SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Estrategia reproductiva de la saraca, Brazilian menhaden, Brevoortia aurea (Pisces: Clupeidae), en el estuario del Río de la Plata

Gaitán, E.N..

In zones of high productivity and/or in shallow waters (frontal or upwellings areas, bays and estuaries) the hydromedusae can reach exceptional abundances, denominated 'blooms'. Occasionally, these exceptional abundances are originated from some few individuals that constitute a 'seed population', which is retained in particular places while the environmental conditions are adverse. Liriope tetraphylla is a holoplanktonic and oceanic hydromedusae that often is found forming dense aggregations, which are developed mainly in the Buenos Aires coast during the summer in Argentinian waters (SW Atlantic). The temporal-space distribution and the abundance of L. Tetraphylla in the Subantarctic region were analyzed, with 1458 samples embracing the Argentinian and...

Tipo: Theses and Dissertations

Palavras-chave: Ecological aggregations; Geographical distribution; Abundance; Seasonal variations; Life history.

Ano: 2004

URL: http://hdl.handle.net/1834/5029

Moluscos bivalvos y gasteropodos

Acha, E.M..

The Brazilian menhaden, Brevoortia aurea, is the only species of genus Brevoortia in South American Atlantic waters, being abundant in the Rio de la Plata estuary. The temporal and spatial reproductive pattern of this menhaden was analyzed in relation to the major hydrographic features of the region, and the reproductive biology was studied by using histological analysis of ovaries. B.aurea is a multiple spawner with indeterminate annual fecundity. Daily spawning activity was mostly in the afternoon (15:00 - 16:00),based on the incidence of females with both hydrated oocytes and postovulatory follicles. Spawning frequency, determined using the percentage of females with postovulatory follicles, was about 12. during November. At this frequency, each...

Tipo: Theses and Dissertations

Ano: 1999

URL: http://hdl.handle.net/1834/1458

Historia de vida y dinámica de poblaciones de Lychnorhiza lucerna (Scyphozoa) ¿Un recurso pesquero alternativo?

Lasta, M.L.; Ciocco, N.F.; Bremec, C.; Roux, A..

The main life history characteristics, ecology and fishing interest of bivalve and gastropod species from the Argentine Sea are described. Exploited bivalve species are: mussel Mytilus edulis platensis, cholga Aulacomya ater, tehuelche scallop Aequipecten tehuelchus, Patagonian scallop Zygochlamys patagonica. Bivalve species irregularly exploited are: yellow clam Mesodesma mactroides, purple clam Amiantis purpurata, hard shell clam Ameghinomya antiqua and wedge shell Donax hanleyanus. It is also presented information on species of potential interest: clams Eurhomalea exhalbida and Pitar rostratus, half naked pen shell Atrina seminuda, 'geoduck' Panopea abbreviata, razor shells Solen tehuelchus, Ensis macha, Tagelus plebeius, and flat oyster Ostrea...

Tipo: Book Section

Palavras-chave: Marine molluscs; Potential resources; Life history; Ecology; Geographical distribution; Literature reviews; Life history; Ecology; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_12170; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5083.

Ano: 1998

URL: http://hdl.handle.net/1834/2582

Early Iron Working People's Adaptation to the Nearshore and Offshore Island Environment

Schiariti, A..

In this Thesis we presented the first steps in the study of the life history and population dynamics of Lychnorhiza lucerna as well as the possibilities of development of its fishery in Argentina. L. lucerna presented a metagenetic life cycle characteristic of most scyphozoans. Polyps reproduced asexually by the production of podocysts and polidisk strobilation. The combination of both types of asexual reproduction resulted in a high strobilation rates indicating that the abundance of medusae would strongly depend on polyps abundance and reproduction. The absence of ephyrae in the Río de la Plata estuary suggest that L. lucerna doest not complete its life cycle locally but medusae would be produced by polyps located northwards along the Uruguayan or...

Tipo: Theses and Dissertations

Palavras-chave: Life cycle; Life history; Population dynamics; Reproductive cycle; Biomass; Estuarine fisheries; Life history; Biomass; Estuarine fisheries; Life cycle; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_12170; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2674; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6111.

Ano: 2008

URL: http://hdl.handle.net/1834/3109

Microestructura de los otolitos Sagittae de larvas y juveniles de Merluccius hubbsi (Marini 1933): análisis comparativo entre las áreas de distribución bonaerense y norpatagónica

Chami, F..

