scholarly journals Community structure of shallow rocky shore fish in a tropical bay of the southwestern Atlantic

2015 ◽  
Vol 63 (4) ◽  
pp. 379-396 ◽  
Author(s):  
Camilo Moitinho Ferreira ◽  
Ericka O. Cavalcanti Coni ◽  
Diego V. Medeiros ◽  
Cláudio L. S. Sampaio ◽  
José Amorim Reis-Filho ◽  
...  
Keyword(s):  
Community Structure ◽  
Rocky Shore ◽  
Conservation Status ◽  
Reef Fishes ◽  
Rocky Shores ◽  
Southwestern Atlantic ◽  
Fish Community Structure ◽  
Fishing Activity ◽  
Tropical Regions ◽  
Southwestern Atlantic Ocean

Abstract Southwestern Atlantic Ocean rocky shores sustain important reef fish communities. However, those communities in tropical regions are not well understood, especially in Brazil. In this present article we assess community parameters of reef fishes such as composition, trophic organization and their relationships with physical and biological factors on four tropical rocky shores in Todos os Santos Bay, southwestern Atlantic. During six months, a total of 80 visual censuses were performed, in which 3,582 fish belonging to 76 species were recorded. Territorial herbivorous fish and turf algae were dominant at all the sites. The spatial variability of fish community structure was related to the benthic cover composition and depth. The high abundance of territorial herbivores and mobile invertebrate feeders could be associated with high levels of turf cover, low wave exposure and shallow waters. Moreover, this fact could be a consequence of the low density of roving herbivores and large carnivores probably due to the pressure of intense fishing activity. Thus complementary studies are needed to evaluate the actual conservation status of these rocky shore reefs, singularly located habitats connecting inner and outer reefs in Todos os Santos Bay.

Community structure of reef fishes on a remote oceanic island (St Peter and St Paul’s Archipelago, equatorial Atlantic): the relative influence of abiotic and biotic variables

2015 ◽  
Vol 66 (8) ◽  
pp. 739 ◽  
Author(s):  
Osmar J. Luiz ◽  
Thiago C. Mendes ◽  
Diego R. Barneche ◽  
Carlos G. W. Ferreira ◽  
Ramon Noguchi ◽  
...  
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Explanatory Variable ◽  
Reef Fishes ◽  
Boosted Regression Trees ◽  
Fish Community Structure ◽  
Equatorial Atlantic ◽  
Topographic Complexity ◽  
Abiotic And Biotic Factors ◽  
Natural Laboratory

This study investigates the reef fish community structure of the world’s smallest remote tropical island, the St Peter and St Paul’s Archipelago, in the equatorial Atlantic. The interplay between isolation, high endemism and low species richness makes the St Peter and St Paul’s Archipelago ecologically simpler than larger and highly connected shelf reef systems, making it an important natural laboratory for ecology and biogeography, particularly with respect to the effects of abiotic and biotic factors, and the functional organisation of such a depauperate community. Boosted regression trees were used to associate density, biomass and diversity of reef fishes with six abiotic and biotic variables, considering the community both as a whole and segregated into seven trophic groups. Depth was the most important explanatory variable across all models, although the direction of its effect varied with the type of response variable. Fish density peaked at intermediate depths, whereas biomass and biodiversity were respectively positively and negatively correlated with depth. Topographic complexity and wave exposure were less important in explaining variance within the fish community than depth. No effects of the predictor biotic variables were detected. Finally, we notice that most functional groups are represented by very few species, highlighting potential vulnerability to disturbances.

scholarly journals Reef fish community structure in the islands of Paraja Bay, Pandeglang District, Banten, Indonesia

2021 ◽  
Vol 22 (10) ◽  
Author(s):  
MUJIYANTO MUJIYANTO ◽  
YAYUK SUGIANTI ◽  
YUSUF ARIEF AFANDY ◽  
RISNAWATI RAHAYU ◽  
R. ARIEF BUDIKUSUMA ◽  
...  
Keyword(s):  
Community Structure ◽  
Reef Fish ◽  
Fish Species ◽  
Fish Community ◽  
Reef Fishes ◽  
Small Islands ◽  
Fish Community Structure ◽  
Evenness Index ◽  
Reef Fish Community ◽  
Low Diversity

