The influence of abiotic factors on litter deposition in a semiarid area, northeastern Brazil

The aim of this study was to determine how abiotic factors drive the phytoplankton community in a water supply reservoir within short sampling intervals. Samples were collected at the subsurface (0.1 m) and bottom of limnetic (8 m) and littoral (2 m) zones in both the dry and rainy seasons. The following abiotic variables were analyzed: water temperature, dissolved oxygen, electrical conductivity, total dissolved solids, turbidity, pH, total nitrogen, nitrite, nitrate, total phosphorus, total dissolved phosphorus and orthophosphate. Phytoplankton biomass was determined from biovolume values. The role abiotic variables play in the dynamics of phytoplankton species was determined by means of Canonical Correspondence Analysis. Algae biomass ranged from 1.17×10(4) to 9.21×10(4) µg.L-1; cyanobacteria had biomass values ranging from 1.07×10(4) to 8.21×10(4) µg.L-1. High availability of phosphorous, nitrogen limitation, alkaline pH and thermal stability all favored cyanobacteria blooms, particularly during the dry season. Temperature, pH, total phosphorous and turbidity were key factors in characterizing the phytoplankton community between sampling times and stations. Of the species studied, Cylindrospermopsis raciborskii populations were dominant in the phytoplankton in both the dry and rainy seasons. We conclude that the phytoplankton was strongly influenced by abiotic variables, particularly in relation to seasonal distribution patterns.

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Phytoplankton responses to an extreme drought season: A case study at two reservoirs from a semiarid region, Northeastern Brazil

Journal of Limnology ◽

10.4081/jlimnol.2019.1869 ◽

2019 ◽

Vol 78 (2) ◽

Cited By ~ 1

Author(s):

Carlos Y. B. Oliveira ◽

Cicero D. L. Oliveira ◽

Ayanne J. G. Almeida ◽

Alfredo O. Gálvez ◽

Danielli M. Dantas

Keyword(s):

Electrical Conductivity ◽

Phytoplankton Biomass ◽

Inorganic Nitrogen ◽

Abiotic Factors ◽

Soluble Reactive Phosphorus ◽

Extreme Drought ◽

Northeastern Brazil ◽

Semiarid Region ◽

Drought Period ◽

Reactive Phosphorus

The temporal phytoplankton biomass variation at two Neotropical reservoirs during an extreme drought season were analyzed. Here we sought to evaluate the main abiotic factors involved in dynamics of phytoplankton during this drought period. The main difference between the reservoirs was the intensive fish and shrimp farming in one of the reservoirs. For quantitative analysis, sampling with bottles were carried out at an average depth of 0.5m. Water temperature, pH and electrical conductivity parameters were measured in situ and water samples were collected for dissolved inorganic nitrogen and soluble reactive phosphorus analyses. Aquaculture was probably one among the causes for the reservoirs were so different in the physical and chemical variables, as shown by the principal components analysis. The results showed specific groups dominance in both reservoirs. In the Cachoeira II reservoir, an invasive dinoflagellate, Ceratium furcoides, was present in all analyzed months, while, in the Saco I reservoir, cyanobacteria group represented more than 50% of phytoplankton biomass, mainly Microcystis aeruginosa and Dolichospermum sp. In two reservoirs precipitation, soluble reactive phosphorus and electrical conductivity were positively related with phytoplankton. Phytoplankton biomass was considerably larger in the Cachoeira II reservoir, due to the greater size and biovolume of the dominant dinoflagellate. These findings suggest that species dominance in extreme drought events may be favored.

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

Acta Amazonica ◽

10.1590/1809-4392201901261 ◽

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.

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Abiotic factors drives floristic variations of fern’s metacommunity in an Atlantic Forest remnant

Brazilian Journal of Biology ◽

10.1590/1519-6984.175633 ◽

2018 ◽

Vol 78 (4) ◽

pp. 736-741 ◽

Cited By ~ 1

Author(s):

L. E. N. Costa ◽

R. P. Farias ◽

A. C. P. Santiago ◽

I. A. A. Silva ◽

I. C. L. Barros

Keyword(s):

