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Registros recuperados: 83
Primeira ... 12345 ... Última
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Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907. OceanDocs
Giussi, A.R..
Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of...
Tipo: Theses and Dissertations Palavras-chave: Life cycle; Growth; Otoliths; Age determination; Reproduction; Population dynamics; Mortality; Population structure; Fishery surveys; Fishing grounds; Geographical distribution; Back calculation; Growth; Otoliths; Age determination; Population structure; Geographical distribution; Life cycle; Reproduction; Population dynamics; Mortality; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996 URL: http://hdl.handle.net/1834/1488
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Características ecológicas del pulpito Octopus Tehuelchus en tres ambientes del golfo San Matías OceanDocs
Storero, L.P..
Coastal marine ecosystems are highly variable and the inherent biotic and abiotic factors of these environments can influence the bio-ecological characteristics of the living cephalopods. The presence of the small octopus “pulpito” Octopus tehuelchus in the coastal environments of San Matías Gulf has been exploited by artisanal fishermen for more than 60 years. The aim of this study is to evaluate the variations in the life cycle of the pulpito, and the factors that could account for these variations in three different coastal environments of San Matías Gulf, with differences in the physical, ecological and fisheries characteristics. This study was developed in San Antonio bay, El Fuerte and Islote Lobos. Monthly samplings (October 2005-2007) in the...
Tipo: Theses and Dissertations Palavras-chave: Fishery biology; Cephalopod fisheries; Artisanal fishing; Coastal zone management; Coastal environment; Environmental conditions; Population dynamics; Sex composition; Spatial distribution; Morphology (animal); Life cycle; Feeding; Size-at-first-maturity; Age determination; Growth; Reproduction; Reproductive behaviour.
Ano: 2010 URL: http://hdl.handle.net/1834/5023
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Efecto de la salinidad y la temperatura sobre el ciclo de vida de cangrejos estuariales (Decapoda, Grapsidae). OceanDocs
Bas, C..
El ciclo de vida de los cangrejos verdaderos (Crustacea, Brachyura) incluye en la mayoria de los casos cuatro etapas. Una etapa embrionaria, en la cual los huevos en desarrollo protegidos por una membrana de varias capas, se mantienen adheridos a los ple6podas de la hembra, expuestos a las mismas condiciones ambientales que el adulto . Posteriormente una etapa larval planct6nica y finalmente una fase juvenil y una adulta, ambas bent6nicas en igual o diferente ambiente . Muy frecuentemente [as historias de vida de los organismos son referidas como rigidamente definidas para cada especie, sin embargo existen numerosos ejemplos en invertebrados donde las caracteristicas del desarrollo y la reproducci6n de una especie son ampliamente influenciadas y...
Tipo: Theses and Dissertations Palavras-chave: Salinity effects; Temperature effects; Life cycle; Comparative studies; Larval development; Embryonic development; Feeding; Reproduction; Seasonal variations; Feeding; Embryonic development; Life cycle; Reproduction; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2545; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 2001 URL: http://hdl.handle.net/1834/2972
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Historia de vida y dinámica de poblaciones de Lychnorhiza lucerna (Scyphozoa) ¿Un recurso pesquero alternativo? OceanDocs
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
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The life cycle of <i>Anguillicola crassus</i> OMA
De Charleroy, D.; Grisez, L.; Thomas, K.; Belpaire, C.; Ollevier, F.P..
For some years now the parasitic swim bladder nematode <i>Anguillicola crassus</i> of the European eel <i>Anguilla anguilla</i> L., has been reported from several European countries. The entire life history of this parasite has recently been elucidated in our laboratory. Young larvae leave the swim bladder of the host via the pneumatic duct and reach the water through the digestive tract. They are ingested by small copepods (Cyclopoida), which act as intermediate hosts. Larvae remain in the hemocoel until the copepods are eaten by the final host, the European eel. Larvae penetrate through the intestinal wall and reach the swim bladder where they develop into adults. When infected copepods are eaten by other small fish, such as carp...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological vectors; Disease transmission; Fish diseases; Food chains; Freshwater fish; Hosts; Life cycle; Parasites; Parasitic diseases; Predation; Predators; Swim bladder; Anguillicola crassus.
Ano: 1990 URL: http://www.vliz.be/imisdocs/publications/3074.pdf
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Notes on the life-cycle of <i>Deropristis inflata</i> (Molin, 1885)? (Trematoda Digenea: Acanthocolpidae): transmission between first and second intermediate host OMA
Vaes, M..