Abstract. Mujiyanto, Sugianti Y, Afandy YA, Rahayu R, Bidikusuma RA, Nasriri AS, Syam AR, Purnaningtyas SE. 2021. Reef fish community structure in the islands of Paraja Bay, Pandeglang District, Banten, Indonesia. Biodiversitas 22: 4402-4413. Paraja Bay waters have five small islands that coexist with Ujung Kulon National Marine Park and act as a buffer zone for the diversity of fishery resources. This study aimed to assess the reef fishes community structure at small islands in Paraja Bay. Observations were made in 20 locations during August and September 2019 in the five small islands. Reef fishes community structure showed 106 species as included major group (54 species), indicator group (24 species) and target group (28 species), among five small islands, i.e. Badul, Mangir, Oar, Sumur and Umang Islands. The highest reef fishes abundance was founded in Umang Island waters. Several target fish species recorded during the study were mature fish (such as those targeted by fishermen). Only a small proportion were juveniles. Reef fish community structure was categorized as stress community to stable community with its indication was low diversity value, high evenness index, and low dominance. The low diversity index value illustrates that the level of uniformity of reef fish species in Paraja Bay waters is high. This condition is evidenced by each coral fish group's evenness index included in the main species group around 0.93 to 0.98. The target species is 0.88 to 0.99.

scholarly journals The role of macrobiota in structuring microbial communities along rocky shores

2014 ◽  
Author(s):  
Catherine A Pfister ◽  
Jack A Gilbert ◽  
Sean M Gibbons
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Rocky Shore ◽  
Alpha Diversity ◽  
Rocky Shores ◽  
Microbial Composition ◽  
Habitat Specificity ◽  
Microbial Habitat ◽  
Inert Surfaces

Rocky shore microbial diversity presents an excellent system to test for microbial habitat specificity or generality, enabling us to decipher how common macrobiota shape microbial community structure. At two coastal locations in the northeast Pacific Ocean, we show that microbial composition was significantly different between inert surfaces, the biogenic surfaces that included rocky shore animals and an alga, and the water column plankton. While all sampled entities had a core of common OTUs, rare OTUs drove differences among biotic and abiotic substrates. For the mussel Mytilus californianus, the shell surface harbored greater alpha diversity compared to internal tissues of the gill and siphon. Strikingly, a 7-year experimental removal of this mussel from tidepools did not significantly alter the microbial community structure of microbes associated with inert surfaces when compared with unmanipulated tidepools. However, bacterial taxa associated with nitrate reduction had greater relative abundance with mussels present, suggesting an impact of increased animal-derived nitrogen on a subset of microbial metabolism. Because the presence of mussels did not affect the structure and diversity of the microbial community on adjacent inert substrates, microbes in this rocky shore environment may be predominantly affected through direct physical association with macrobiota.

scholarly journals The role of macrobiota in structuring microbial communities along rocky shores

2014 ◽  
Author(s):  
Catherine A Pfister ◽  
Jack A Gilbert ◽  
Sean M Gibbons
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Rocky Shore ◽  
Alpha Diversity ◽  
Rocky Shores ◽  
Microbial Composition ◽  
Habitat Specificity ◽  
Microbial Habitat ◽  
Inert Surfaces

Rocky shore microbial diversity presents an excellent system to test for microbial habitat specificity or generality, enabling us to decipher how common macrobiota shape microbial community structure. At two coastal locations in the northeast Pacific Ocean, we show that microbial composition was significantly different between inert surfaces, the biogenic surfaces that included rocky shore animals and an alga, and the water column plankton. While all sampled entities had a core of common OTUs, rare OTUs drove differences among biotic and abiotic substrates. For the mussel Mytilus californianus, the shell surface harbored greater alpha diversity compared to internal tissues of the gill and siphon. Strikingly, a 7-year experimental removal of this mussel from tidepools did not significantly alter the microbial community structure of microbes associated with inert surfaces when compared with unmanipulated tidepools. However, bacterial taxa associated with nitrate reduction had greater relative abundance with mussels present, suggesting an impact of increased animal-derived nitrogen on a subset of microbial metabolism. Because the presence of mussels did not affect the structure and diversity of the microbial community on adjacent inert substrates, microbes in this rocky shore environment may be predominantly affected through direct physical association with macrobiota.

