Pedro Gatts

Uenf, Laboratório De Ciências Ambientais, Post-Doc

UFF - Universidade Federal Fluminense, Geociências, Faculty Member

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Doutor em Dinâmica dos Oceanos e da Terra da Universidade Federal Fluminense - UFF (2019). Mestre em Ecologia e Recursos Naturais, no Centro de Biociências e Biotecnologia da Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF (2014). Graduado em Ciências Ambientais no Centro de Biociências e Biotecnologia da Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF (2012).

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Eurico Dornellas

Universidade Vila Velha

Ilana Zalmon

Fabrício Saleme de Sá

Werther Krohling

Daniel Brotto

Jean-Christophe Joyeux

Universidade Federal do Espirito Santo

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Papers by Pedro Gatts

The effect of an artificial reef system on the transient fish assemblages – south-eastern coast of Brazil

by Pedro Gatts and Ilana Zalmon

Journal of the Marine Biological Association of the United Kingdom, 2014

Artificial reefs (ARs) are often used to improve fishing and, consequently, the economy of a regi... more Artificial reefs (ARs) are often used to improve fishing and, consequently, the economy of a region. However, the way in which the species use the reefs may vary between fish assemblages. An assessment was made of the influence of an AR complex on the transient fish population off the northern coast of Rio de Janeiro state and, therefore, two control areas were sampled. Gillnets were used to capture individual fish in six sampling surveys. Cumulative abundance and biomass curves (ABC) were used to assess the possible effects of the reefs on the community’s functional structure. In the dry season, during which the influence of the Paraíba do Sul River is smaller, a larger richness of r-strategy species and juveniles of K-strategy species was observed in the reef area compared with the control areas, suggesting that the AR acts as a protective environment for these species. During the lower river discharge period the results indicated a potential disturbance in the functional structure of the AR fish community and, therefore, a less stable environment relative to the control areas. This ‘instability’ warrants a positive connotation, as it indicates that the artificial reefs are harbouring species that are particularly sensitive to predation, making the reef a powerful tool for maintaining these populations on the northern coast of Rio de Janeiro.

Influence of the artificial reef size configuration on transient ichthyofauna – Southeastern Brazil

by Pedro Gatts and Ilana Zalmon

Ocean & Coastal Management, 2014

ABSTRACT To investigate how variations in the volume of artificial reefs affect the structure and... more ABSTRACT To investigate how variations in the volume of artificial reefs affect the structure and composition of the transient ichthyofauna, reefball-type concrete modules were arranged at 9 m of depth along the northern coast of the state of Rio de Janeiro. The modules were arranged in three configurations, each in triplicate: (1) solitary modules (1 m3), (2) side-by-side modules (2 m3) and (3) modules forming a triangle (3 m3). The surrounding ichthyofauna were sampled in two periods of the year (dry: September 2009 and October 2010; rainy: April 2010 and April 2011) with gillnets to record the richness, species diversity, number of individuals and biomass per volume unit. The total mean values of richness, diversity, number of individuals and biomass did not differ significantly among the reef volumes. However, when these variables were analyzed per standardized volume unit, there was an increase in these variables with the increase in reef volume, considering all the transient ichthyofauna as well as the most representative families, Ariidae and Sciaenidae. A non-metric multidimensional scaling ordination analysis revealed differences in the composition of the ichthyofauna between the sampling periods, dominated by Sciaenidae (Stellifer rastrifer, Paralonchurus brasiliensis, Larimus breviceps and Cynoscion virescens) in the dry period and by Ariidae (Aspistor luniscutis) and Carcharinidae (Rhizoprionodon porosus) in the rainy period. The results suggest that the increase in module size from 1 to 3 m3 may result in slight alterations in the community descriptors, with a decrease in the relative values of richness, diversity and density per standardized volume unit. Furthermore, the effects of the seasonal flow of the Paraíba do Sul River may overlap the effects of reef configuration, mainly in the rainy period with higher flow. The implementation of several dispersed 1 m3 modules seems to be the most favorable configuration to attract transient ichthyofauna, especially Ariidae and Sciaenidae, on the northern coast of the state of Rio de Janeiro.

Impact of artificial patchy reef design on the ichthyofauna community of seasonally influenced shores at Southeastern Brazil

by Ilana Zalmon, Pedro Gatts, Diogo Da Rocha, and Bruno Masi

Aquatic Ecology, 2015

To investigate how variations in the smallscale distance between patchy reef modules affect the s... more To investigate how variations in the smallscale distance between patchy reef modules affect the structure and composition of the associated ichthyofauna, concrete reefballs were arranged in three distance configurations, 0.5, 5 and 15 m, at 9 m depth off the northern Rio de Janeiro coast. The ichthyofauna was sampled in the dry and rainy seasons using gillnets, and the composition, richness, diversity, abundance and biomass per distance unit were recorded. The availability of potential macrobenthic prey was evaluated using a stainless steel corer for each inter-module distance, and the results correlated with the stomach contents of the captured ichthyofauna. Community descriptors did not significantly change with treatments of reef distance. A canonical correspondence analysis revealed similar fish composition among reef distance treatments, but increased occurrence of exclusive species and habitatdependent fish with increased distances among reef modules. Non-metric multidimensional scaling showed different composition of fish populations between sampling periods, with a predominance of Sciaenidae in the dry season and Ariidae and Carcharhinidae on the rainy season. The adjacent infauna was not directly related to the ichthyofauna but to the benthic prey, which were possibly using the structure interstices, and small fish. Significant effects of seasonal freshwater and sediment loads from large regional coastal rivers may override the effects of reef configuration, especially during rainy seasons with higher inflow. As the shorter reef distance exhibited generally the same richness and abundance compared with larger and more distant reefs, a patchy design with \5.0 m distances is thus recommended for the distribution of artificial reefs to increase fish biodiversity in coastal environments with homogeneous substrate and seasonally influenced by freshwater outflow and sediment from large rivers.

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The effect of an artificial reef system on the transient fish assemblages – south-eastern coast of Brazil

by Pedro Gatts and Ilana Zalmon

Journal of the Marine Biological Association of the United Kingdom, 2014

Influence of the artificial reef size configuration on transient ichthyofauna – Southeastern Brazil

by Pedro Gatts and Ilana Zalmon

Ocean & Coastal Management, 2014

Impact of artificial patchy reef design on the ichthyofauna community of seasonally influenced shores at Southeastern Brazil

by Ilana Zalmon, Pedro Gatts, Diogo Da Rocha, and Bruno Masi

Aquatic Ecology, 2015

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