scholarly journals Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)

1989 ◽  
Vol 37 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Anastácio Afonso Juras ◽  
Noriyoshi Yamaguti
Keyword(s):  
Sexual Maturity ◽  
Rio Grande ◽  
Southern Coast ◽  
Rio Grande Do Sul

scholarly journals Acuariidae (Nematoda) in Procellariiformes (Aves) on the southern coast of Rio Grande do Sul, Brazil

2018 ◽  
Vol 27 (1) ◽  
pp. 7-11
Author(s):  
Camila Costa Schramm ◽  
Carolina Silveira Mascarenhas ◽  
Silvia Bainy Gastal ◽  
Simone Scheer ◽  
Gertrud Müller ◽  
...  
Keyword(s):  
Digestive Tract ◽  
Rio Grande ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
Aquatic Birds ◽  
Diomedea Exulans ◽  
Procellaria Aequinoctialis ◽  
Calonectris Borealis ◽  
First Time

Abstract Acuariidae nematodes are normally found in the digestive tract of aquatic birds, including Procellariiformes. Were examined Calonectris borealis (n = 4), Diomedea exulans (n = 1), Macronectes giganteus (n = 8), Thalassarche chlororhynchos (n = 5), Thalassarche melanophrys (n = 15), Procellaria aequinoctialis (n = 4), Puffinus gravis (n = 2) and Puffinus puffinus (n = 6), collected on the southern coast of RS, Brazil. A total of 16 birds (35.5%) were parasitized by two species of Acuariidae. Stegophorus diomedeae and Seuratia shipleyi were identified, with prevalences of 26.1% and 21.7%, respectively. Few studies on nematodes in Procellariiformes have been conducted. Here, the acuariids Seuratia shipleyi in Calonectris borealis and Procellaria aequinoctialis and Stegophorus diomedeae in Diomedea exulans, Procellaria aequinoctialis and Thalassarche chlororhynchos were reported for the first time.

scholarly journals Palaeoenvironmental dynamics of Holocene shoreface bryoliths from the southern coast of Brazil

The Holocene ◽  
2019 ◽  
Vol 29 (4) ◽  
pp. 662-675 ◽  
Author(s):  
Frederico Tapajós de Souza Tâmega ◽  
Paula Spotorno-Oliveira ◽  
Paula Dentzien-Dias ◽  
Francisco Sekiguchi Buchmann ◽  
Leandro Manzoni Vieira ◽  
...  
Keyword(s):  
Human Disturbance ◽  
Rio Grande ◽  
Coralline Algae ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
Benthic Habitats ◽  
Free Living ◽  
Storm Waves ◽  
Water Carbonate ◽  
Shallow Water Carbonate

Beds of free-living coated nodules (coralline algae, bryozoans, acervulinid foraminifera) create shallow-water carbonate biogenic benthic habitats, which are sensitive to human disturbance and slow to recover. Holocene bryoliths, ranging from sub-spheroidal, sub-discoidal to sub-ellipsoidal in shape, were found scattered in the foredunes in ca. 30-km stretch along the Hermenegildo and Concheiros do Albardão beaches on the southernmost coast of Brazil (Santa Vitória do Palmar municipality, Rio Grande do Sul State). The dominating bryozoan species forming the bryolith is Biflustra holocenica Vieira, Spotorno-Oliveira and Tâmega sp. nov. The inner bryolith arrangement, generally asymmetrical, shows multilamellar and circumrotatory growth of colonies that envelop the bivalve Ostrea puelchana. Bryozoans and subordinate corals characterize the outer bryolith surfaces. The ichnogenera Gastrochaenolites (made by the boring bivalve Lithophaga patagonica) and Caulostrepsis occur throughout the bryoliths, from the inner part up to the outer surface. The studied bryoliths, originated in a shoreface setting at ca. 7910–7620 cal. yr BP and during subsequent storm waves, were resedimented onto the foreshore and foredunes (to ca. 5700 cal. yr BP) where the bryoliths were finally fossilized.

