ecosystem service: buffering the spreading of infectious diseases to humans, animals and plants (Pongsiri et al. 2009).

What are the 3 scales of biodiversity?

Usually three levels of biodiversity are discussed—genetic, species, and ecosystem diversity.

How do diseases affect the ecosystem?

An ecosystem with lots of variation (genetic diversity and diversity of species) is more resilient to the impacts of disease because there are greater possibilities that some species have evolved resistance, or if a species is lost, there will likely be another species to fill the niche of an extinct species.

What are the local human causes of biodiversity loss?

Biodiversity loss is caused by five primary drivers: habitat loss, invasive species, overexploitation (extreme hunting and fishing pressure), pollution, climate change associated with global warming. In each case, human beings and their activities play direct roles.

How does biodiversity prevent disease?

“Biodiversity permits the existence of a wide range of microbes. Most provide benefits to hosts and ecosystems. It is because of anthropogenic activities and practices that humans are coming in more frequent contact with natural reservoirs of microbes, of which some are potential pathogens deadly to humans.”

How does biodiversity loss affect the spread of infectious diseases?

Wildlife hosts represent both habitat and resources for infectious disease agents; therefore, if biodiversity loss causes a reduction in host abundance, these disease agents may decline alongside their hosts.

What are scales of biodiversity?

Whittaker (1972) described three terms for measuring biodiversity over spatial scales: alpha, beta, and gamma diversity. Alpha diversity refers to the diversity within a particular area or ecosystem, and is usually expressed by the number of species (i.e., species richness) in that ecosystem.

Which is the largest scale of biodiversity?

Ecological diversity
Ecological diversity is the largest scale of biodiversity, and within each ecosystem, there is a great deal of both species and genetic diversity.

How does biodiversity reduce disease?

Two decades ago, we proposed that innate biodiversity can reduce the risk of infectious diseases through a dilution effect, in which species in diverse communities dilute the impact of host species that thrive when diversity declines (43).

What are two different scales on which biodiversity can be measured?

Biodiversity can be measured at many different levels including genetic, species, community, and ecosystem. One way to measure biodiversity is to assess species richness of an ecosystem, which is the total number of distinct species within a local community.