Tanzanian researchers of the on-going SAREC/Sida-sponsored project on Human Responses and Contribution to Environmental Change (HRAC) have focused their research on a narrow strip of the central coast of Tanzania. The area under investigation is specifically between Kisiju to the north and the Rufiji Delta to the south. Survey work was also extended to the off-shore islands including Kwale, Koma and Mafia. The preliminary intention was to look for sites that could provide light to the whole question of environmental change and its human contribution.

Tipo: Journal Contribution

Palavras-chave: Environments; Life history.

Ano: 1998

URL: http://hdl.handle.net/1834/278

Critique of some practices in life-history studies, with special references to harpacticoid copepods

Buratti, C.C..

The life history of numerous aquatic organisms involves a pelagic larval stage, followed by a shift to a demersal or benthic existence (settlement) in the juvenile and adult stage. This transition and ecological, physiological and morphological changes frequently remain recorded like checks or marks in fish otoliths. As a contribution to the knowledge of hake (Merluccius hubbsi)life history, sagittae otoliths of larvae and juveniles with total length between 19 and 190 mm inhabiting North Patagonian and Bonaerensis waters in the Argentine sea (SW Atlantic)were analyzed. Using an image analysis system, otoliths microstructure was described and comparisons between left and right otoliths and between study areas in the following variables were realized:...

Tipo: Theses and Dissertations

Palavras-chave: Fish larvae; Juveniles; Otolith reading; Otoliths; Larval settlement; Life history; Otoliths; Life history; Fish larvae; Juveniles.

Ano: 2003

URL: http://hdl.handle.net/1834/3108

Bergmans, M..

Published studies on the demography and reproductive strategies of harpacticoid copepods are examined critically. At the technical level, the popular approximation r = ln R0/Tc is shown to be inappropriate as an estimate of the intrinsic rate of increase of harpacticoids. It leads to a systematic underestimation, by 8-29%, for life histories typical of fast-breeding species. Various ad hoc variants of r and R0 calculations occurring in the literature are also criticized. At the conceptual level, a more discriminating approach to life-history characteristics is necessary; this applies both to the assessment of...

Studies of the life-history and energetics of marine and brackish-water nematodes: 2. Production, respiration and food uptake by Monhystera disjuncta

Palavras-chave: Life history; Copepoda [copepods].

Ano: 1984

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3311

Herman, P.M.J.; Vranken, G..

An energy budget was constructed for the marine nematode Monhystera disjuncta. Respiration was measured with a modified Cartesian diver technique, in which the nematodes were kept in agar inside the diver 'head'. The relationship between respiration and body weight was: R=1.53 W0.75. Body growth was exponential during the juvenile phase, with a growth rate equal to 0.61 d-1. After maturation the growth rate fell to 0,17 d-1. Food uptake was measured in experiments with radiolabeled bacteria. In one series of experiments the accumulation of radiolabel in the nematodes was followed. In a second series the decrease in labeling was followed when pre-labeled nematodes fed on...

Kennen Sie die Lebensgeschichte von Artemia salina?

Palavras-chave: Bioenergetics; Brackishwater environment; Energy budget; Energy flow; Feeding; Life history; Meiobenthos; Respiration; Monhystera disjuncta; Nematoda [Nematodes].

Ano: 1988

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3146

Sorgeloos, P.; Persoone, G..

Studies of the life-history and energetics of marine and brackish-water nematodes: 1. Demography of Monhystera disjuncta at different temperature and feeding conditions

Palavras-chave: Life history; Artemia salina.

Ano: 1972

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3437

Vranken, G.; Herman, P.M.J.; Heip, C.H.R..

Aspects of the demography of Monhystera disjuncta were investigated at different feeding conditions (monoxenic cultures with different bacterial strains, and different densities in the feeding suspension with one strain). Embryonic development time, minimum generation time, egg deposition rate and adult longevity depend on temperature, quality and quantity of food offered. Body mass at maturity is an allometric function of food density. It is shown that a previously inferred selectivity in food uptake is an artifact of culture conditions. pH buffering and addition of sterols permit culture of the species on a wide variety of bacterial strains. M. disjuncta is less well adapted to take advantage of high food density...

The multifunctionality of agriculture and risk management as seen by Hungarian farmers involved in diversified farming

Palavras-chave: Bioenergetics; Brackishwater environment; Cultured organisms; Feeding; Life history; Marine environment; Meiobenthos; Temperature effects; Water temperature; Monhystera disjuncta.

