Ecologia - Aula 14 - Conservação e restauração ecológicas

Conservation and Ecological Restoration

Importance of Biodiversity Protection

• The discussion emphasizes the growing global recognition of the need to protect biological diversity, driven by human impact on ecosystems.

• International agreements and documents have been established to define strategies for biodiversity protection, highlighting collaborative efforts among nations.

Convention on Biological Diversity (CBD)

• The CBD outlines three main objectives: conservation of biological diversity, sustainable use of its components, and fair sharing of benefits derived from genetic resources.

• Established during the Earth Summit in 1992 and enacted in 1993, the CBD provides a framework for global biodiversity conservation strategies.

Conservation Strategies

Ex Situ Conservation

• One strategy is ex situ conservation, which involves preserving biological diversity outside natural habitats through methods like seed banks and cryopreservation.

• This approach ensures that species with agricultural significance, such as coffee varieties, are maintained for future generations.

In Situ Conservation

• In situ conservation focuses on protecting ecosystems and natural habitats where viable populations exist while also considering domesticated species within their historical contexts.

• It emphasizes maintaining species in their original environments to preserve their unique characteristics developed over time through cultivation practices.

On-Farm Conservation

• On-farm conservation complements in situ efforts by safeguarding wild genetic resources within their natural habitats while promoting traditional knowledge related to plant domestication.

• Examples include maize originating from Mexico but cultivated across Africa, showcasing the importance of conserving diverse genetic variations globally.

Techniques for Plant Conservation

In Vitro Techniques

• Various techniques such as in vitro culture allow for the preservation and manipulation of plant tissues for genetic improvement purposes. Key materials preserved include roots, pollen grains, embryos, and buds.

Micropropagation

• Micropropagation is highlighted as a primary technique used to create tissue cultures that can be stored for future use in plant breeding programs or restoration projects.

Cryopreservation

• Cryopreservation involves freezing biological material at extremely low temperatures to maintain cellular integrity over long periods while also eradicating pathogens present in plant tissues. This method is cost-effective but requires specialized equipment like liquid nitrogen tanks to achieve necessary temperatures below -200°C.

Role of Botanical Gardens

Jardins Botânicos e Conservação

Importância dos Jardins Botânicos

• Os jardins botânicos têm fins científicos, com plantas destinadas à pesquisa e uso econômico, refletindo a diversidade de aproximadamente 30 jardins no Brasil.

Categorias de Jardins Botânicos

• Existem várias categorias de jardins botânicos, incluindo coleções de árvores nativas e exóticas, como os "boletos", que são misturas dessas espécies.

Tipos Específicos de Jardins

• Os jardins ornamentais, como os japoneses, focam em espécies decorativas. Há também jardins combinados com zoológicos para conservação ex situ de plantas e animais.

Estratégias de Conservação

• A conservação in situ envolve técnicas para preservar parentes silvestres das plantas cultivadas, visando manter a variabilidade genética ainda não domesticada pelo homem.

Exemplos Práticos

• O exemplo da batata na Bolívia ilustra a riqueza genética disponível em parentes silvestres. O milho também possui diversas espécies originárias do México que são consumidas após domesticação.

Melhoramento Genético e Sustentabilidade

Vantagens dos Parentes Silvestres

• Utilizar parentes silvestres permite recuperar características genéticas perdidas em cultivares melhoradas, promovendo sustentabilidade nas práticas agrícolas.

Técnicas In Situ para Conservação

• A criação de áreas protegidas é uma técnica essencial que depende da ação governamental para garantir a preservação e o uso sustentável dos recursos naturais no Brasil.

Classificação das Áreas Protegidas

• As áreas protegidas podem ser divididas em áreas de proteção integral (acesso restrito ao homem) e áreas de uso sustentável (onde o ser humano pode viver se usar recursos naturalmente).