Reproduction of the water snake Helicops infrataeniatus (Colubridae) in southern Brazil

2005 ◽  
Vol 26 (4) ◽  
pp. 527-533 ◽  
Author(s):  
Luís Felipe Schmidt de Aguiar ◽  
Marcos Di-Bernardo
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Statistical Difference ◽  
Rio Grande ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Water Snake ◽  
Males And Females ◽  
Two Peaks

AbstractThe reproductive cycle, sexual maturity, fecundity, and sexual dimorphism of Helicops infrataeniatus Jan, 1865, were inferred from the analysis of 374 preserved specimens (110 males, 140 females) from the eastern Central Depression of Rio Grande do Sul, Brazil. There was no statistical difference between the SVL of newborn males and females, but mature females attained greater length than mature males. The tail of mature individuals was proportionally longer in males than in females. Males matured at a smaller size than females. The reproductive cycle of this species was longer than what is known for oviparous colubrids from subtropical and temperate zones of Brazil. In the studied population, vitellogenesis occurred from September to February. Oviductal embryos were found from September to May. Births took place in September, January, February and March, and occurred in two peaks. Litter size ranged from 5 to 22 offspring. The differences between the number of vitellogenic follicles and embryos, and between embryos and newborns were not significant, thus practically all follicles were generally converted into embryos and embryos into newborns.

Reports on the results of the N.Oc. "Prof. W. Besnard" expeditions to the southern coast of Brazil under the Revizee Program: Chirostylidae and Galatheidae (Crustacea: Decapoda: Anomura)

Zootaxa ◽  
2006 ◽  
Vol 1238 (1) ◽  
pp. 1 ◽  
Author(s):  
GUSTAVO A.S. DE MELO-FILHO
Keyword(s):  
Rio De Janeiro ◽  
Rio Grande ◽  
Distribution Patterns ◽  
Exclusive Economic Zone ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
The Family ◽  
Economic Zone

The distribution patterns of the species of the family Chirostylidae and Galatheidae collected under the Revizee Program (Living Resources in the Exclusive Economic Zone) off the Brazilian southern coast are analyzed. The study area extended from the Cape São Tomé (Rio de Janeiro; 22°00’S) south to Chui (Rio Grande do Sul; 34°30’S). The collections were made during several cruises of N.Oc. “Prof. W. Besnard” between December 1997 and April 1998 over the shelf and slope (60–808 m). One species of the genus Agononida, seven species of the genus Munida, one species of Munidopsis and one of Uroptychus were collected.

A new species of Diomedenema (Nematoda, Rhabditida, Spiruromorpha) from Spheniscus magellanicus (Aves, Sphenisciformes) found on the southern coast of Brazil

2017 ◽  
Vol 92 (4) ◽  
pp. 514-519 ◽  
Author(s):  
M. Knoff ◽  
J.N. Santos ◽  
E.G. Giese ◽  
D.C. Gomes ◽  
Â.T. Silva-Souza
Keyword(s):  
New Species ◽  
Rio Grande ◽  
The State ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
First Report ◽  
Spheniscus Magellanicus ◽  
The Third ◽  
Males And Females ◽  
A New Species

AbstractA new species of the genus Diomedenema, a spiruromorph nematode, collected from the lung of Spheniscus magellanicus (Sphenisciformes) found on the southern coast of the state of Rio Grande do Sul, Brazil, is described. The new species is differentiated from the only previously described species of the genus, D. diomedeae Johston & Mawson, 1952, by males possessing a set of caudal papillae with three pairs of precloacal, two pairs of adcloacal and one pair of postcloacal papillae; precloacal papillae with the papillae of the first two pairs being closer to each other than those of the third pair; a longer and pointed tail in males; and females with the vulva at mid-body. This is the first report of a nematode infecting the lung of a sphenisciforme host.

scholarly journals Feather mites of Calidris fuscicollis (Aves: Scolopacidae) in Brazil

2015 ◽  
Vol 75 (4) ◽  
pp. 1027-1029
Author(s):  
S. N. Gomes ◽  
T. C. Pesenti ◽  
M. P. Cirne ◽  
G. Müller
Keyword(s):  
Rio Grande ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
Feather Mites ◽  
First Report

Abstract During the period 2010-2012, eighty individuals of Calidris fuscicollis (Vieillot, 1819) were collected on the southern coast of Rio Grande do Sul, Brazil, with the objective of determining the presence of feather mites. Of the 80 birds examined, 32.5% were infested by mites, identified as Avenzoaria calidridis (Oudemans, 1904) (Avenzoariidae) (31.25%), Montchadskiana securicata (Megnin & Trouessart 1884) (Pterolichidae) (22.5%) and Alloptes limosae (Dubinin, 1951) (Alloptidae) (6.25%). This is the first report of feather mites on Calidris fuscicollis in Brazil

