Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south-west Atlantic

2017 ◽  
Vol 91 (2) ◽  
pp. 443-459 ◽  
Author(s):  
M. F. Martins ◽  
M. C. Oddone
Keyword(s):  
Reproductive Biology ◽  
South West ◽  
South Brazil

scholarly journals Population structure and reproductive biology of Metamysidopsis neritica (Crustacea: Mysidacea) in a sand beach in south Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 403-412 ◽  
Author(s):  
Patrícia Calil ◽  
Carlos A. Borzone
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Direct Relationship ◽  
Surf Zone ◽  
Population Characteristics ◽  
Egg Volume ◽  
Sand Beach ◽  
The World ◽  
Egg Number ◽  
South Brazil

Mysidacea are common sublittoral crustaceans that inhabit all coasts in the world. In this study, the population characteristics and the reproductive biology of Metamysidopsis neritica Bond-Buckup & Tavares, 1992 were studied in the surf zone of a south Brazilian beach (Atami). Mysids were sampled at monthly intervals from August, 1999 to July, 2000 (total of 29,490 individuals). Individuals were classified into six population categories. The highest abundance occurred in May (8,665) and August (6,415), and lowest in September (336) and December (368). Three main generations were identified, namely the summer, fall and winter generations. The winter generation was the longest (four to five months). The fall generation lasted four months, and the summer one extended from three to four months. Ovigerous females occurred throughout the year, with a greater proportion in July. The number of eggs or larvae varied from one to 16. Weak associations were found between female length and egg number, egg volume, and the number of larvae with and without eyes. Egg volume increased during the coldest season, whereas the smallest values were recorded during summer. These results suggest a possible direct relationship between egg volume and generation longevity.

Migration and reproductive biology of Mugil liza (Teleostei: Mugilidae) in south Brazil

2014 ◽  
Vol 85 (3) ◽  
pp. 671-687 ◽  
Author(s):  
V. M. Lemos ◽  
A. S. Varela ◽  
P. R. Schwingel ◽  
J. H. Muelbert ◽  
J. P. Vieira
Keyword(s):  
Reproductive Biology ◽  
South Brazil

Evidence of reward production and pollination by Centris in Encyclia (Orchidaceae: Laeliinae): the reproductive biology of Encyclia mapuerae

2017 ◽  
Vol 65 (3) ◽  
pp. 225 ◽  
Author(s):  
A. H. Krahl ◽  
D. R. P. Krahl ◽  
J. J. Valsko ◽  
A. C. Webber ◽  
E. R. Pansarin
Keyword(s):  
Reproductive Biology ◽  
Nature Reserve ◽  
Single Species ◽  
Wide Distribution ◽  
Natural Conditions ◽  
Floral Reward ◽  
Pollination Mechanisms ◽  
Central Amazonia ◽  
Conclusive Data ◽  
South Brazil

Encyclia is a neotropical orchid genus distributed from Florida to South Brazil and comprises ~120 taxa, including Encyclia mapuerae (Huber) Brade & Pabst. Besides its diversity and wide distribution, conclusive data on pollinators and reproductive biology of this orchid genus is scarce. Furthermore, nothing is known about the production of floral reward in Encyclia but the pollinators of their species are assumed to be attracted through food deception. Based on data on phenology, floral morpho-anatomy, histochemistry, pollinators, pollination mechanisms, and breeding system, the reproductive biology of E. mapuerae was studied in a nature reserve at Central Amazonia, Brazil. The flowers of E. mapuerae show longitudinal lines on the labellum that act as a nectar guide. The secretory epidermis has papillae whose cells are covered by an ornamented cuticle. The subtended tissue is composed of a tree-layered collenchyma. The flowers attract several species of Hymenoptera. However, a single species of Centris was recorded as pollinator. The bees collect the nectar produced inside the cuniculus. When the bees leave the flower the pollinarium is attached to their heads. Encyclia mapuerae is self-compatible and pollinator-dependent. The reproductive success in natural conditions is low because of deficient pollen transference due to the scarcity of pollinators. As far we know this is the first study that reports and production of floral reward in Encyclia. This discovery provides new insights on the function of the cuniculus in Laeliinae, and sheds light on the evolution of floral rewards and pollination mechanisms within this diverse group of Neotropical orchids.

scholarly journals Reproductive Dynamics ofSterna hirundinaceaLesson, 1831 in Ilha dos Cardos, Santa Catarina, Brazil

Scientifica ◽  
2014 ◽  
Vol 2014 ◽  
pp. 1-16
Author(s):  
Hélio Augusto Alves Fracasso ◽  
Joaquim Olinto Branco ◽  
Márcio Amorim Efe ◽  
João Pedro Barreiros
Keyword(s):  
Reproductive Success ◽  
Reproductive Biology ◽  
Natural Environment ◽  
Basic Equation ◽  
Breeding Site ◽  
Southern Brazil ◽  
Stages Of Development ◽  
Santa Catarina ◽  
Larus Dominicanus ◽  
South Brazil