Community structure of reef fishes in shallow waters of the Fernando de Noronha archipelago: effects of different levels of environmental protection

2017 ◽  
Vol 68 (7) ◽  
pp. 1303 ◽  
Author(s):  
M. I. Ilarri ◽  
A. T. Souza ◽  
R. S. Rosa
Keyword(s):  
Community Structure ◽  
Environmental Protection ◽  
Fish Communities ◽  
Reef Fishes ◽  
Habitat Characteristics ◽  
Fish Community Structure ◽  
Reef Area ◽  
Shallow Reef ◽  
Fernando De Noronha ◽  
Different Levels

Marine protected areas (MPAs) are important tools for the evaluation of the biodiversity and status of marine systems. However, not all MPAs are equal in their design and management; therefore, it is important to understand how different levels of protection affect the fish communities. In the present study, the shallow reef-area fishes of seven areas in Fernando de Noronha archipelago (north-eastern Brazil) with dissimilar habitat characteristics and different levels of environmental protection (no-take MPA and MPA) were compared. In total, 140 visual censuses were performed, in which 12958 fishes of 27 families and 50 species were recorded. Differences were recorded between no-take MPAs and MPAs in the benthic composition, abiotic data and fish-community structure and composition. These differences were associated with a higher diversity, richness, density of larger fishes and top target fish families, and biomass per census (nearly 2-fold higher in the no-take MPA). Our findings suggested that the differences in the ichthyofauna were probably more related to the different levels of protection than to dissimilarities in the habitat structure among areas, and that the local no-take MPA (National Marine Park of Fernando de Noronha) is effective in maintaining the shallow reef-area fish communities healthy and diverse.

Copepod community structure after a mining dam disaster in the Southwestern Atlantic Ocean

2021 ◽  
pp. 107325
Author(s):  
Laura Rodrigues da Conceição ◽  
Lilian Elisa Demoner ◽  
Juliano Bicalho Pereira ◽  
Fernanda Perassoli ◽  
Renato David Ghisolfi ◽  
...  
Keyword(s):  
Community Structure ◽  
Atlantic Ocean ◽  
Southwestern Atlantic ◽  
Copepod Community ◽  
Southwestern Atlantic Ocean ◽  
Mining Dam

scholarly journals Invasive lionfish had no measurable effect on prey fish community structure across the Belizean Barrier Reef

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3270 ◽  
Author(s):  
Serena Hackerott ◽  
Abel Valdivia ◽  
Courtney E. Cox ◽  
Nyssa J. Silbiger ◽  
John F. Bruno
Keyword(s):  
Community Structure ◽  
Reef Fish ◽  
Fish Community ◽  
Fish Communities ◽  
Reef Fishes ◽  
Barrier Reef ◽  
Fish Community Structure ◽  
Prey Fish ◽  
Invasive Lionfish ◽  
Study Sites

Invasive lionfish are assumed to significantly affect Caribbean reef fish communities. However, evidence of lionfish effects on native reef fishes is based on uncontrolled observational studies or small-scale, unrepresentative experiments, with findings ranging from no effect to large effects on prey density and richness. Moreover, whether lionfish affect populations and communities of native reef fishes at larger, management-relevant scales is unknown. The purpose of this study was to assess the effects of lionfish on coral reef prey fish communities in a natural complex reef system. We quantified lionfish and the density, richness, and composition of native prey fishes (0–10 cm total length) at sixteen reefs along ∼250 km of the Belize Barrier Reef from 2009 to 2013. Lionfish invaded our study sites during this four-year longitudinal study, thus our sampling included fish community structure before and after our sites were invaded, i.e., we employed a modified BACI design. We found no evidence that lionfish measurably affected the density, richness, or composition of prey fishes. It is possible that higher lionfish densities are necessary to detect an effect of lionfish on prey populations at this relatively large spatial scale. Alternatively, negative effects of lionfish on prey could be small, essentially undetectable, and ecologically insignificant at our study sites. Other factors that influence the dynamics of reef fish populations including reef complexity, resource availability, recruitment, predation, and fishing could swamp any effects of lionfish on prey populations.

Fish community structure, habitat complexity, and soundscape characteristics of patch reefs in a tropical, back-reef system

2019 ◽  
Vol 609 ◽  
pp. 33-48 ◽  
Author(s):  
RP Lyon ◽  
DB Eggleston ◽  
DR Bohnenstiehl ◽  
CA Layman ◽  
SW Ricci ◽  
...  
Keyword(s):  
Community Structure ◽  
Habitat Complexity ◽  
Fish Community ◽  
Back Reef ◽  
Fish Community Structure ◽  
Patch Reefs ◽  
Reef System
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