scholarly journals SPATIAL-TEMPORAL DISTRIBUTION OF POLYCHAETA IN URBANIZED SANDY BEACHES OF NORTHEASTERN BRAZIL: TOOLS FOR ENVIRONMENTAL ASSESSMENT

2021 ◽  
Vol 25 (04) ◽  
pp. 834-845
Author(s):  
Marcos Eduardo Miranda Santos ◽  
◽  
Cláudia Costa e Silva ◽  
Andrea Christina Gomes de Azevedo-Cotrim ◽  
Keyword(s):  
Environmental Assessment ◽  
Intertidal Zone ◽  
Marine Pollution ◽  
Temporal Distribution ◽  
Benthic Fauna ◽  
Sandy Beaches ◽  
Northeastern Brazil ◽  
Conservation Strategies ◽  
Taxonomic Level ◽  
Environmental Variations

In the last years, the use of Polychaeta as indicators of marine pollution has intensified, due to the sensitivity of these organisms to environmental variations and their significant presence in quantitative and qualitative terms when compared to other benthic fauna organisms. We aimed to analyze the Polychaeta assemblage of two urbanized beaches in São Luís – Maranhão (Brazil), focusing on spatial-temporal distribution and look for the relation of the species sampled and possible contamination to indicate if they are suitable for environmental assessment. Sediment collection was carried out in the intertidal zone of both beaches in dry (September and November/2015) and rainy periods (March and May/2016). The samples were screened for extraction of the species, which were classified at the lowest possible taxonomic level. The samples revealed the following taxa: Lumbrineridae (Scoletoma tetraura), Nereididae (Laeonereis culveri) and Spionidae (Scolelepis sp.). The diversity and abundance of Polychaeta were greater on Caolho Beach. On these beaches, organic enrichment is not the determining variable in the structure of the Polychaeta assembly. Other studies are needed to improve the knowledge on other macrofauna species of the studied areas, comparing the richness among microhabitats and seasons, and thus elaborate conservation strategies for these ecosystems; and to test the hypothesis of the influence of tourism on this assemblage.

scholarly journals Interstitial annelids from the Caribbean Coast of Colombia

2018 ◽  
Vol 66 (2) ◽  
pp. 658 ◽  
Author(s):  
Ana Milena Lagos ◽  
M. Victoria Leon ◽  
Sigmer Y. Quiroga ◽  
Alejandro Martínez
Keyword(s):  
Intertidal Zone ◽  
New Records ◽  
Current Knowledge ◽  
Sandy Beaches ◽  
Taxonomic Level ◽  
Complete Knowledge ◽  
The Family ◽  
The Caribbean ◽  
Distribution And Ecology ◽  
High Diversity

A total of 298 species of polychaetes have been recorded from Colombia. However, only the family Protodrilidae has been reported from the marine interstitial realm. We here aim at identifying the interstitial annelids inhabiting the sandy beaches in Santa Marta region to the most accurate taxonomic level based on light microscopy examinations. Our samples, collected from the intertidal zone at three touristic beaches in the department of Magdalena (Santa Marta Bay, Rodadero Bay, and Taganga Bay), yielded a total of 83 specimens, which we assigned to five families, ten genera and nine species. From those, two families, eight genera, and the species Hesionides gohari, Neogyptis mediterranea, Neopetitia amphophthalma, Westheidesyllis gesae, and Syllis beneliahuae represent new records for the Colombian fauna. This survey should be considered as a first step towards a complete knowledge of the Colombian diversity of interstitial annelids, and our results significantly contribute to fill the gap of our current knowledge, suggesting a high diversity of species comparable to this in better-known areas of the Caribbean and the Atlantic coasts of Brazil. A brief diagnosis, comments on distribution and ecology, and remarks are provided for each record, in order to facilitate the re-identification of the species. Rev. Biol. Trop. 66(2): 658-673. Epub 2018 June 01. 

