scholarly journals Within-Tree Distribution and Survival of the Eucalyptus Longhorned Borer Phoracantha semipunctata (Coleoptera: Cerambycidae) in a Mediterranean-Type Ecosystem

Insects ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 225
Author(s):  
Stephen Seaton ◽  
George Matusick ◽  
Giles Hardy
Keyword(s):  
Larval Development ◽  
Larval Survival ◽  
Severe Drought ◽  
Eucalyptus Marginata ◽  
Phoracantha Semipunctata ◽  
Tree Distribution ◽  
Eucalypt Forest ◽  
Attack Patterns ◽  
Mediterranean Type Ecosystem ◽  
Tree Characteristics

The attack patterns, infestation success and larval development of woodborers within living trees are complex and are largely shaped by host tree characteristics. Following a severe drought in a native eucalypt forest where outbreak densities of a native Australian beetle, the eucalyptus longhorned borer (Phoracantha semipunctata), occurred, a tree dissection study was conducted in Australia. This involved felling 40 trees each of jarrah (Eucalyptus marginata) and marri (Corymbia calophylla) that were cut into 1-m sections and neonate larval galleries, larvae in pupal cells and adult borer emergence were measured and added to give total numbers per tree to determine the within-tree distribution and survival of P. semipunctata. There was a significant impact on larval survival in both species, in contrast, pupal survival remained high. Within-tree distribution of P. semipunctata was directional with borer emergence and incidence of larval galleries both negatively associated with tree section height above the ground and positively associated with section diameter and bark thickness, reaching a maximum towards the base of trees. High incidence and survival in lower thicker tree sections indicate a more conducive environment for larval development, in contrast to poor larval survival in smaller thinner sections at the top of trees. The dependence of larval survival on tree characteristics controlling the within-tree distribution of borer emergence is emphasized, and needs to be considered when estimating the spread of borer populations during outbreaks.

scholarly journals Effects of Temperature on the Survival and Larval Development of Deiratonotus Japonicus (Brachyura, Camptandriidae) as a Biological Indicator

2020 ◽  
Vol 8 (3) ◽  
pp. 213 ◽  
Author(s):  
Il-Kweun Oh ◽  
Seung-Woo Lee
Keyword(s):  
Larval Development ◽  
Brachionus Plicatilis ◽  
Survival Rates ◽  
Biological Indicator ◽  
Larval Survival ◽  
Effect Of Temperature ◽  
Larval Stages ◽  
Kanagawa Prefecture ◽  
Survival And Growth ◽  
Increasing Temperature

Deiratonotus japonicus (D. japonicus) inhabits isolated locations and upstream brackish waters from Kanagawa Prefecture to Okinawa Prefecture in Japan. This species faces the threat of extinction because of changing habitat conditions. Our previous studies have shown that its complete larval development from hatching to metamorphosis consists of five zoeal stages and one megalopal stage. In this study, the effect of temperature on the survival and growth of larval development in D. japonicus under controlled laboratory conditions of 13, 18, 23, 24, 25, and 26 °C was investigated by rearing larvae (30 PSU; 12:12 h light/dark cycle; fed a diet of Brachionus plicatilis rotundiformis and Artemia sp. nauplii). The survival rates and developmental periods were measured for each larval stage. The highest survival rates were obtained at 18–24 °C. Metamorphosis to megalopa occurred at 23–25 °C. There were rapid and synchronous developments at 25–26 °C but delayed and extended developments at 13 °C. The molting period decreased with increasing temperature. With decreasing temperature, the beginning of the development and duration of molting was prolonged. In addition, there were very low survival rates at 13 °C and 26 °C in all zoeal stages. Our results indicate that the early larval stages of D. japonicus are well adapted to 18–24 °C, the range observed in the estuarine marine environment of the Kita River during the breeding season. Optimum larval survival and growth were obtained at 23 °C. Temperature significantly affected the survival rate, developmental period, and molting of the larvae. The relationship between the cumulative periods of development from hatching through individual larval stages (y) and temperatures (T) was described as a power function (y = a × Tb).

scholarly journals Linking rising pCO2 and temperature to the larval development and physiology of the American lobster (Homarus americanus)

