Carlos Werner Hackradt

Carlos Werner Hackradt
Universidade Federal do Sul da Bahia · Centre for Environmental Science

PhD. Marine Biology

About

54
Publications
24,785
Reads
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898
Citations
Citations since 2017
21 Research Items
593 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
Graduate in Biological Sciences, I have a Certificated Program in Conservation Biology and Wild Life Management, Master in Science in Ecology & Conservation and PhD in Marine Biology. Has experience in Marine Ecology and Zoology, acting on the following subjects: Fish, Coral Reef Fish, Ichthyofauna, Endangered Species Research, Coral reefs, Rocky reefs, Artificial reefs, Marine ecology, Marine Protected Areas.
Additional affiliations
June 2014 - present
Universidade Federal do Sul da Bahia
Position
  • Professor (Associate)
January 2014 - May 2014
Federal University of Pernambuco
Position
  • PostDoc Position
March 2013 - December 2013
Universidade Federal da Paraíba
Position
  • PostDoc Position
Education
October 2008 - December 2012
University of Murcia
Field of study
  • Marine Biology
March 2005 - November 2006
Universidade Federal do Paraná
Field of study
  • Ecology & Conservation
March 2004 - December 2004
Pontifical Catholic University of Paraná
Field of study
  • Biodiversity, Conservation and Management