Stranded Marine Turtles in Northeastern Brazil: Incidence and Spatial–Temporal Distribution of Fibropapillomatosis

2019 ◽  
Vol 18 (2) ◽  
pp. 249 ◽  
Author(s):  
Edson Soares da Silva-Júnior ◽  
Daniel Solon Dias de Farias ◽  
Aline da Costa Bomfim ◽  
Augusto Carlos da Boaviagem Freire ◽  
Rafael Ângelo Revorêdo ◽  
...  
Keyword(s):  
Temporal Distribution ◽  
Northeastern Brazil ◽  
Marine Turtles

scholarly journals Spatial and temporal distribution of fishing resources exploited by the Manaus fishing fleet, Amazonas, Brazil

2007 ◽  
Vol 67 (4) ◽  
pp. 651-656 ◽  
Author(s):  
VS. Batista ◽  
M. Petrere Jr
Keyword(s):  
Amazon Basin ◽  
Temporal Distribution ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Rural And Urban ◽  
Environmental Variations ◽  
Fishing Resources ◽  
The Right ◽  
Urban People ◽  
Operational Aspects

Fishing resources are important generators of income and food for the rural and urban people in the Amazon. The present paper investigates fishing and environmental variables determining fishing production landed in Manaus and evaluates the relative abundance of commercial fishes in the different sub-systems of the Central Amazon basin. Information collected was used to test the new catch index derived from multiple regressions with the following significant variables: number of fisherman days fishing; distance of the fishing ground from Manaus; amount of ice carried during the trip; and river level. There were no significant differences between mean catch values of the Purus, Madeira and Juruá sub-systems. These results suggest that the tributaries of the right margin were very similar and were the most productive in commercial terms. The actual production varies according to the recent magnitude of fishing effort, environmental variations and operational aspects of fishing, particularly ice consumption.

scholarly journals Distribution and density of the mollusk Donax striatus (Linnaeus, 1767) in a tropical estuarine region in the brazilian semi-arid

2015 ◽  
Vol 75 (4) ◽  
pp. 914-922 ◽  
Author(s):  
E. L. Medeiros ◽  
G. V. Fernandes ◽  
G. G. Henry-Silva
Keyword(s):  
Intertidal Zone ◽  
Significant Positive Correlation ◽  
River Estuary ◽  
Temporal Distribution ◽  
Average Density ◽  
Spatial And Temporal Distribution ◽  
Tropical Estuarine ◽  
Sampling Points ◽  
Estuarine Region ◽  
Semi Arid

Abstract This study evaluated the spatial and temporal distribution and density of the bivalve Donax striatus, at beaches close to the Apodi/Mossoró River estuary, through, six semiannual sampling campaigns were performed between April/2009 and October/2011. The sampled area was delimited by 20 transects that were laid perpendicular to the beach line and extended over 300 m in the intertidal zone. Seven sampling points were established in each transect, organisms and sediment were collected, and water temperature and salinity were recorded. The highest D. striatus average density (103 individuals.m–2) was observed in April/2009 and the lowest (18 individuals.m–2) in October/2010. The highest D. striatus densities occurred in beaches further from the estuarine region as demonstrated by a significant positive correlation (r2 = 0.67 and p = 0.0007). The D. striatus densities presented significant negative correlations with the percentages of organic matter in the water. This species demonstrated an aggregated distribution in the studied area.

Environmental Assessment in Marine Areas Beyond National Jurisdiction: Practice and Prospects

2017 ◽  
Vol 111 ◽  
pp. 252-255
Author(s):  
Robin Warner
Keyword(s):  
Human Activity ◽  
Marine Environment ◽  
Environmental Assessment ◽  
Marine Pollution ◽  
Scientific Research ◽  
Marine Ecosystems ◽  
Marine Resources ◽  
Governance Structures ◽  
National Jurisdiction ◽  
Marine Areas

Knowledge of the threats posed to the oceans by human activity has expanded beyond marine pollution to encompass recognition of the risks posed to vulnerable marine ecosystems (VMEs) by overfishing, destructive fisheries practices, and invasive exploitation of living and nonliving marine resources. However, with the still-developing state of marine scientific research, the majority of activities at sea continue to occur with limited knowledge of their impacts on the marine environment. In this climate of uncertainty, environmental assessment assumes heightened importance. While governance structures will generally exist to facilitate environmental assessment in marine areas within national jurisdiction, these structures are still developing for marine areas beyond national jurisdiction (ABNJ).

scholarly journals Competitive interactions among zoanthids (cnidaria: zoanthidae) in an intertidal zone of northeastern Brazil

2013 ◽  
Vol 61 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Emanuelle Fontenele Rabelo ◽  
Marcelo de Oliveira Soares ◽  
Helena Matthews-Cascon
Keyword(s):  
Intertidal Zone ◽  
Northeastern Brazil ◽  
Competitive Interactions ◽  
Aggressive Interaction ◽  
Reef Environment ◽  
Palythoa Caribaeorum ◽  
The Face ◽  
Similar Growth ◽  
Sessile Organisms ◽  
Intertidal Environments