Ano: 1988

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3159

AgEcon

Petrics, Hajnalka; Feher, Alajos.

Studying the multifunctional nature of agriculture requires a multi-level, multi-dimensional and multi-actor approach. In any given country analysis starts at the national economy level then descends to the farm and farm household level. In our study we analysed the life histories of nineteen non-representatively selected Hungarian family farms. In doing so, we determined that, to understand new initiatives undertaken by farmers, it was better to examine their motivation than merely examining the initiatives themselves. At the farm household level, multifunctionality is strongly related to achieving livelihood strategies and constitutes a possible risk management solution. The analysis has revealed farmers’ motivations for undertaking multifunctional...

Tipo: Journal Article

Palavras-chave: Multifunctional agriculture; Rural economy; Risk management; Farmers’ motivation; Life history; Agricultural and Food Policy; Community/Rural/Urban Development; Institutional and Behavioral Economics; Risk and Uncertainty.

Ano: 2009

URL: http://purl.umn.edu/49196

Histórico de vida de espécimens selvagens e variantes cromáticas de Gracilaria birdiae (Gracilariales, Rhodophyta)

Rev. Bras. Bot.

VIVIANE L.,COSTA; PLASTINO,ESTELA M..

(Gracilariales, Rhodophyta) é uma macroalga marinha de coloração vermelha (vm) comum na costa Nordeste do Brasil e amplamente coletada para a extração de ágar. O objetivo deste estudo foi completar o histórico de vida de espécimens selvagens (coloração vermelha) e variantes cromáticas. Duas variantes foram isoladas, além dos espécimens selvagens coletados na praia de Paracuru, Ceará: i, marrom-esverdeada (me), encontrada em uma população natural da praia de Paracuru; e ii, verde (vd), obtida espontaneamente in vitro a partir de um ramo tetrasporofítico. As condições gerais de cultivo tanto para gametófitos quanto para tetrasporófitos foram: meio de cultura von Stosch 25%; fotoperíodo 14L:10E (luz: escuro); irradiância 100 µm.m-2.s-1 e aeração a cada 30...

Mimosa splendida Barneby (Mimosoideae, Leguminosae) rediscovered in Central Brazil: preliminary studies for conservation of a rare species

Palavras-chave: Gracilaria; Life history; Chromatic variants; Reproduction.

Ano: 2001

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500003

Rev. Bras. Bot.

Simon,Marcelo F.; Amaral,Marina F..

The poorly known Mimosa splendida Barneby has been rediscovered in the Chapada dos Veadeiros, Brazil, 105 years after its single record in 1895. Data on its habitat description, demography, reproductive parameters, and geographic range are presented. Preliminary results suggest that the rarity of M. splendida in herbarium collections is associated with a narrow geographic range, and a specialized habitat preference on rocky slopes.

Life cycle of Poratia salvator (Diplopoda: Polydesmida: Pyrgodesmidae)

Palavras-chave: Cerrado; Chapada dos Veadeiros; Demography; Endemism; Life history.

Ano: 2003

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000100010

Pinheiro,Tamaris G.; Marques,Marinêz I.; Battirola,Leandro D..

Even though millipedes display high plasticity in their reproductive strategies, they are poorly studied in the tropical region. The present study describes the biological cycle and reports the parthenogenetic reproduction of Poratia salvator Golovatch & Sierwald, 2000 under environmental conditions. Collections were carried out in Pantanal of Mato Grosso and in Várzea Grande, state of Mato Grosso, Brazil. The individuals were kept at room temperature in individual plastic pots. All 18 females used in the experiment reproduced parthenogenetically, resulting in a total of 699 young individuals. Of these, 18% survived until the adult phase. The lowest survival rate of P. salvator was recorded for the first developmental stage (46%). The mean duration...

Biologia e tabela de vida de Tetranychus desertorum (Acari: Tetranychidae) sobre folhas de feijão (Phaseolus vulgaris)

Palavras-chave: Brazil; Life history; Mato Grosso; Millipedes; Parthenogenesis; Reproduction.

Ano: 2009

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400010

Rivero,Edgar; Vásquez,Carlos.