Publications

Publications (54)
Article
Full-text available
Top predators have strong influence on the structure and dynamics of marine ecosystems. These organisms have been largely used as indicators to assess the effectiveness of marine protected areas (MPAs). In Brazil, the impact of fisheries on reef species, such as groupers and sea basses, and the importance of local marine reserves in the maintenance...
Article
Full-text available
Groupers species are extremely vulnerable to overfishing and many species are threatened worldwide. In recent decades, Mediterranean groupers experienced dramatic population declines. Marine protected areas (MPAs) can protect populations inside their boundaries and provide individuals to adjacent fishing areas through the process of spillover and l...
Article
Full-text available
Post-settlement events can significantly alter the density distribution of settlers and subsequently the adult population structure. The temporal and inter-annual variability of settlement and the effects of mortality on recruitment were investigated across 2 years in the vicini-ties of Cabo de Palos–Islas Hormigas Marine Reserve by visual census a...
Article
When the Fundão dam collapsed in Brazil, 50 million m³ of iron ore tailings were released into the Doce river, resulting in the world's largest mining disaster. The contaminated mud was transported 668 km downstream of the Doce river and reached the Atlantic Ocean 17 days after the collapse. Seven months later, there was evidence that the tailings...
Article
Tide pools are important environments for several fish species, as they offer essential resources such as shelter and food. Thus, understanding the relationships of the ichthyofauna with the habitat structural characteristics in tide pools is important to understand the distribution patterns of fish assemblages in shallow environments. This study i...
Article
Local knowledge is a fundamental source of information for starting spawning aggregation studies in areas where this phenomenon is still unknown or little studied. Among the species that present this reproductive strategy, groupers and snappers represent two of the most relevant components of artisanal and commercial capture worldwide and are highl...
Article
• Marine protected areas (MPAs) are used as fisheries management and conservation tools. Well‐enforced no‐take zones allow the rebuilding of natural populations of exploited species; however, there is still controversy on the role of buffer zones. • The effectiveness of MPAs could be underestimated, as fish population assessments depend largely on...
Article
Full-text available
Understanding habitat-level variation in community structure provides an informed basis for natural resources’ management. Reef fishes are a major component of tropical marine biodiversity, but their abundance and distribution are poorly assessed beyond conventional SCUBA diving depths. Based on a baited-video survey of fish assemblages in Southwes...
Article
Understanding the environmental and anthropogenic factors that affect nesting site selection by sea turtles is key to maintaining priority conservation areas. The species Lepidochelys olivacea, Caretta caretta, and Eretmochelys imbricata nest annually on the island of Comandatuba (Una, northeastern Brazil), where this survey was conducted. We evalu...
Article
Causal mechanisms for broad-scale reef fish diversity patterns are poorly understood and current knowledge is limited to trends of species richness. This work compared the effects of ecological drivers on components of fish diversity across reefs spanning over 2.000 km of the tropical Brazilian coastline. A quarter of communities’ diversity is acco...
Article
Full-text available
The characterization of habitat use by predator species is crucial to understand its effect over fish distribution. We tested the hypothesis that fish density affects habitat use as well as influence on the relationships between top predators (groupers) and meso-predators (combers) by evaluating their distribution in and outside a marine reserve (M...
Article
We reported the genus Parasphyraenops (Perciformes: Serranidae) in the Brazilian Biogeographic Province. Four Parasphyraenops incisus specimens were identified based in body shape and color pattern through underwater remote video records, on shallow coral reefs in the Bahia state, Brazil. In the video frames P. incisus was observed swimming close t...
Article
The greenback parrotfish, Scarus trispinosus, is the largest herbivorous fish inhabiting Southwestern Atlantic reefs, and was recently included in the IUCN red list of threatened species as endangered due to the overexploitation of their populations. The aim of this work was to evaluate the existence of structured populations (i.e. genetic unities)...
Article
The role of Marine Protected Areas on distinct life stages of Mediterranean reef fish species (classified on the basis of their economic value and mobility categories) was assessed in a network of marine reserves in SE Spain. Only abundance and biomass of adult of both commercial and demersal species were positively affected by protection. Gradient...
Article
Species functional behaviors amidst the food web, such as feeding ecology in ecosystems, are directly connected to their habitat preferences and use. In reef ecosystems, groupers and sea bass are considered key species, as top-down controllers, regulating the trophic levels on which they feed. Moreover, they are a diversified group of actinopterygi...
Preprint
Full-text available
Marine protected areas (MPAs) are important spatial management tools for fish populations by protecting them completely or partially from extractive human uses. As a result an increase of fish density, biomass and size of target species are readily observed within their limits. In this work we aimed to verify the effectiveness of Brazilian MPAs reg...
Article
Full-text available
The distribution of the allochthonous crab Percnon gibbesi and its relationships with other benthic invertebrate species was assessed inside the marine reserve of Cabo de Palos—Islas Hormigas (Mediterranean sea, Spain) and neighbouring non-protected sites. Although a significant spatial variability was detected at finer spatial scale, there was no...
Article
The early life history of Lutjanus alexandrei and Lutjanus jocu in Southwestern Atlantic is still largely unknown. Habitat use of different life stages (i.e. size categories and densities) of the Brazilian snapper (L. alexandrei) and dog snapper (L. jocu) was examined in a tropical portion of NE coast of Brazil. Visual surveys were conducted in dif...
Article
Full-text available
Fish populations are linked to each other via dispersal of individuals as eggs, larvae, juveniles or adults. The understanding of this process, known as connectivity, has a pivotal role for the management of overexploited fish stocks and the development of accurate conservation strategies. Knowledge on connectivity and fish movements is considered...
Article
Population connectivity scales are important tools to achieve a mechanistic understanding of the factors regulating the abundance and distribution of marine populations and therefore support conservation actions to manage fisheries and stocks. We used 10 microsatellites markers on mullets' samples across the Spanish coast to determine the spatial s...
Chapter
Full-text available
1 Introducción Los ecosistemas marinos costeros se cuentan entre los más productivos del planeta, y los hábitats que albergan juegan un papel preponderante en las pesquerías costeras al proporcionar recursos esenciales (alimento, espacio, refugio) a las poblaciones de las especies que las sustentan (Martinez et al., 2007). La creciente pérdida de b...
Conference Paper
Early life history stages (ELHS) constitutes a poorly known phase of fish life cycle, in which at least 90% of mortality occurs, therefore affecting directly adult population dynamics. A detailed knowledge of the events taking place during these stages is crucial to explain connectivity patterns and thus helping the proper management of marine popu...
Article
Full-text available
