BANU QASI CARLOS ORENSANZ PDF
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Functional diversity on marine environments: Effect of four different pretreatments in anaerobic digestion and nutrient removal of effluents from a recirculating aquaculture system Edgar A. Evaluation of commercial diets on growth and its effect on muscle biochemical composition of juvenile Peruvian grunt, Anisotremus scapularis Tschudi, Familia: Use of the surf zone of sandy beaches by croaker s larvae Cynoscion spp. Reproductive aspects of Mugil curema Mugiliformes: Neochinorhynchidae xarlos on productive and economic performance of the tambaqui Colossoma macropomum Cuvier,reared in ponds.
Brazil has the most extensive and richest areas of coral reefs in the South Atlantic Ocean, with its fauna characterized by high endemism and adaptations related to its growth and morphology, to its coral building fauna and to the depositional environment carlso differ from other coral reefs around the world.
In orensannz of the effects from changes in the global environmental, the main stress factors for Brazilian reefs are local level threats, such as pollution and overfishing.
The effects from these threats reduce biodiversity and result in decreasing stocks at different trophic levels. The trend that currently exists, regarding marine resource use, implies that reassessing the conservation strategies is urgently necessary if the degradation of these environments is to be reversed.
It is necessary that the practices used in carloe watersheds be improved, combined with actions carlps protect and recover native vegetation, along with planning for developing coastal areas, carlod will ensure that sedimentation rates be controlled and pollution sources are drastically reduced.
Brazil should orsnsanz to adopt a multidisciplinary approach to lead an evolution from traditional threat management in individual portions of ecosystems to large-scale management strategies in complex socio-economic and natural systems.
Unregulated tourism, overfishing, uncontrolled coastal development, introduction of species and climate change are among the main human actions that are putting pressure on these ecosystems Wilkinson, Given the current global decline in biodiversity, it is urgently necessary that conservation strategies designed to develop initiatives aimed at reversing the course of ecological degradation in the oceans be reevaluated Fraschetti et al. The importance of healthy coral reefs is widely recognized; qaso importance includes the aesthetic, cultural and biological contribution coral reefs provide, in addition to their economic value to fisheries and tourism McCook et al.
However, coral reefs Corresponding editor: Cesar Lodeiros continue to suffer from oresanz human pressure in almost all areas of the world. There are pressures that act on the local scale that directly affect the surrounding populations and are caused by local phenomena e. Despite having a localized impact, these pressures are present everywhere, and only rare and remote coral reefs are spared of their impacts Wilkinson, Caglos addition to these pressures, the so-called global-scale pressures e.
The global reef crisis has mobilized a large number of authorities and scientists in an bbanu to better unders. Nevertheless, the main causative agents of the decline in coral reefs remain active and are globally distributed De ath et al.
Therefore, only with great effort, good planning and significant participation by society will a significant improvement in the management of coral reefs be achieved Sale, The main threats to the coral reefs in carls South Atlantic Ocean are presented in this study. The tools and management strategies that can be applied to reduce the impacts carloa these threats are orensqnz highlighted, while taking into account the existing regional particularities of the Brazilian coastline.
Goods and services from coral reefs Ecosystem services can generally be classified into the following categories: Maintaining these services depends on complex interactions in the seascape as a whole e. Despite the recognized importance of the goods and services that reef environments provide, until recently it was common for their resources to be exploited in a harmful way e. In addition, unregulated tourism Smallwood et al.
These reefs are located outside the Caribbean hurricane belt, on a stable continental shelf, and are not subject to natural carlow events such as those observed in the Indo-Pacific and Caribbean coral reefs. These reefs are found along Brazil s entire northeast coast Fig.
Brazilian reefs are fairly heterogeneous. On the North Coast, there are oceanic communities that are dominated by coralline algae, with Siderastrea stellata being the main coral builder. The Northeast Coast has long lines of reefs along its fringe coralline communities growing on the sandstone reefswith parallel lines on the outer portion.
This type of reef structure, which is typical for Brazil s East Coast, is not commonly found in other parts of the world. Brazil hosts a small number of shallow-water scleractinian coral species, with 18 to 21 species Laborel, ; Castro, ; Neves et al.
In contrast to most of the world s coral reefs, Brazilian coastal reefs are subject to high rates of siliciclastic sediment deposition, a result of river discharge and coastal erosion.
During cold front periods, this sediment is re-suspended by the increased energy of waves, which increases the turbidity and alters the amount of light energy that reaches the coral Segal et al.
The success of Brazilian coral under these conditions must be related to the fact that these resuspension events occur periodically, with corals growing in the interim periods. In addition, the prevalence of species with larger polyps and more effective mechanisms for removing sediment might reflect their ability to adapt to the high rates of turbidity in Brazilian waters.
Studies on the Brazilian reefs The first scientific reports on Brazil s coral reefs date back to the 19 th century and were the result of visits made by pioneering naturalists Darwin, ; Hartt, Branner provided continuity to these early.
Map of areas in which coral reefs are found along the Brazilian coastline. Rio Grande do Norte, PB: However, the first study to comprehensively cover the subject was performed in the s by French marine biologist Jacques Laborel. This study provided a qualitative and semi-quantitative description of Brazil s coral reefs located along much of its Northeast Coast, which is an important reference source for current studies Laborel, Over the past 15 years, broad and varied research efforts have been undertaken to gain a better understanding of the way coral reefs work, including their peculiarities and processes.
Despite the unprecedented number of studies on Brazilian reef systems, information from these is rarely used in practical decision making or included in implementing actions designed to ensure the resilience of these systems and protect them from these threats. Approximately more than half the world s population slightly more than 3.
A portion of this population is directly or indirectly engaged in activities related to tourism, fishing, oil and natural gas production, as well as services that meet the economic dynamic of the local area and its surroundings.