Immunological Profile of the Yellow ClamMesodesma mactroides(Mesodesmatidae) from the Southern Coast of Rio Grande do Sul, Brazil

2016 ◽  
Vol 28 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Juan Jethro Silva Santos ◽  
Yuri Bovi Carvalho ◽  
Diogo Luiz de Alcantara Lopes ◽  
Luis Alberto Romano
Keyword(s):  
Rio Grande ◽  
Southern Coast ◽  
Rio Grande Do Sul ◽  
Immunological Profile

scholarly journals Can weight/length relationship predict size at first maturity? A case study with two species of Characidae

2010 ◽  
Vol 8 (4) ◽  
pp. 835-840 ◽  
Author(s):  
Nelson F. Fontoura ◽  
Anamélia S. Jesus ◽  
Gabriel G. Larre ◽  
Juliana R. Porto
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Rio Grande ◽  
Allometric Growth ◽  
Rio Grande Do Sul ◽  
Power Equation ◽  
Length Relationship ◽  
First Maturity ◽  
Size At First Maturity

A weight/length relationship was established for Astyanax jacuhiensis (Cope, 1894) (n = 370) and Cheirodon ibicuhiensis Eigenmann, 1915 (n = 701), from samples taken monthly in Fortaleza Lagoon, Cidreira, Rio Grande do Sul, from December 1991 through November 1992. Both species showed a polyphasic allometric growth pattern, each stanza described by an independent power equation controlled by a switch function. For C. ibicuhiensis, this change in the growth pattern occurred at 2.948 cm standard length (SL), close to published sizes for the attainment of female maturity. The change in the growth pattern of A. jacuhiensis (SL = 3.481 cm) was below the predicted size at first maturity, and merits further investigation. Although not conclusive, our data suggest that a complex growth pattern is frequent in nature, and perhaps is not usually identified because trends are obscured by natural variability. Despite the increased complexity resulting from the application of a more-complex equation, the identification of a change in the growth pattern could indicate important aspects of fish biology, including the attainment of sexual maturity.

scholarly journals Biology of Hippocampus patagonicus (Syngnathidae) in Brazilian waters. A species threatened with extinction, with suggestions for the conservation of seahorses in Brazil

2020 ◽  
Vol 48 (1) ◽  
pp. 47-57
Author(s):  
Rosana Beatriz Silveira ◽  
José Clebson Da Silva ◽  
Lua Benício ◽  
José Rodrigo Santos Silva
Keyword(s):  
Rio De Janeiro ◽  
Sexual Maturity ◽  
Rio Grande ◽  
Brood Pouch ◽  
Reproductive Age ◽  
Rio Grande Do Sul ◽  
Alternative Strategies ◽  
The Mean

Specimens of Hippocampus patagonicus obtained in the bycatch of trawling in the states of Rio Grande do Sul (RS) and Rio de Janeiro (RJ) were collected in 2012 (n = 199) and 2014 (n = 157), respectively. Mean height of females of reproductive age in RS was 8.89 ± 1.9 cm, with the fecundity of 366 ± 195.8 eggs per clutch, and for males of reproductive age, height was 8.79 ± 1.86 cm and weight 2.3 ± 1.67 g, with 404 ± 99 embryos at each gestation. In RJ, height was 9.69 ± 1.05 cm and weight 2.9 ± 0.9 g, with the fecundity of 277 ± 95.06 eggs per clutch, and for males, height was 10.06 ± 1.02 cm and weight 3.68 ± 1.18 g, with the fecundity of 156.38 ± 66 embryos at each gestation. The equations obtained from the weight (W) to height (H) ratio were: W = 0.002 H3.182, R2= 0.947 (RS males); W = 0.004 H2.914, R2= 0.949 (RS females); W = 0.0050 H2.838, R2= 0.793 (RJ males); W = 0.014 H2.355, R2= 0.733 (RJ females). RS females produced more eggs (P = 0.023), and males incubated more embryos (P = 0.000) than those of RJ. The mean height of brood pouch formation in males was 4.69 ± 0.48 cm, 95% CI [4.53; 4.86], while the mean height at first sexual maturity was 8.34 cm (95% CI [7.481; 9.046]). Alternative strategies need to be developed for the conservation of H. patagonicus in Brazil.

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