Habitat complexity strongly influences reef fish community composition. An understanding of the underlying reasons for this relationship is important for evaluating the suitability of artificial reef (AR) habitats as a marine resource management tool. We studied the influence of AR habitat structure on fish assemblage composition off the southern c...
Article
Full-text available
Estuarine beaches are low energy environments found along the coast in several protected places around the world, such as estuaries, bays or areas protected by submerged bars or coral reefs. Although common, these places have been poorly studied. Using a seine net, six beaches were sampled along an environmental gradient for 12 months. During this...
Article
Full-text available
Since its first record in Spanish waters in 2000, Percnon gibbesi has expanded its distribution southwards. In the summer of 2009 it was observed in the south-east Mediterranean Sea including inside a marine reserve. Its widespread presence during the last year in many coastal sites of the Murcia Region indicates its fast colonization ability and t...
Article
Full-text available
Since its first record in Spanish waters in 2000, Percnon gibbesi has expanded its distribution southwards. In the summer of 2009 it was observed in the south-east Mediterranean Sea including inside a marine reserve. Its widespread presence during the last year in many coastal sites of the Murcia Region indicates its fast colonization ability and t...
Article
Full-text available
Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (community indicators) were all influenced by the tidal state. Samples from rising tides were more representative, probably due to onshore fish movements fo...
Article
Full-text available
Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (cornmunity indicators) were all influenced by the tidal state. Samples from rising tides were more representative, probably due to onshore fish movements f...
Article
Full-text available
Fish community structure in low energy beaches of estuarine complex Paranaguá Bay, Brazil. Aiming the characterization of ichthyofaunal assemblage of low energy estuarine environments, six beaches distributed along the east-west axis of Paranaguá Bay, Paraná, were monthly evaluated through a seine beach net named picaré. Samples revealed a varied s...
Article
Full-text available
Recently, reef fish studies have been receiving more attention from researchers. Five zoogeographical provinces were determined along the brazilian coast with the State of Paraná baing included within the south-southeast province. Reef fish fauna was accessed through underwater visual census at natural and artificial habitats. We observed that both...
Article
Recently, reef fish studies have been receiving more attention from researchers. Five zoogeographical provinces were determined along the brazilian coast with the State of Paraná baing included within the south-southeast province. Reef fish fauna was accessed through underwater visual census at natural and artificial habitats. We observed that both...
Article
Full-text available
Despite being an endangered species, the goliath grouper (Epinephelus itajara) has been reported as occurring in the artificial reef system (ARS) in Paraná since its implementation in 1996. At a first evaluation the PROMERO program investigated the occurrence and abundance of the species at the sites. Through local ecological knowledge (LEK) the ma...
Article
Full-text available
Following behaviour is a common interspe-cific feeding association in which nuclear species forage over the bottom, causing dis-turbance in the benthic community, while the followers (fishes) feed opportunistically (Sazima et al. 2007). The cobia, Rachycentron canadum (Linnaeus, 1766) is a large pelagic fish with a nearly worldwide distribution in...
Article
Full-text available
Wave action in sandy beach surf zones and its influence on species composition were evaluated at three sites at Pontal do Paraná, Paraná State, between June/2004 and May/2005. At each sampling site, five hauls were performed monthly using a 15 m long, 2.6 m height beach seine with a 5 mm mesh-size. Samplings were carried out at low water spring tid...
Article
Full-text available
The ecological role of sand beaches as nursery ground for fish, by providing refuge, food and protection, was sustained in this work given the dominant presence of juvenile fish, which corresponded to 98% of total capture. These habitats could be considered accessory areas for transient fish fauna such as anchovies (Anchoa lyolepis and Anchoa trico...
Article
Full-text available
Muitos estudos ecológicos são conduzidos sem a prévia existência de delineamentos amostrais adequados, de forma que dados são coletados na ausência de critérios e com finalidades não evidentes, e somente após sua coleta julgam-se quais análises estatísticas são as mais apropriadas aos dados recolhidos. Com base em dois estudos realizados com peixes...
Thesis
Full-text available
Diversos trabalhos na literatura tentam definir as diferenças entre os tipos de ambientes praiais existentes numa tentativa de padronizar a metodologia e poder comparar os resultados encontrados. Atualmente pode-se definir dois tipos básicos de ambientes praiais, os de alta energia, formado por ambientes expostos à ação dos oceanos e onde a princip...
Article
Full-text available
Seasonal abundance and composition of fish assemblage in two estuarine beaches in Paranaguá's Bay, Paraná. The aim of the present work was the characterization of the ichthyofauna of two estuarine beaches in the Bay of Paranaguá, PR. Highest numbers of species and individuals were sampled in the warmer months, during which the occurrence of sporadi...
Article
Full-text available
Many ecological studies are conducted without appropriate sampling design, data collection are made without criteria and non evident purposes and only after its collection it is judged which statistical analysis are more appropriate to gathered data. Based on two fish studies realized at Paraná coast, it displays how lack of replication could lead...
Article
Full-text available
RESUMO As áreas rasas além de oferecerem abundância de alimento, são tidas como importantes áreas de refúgio para as populações de peixes. A descrição das assembléias de peixes dos ambientes estuarinos é de fundamental importância para medidas de gerenciamento. Tal descrição gera subsídios que funda-mentam medidas de uso sustentado dos ambientes em...
Thesis
Full-text available
As tartarugas marinhas são animais ameaçados de extinção, as principais causas são: a captura acidental em artes de pesca, poluição do ambiente mar e descaracterização do ambiente por ação antrópica. A predação natural de tartarugas marinhas causa poucos impactos sobre as populações naturais. No entanto, quando existem outras causas de mortalidade,...
Conference Paper
Full-text available
Marine protected areas (MPA) constitute a major attractive for tourism, especially for recreational SCUBA diving, because for the high environmental and scenic quality of its seabed. This activity, although beneficial for the local economy, generates a number of impacts on marine ecosystems that have most influence on benthic communities. In the pr...

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Projects

Projects (9)
Project
This proposal aims to test how habitat quality affects the process of exporting biomass of reef fish species, under some level of threat (according to IUCN) and exploited commercially, from inside to outside the Abrolhos National Marine Park. Test the hypothesis of Hackradt et al. (2014), which incorporates the main factors (protection and habitat) of "spillover" in marine reserves, will elucidate issues that will allow to define more assertively in the management and creation of marine reserves that really fulfill the role of adjacent replacement areas that having its population overexploited will also assist in the detection of areas with high potential for biomass exports and in the restoration of populations of threatened or commercially exploited species, intensifying the effectiveness of the reserves.
Project
To evaluate how the structures of the marine landscape influence the distribution pattern of the fish community according to the availability of resources and how the mapping can contribute to the effectiveness of the conservation of marine ichthyofauna.