Information is presented concerning the transmission from <i>Hydrobia stagnorum</i> (first intermediate host) to <i>Nereis diversicolor</i> (second intermediate host) of a species attributed provisionally to <i>Deropristis inflata</i>.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hosts; Life cycle; Parasites; Deropristis inflata.
Ano: 1978 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3589
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Seed bank modelling of volunteer oil seed rape: from seeds fate in the soil to seedling emergence Planta Daninha
Soltani,E.; Soltani,A.; Galeshi,S.; Ghaderi-Far,F.; Zeinali,E..
Studies were conducted to estimate parameters and relationships associated with sub-processes in soil seed banks of oilseed rape in Gorgan, Iran. After one month of burial, seed viability decreased to 39%, with a slope of 2.03% per day, and subsequently decreased with a lower slope of 0.01 until 365 days following burial in the soil. Germinability remained at its highest value in autumn and winter and decreased from spring to the last month of summer. Non-dormant seeds of volunteer oilseed rape did not germinate at temperatures lower than 3.8 ºC and a water potential of -1.4 MPa ºd. The hydrothermal values were 36.2 and 42.9 MPa ºd for sub- and supra-optimal temperatures, respectively. Quantification of seed emergence as influenced by burial depth was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Life cycle; Seed survival; Dormancy cycle; Hydrothermal time model; Burial depth.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200004
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Succession Decisions in U.S. Family Farm Businesses AgEcon
Mishra, Ashok K.; El-Osta, Hisham S.; Shaik, Saleem.
Farm transfer or succession by the “next generation” holds a place of central importance in the determination of industry structure and total number of farmers and has profound implications for farm families. The family farm sector relies heavily on intergenerational succession. Succession and retirement are linked and reflective of the life cycles of the farm household and the farm business. A large farm-level data set and a logistic regression model were used to examine the determinants of farm succession decisions in the United States, with special emphasis given to the treatment of endogenous wealth and farm size variables. Results point to the importance of farmer’s age, educational attainment of farm operators, off-farm work by the operator or...
Tipo: Journal Article Palavras-chave: Education; Endogeneity; Farm household wealth; Farm transfer; Household income; Intergenerational succession; Life cycle; Logit model; Off-farm work; Farm Management; Labor and Human Capital.
Ano: 2010 URL: http://purl.umn.edu/61055
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Dimensions of Wealth Dispersion Among Farm Operator Households: An Assessment of the Impact of Farm Subsidies AgEcon
El-Osta, Hisham S.; Mishra, Ashok K..
This paper uses microlevel data from the Agricultural Resource Management Survey to examine the changes in the distributions of household wealth and to assess the role farm subsidies play, among other factors, in affecting these distributions. The empirical analysis relies on the concept of the adjusted Gini coefficient and on fixed-effect regression procedures. Coefficients from fixed-effect estimation indicate a negative correlation between government payments and wealth dispersion, with the effect shifting toward more of a positive relation when government payments were allowed to interact with regional dummies.
Tipo: Journal Article Palavras-chave: Adjusted Gini coefficient; Agricultural Resource Management Survey; Fixed-effects regression; Government subsidies; Life cycle; Wealth dispersion; Environmental Economics and Policy; Farm Management; Livestock Production/Industries; Production Economics; C33; D31; D63; O18; Q15.
Ano: 2005 URL: http://purl.umn.edu/43733
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Biologia de Neotrioza tavaresi Crawford, 1925 (Hemiptera, Psyllidae), galhador da folha do araçazeiro (Psidium cattleianum) Rev. Bras. entomol.
Butignol,C. A.; Pedrosa-Macedo,J. H..
Biology of the leaf gall inducer Neotrioza tavaresi Crawford, 1925 (Hemiptera, Psyllidae) on strawberry guava tree (Psidium cattleianum). A field study was conducted in Curitiba region, State of Paraná, southern Brazil, to describe the life cycle of Neotrioza tavaresi Crawford, 1925, a leaf galling insect in strawberry guava trees (Psidium cattleianum). Three cycles were observed (1997, 1998, 1999) during regular field trips and the insects were observed in Piraquara municipality, where 15 samples with 50 infested leaves were sampled in the 1997-98 cycle. Galls were dissected for detailed studies. Neotrioza tavaresi has a univoltine cycle in which adult individuals were found inside the galls from August onwards. The sexually mature insects with sex ratio...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insect/plant relationship; Life cycle; Natural enemies; Psyllidae.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262003000100001
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Biology and management of the masked chafer Cyclocephala distincta Burmeister (Melolonthidae, Dynastinae, Cyclocephalini) Rev. Bras. entomol.
Souza,Thamyrys B.; Maia,Artur C.D.; Albuquerque,Cleide M.R.; Iannuzzi,Luciana.