2016 ◽  
Vol 74 (4) ◽  
pp. 1210-1219 ◽  
Author(s):  
Jesica D. Waller ◽  
Richard A. Wahle ◽  
Halley McVeigh ◽  
David M. Fields
Keyword(s):  
Climate Change ◽  
Larval Development ◽  
Stage Iv ◽  
Homarus Americanus ◽  
Larval Survival ◽  
Interactive Effects ◽  
High Pco2 ◽  
American Lobster ◽  
Feeding Rates ◽  
Intergovernmental Panel

Few studies have evaluated the joint effects of elevated temperature and pCO2 on marine organisms. In this study we investigated the interactive effects of Intergovernmental Panel on Climate Change predicted temperature and pCO2 for the end of the 21st century on key aspects of larval development of the American lobster, Homarus americanus, an otherwise well-studied, iconic, and commercially prominent species in the northeastern United States and Atlantic Canada. Our experiments showed that larvae (stages I–III) and postlarvae (stage IV) reared in the high temperature treatments (19 °C) experienced significantly lower survival, developed twice as fast, and had significantly higher oxygen consumption rates, than those in ambient treatments (16 °C). Larvae from the ambient temperature/high pCO2 (750 ppm) treatment had significantly longer carapace lengths, greater dry masses in stages I–III and higher C: N ratios in stage IV than larvae from all other treatments. Stage IVs raised in the high pCO2 treatment at 19 °C had significantly higher feeding rates and swimming speeds than stage IVs from the other three treatments. Together these results suggest that projected end-century warming will have greater adverse effects than increased pCO2 on larval survival, and changing pCO2 may have a complex effect on larval metabolism and behaviour. Understanding how the most vulnerable life stages of the lobster life cycle respond to climate change is essential in connecting the northward geographic shifts projected by habitat quality models, and the underlying physiological and genetic mechanisms that drive their ecology.

scholarly journals Influences of Temperature on Development and Survival, Reproduction and Growth of a Calanoid Copepod (Pseudodiaptomus dubia)

2009 ◽  
Vol 9 ◽  
pp. 866-879 ◽  
Author(s):  
Changling Li ◽  
Xiaoxia Luo ◽  
Xianghu Huang ◽  
Binhe Gu
Keyword(s):  
Growth Rate ◽  
Water Temperature ◽  
Larval Development ◽  
Calanoid Copepod ◽  
Southern China ◽  
Larval Survival ◽  
Population Doubling ◽  
Population Doubling Time ◽  
Reproduction Rate ◽  
Egg Hatching

Pseudodiaptomus dubiais a calanoid copepod that is distributed widely in the estuarine-coastal waters of Asia and is a dominant copepod in the shrimp grow-out ponds in southern China. A laboratory culture experiment was conducted to evaluate the influences of water temperature on larval development, survival, and reproduction. Results indicate that within a temperature range from 15 to 35°C, larval development increases as the temperature increases. The water temperature for optimal larval survival rate ranges from 20 to 35°C. Longevity and egg hatching time decrease as the temperature increases from 20 to 35°C. Total fecundity and reproduction frequency increase as the water temperature increases, with the maximum at 30°C. Fecundity and reproduction frequency decrease when the temperature exceeds 30°C. Intrinsic growth rate (rm) ranges from 0.168 to 0.195 at 25 to 30°C; net reproduction rate (R0) and finite growth rate (?) are 163 to 264 and 1.183 to 1.215, respectively, when the temperature is greater than 20 and 35°C; population doubling time (t) varies from 3.556 to 4.128 days at temperatures less than 20 and 35°C. Population generation time (T) is negatively correlated with temperature, with the optimal population growth rate at 25 to 30°C.

scholarly journals THE GENETICS OF MELANISM IN MALACOSOMA DISSTRIA HÜBNER (LEPIDOPTERA: LASIOCAMPIDAE)

