Occurrence and abundance of young mullet Mugil liza (Teleostei: Mugilidae) in the surf zone along the southern coast of Brazil

The southern population of Mugil liza is distributed from Argentina (47°S) to the state of São Paulo, Brazil (23°S). Young mullets use the estuaries as nursery grounds, and prior to recruitment into estuaries they use the surf zone as a temporary habitat. Based on 12 consecutive months of sampling, this study used generalized linear models (GLM) to analyse the relationships between environmental variables and the presence and relative abundance of young mullets in the surf zone adjacent to six major estuaries in southern Brazil (between 29°S and 33°S). Young mullets were present in all seasons over the sampling period, but the probability of occurrence was higher in winter and was associated with low temperatures. The water temperature alone explained more than half of the total deviance of the GLM models for presence (23%) and abundance (21%) of young mullets in the surf zone. Site 2 (Rio Grande) had lower temperatures in the colder months, the highest probability of occurrence of all collection sites and the greatest abundance (n=3402) of young M. liza, which represented 52% of the total of individuals (n=6493) caught among the six sites sampled.

Download Full-text

Generalized linear models applied to stranding data of South American sea lions (Otaria flavescens) and South American fur seals (Arctocephalus australis) in southern Brazil

Latin American Journal of Aquatic Mammals ◽

10.5597/lajam00065 ◽

2005 ◽

Vol 4 (1) ◽

Cited By ~ 4

Author(s):

P. G. Kinas ◽

K. G. Silva ◽

S. C. Estima ◽

D. S. Monteiro

Keyword(s):

Generalized Linear Models ◽

Linear Models ◽

South American ◽

Southern Brazil ◽

Otaria Flavescens ◽

Sea Lions ◽

Fur Seals

Download Full-text

Movement distances for four small mammals in two Atlantic forests fragments, Southern Brazil

Neotropical Biology and Conservation ◽

10.3897/neotropical.16.e59669 ◽

2021 ◽

Vol 16 (1) ◽

pp. 11-18

Author(s):

Daniela Oliveira de Lima ◽

Luana Gabriele Arenhart Braun ◽

Fabrício Luiz Skupien ◽

Daniele Pereira Rodrigues ◽

Jady de Oliveira Sausen

Keyword(s):

Body Weight ◽

Generalized Linear Models ◽

Linear Models ◽

Animal Movement ◽

Individual Performance ◽

Southern Brazil ◽

Climatic Effects ◽

Independent Variables ◽

The Mean ◽

Didelphis Albiventris

Animal movement has an important role in individual performance, species reproduction, population demography, and conservation, especially in fragmented landscapes. The distance moved by an individual may vary depending on individual needs, such as the search for food resources and sexual partners. Here we investigated which factors affect the distances between successive captures (hereafter DSC) for Akodon montensis, Oligoryzomys nigripes, Sooretamys angouya, and Didelphis albiventris. This study was conducted from April 2015 to October 2016 in two fragments in the south of Atlantic Forest biome through capture, mark and recapture technique. DSC was analyzed using Generalized Linear Models with Poisson distribution where the independent variables were sex, whether the animal was active or not in terms of reproduction, body weight, and climatic season. The mean DSC was greater for D. albiventris (44.6 ± 28.8 m), followed by S. angouya (31.9 ± 25.7 m), O. nigripes (25.8 ± 22.5 m) and A. montensis (18.9 ± 22.0 m). Males of all species moved larger DSC than females. Considering the rodents, reproductive animals also moved larger DSC than non-reproductive animals. Sex may have masked the effect of body weight, as males tend to be larger than females. Climatic effects were tested for A. montensis and O. nigripes, however, with diverse effects.

Download Full-text

Diversity patterns of aquatic macroinvertebrates in a tropical high-Andean catchment

Revista de Biología Tropical ◽

10.15517/rbt.v68is2.44331 ◽

2020 ◽

Vol 68 (S2) ◽

pp. S29-S53

Author(s):

Rodrigo Espinosa ◽

Patricio Andino ◽

Sophie Cauvy-Fraunié ◽

Olivier Dangles ◽

Dean Jacobsen ◽

...