Adults of Cyclocephala distincta are flower visitors of Neotropical palms (Arecaceae) and commonly found in the Atlantic Forest of Pernambuco, Brazil. Males and females were collected in the wild and subjected to captive rearing and breeding. The egg hatching rate, the life cycle, longevity of immatures and adults, and oviposition parameters in captivity were analyzed. The average duration of the life cycle of C. distinctawas 108.2 days (n = 45). The egg stage lasted on average 10.9 days, and the egg-hatching rate was 73.9%. The immature stage lasted on average 93.4 days. The larvae stage exhibited negative phototaxis, and the size of their head capsules increased at a constant rate of 1.6 between instars, following Dyar's rule. The average duration of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Life cycle; Rearing; Thanatosis.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262015000100037
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Immature stages of Hamadryas fornax fornax (Hübner) (Lepidoptera: Nymphalidae: Biblidinae) Rev. Bras. entomol.
Salik,Lucy Mila Garcia; Leite,Luis Anderson Ribeiro; Dias,Fernando Maia Silva; Casagrande,Mirna Martins; Mielke,Olaf Hermann Hendrik.
ABSTRACT The external morphology and biology of the immature stages of Hamadryas fornax fornax (Hübner, [1823]) (Lepidoptera, Nymphalidae, Biblidinae) recorded on Dalechampia triphylla (Euphorbiaceae) in Curitiba, Paraná, Brazil are described. Morphological characters are illustrated and described, as a result of observations in scanning electron, stereoscope and optical microscopes, the last two attached to a camera lucida. Results are compared and discussed with immature stages of other species of Biblidinae.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bionomy; Life cycle; Neotropical; Papilionoidea.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262015000400301
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Age and growth of Cetengraulis edentulus (Clupeiformes: Engraulidae) in a subtropical bight of Southern Coast Brazil Rev. Bras. Zool.
Souza-Conceição,José Maria; Schwingel,Paulo Ricardo.
Age and growth of Cetengraulis edentulus (Cuvier, 1828) in the Saco dos Limões bight (Southern Brazil) were studied. Sampling was carried out from August 2001 to July 2003. The study of age and growth was based on the interpretation of the periodicity of ring formation in the otoliths sagittae of 491 individuals, temporal variation of otolith edge, relative marginal increments (RMI), age-length key, and von Bertalanffy curve. Cetengraulis edentulus otoliths were adequate for the interpretation of age with 86% of legibility, in which a translucent zone and its adjacent opaque zone were deposited each year. The translucent zone is formed during the cold period and the opaque zone in the warm period. Fish aged 0 (<12 months) - 4.0 year old were found and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anchovy; Life cycle; Maturity; Otolith.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000300003
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Immature stages and natural history of the Andean butterfly Altinote ozomene (Nymphalidae: Heliconiinae: Acraeini) Rev. Bras. Zool.
Velez,Patricia Duque; Montoya,Hugo Hernando Vargas; Wolff,Marta.
The immature stages (eggs, larvae and pupae), oviposition and larval behavior of Altinote ozomene (Godart, 1819) are described here for the first time. Larvae were reared from egg clutches collected from the host plants Erato vulcanica (Klatt) H.Rob and Munnozia senecionidis Benth (Asteraceae). Eggs were laid in groups on the undersides of leaves. The number of instars varied from five to eight within the same egg clutch, and the corresponding development time from larva to adult varied from 91 to 115 days. Most (72%) larvae pupated during the sixth instar. The first four instars fed only on the leaf cuticle, whereas later instars consumed the whole leaf. Larvae were gregarious during all instars but rested together only during the day in later instars,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Host plant; Immature behavior; Lepidoptera; Life cycle; Neotropical.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500007
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Aspectos biológicos e morfológicos de Leucanella viridescens (Lepidoptera: Saturniidae: Hemileucinae) Rev. Bras. Zool.
Specht,Alexandre; Corseuil,Elio; Benedetti,Augusto J.; Poletto,Graziela; Formentini,Aline C..
The goal of this work was to describe aspects of the biology and morphology of Leucanella viridescens (Walker, 1855), a polyphytophagous species that is a pest to several crops of economical interest and whose larvae may cause erucism. Biological parameters were obtained under controlled conditions: temperature of 25 ± 1ºC, relative humidity of 70 ± 10%, and a 14 h photophase. Morphological and behavioral aspects were analyzed in each developmental phase. The larval stage had six instars, with an average growth rate of 1.396. A high degree of polyphytophagy was observed, including over 49 host plant species belonging to 25 families, especially Leguminosae, Solanaceae and Salicaceae. The considerable chromatic variability of the adults obtained from the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caterpillars; Chromatic variation; Erucism; Life cycle; Morphology.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100005
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Immature stages of Spodoptera cosmioides (Lepidoptera: Noctuidae): developmental parameters and host plants Rev. Bras. Zool.