Genetics ◽  
1979 ◽  
Vol 92 (2) ◽  
pp. 555-561
Author(s):  
Nancy Lorimer
Keyword(s):  
Larval Development ◽  
Morphological Traits ◽  
Autosomal Dominant ◽  
Low Frequency ◽  
Larval Survival ◽  
Malacosoma Disstria ◽  
Forest Tent Caterpillar ◽  
Development Times ◽  
Genetically Determined ◽  
Tent Caterpillar

ABSTRACT The forest tent caterpillar is polymorphic far two melanic genes affecting wing color of moths. These are the first genetically determined morphological traits reported for the genus. Dark (D) is a sex-limited, autosomal dominant with a phenotype of dark brown males. Frequencies in population samples varied from 8 to 44%. Characteristics of Dark and nonmelanic males were compared. Larval development times, larval survival and pupal weights were not significantly different, but mean fecundity was higher for females with Dark progeny. Band (b), a darkened area across the forewings, occurred in low frequency in both sexes.

Effect of Leaf Age and Photoperiod on Buck Moth (Lepidoptera: Saturniidae) Larval and Pupal Development

1991 ◽  
Vol 26 (3) ◽  
pp. 312-319 ◽  
Author(s):  
L. D. Foil ◽  
T. N. Hardy ◽  
S. J. Johnson ◽  
G. E. Church ◽  
A. M. Hammond
Keyword(s):  
Larval Development ◽  
Leaf Age ◽  
Larval Survival ◽  
Late Spring ◽  
Pupal Development ◽  
Early Season ◽  
Live Oak ◽  
Buck Moth ◽  
Hemileuca Maia

Dietary “early season” live oak foliage and longer scotophase accelerated larval development and resulted in heavier pupae of the buck moth, Hemileuca maia (Drury). Female pupae were heavier than male pupae under all conditions. Males required significantly fewer days to pupate. Rearing at a shortened scotophase on more mature foliage reduced larval survival. Phenolics and tannins were higher in early season oak foliage than in late spring foliage.

Relationship Between Weed Communities in Corn and Infestation and Damage by the Stalk Borer (Lepidoptera: Noctuidae)

1991 ◽  
Vol 26 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Daniel M. Pavuk ◽  
Benjamin R. Stinner
Keyword(s):  
Larval Survival ◽  
Severe Drought ◽  
Corn Plant ◽  
Stalk Borer ◽  
Weed Communities ◽  
Corn Fields ◽  
Corn Plants ◽  
The Relationship ◽  
Lepidoptera Noctuidae

During 1988 and 1989, the relationship between different weed communities in corn plantings and infestation of and damage to corn by the stalk borer, Papaipema nebris (Guenée) (Lepidoptera: Noctuidae), was studied in Ohio. The four treatments were corn without weeds, corn principally with broadleaf weeds, corn principally with grasses, and corn with a mixture of both weed types. In 1988, there were no significant differences between treatments with broadleaf weeds and treatments without broadleaf weeds, and between treatments with grassy weeds and treatments without grassy weeds, in terms of number of larvae per corn plant and number of corn plants damaged. Low populations of P. nebris in corn during 1988 may have been associated with severe drought which caused low larval survival. There were significantly more larvae per corn plant and a significantly greater percentage of corn plants damaged in plantings containing broadleaf weeds than in corn plantings without broadleaf weeds in 1989. The results of this study show that the presence of broadleaf weeds in corn fields may lead to increased infestation of corn by stalk borer larvae.

Embryonic and larval development and segment formation in Ibla quadrivalivis Cuv. (Cirripedia).

1965 ◽  
Vol 13 (1) ◽  
pp. 1 ◽  
Author(s):  
DT Anderson
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Larval Growth ◽  
Growth Zone ◽  
Larval Survival ◽  
Direct Development ◽  
Gut Development ◽  
Free Swimming ◽  
Phylogenetic Affinity ◽  
Embryonic And Larval Development