Keyword(s):

Chlorophyll A ◽

Generalized Linear Models ◽

Current Velocity ◽

Environmental Variables ◽

Linear Models ◽

Macroinvertebrate Communities ◽

Aquatic Macroinvertebrate ◽

Aquatic Macroinvertebrate Communities ◽

Different Water Sources ◽

Site Types

Introduction: Glacierised catchments are remote and hostile environments, in which streams from different water sources (e.g., glacier melt, rain/snowmelt, groundwater) converge, creating a complex mosaic of stream sites with varying levels of glacial influence and environmental conditions. This environmental heterogeneity, in turn, influences the assemblage and composition of aquatic communities and produces complex patterns of species diversity at the catchment scale. Objectives: In this contribution, we assessed biodiversity and community composition of aquatic macroinvertebrate communities from 51 stream site types in a glacierised catchment in the tropical Andes. The aim of our study was to: (1) determine diversity, rarity, commonness and spatial distribution patterns of aquatic macroinvertebrate communities from sites with different water sources, and (2) identify which environmental variables influence the density and presence of macroinvertebrate taxa and, in particular, of the subfamilies of the ubiquitous chironomids. Methods: Our study sites were grouped according to their water source and to their percentage of glacier coverage in the catchment (GCC). At each site we sampled aquatic macroinvertebrates, measured environmental variables and assessed community differences and environmental influence with ordination analyses and generalized linear models. Results: Kryal and mixed sites had an important proportion of rare taxa. Mean richness was highest in the mixed sites and lowest in the sites with the highest glacier cover; while sites with an intermediate percentage of glacier cover, had the highest values of α and β diversity. We found that 13 taxa (15.9%) were common to all stream site types. SIMPER analysis showed that Orthocladiinae, Hyalella sp. and Andesiops sp. contributed the most to the dissimilarity between site types (˃ 45% of cumulative contribution). RDA showed that kryal sites were associated with high turbidity and density of Podonomids, and with low temperature, amount of CPOM and densities of both Anomalocosmoecus sp. and Andesiops sp. Orthocladinae was associated with high current velocity and chlorophyll a concentration, whereas Hyalella sp. had a positive relationship with higher pH and streambed stability. Generalized linear models showed that GCC was the main variable explaining all faunal metrics. Current velocity explained macroinvertebrate abundance, water temperature was related to chironomid density and chlorophyll a influenced Orthocladiinae presence-absence. Conclusions: Our results suggest that by favoring the presence of rare taxa and taxa turnover, glacier influence may increase biodiversity in glacierised catchments. In terms of biodiversity conservation, this study confirms an urgent need to increase knowledge of high-Andean stream biodiversity, especially in highly heterogenous glacierised catchments, to better describe regional biodiversity patterns and community composition of these highly vulnerable freshwater ecosystems. Detailed analyses of benthic communities and development of databases are key for conservation strategies. Water management municipalities and/or enterprises should consider water quality and stream types for more sustainable management of these important ecosystems.

Download Full-text

Assessing surf-zone fish assemblage variability in southern Brazil

Marine and Freshwater Research ◽

10.1071/mf13210 ◽

2015 ◽

Vol 66 (2) ◽

pp. 106 ◽

Cited By ~ 8

Author(s):

Fábio L. Rodrigues ◽

Henrique N. Cabral ◽

João P. Vieira

Keyword(s):

Species Richness ◽

Fish Assemblage ◽

Large Scale ◽

Linear Models ◽

Surf Zone ◽

Poisson Model ◽

Sandy Beaches ◽

Southern Brazil ◽

Beach Seine ◽

Explanatory Variables

Surf-zone fish assemblage was investigated to assess its patterns of variability for two sandy beaches in southern Brazil. Fish were collected monthly (July 2009–June 2011), and the hauls were conducted with two different beach seine nets. Generalized linear models were used in the following two different approaches: (1) a Poisson model was used to assess and compare fish species richness; and (2) a logistic and gamma models were used to explain the occurrence and variability in abundance of Mugil liza and Trachinotus marginatus (dominant species). A set of nine explanatory variables was used to explain the patterns of ecological variability. At a large scale, seven variables explain 24.8% of the variance in species richness; and season (16.2%) and beach seine (3.0%) were the most important. The presence of M. liza was associated with beach seine (20.4%), whereas the abundance was associated with beach seine (12.1%) and five other explanatory variables. The presence and abundance of T. marginatus was associated with season (18.6% and 22.3%, respectively). Species richness seems to be strongly related to season, although the choice of net used can play an important role. Warmer months are richer in number of species, and the larger net is able to catch more species than the smaller one.

Download Full-text

A LPUE (LANDING PER UNIT EFFORT) ANALYSIS OF THE TRAWL FISHERY FOR THE COASTAL SHRIMPS Artemesia longinaris AND Pleoticus muelleri OFF SOUTHERN BRAZIL

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592014061306204 ◽

2014 ◽

Vol 62 (4) ◽

pp. 235-245 ◽

Cited By ~ 1

Author(s):

Cassiana Baptista Metri ◽

José Angel Alvarez Perez

Keyword(s):

Generalized Linear Models ◽

Linear Models ◽

Rio Grande ◽

Southern Brazil ◽

Rio Grande Do Sul ◽

Annual Cycles ◽

Factors Affecting ◽

Trawl Fishery ◽

One Year ◽

Stock Abundance

The Argentine stiletto shrimp (Artemesia longinaris) and the Argentine red shrimp (Pleoticus muelleri) currently sustain an important fishery in terms of tonnage and revenues in southern Brazil. This study analyzed the factors affecting the abundance of both species through the application of Generalized Linear Models to landing-per-unit-of-effort (LPUE) data of the trawl fleet operating on the main fishing grounds between 1998 and 2005. The main patterns of LPUE variability of both species were attributed do the effect of seasons and annual cycles. Larger yields were obtained in the southern shallow areas of Rio Grande do Sul State. No tendency either to an increase or a decline in stock abundance was observed, but the effort in one year was affected by the success of the captures of the previous year. In the last two years analyzed the abundance and the total captures declined.