Specht,Alexandre; Roque-Specht,Vânia F..
ABSTRACT The goal of this study was to detail the temporal and morphological parameters of the immature stages of Spodoptera cosmioides (Walker, 1858) and to gather information about their larval host plants. Larvae were reared on artificial diet and under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photophase). The viability of eggs, larvae (pre-pupae period inclusive) and pupae were 98.97, 97.33, 97.95 and 94.76%, respectively. The average duration of egg, larval, pre-pupal and pupal stages was 3.82, 19.24, 3.20 and 14.81 days, respectively. A small proportion of females (9.48%) passed through seven instars, and female development was significantly slower than male development. The female larvae that developed through six and seven instars...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Armyworm; Artificial diet; Development; Life cycle; Soybean pod armyworm.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000400501
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Preliminary data on larval morphology and life cycle of Nitidula carnaria (Coleoptera: Nitidulidae), a species of forensic interest Rev. Soc. Entomol. Argent.
Zanetti,Noelia I.; Visciarelli,Elena C.; Centeno,Néstor D..
The species Nitidula carnaria (Schaller) (Coleoptera: Nitidulidae) has economic and forensics importance. The mature larva, reared under controlled conditions of laboratory, was described for the first time. Moreover, preliminary information about the life cycle is provided. The time recorded from the instance mates placed together to the emergence of imago was 59 ± 2.4 days. This publication represents the first record of N. carnaria in South America.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Carrion beetles; Forensic entomology; Life cycle.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802013000200007
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First colony of Stomoxys calcitrans (Diptera: Muscidae) successfully established under laboratory conditions in Argentina Rev. Soc. Entomol. Argent.
Angulo Lewylle,Maricel; Lecuona,Roberto E..
The stable flies, Stomoxys calcitrans (L.) (Diptera: Muscidae), are blood-sucking insects that represent a serious problem not only because of their hematophagy and transmission of pathogens, but also because of their considerable economic impact in animal production. No colony of these insects exists in Argentina. The objectives of this work were to establish the first Stomoxys calcitrans colony in this country, and to standardize and report the duration of each stage under controlled laboratory conditions. The adult flies were successfully reared in a growth chamber (28 ± 1 ºC and 47 ± 1 %RH, under a 14 h light: 10 h dark photoperiod); whereas the immature stages were kept at 25 ± 2 ºC and natural light. The cycle from eggs to adult emergence lasted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stable fly; Life cycle; Immature stages; Laboratory colony.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802014000200006
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Morphological, behavioral and biological aspects of Azya luteipes Mulsant fed on Coccus viridis (Green) Scientia Agricola
Nais,Juliana; Busoli,Antonio Carlos.
One of the major pests of nursery seedlings of coffee (Coffea arabica L.) is the green scale, Coccus viridis (Green) (Hemiptera: Coccidae). The main predators of this species are beetles of the family Coccinellidae, especially Azya luteipes Mulsant. Morphological, behavioral and biological aspects of A. luteipes feeding on C. viridis on coffee plants were examined under laboratory conditions. Tests were conducted in room temperature at 28 ± 2 ºC. A. luteipes oviposits on the underside of the scale's body, laying two to four eggs per insect. The eggs have a subelliptical form and a white-clear color, and the incubation period is 8.3 ± 1.2 days. The number of eggs laid per female per day varies between eight and ten. A. luteipes undergoes four larval instars...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coccinelids; Green scale; Development; Oviposition behavior; Life cycle.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100012
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1977 Corn and sorghum insects annual report Thai Agricultural
Boonsom Meksongsee; Panya Poonyathawon; Ocha Prachuabmoh; Auranuj Kongkanjana; Arunee Wongkobrat; Malee Chawanapong; Uthai Sangkasuwan; Watchara Wongkumhang; Thalearngsak Weerawooth.
11 tables
Palavras-chave: Corn; Maize; Sorghum; Sweet corn; Pest insects; Borers; Chilo sacchariphagus; Aphids; Armyworms; Mythimna separata; Ostrinia furnacalis; Life cycle; Infestation; Insecticides; Pesticides; Insect control; Yields; Losses; ข้าวโพด; ข้าวฟ่าง; หนอนเจาะลำต้น; เพลี้ยอ่อน; หนอนเจาะฝัก; แมลงที่เป็นประโยชน์; สารกำจัดแมลง.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3930
Registros recuperados: 83
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