Sessile organisms that live in consolidated substrates frequently compete for space. Coral species have many strategies to face this competition, including harming their opponents or hindering their growth. In the present study, the competitive interactions between three species of zoanthids were investigated in the intertidal zone of a sandstone reef environment in northeastern Brazil. The competitive abilities of the three species were evaluated by periodic observation of the natural fringes of contact and experimental evaluation of their growth rate through removal of 100 cm² of colonies of each species. Palythoa caribaeorum and Zoanthus sociatus had similar growth rates, and both species grew faster than Protopalythoa variabilis. The recolonization strategy seems to differ among species. The contact fringes between P. caribaeorum and Z. sociatus remained unchanged over time, without any type of aggressive interaction between them, suggesting that stand-off was the strategy used by these organisms. Palythoa caribaeorum and Z. sociatus grew among the polyps of P. variabilis, often killing its colonies. The coexistence of zoanthids reveals a capacity for survival in the face of competition for limited resources such as free substrate, which led to the colonization and establishment of zoanthids in intertidal environments.

scholarly journals Temporal distribution of fruit-feeding butterflies (Lepidoptera, Nymphalidae) in the eastern extreme of the Amazon region

2020 ◽  
Vol 50 (1) ◽  
pp. 12-23
Author(s):  
Elias da Costa ARAUJO ◽  
Lucas Pereira MARTINS ◽  
Marcelo DUARTE ◽  
Gisele Garcia AZEVEDO
Keyword(s):  
Temporal Dynamics ◽  
Abiotic Factors ◽  
Temporal Structure ◽  
Temporal Distribution ◽  
Amazon Region ◽  
Influential Factors ◽  
Northeastern Brazil ◽  
Amazon Forest ◽  
Dry Seasons ◽  
Species Richness And Abundance

ABSTRACT Rainfall is one of the most influential factors driving insect seasonality in the Amazon region. However, few studies have analyzed the temporal dynamics of fruit-feeding butterflies in the Brazilian Amazon, specially in its eastern portion. Here, we evaluated the diversity patterns and temporal distribution of fruit-feeding butterflies in a remnant of eastern Amazon forest in the Baixada Maranhense, northeastern Brazil. Specifically, we tested whether fruit-feeding butterflies are temporally structured and whether rainfall influences species richness and abundance. Butterflies were collected with baited traps in both the rainy and dry seasons for two consecutive years. In total, we captured 493 butterflies belonging to 28 species, 15 genera and eight tribes. Three species comprised about half of the overall abundance, and Satyrinae was the most representative subfamily. The fruit-feeding butterfly assemblage showed a strong temporal structure during the second year of sampling, but not during the first year. Species composition and richness did not differ between rainy and dry seasons, and neither abundance nor richness was influenced by rainfall. Our results indicate that seasonality is not a strong environmental filter in this region, and that other biotic and abiotic factors are probably driving the community structure. The predominance of palms in the Baixada Maranhense, which are used as host plants by larvae of several lepidopteran species (specially satyrines) and are available year-round, might have contributed to the observed patterns of temporal diversity.

scholarly journals Inventory of Ferns and Lycophytes of the RPPN Pedra D'Antas, Pernambuco state, northeastern Brazil

2017 ◽  
Vol 17 (4) ◽  
Author(s):  
Rafael Farias ◽  
Ivo Silva ◽  
Anna Flora Pereira ◽  
Augusto Santiago ◽  
Iva Barros
Keyword(s):  
Hot Spot ◽  
Northeastern Brazil ◽  
Conservation Strategies ◽  
Future Studies ◽  
Floristic Inventory ◽  
Forest Remnants ◽  
Fern Species ◽  
Context Knowledge ◽  
Ferns And Lycophytes ◽  
Northeastern Atlantic