Restauração Ecológica: Conceitos e Práticas

Objetivos da Restauração Ecológica

• A restauração ecológica busca recuperar ecossistemas fragmentados devido à atividade humana, como exemplificado pela recuperação do Pontal do Paranapanema.

Corredores Ecológicos

• Um corredor reflorestado foi criado entre duas áreas naturais separadas por pastagens, permitindo fluxo biológico entre elas e ajudando na conservação da fauna local.

Definição de Restaurar

• O conceito de restaurar implica reparar ou reintegrar algo ao seu estado primitivo. Um exemplo notável é a restauração dos afrescos da Capela Sistina nos anos 70.

Desafios na Restauração

Complexidade do Processo Restaurativo

Restoration of Ecosystems: Theory and Practice

The Challenges of Restoration

• A Spanish chapel restoration case illustrates the importance of professional input, goal setting, and historical context in restoration efforts. Without these elements, expectations may not be met.

• The failure to achieve desired outcomes in restoration can lead to unintended results, as seen when a painting was altered instead of restored properly.

Complexity of Ecological Restoration

• Restoring ecosystems is complex due to the need for precise identification of degraded components and ensuring their proper interaction within the ecosystem.

• Effective ecological restoration requires both theoretical knowledge and practical application, emphasizing the interplay between science and hands-on work.

Theoretical Foundations

• Restoration ecology provides a scientific framework that supports rigorous methods for restoring ecosystems while validating theories through practical applications.

• This field serves as an experimental ground for applying ecological theories aimed at restoring ecological productivity and interactions among biotic and abiotic factors.

Human Values in Restoration

• Successful restoration also involves addressing human values—social, cultural, economic, and ethical—while reinstating environmental services.

• Understanding the connection between theory and practice is crucial; it presents challenges in linking predictive models with real-world applications in ecosystem management.

Evolution of Restoration Concepts

• Historically, definitions of restoration have evolved from recovering entire communities to more realistic processes that assist degraded ecosystems' recovery.

• Current definitions emphasize returning ecosystems to altered states rather than attempting unrealistic full recoveries.

Key Definitions by Pioneers

• Anthony Brad Chantel's definition highlights that restoration involves assisting both biotic and abiotic components towards achieving a natural state while considering various ecological concepts like rehabilitation.

Ecological Restoration Concepts

Understanding Ecological Degradation and Restoration

• The ecosystem faces degradation, which can be addressed through assisted regeneration by selectively including or excluding species in restoration planting to enhance the regeneration process.

• In passive restoration, human intervention is minimal; the focus is on removing disturbances from degraded environments to allow natural regeneration processes to occur.

• Rehabilitation is a distinct concept within ecological restoration aimed at recovering certain aspects of an ecosystem without necessarily restoring it to its original state, focusing instead on re-establishing some functional and structural elements.

Different Approaches to Ecosystem Recovery

• Substitution involves creating new ecosystems that differ significantly from the original ones, aiming for environmental services that diverge from those of the restored ecosystem.

• For example, in areas where ecological restoration isn't feasible, one might plant eucalyptus for carbon capture and biomass production or establish arboreta with exotic species as alternative solutions.

Factors Influencing Restoration Success

• Various factors influence the success of ecological restoration efforts; understanding these factors is crucial for effective implementation.

• The degree of degradation depends on multiple variables such as magnitude, frequency, duration, and type of disturbance affecting the ecosystem.

• A reference ecosystem serves as a model for restoration efforts; its viability is essential since an unviable reference cannot support successful restoration outcomes.

Importance of Professional Valuation in Restoration

• Professionals involved must ensure ongoing maintenance and ecological integrity throughout the recovery process to achieve sustainable results.

Conservation Strategies Overview

• Today's discussion highlighted global strategies focused on biodiversity conservation across various scales and purposes beyond merely protecting native species or threatened ecosystems.

• Understanding concepts like ecological restoration and conservation is vital for implementing concrete actions aimed at preserving ecosystems effectively.