Chapter 11: Biodiversity Preserving Species

Relocation of Wolves
- 31 wolves relocated from Canada to Yellowstone in the mid-1990s.
- Current population estimated between 100 to 150 wolves, organized into 11 different packs.
Ecological Impact
- Healthy population regulating elk numbers.
- Preventing overgrazing of stream banks by elk, which now avoid dangerous areas.
Biodiversity Recovery
- Return of various bird species due to healthier trees and reduced overbrowsing by elk.
- Increased populations of small mammals and the return of beavers constructing dams that support other wildlife.
- Wolves categorized as a keystone species - essential for maintaining the ecological equilibrium.
- Yellowstone approaching its original state before human interference due to wolf reintroduction.

Public Perception
- Wolves viewed positively by many for their ecological role and beauty.
- Seen as a part of indigenous culture.
- Controversial presence near livestock—sheep farmers and pet owners concerned about predation.
Challenges in Endangered Species Recovery
- Some endangered species receive attention based on their charisma (e.g., wolves vs. less appealing species).

Definition of Biodiversity
- Species diversity: number of species in a specific area.
- Genetic diversity: variation within a species or population (e.g., low genetic diversity in East African cheetahs).
- Ecological diversity: variety of ecosystems within a region (e.g., ecological differences between Maryland and Puerto Rico).

Importance of defining a species to measure biodiversity.
Biological Species Concept
- Organisms that can successfully reproduce and produce viable offspring are the same species.
- Example: Horses and donkeys produce mules, which are sterile—proves they are different species.
- Cross-species reproduction can lead to ambiguities (e.g., coy dogs, growler bears).
Limitations of Biological Species Concept
- Inapplicability to extinct species and organisms that reproduce asexually.

Phylogenetic Species Concept
- Based on genetic data; groups organisms based on genetic similarities.
- Useful for asexual organisms and extinct species when fossils do not provide clear answers.
- Genetic clustering can help classify species accurately, regardless of reproductive capabilities.
Evolutionary Species Concept
- Combines elements of biological and phylogenetic concepts, focusing on common lineages and evolutionary relationships.
- Important for conservation, especially in classifying subspecies and identifying conservation priorities.

Approximately 1,700,000 species officially described worldwide.
Estimated total number of species (including undiscovered) is between 8 and 10 million.
Difficulty in discovery due to rarity, remote locations, and lack of interest in certain groups (e.g., soil bacteria).
Table in textbook summarizing species status across major groups: mammals, birds, insects.

Criteria for Hotspots
- Areas with at least 1,500 endemic species and lost at least 70% of their original habitat.
- Most hotspots located near the equator and coastal areas (e.g., islands like Madagascar).
- Example of endemic species: various salamanders in the Appalachian Mountains.

Importance of conserving biodiversity for human survival and well-being.
Ecosystem Services
- Wild plants (80,000 species estimated) contribute to food security, medicine, and ecological balance.
- Example: Madagascar periwinkle produces anticancer compounds.
Economic Implications
- Aesthetic and ecological values drive tourism, preserving places like Yellowstone.
- The existence value: many people believe in the inherent right of species to exist.

Background Rate of Extinction
- Natural extinction occurs to maintain ecological balance; however, current rates significantly higher (>500 years).
- Major causes: HIPPO (Habitat loss, Invasive species, Pollution, Population growth, Overharvesting).
HIPPO Explained
- Habitat Loss: Deforestation, urban development leading to fragmentation.
- Invasive Species: Barred owl affecting spotted owls; introduced plants and animals disrupt local ecosystems.
- Pollution: Persistent organic pollutants like DDT disrupting wildlife, leading to declines (e.g., bald eagles).
- Population Growth: Increasing human populations lead to more resource demands and pressures on habitats.
- Overharvesting: Historical example of the passenger pigeon; current concerns with bushmeat trade and illegal trade of wildlife products.

Legislative Actions
- The Endangered Species Act (ESA) in the US categorizes species as endangered, threatened, or vulnerable and mandates recovery plans.
- Local landowners involved in conservation efforts to protect endangered species while allowing for economic activity.
- Global initiatives (e.g., Convention on Biological Diversity, CITES) aimed at protecting endangered species internationally.
- Captive breeding programs for species like the California condor contributing to recovery efforts.

Eco-Friendly Practices
- Encourage leaving fallen leaves for habitat; reducing lawn mowing.
- Planting native gardens to support pollinators.
- Advocacy for conservation policies and awareness in local communities.
Community Initiatives
- Engage in gap analysis to identify biodiversity-rich areas needing protection.
- Support zoos and arboretums' conservation programs to enhance public awareness and recovery efforts.