Abstract The Northeastern Atlantic Forest (NAF) has a historic of intense habitat loss and fragmentation. In this context, knowledge of the species from forest remnants is urgently needed and represents a key tool for future studies and conservation strategies. Here, we present the floristic inventory of ferns and lycophytes from the Private Natural Heritage Reserve - RPPN Pedra D'Antas, located in a NAF area. The study area associated with the RPPN Frei Caneca is the Serra do Urubu, which is a hotspot for the diversity of several biological groups in the NAF. We recorded 74 fern species, distributed in 17 families and 46 genera. The most diverse families were Pteridaceae (17 species), Polypodiaceae (14 spp.), Dryopteridaceae (nine spp.) and Thelypteridaceae (seven spp.). Lycophytes were represented by four species, two families and two genera. A new record for the Northeast of Brazil, Serpocaulon hirsutulum, is presented in this study. The area has a large number of species, some of which are restricted to the NAF (e.g. Megalastrum umbrinum). Based on the richness of the study area associated with another inventory held at the RPPN Frei Caneca (138 spp.), the Serra do Urubu is corroborated as a hot-spot for the diversity of ferns and lycophytes in the NAF.

scholarly journals Spatial and temporal distribution in two anuran communities in the Chapada do Araripe, Northeastern Brasil

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Cristiana Ferreira-Silva ◽  
Deivid Batista de Oliveira ◽  
Herivelto Faustino de Oliveira ◽  
Robson Waldemar Ávila
Keyword(s):  
Leaf Litter ◽  
Rainy Season ◽  
Temporal Distribution ◽  
Water Bodies ◽  
Northeastern Brazil ◽  
Microhabitat Use ◽  
Spatial And Temporal Distribution ◽  
Humid Forest ◽  
Temporal Occurrence ◽  
Chapada Do Araripe

In this study, we report the temporal occurrence and habitat and microhabitat use by anurans in two areas located in one highland marsh (brejo-de-altitude) in northeastern Brazil. Fieldwork was carried out between September 2011 and September 2012. The recorded anurans belong to 14 species distributed in five families: Hylidae (six), Leptodactylidae (five), Bufonidae, Odontophrynidae and Pipidae (one each). Vocalization activity was seasonal and concentrated in the wetter and warmer months, but correlated to rainfall only in the top in the Chapada do Araripe. Richness and abundance of calling anurans were lower in the humid forest of the slope than in Cerradão area in the top of the Chapada do Araripe. Scinax x-signatus vocalized during nine months, and along with Dendropsophus soaresi, Phyllomedusa nordestina and Physalaemus cuvieri presented the longest periods of vocalization with the highest number of species vocalizing in at the height of the rainy season. Males were recorded vocalizing in nine different microhabitats, Adenomera sp. uses leaf litter and P. cuvieri the edge of water bodies as calling site both two sampled areas. Differences in richness and abundance of anurans between the two habitats are probably due to physical characteristics, such as presence of lentic environments.

Habitat, benthic prey, and distribution of juvenile lake sturgeon (Acipenser fulvescens) in northern Ontario rivers

1997 ◽  
Vol 54 (12) ◽  
pp. 2866-2871 ◽  
Author(s):  
Wayne B Chiasson ◽  
David LG Noakes ◽  
F William H. Beamish
Keyword(s):  
Trophic Status ◽  
Anthropogenic Activities ◽  
Temporal Distribution ◽  
Benthic Fauna ◽  
Lake Sturgeon ◽  
Acipenser Fulvescens ◽  
Benthic Organisms ◽  
Foraging Success ◽  
Northern Ontario ◽  
Northern Rivers

The spatial and temporal distribution and relative abundance of juvenile lake sturgeon (Acipenser fulvescens) and benthic macroinvertebrates were examined in the Mattagami and Groundhog rivers, tributaries of the Moose River in northern Ontario, Canada. Relative density and diversity of the benthic fauna were low, the most common taxa being Ablabesmyia sp. (Diptera) and Hexagenia sp. (Ephemeroptera). Benthic organisms were most abundant in substrate dominated by sand and clay. An appreciable portion of the riverbed was strewn with wood chips and was particularly depauperate of macrobenthos. Lake sturgeon foraged exclusively on the benthos, especially taxa of Ephemeroptera, Diptera, and Trichoptera. Hexagenia was the only prey species in greater density in sturgeon stomachs than in the benthos. The largest concentration of juvenile lake sturgeon was found adjacent to substrate dominated by sand and clay. Gillnet catches of lake sturgeon suggest that they are more active at night, which may enhance their foraging success. In these northern rivers, the trophic status of juvenile lake sturgeon is marginalized by an impoverished food supply, in part the consequence of habitat loss resulting from anthropogenic activities.

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