Soil Moisture ◽

Atlantic Forest ◽

Abiotic Factors ◽

Northeastern Brazil ◽

Air Humidity ◽

Dissimilarity Index ◽

Relative Air Humidity ◽

Forest Remnant ◽

Environmental Variations ◽

Curtis Dissimilarity

Abstract We analyzed floristic variations in fern’s metacommunity at the local scale and their relationship with abiotic factors in an Atlantic Forest remnant of northeastern Brazil. Floristic and environmental variations were accessed on ten plots of 10 × 20 m. We performed cluster analyses, based on Bray-Curtis dissimilarity index to establish the floristic relationship. The influence of abiotic factors: luminosity, temperature, relative air humidity and relative soil moisture was evaluated from a redundancy analysis. We found 24 species belonging to 20 genera and 12 families. The fern’s flora showed high floristic heterogeneity (>75% for most of the plot’s associations). The fern’s metacommunity was structured along an abiotic gradient modulated by temperature, luminosity, and relative soil moisture.

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A new species of Tropidurus (Squamata, Tropiduridae) of the semitaeniatus group from a semiarid area in Northeastern Brazil

Zootaxa ◽

10.11646/zootaxa.2930.1.5 ◽

2011 ◽

Vol 2930 (1) ◽

pp. 60 ◽

Cited By ~ 14

Author(s):

DANIEL CUNHA PASSOS ◽

DANIEL CASSIANO LIMA ◽

DIVA MARIA BORGES-NOJOSA

Keyword(s):

New Species ◽

Body Size ◽

The State ◽

The Body ◽

Northeastern Brazil ◽

Semiarid Area ◽

Caatinga Vegetation ◽

Rocky Outcrops ◽

A New Species ◽

Scapular Region

A new species of Tropidurus of the semitaeniatus group is described from northeastern Brazil. Tropidurus sp. nov. is morphologically similar to other species of the group in the marked dorsoventral flattening of the body, and the presence of a series of sublabial shields that are larger than the adjacent scales. It is distinguished by a single middorsal longitudinal light stripe that extends from the snout to the scapular region. The new species appears to have the largest body size of the group. The new species inhabits the Vale do Jaguaribe, in the eastern part of the state of Ceará, where there are many fissured rocky outcrops surrounded by hypoxerophytic caatinga vegetation.

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Temporal variation in the diet of the endemic and threatened rodent Kerodon rupestris in the semiarid area of Brazil

Mammalia ◽

10.1515/mammalia-2021-0043 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Anderson Mendonça Conceição ◽

Adriana Bocchiglieri

Keyword(s):

Logistic Regression ◽

Temporal Variation ◽

Plant Species ◽

Niche Breadth ◽

Trophic Niche ◽

Northeastern Brazil ◽

Plant Resources ◽

Semiarid Area ◽

High Precipitation ◽

Simple Logistic

Abstract We investigated the diet and trophic niche of Kerodon rupestris in Northeastern Brazil for 12 months. The influence of precipitation was evaluated by simple logistic regression. This rodent consumed 23 plant species, mainly the leaves, resulting a low niche breadth. This species presented a greater consumption of leaves of Bauhinia cheilantha, influenced by low rainfall, and fallen flowers of Cenostigma pyramidale, influenced by high precipitation. This rodent showed plasticity in its diet and used different plant resources that provided its survival in semiarid.

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Reaction of lima bean accessions to Meloidogyne javanica

Pesquisa Agropecuária Tropical ◽

10.1590/1983-40632018v4849761 ◽

2018 ◽

Vol 48 (1) ◽

pp. 36-42

Author(s):

Francisco Tarcísio Lucena ◽

Fernandes Antonio de Almeida ◽

Gilberto Antonio Torres Junior ◽

Maria Lúcia Tiburtino Leite ◽

Wéverson Lima Fonseca ◽

...

Keyword(s):

Agronomic Traits ◽

Abiotic Factors ◽

Lima Bean ◽

Meloidogyne Javanica ◽

Northeastern Brazil ◽

Resistance Level ◽

Leguminous Plants ◽

Randomized Design ◽

Completely Randomized Design ◽

Productive Development

ABSTRACT Lima bean is one of the most popular leguminous plants in northeastern Brazil, with a strong socioeconomic influence on the regional communities. However, the low yield related to biotic and abiotic factors limits the increase in production. Among the biological agents, root-knot nematodes compromise its vegetative and productive development. In order to select genotypes resistant to Meloidogyne javanica, an experiment was carried out in a greenhouse and in a laboratory, in a completely randomized design, with fifteen lima bean accessions and five replicates. The reaction of lima bean accessions was evaluated through the infectivity and reproduction of M. javanica, as well as the main agronomic traits of the crop. A variation was observed in the resistance level among the accessions, with Lavandeira preta, Orelha de vó and Fava cearense being rated as very resistant, while Lavandeira vermelha was slightly resistant and the remaining accessions were all rated as susceptible.