Many reef scientists assume that local factors predominate and that isolated reefs are generally healthier and more resilient. These suggest that local factors such as fishing and pollution are having minimal effects or that their impacts are masked by global drivers such as ocean warming. In Brazil, most of the pressure placed on reefs is related to the lack of any regulation regarding the use of natural resources and to uncontrolled coastal development.
The increasing human population and the subsequent demand for products and services have intensified the effects of threats to coral reefs.
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The following section will address the main coral reef threat vectors and their relationship with the growing human population that surrounds reef areas through an ecosystem approach. Unregulated tourism Among the main reasons why tourists are attracted prensanz Brazil is the country s coastal regions, which constitute an important development alternative MTur, However, the presence of a large number of tourists can be harmful, with the exception of a few locations that progressively regulate the regions and have the carlps infrastructure to do so Wilkinson, Globally, unregulated tourism is considered a cause of declining coral coverage, increased sedimentation, changes in local community structures, coral fragmentation, reduced coral growth and reproduction rates e.
More detailed studies regarding the effects of tourism on Brazilian reefs remain scarce. The area is frequently affected by vessels and divers, who can directly interact with the environment, thereby breaking coral colonies and damaging the local reef system.
High levels of scuba diving activity may cause changes in the structure of fish schools, short-term behavioral changes and a decrease in the richness and abundance of various species Albuquerque et al. However, measures to intensify supervision in Marine Protected Areas MPAsto define the local load capacity and to limit the daily number of divers, in addition to promoting visitor awareness, can mitigate the impact of tourism on Brazilian reef environments Giglio et al.
One study on the human presence in the Porto de Galinhas reef Northeast Coast, Pernambuco found that marine trampling had led to ofensanz changes on the meiofauna. This current situation highlights the urgent need for the integration of scientific research and specific technical initiatives to help marine managers more efficiently allocate their resources. Fishing activity Artisanal fishing plays a key role in the local economy for many different countries; however, its impact on coral reefs can be catastrophic and may also have a significant effect on the community structure Bender et al.
Despite several successful examples of fishery management, most of the wasi s fish stocks are currently being overexploited, and many are on their way to collapse FAO, Among the most prominent effects of overfishing are the general decline in abundance and biomass Ruttenberg, and the reduction in the number of certain functional groups, such as piscivorous fish De Boer et al.
Overfishing has altered the density and size structure of the top predators that live in Brazil s coral reefs Floeter et al. Critical functional groups act to maintain the strength and resiliency of coral reef ecosystems, and their removal can have profound effects on carlox community structure and dynamics of these ecosystems Mumby et al.
These strategies include a wide range of rules, laws, economic instruments and community-based management Abdullah et al. In recent years, the need for holistic approaches e.
Establishing exclusion areas that prohibit reef environments from being used no take areas can promote the recovery of overexploited populations within their borders Halpern et al. Using a broader approach, by measuring different components of the reef ecosystem in the Abrolhos Archipelago East Coast, BahiaBruce et al. Overexploited reefs in the Caribbean showed the growth of sponges i.
Fishing management and habitat protection can provide significant benefits, both by orenxanz productivity through greater growth or lower natural mortality of commercial stocks, and by protecting noncommercial species Holland, Therefore, ensuring that ecosystems function normally, such qask their services can be maintained, implies the need for governance models that are able to adaptively manage complex socio-ecological systems Batista et al.
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Coastal pollution Water quality has declined rapidly in areas lacking land use regulation, particularly in agricultural and developing coastal areas Hertler et al. Coastal nutrient loading, sedimentation and introducing terrestrial organisms into the marine environment are among the main local factors linked to the recent global-scale proliferation of coral diseases Harvell et al.
In addition, increased concentrations of nutrients can cause an imbalance in the relationship between zooxanthellae endosymbiotic dinoflagellates – Symbiodinium spp. In Brazil, the reefs near the shore are subject to heavy discharges of siliciclastic sediments and receive significant volumes of nutrients from terrigenous sources, including nutrients from runoff, river discharge and groundwater input Costa Jr.
The potential for contamination by nutrients in waters off the Brazilian coast is critical, especially in waters near urban areas. According to Costa Jr. This relationship suggests that soil drainage and groundwater infiltration are important factors regarding the input of nutrients along the coast.
Nutrient concentrations also decrease with increasing distance from the coast, indicating an effect of nutrients from terrestrial and coastal sources, both natural e. Enriching nutrient levels, as a result of groundwater contamination by domestic sewage on the East Coast Bahiamay favor macroborer activity e.
In Brazil, the amount of sediment flowing into the sea has increased significantly because of increased erosion of coastal areas. This erosion has been caused. The Northeast Coast features extensive sugar cane plantations located only a few kilometers from the shore, a region that hosts numerous coastal reefs. Industrial effluents, such as vinasse, which is a byproduct of the sugar manufacturing process, or waste from distillation following alcohol or sugar cane brandy production, have historically been dumped into the region s watercourses, causing damage to the marine environment.
Hydrographic basin management is an essential component in multidisciplinary approaches to reef management Ruckelshaus et al.
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Introduction of species As globalization and international trade have increased, aquatic and terrestrial species have been deliberately or accidentally transferred to areas outside of their natural geographical distribution.
According to Junqueira et al. In a recent orenwanz, Riul et al. These species are orensabz able to avoid native predators and cause changes in the settlement patterns of native colonizing organisms Lages et al. Creed demonstrated the deleterious effect of T.
Similarly, the exotic octocoral Stereonephthya aff. Exotic lionfish species Pterois volitans and P. In Brazil, the first sighting of P.
The possible ecological impacts of this invasion of native species are a legitimate cause for concern for the Brazilian government Luiz et al.