Embryonic development in I. quadrivalvis follows the typical cirripede pattern except for modifications of cleavage and of development of the gut, associated with a large yolky egg. The nauplius is free-swimming but lecithotrophic. It does not grow, and moults irregularly. The development of cypris features begins precociously and the second half of naupliar life is demersal. The cypris stage is unmodified. Settling was not observed. The maxillary segments develop as a delayed continuation of the naupliar segmental sequence, the thoracic segments from a growth zone of seven ectoteloblasts and eight mesoteloblasts. Each row of eight cells budded from the mesoteloblasts develops into the paired somites of a segment. The midgut develops independently of the yolk cells. In cirripedes, increased yolk results in modification of cleavage and gut development but otherwise has little influence on embryonic development. Larval modifications associated with lecithotrophy promote direct development of the cypris but do not include modification of the cypris. Irregularity of moulting is associated with lack of larval growth. Relative brood sizes suggest that increased yolk in cirripedes offers advantages in larval survival. Post-naupliar segment formation in cirripedes resembles in detail that of Malacostraca, indicating a possible phylogenetic affinity between Malacostraca and Maxillopoda which can be tested by further studies on segment formation in non- Malacostraca.

Life histories of six species of Leptoceridae (Insecta: Trichoptera) in Victoria

1993 ◽  
Vol 44 (2) ◽  
pp. 363 ◽  
Author(s):  
RM St.Clair
Keyword(s):  
Life History ◽  
Larval Development ◽  
Life Histories ◽  
Adult Emergence ◽  
Severe Drought ◽  
Emergence Period ◽  
University Life ◽  
History Of ◽  
Study Sites ◽  
Temporary River

Life history studies were carried out for populations of six species of Leptoceridae. Study sites were a permanent river (Acheron), a temporary river (Lerderderg) and a permanent lake (Monash University). Life histories varied in degree of synchrony of larval development, in length of adult emergence period, and from bi- to semivoltine. Oviposition requirements of adults were found to be the major factor influencing synchrony of the life history of one species. Life history features did not ameliorate the effects of the severe drought of 1982-83, nor did drought result in large changes in life histories.

scholarly journals Lack of Negative Effects of Fasting of Gilthead Seabream (Sparus Aurata) Breeders During the Spawning Period on Maternal and Egg Nutrient Composition, Fertilization Success and Early Embryo/larval Development

2021 ◽  
Author(s):  
Stavros Chatzifotis ◽  
Abraham Gómez Gutiérrez ◽  
Maria Papadaki ◽  
Fabrizio Caruso ◽  
Irini Sigelaki ◽  
...  
Keyword(s):  
Larval Development ◽  
Proximate Composition ◽  
Sparus Aurata ◽  
Larval Survival ◽  
Fertilization Success ◽  
Early Embryo ◽  
Nutrient Composition ◽  
Gilthead Seabream ◽  
Main Study ◽  
Spawning Period

Abstract The effect of fasting on spawning performance, maternal and egg nutrient composition, and on embryo/larval development was monitored in gilthead seabream (Sparus aurata). Two broodstocks were fasted during two consequtive years, for a period of 43 and 54 days withing the spawning season, in a preliminary (year 1) and a main study (year 2), respectively. Mean daily fecundity showed a declining trend during fasting in the main study only, while fertilization success was high in both years and it was not affected by fasting, as was hatching and 5-day larval survival. There was a loss of 23.5% of maternal body mass due to fasting, and gonadosomatic and hepatosomatic indexes as well as crude protein in maternal muscle and gonads -but not in liver- were reduced after fasting. In muscle, after fasting Σω-6 PUFA and C18:3ω-3 were reduced while C20:4ω-6, 20:5ω-3/20:4ω-6 and C22:6ω-3/20:4ω-6 increased; in liver, significant reductions were observed in C16:0, C18:3 ω-3, 20:5ω-3/C22:6ω-3 and increases in C18:0, C20:5ω-3, Σω-6 PUFA and 20:5ω-3/20:4ω-6; in gonads, C15:0, ΣMUFA, 20:5ω-3/C22:6ω-3, 20:5ω-3/20:4ω-6 were increased while C18:1ω-9, C20:5ω-3 reduced. Contrary to maternal tissues, the energy density and proximate composition of the eggs did not change due to fasting. The study suggests that fasting of gilthead seabream breeders for many weeks during the spawning period does not affect spawning performance, egg proximate composition or embryo and early larval development, since maternal nutrient reserves are mobilized to maintain optimal egg nutrient composition.

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