In this work, we intend to describe the reproductive dynamics ofSterna hirundinaceain an island from South Brazil. We studied the reproductive biology of this species in its natural environment and provide data on their growth, survival, and reproductive success in Ilha dos Cardos, Santa Catarina, South Brazil. Samplings were carried out daily on the island throughout the reproductive seasons of 2003, 2005, and 2006 and the different stages of development of the chicks were characterized according to age, length of the beak, and plumage characteristics. We provide a basic equationLm=167.91 (1-e-0.062t--0.23)to determine the approximate age of individuals using their body mass. The main cause of chick mortality on the island was natural (63.17% in 2003, 81.41% in 2005, and 79.96% in 2006), whereas predation contributed to mortality in a proportion of 38.83% in 2003, 18.59% in 2005, and 20.04% in 2006. The absence in the area of the chicks’ main predator, Kelp gull (Larus dominicanus), the large number of chicks that reached the final stages of development, and their reproductive success demonstrate that Ilha dos Cardos is an important breeding site for the species in southern Brazil.

Reproductive biology of the endemic skate Psammobatis lentiginosa in the San Matías Gulf (south-western Atlantic)

2010 ◽  
Vol 91 (6) ◽  
pp. 1165-1173 ◽  
Author(s):  
Raquel Perier ◽  
Marilú Estalles ◽  
Marina Coller ◽  
Edgardo E. Di Giacomo
Keyword(s):  
Reproductive Biology ◽  
First Record ◽  
Distribution Area ◽  
Western Atlantic ◽  
North Patagonia ◽  
Total Length ◽  
South West ◽  
The Mean ◽  
Continuous Presence ◽  
Reproductive Aggregation

The reproductive biology of Psammobatis lentiginosa was studied in San Matías Gulf (Patagonia, south-west Atlantic). A total of 1033 skates was analysed, total length ranged from 17 to 52 cm for females and from 13 to 55 cm for males. Total length–total weights relationships differed between sexes, with TW = 0.005 × TL3.02 for females and TW = 0.005 × TL2.97 for males. The overall sex-ratio was 1:1. In females, the L50% was 41.06 cm, in males the L50% was 41.38 cm. The mean number of yolked oocytes per skate was 4.22 (±2.41). The mean number of yolked oocytes and the length of the female were linearly related. The diameter maximum of yolked oocytes was 24 mm. The species exhibited a continuous reproductive cycle throughout the year, with a peak of egg-case production during autumn that was synchronous with maximum values of the epididymis and uterus indices. This is the first record of a reproductive aggregation for P. lentiginosa in San Matías Gulf, North Patagonia. This finding together with its continuous presence around the year, suggest that this area is the main distribution area of P. lentiginosa in the south-west Atlantic.

scholarly journals Fishery, diet composition and reproductive biology of the dolphinfish Coryphaena hippurus (Linnaeus, 1758) off Karnataka, south-west coast of India

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
K. M. Rajesh ◽  
Prathibha Rohit ◽  
E. M. Abdussamad
Keyword(s):  
Reproductive Biology ◽  
Diet Composition ◽  
Gradual Increase ◽  
Gonadosomatic Index ◽  
Fork Length ◽  
Spawning Period ◽  
Coryphaena Hippurus ◽  
South West ◽  
South West Coast ◽  
Index Of Relative Importance

Fishery, diet composition and reproductive biology of the dolphinfish Coryphaena hippurus (Linnaeus, 1758) landed along Karnataka Coast during 2013-15 were studied. The estimated average landing of the species in India during the study period was 7975 t of which Karnataka contributed 2.73% (218 t). The fish is mainly exploited by gillnet and also by troll lines operated from trawlers. A few stray specimens were also landed by purse seines. The fork length (FL) was in the range of 32-128 cm and fishes in the length range (FL) of 55-90 cm dominated the catch, contributing 79.8% of the total landings. The most dominant prey item, in terms of occurrence (70.57%) and weight (83.18%) were finfishes followed by cephalopods (19.62% by occurrence and 13.66% by weight) and crustaceans (7.01% occurrence and 1.32% by weight). The index of relative importance (IRI ) values were 85.3, 13.39 and 0.68% respectively for fish, cephalopods and crustaceans respectively. Sex ratio (1:2.05) indicated dominance of females in the fishery. Presence of mature and spent specimens throughout the year suggests that the species spawns all through the year. Peak spawning period was from June to September. This coincided with gradual increase in gonadosomatic index (GSI) values ahead of May which reached a peak during August-September.

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