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Use of space by small mammals in a semiarid area in northeastern Brazil

Animal Biology ◽

10.1163/15707563-00002524 ◽

2017 ◽

Vol 67 (2) ◽

pp. 105-117

Author(s):

Arthur O. Cruz ◽

André F. Mendonça ◽

Adriana Bocchiglieri

Keyword(s):

Population Density ◽

Local Population ◽

Ground Cover ◽

Northeastern Brazil ◽

Semiarid Area ◽

Vertical Leaf ◽

Use Values ◽

Males And Females ◽

The Difference ◽

Selection Of

The use of spool-and-line provides information about the movement, vertical stratification and use of shelters and nests by animals. This study evaluated the area of daily use and selection of microhabitat by the marsupial Gracilinanus agilis and the rodent Wiedomys pyrrhorhinus in northeastern Brazil. The study was conducted using the spool-and-line technique in areas of shrubby arboreal Caatinga and data were obtained on daily use, tortuosity of movement, use of the ground and vertical strata for each individual. The microhabitat was sampled through the ground cover and canopy and the vertical leaf obstruction only during the dry season. A total of 44 trajectories, totaling 2451.42 m, were evaluated. No differences were found in the movement variables between males and females of these species. The species differed only in their use of vertical strata. Gracilinanus agilis showed area of daily use values that were greater than those of W. pyrrhorhinus, and low tortuosity values could be associated with the low local population density of these species. The difference in the use of vertical strata was expected, because G. agilis is known to be a scansorial species while W. pyrrhorhinus is preferably arboreal. The absence of habitat selection suggests that these species may be performing this selection on the scale of mesohabitat.

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Effect of Abiotic Factors on Seasonal Population Dynamics ofLutzomyia longipalpis(Diptera: Psychodidae) in Northeastern Brazil

Journal of Medical Entomology ◽

10.1093/jmedent/43.5.990 ◽

2006 ◽

Vol 43 (5) ◽

pp. 990-995 ◽

Cited By ~ 17

Author(s):

Maria de Fátima Freire de Melo Ximenes ◽

Eloy G. Castellón ◽

Maria de Fátima de Souza ◽

Alexandre A. Lara Menezes ◽

José Wilton Queiroz ◽

...

Keyword(s):

Population Dynamics ◽

Abiotic Factors ◽

Northeastern Brazil ◽

Seasonal Population ◽

Seasonal Population Dynamics

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Structure and composition of Nycteribiidae and Streblidae flies on bats along an environmental gradient in northeastern Brazil

Canadian Journal of Zoology ◽

10.1139/cjz-2018-0098 ◽

2019 ◽

Vol 97 (5) ◽

pp. 409-418 ◽

Cited By ~ 2

Author(s):

Eder Barbier ◽

Gustavo Graciolli ◽

Enrico Bernard

Keyword(s):

Host Species ◽

Environmental Variables ◽

Environmental Gradient ◽

General Pattern ◽

Northeastern Brazil ◽

Common Phenomenon ◽

Vegetation Types ◽

Semiarid Area ◽

Male And Female ◽

Parasitic Load

Bats can be parasitized by several arthropod groups, including ectoparasitic flies. The high host specificity is a common phenomenon between flies and bats. In recent years, more efforts have been employed to understand how environmental variables can influence richness and parasitic load (PL). However, many gaps still need to be filled to better understand this issue. We analyzed the PL of flies on bats sampled in three environments with different rain volume and vegetation types to verify if PL is correlated with rainfall and if there are differences in the PL on bats within and between environments. Overall, there was no correlation between rainfall and PL in the same environment, nor a difference between the three environments. When tested separately, Seba’s short-tailed bats (Carollia perspicillata (Linnaeus, 1758)) had a difference in prevalence of flies between environments and flat-faced fruit-eating bats (Artibeus planirostris (Spix, 1823)) had a greater abundance of flies in the rainy season in a semiarid area. There was no difference in PL between male and female bats. Our results suggest that bat–fly interactions are driven by several factors, not only by the amount of rainfall or vegetation, and that different host species may respond differently with no obvious general pattern.

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