Download Full-text

From Generalized Linear Models to Neural Networks, and Back

SSRN Electronic Journal ◽

10.2139/ssrn.3491790 ◽

2019 ◽

Cited By ~ 5

Author(s):

Mario V. Wuthrich

Keyword(s):

Neural Networks ◽

Generalized Linear Models ◽

Linear Models

Download Full-text

Effect of Different Dentifrices, Bleaching with 35% Hydrogen Peroxide, and Red Wine on Surface Color and Roughness of Bovine Enamel

Current Dentistry ◽

10.2174/2542579x02999200817112951 ◽

2020 ◽

Vol 02 ◽

Author(s):

RM Garcia ◽

WF Vieira-Junior ◽

JD Theobaldo ◽

NIP Pini ◽

GM Ambrosano ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Generalized Linear Models ◽

Repeated Measures ◽

Red Wine ◽

Linear Models ◽

Artificial Saliva ◽

Surface Color ◽

Dental Bleaching ◽

Surface Alteration ◽

Bovine Enamel

Objective: To evaluate color and roughness of bovine enamel exposed to dentifrices, dental bleaching with 35% hydrogen peroxide (HP), and erosion/staining by red wine. Methods: Bovine enamel blocks were exposed to: artificial saliva (control), Oral-B Pro-Health (stannous fluoride with sodium fluoride, SF), Sensodyne Repair & Protect (bioactive glass, BG), Colgate Pro-Relief (arginine and calcium carbonate, AR), or Chitodent (chitosan, CHI). After toothpaste exposure, half (n=12) of the samples were bleached (35% HP), and the other half were not (n=12). The color (CIE L*a* b*, ΔE), surface roughness (Ra), and scanning electron microscopy were evaluated. Color and roughness were assessed at baseline, post-dentifrice and/or -dental bleaching, and after red wine. The data were subjected to analysis of variance (ANOVA) (ΔE) for repeated measures (Ra), followed by Tukey ́s test. The L*, a*, and b* values were analyzed by generalized linear models (a=0.05). Results: The HP promoted an increase in Ra values; however, the SF, BG, and AR did not enable this alteration. After red wine, all groups apart from SF (unbleached) showed increases in Ra values; SF and AR promoted decreases in L* values; AR demonstrated higher ΔE values, differing from the control; and CHI decreased the L* variation in the unbleached group. Conclusion: Dentifrices did not interfere with bleaching efficacy of 35% HP. However, dentifrices acted as a preventive agent against surface alteration from dental bleaching (BG, SF, and AR) or red wine (SF). Dentifrices can decrease (CHI) or increase (AR and SF) staining by red wine.

Download Full-text

Economic burden of readmission due to postoperative cerebrospinal fluid leak in Chinese patients

Journal of Comparative Effectiveness Research ◽

10.2217/cer-2020-0067 ◽

2020 ◽

Vol 9 (16) ◽

pp. 1105-1115

Author(s):

Shuqing Wu ◽

Xin Cui ◽

Shaoyu Zhang ◽

Wenqi Tian ◽

Jiazhen Liu ◽

...

Keyword(s):

Cerebrospinal Fluid ◽

Generalized Linear Models ◽

Economic Burden ◽

Linear Models ◽

Chinese Patients ◽

Cerebrospinal Fluid Leakage ◽

Index Hospitalization ◽

Real World Data ◽

Factors Associated ◽

Hospitalization Cost

Aim: This real-world data study investigated the economic burden and associated factors of readmissions for cerebrospinal fluid leakage (CSFL) post-cranial, transsphenoidal, or spinal index surgeries. Methods: Costs of CSFL readmissions and index hospitalizations during 2014–2018 were collected. Readmission cost was measured as absolute cost and as percentage of index hospitalization cost. Factors associated with readmission cost were explored using generalized linear models. Results: Readmission cost averaged US$2407–6106, 35–94% of index hospitalization cost. Pharmacy costs were the leading contributor. Generalized linear models showed transsphenoidal index surgery and surgical treatment for CSFL were associated with higher readmission costs. Conclusion: CSFL readmissions are a significant economic burden in China. Factors associated with higher readmission cost should be monitored.

Download Full-text