Biological aspects and life table of the red spider mite, Tetranychus desertorum Banks, 1900, were studied on leaf discs of kidney bean (Phaseolus vulgaris Linnaeus) cultivar "Tacarigua" under laboratory conditions (28 ± 2ºC, 70 ± 10% R.H. and 12:12h). Our results showed that total developmental time was 6.8 days for females, with partial duration of immature stages corresponding to 3.8, 1.4, 1.0 and 0.7 for egg, larva, protonymph and deutonymph, respectively. Preoviposition, oviposition and postoviposition periods were 1.1, 8.4 and 1.3 days, respectively; and the higher mean fecundity (6.93 eggs/female/day) was observed on day 4. Female mean longevity was 10 days. The life table parameters recorded were: net reproduction rate (Ro) = 41.10 individuals;...

Length-based estimates of growth parameters and mortality rates of fish populations from a coastal zone in the Southeastern Brazil

Palavras-chave: Fecundity; Life history; Red spider mite; Tetranychid.

Ano: 2009

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100007

Costa,Marcus Rodrigues da; Tubino,Rafael de Almeida; Monteiro-Neto,Cassiano.

ABSTRACT Small-scale fisheries in Brazil contribute to a significant share of total fish production, accessing a large variety of species. Life history parameters from these resources are important for their management and conservation, based on primary data. The objective of this article is to generate growth parameters and mortality rates of ten fish populations from a coastal zone in Southeastern Brazil. Monthly samples were taken between January 2011 and November 2014 from landings of the beach-seine fishery in an area adjacent to the entrance of the Guanabara Bay. All fishes were measured (total length) and weighed. The length-weight relationships (LWR) were estimated by linear regression analysis on log-transformed data of the equation: W = aL b ....

Breeding biology of Tyrannus melancholicus (Aves: Tyrannidae) in a restinga reserve of southeastern Brazil

Palavras-chave: Ichthyofauna; Length-weight relationships; Life history; Shallow waters; Small-scale fisheries.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100343

Daros,Hermes; Dutra,William Barbosa; Duca,Charles.

ABSTRACT Existing knowledge of the breeding success and life history characteristics of most Neotropical bird species is scarce. Here, we help fill this gap by analyzing aspects of the breeding biology of the Tropical Kingbird Tyrannus melancholicus (Vieillot, 1819), which is a good model for this kind of study as it is a common species occurring in various environments, including urban areas, but little is known about its life history. We provide results concerning the breeding period, clutch size, incubation and nestling periods, description of nests, eggs and nestlings, and the plants used for nest sites by this species. Fifty-four nests were monitored over two seasons (2012-2014) in a protected area in southeastern Brazil. Nesting began at the end of...

Latitudinal disparity in the reproductive cycle of sharpnose shark, Rhizoprionodon lalandii (Elasmobranchii: Carcharhinidae), in Atlantic waters off South America

Palavras-chave: Atlantic Forest; Breeding season; Clutch size; Life history; Tropical Kingbird.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100308

Macedo,Morgana M.; Sousa,Marcia F.; Batista,Vandick S..

Geographical variation in biophysical conditions may strongly influence the life history characteristics of widely distributed species, such as the Brazilian sharpnose shark, Rhizoprionodon lalandii (Müller & Henle, 1839). Here, we use original and secondary data of reproductive traits of R. lalandii to identify population differences among northern/northeastern and southern Atlantic waters of South America. In the southeast region, birth occurs between December and March, and the young become frequent along the coast between April and September. Mating occurs mainly between March and June, when females with bite marks are common. Females in early pregnancy occur between March and September. The reproductive cycle of R. lalandii in the...

Development of Myrmeleon brasiliensis (Navás) (Neuroptera, Myrmeleontidae), in laboratory, with different natural diets

Palavras-chave: Coastal waters; Life history; Reproductive traits; Northeastern Brazil.

Ano: 2012

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000500004

Zoologia

Missirian,Giani L. B.; Uchôa-Fernandes,Manoel A.; Fischer,Erich.

Antlions larvae are sit-and-wait predators that capture arthropod prey in conical sand pits. The aim of this paper were to determine the effect of different natural diets [leaf-cutting ants (Atta spp.), fruit fly larvae (Anastrepha spp. and Ceratitis capitata) and mixed diet (Atta spp. plus fruit fly larvae)] on the development of larvae and pupae of M. brasiliensis (Navás, 1914) and to estimate the number and size of prey caught in each instar and on each kind of diet. The average duration (days) of the second and third instars of M. brasiliensis was longer when larvae of antlion were fed with leaf-cutting ants. The diets did not affect the duration of the pupal stage nor the pupae size. The different diets did not affect the mean width of head capsule...