scholarly journals First record of rare dasydytid gastrotrich Setopus tongiorgii (Balsamo, 1982) from central Europe with some biological data

Zootaxa ◽  
2008 ◽  
Vol 1680 (1) ◽  
pp. 59
Author(s):  
ALEXANDER KIENEKE ◽  
OLE RIEMANN
Keyword(s):  
Life Cycle ◽  
Water Column ◽  
Central Europe ◽  
First Record ◽  
Biological Data ◽  
High Population ◽  
Population Densities ◽  
Head Region

Members of the freshwater family Dasydytidae belong to the rarest gastrotrichs although some species like Stylochaeta scirtetica may develop high population densities (Schwank 1990). The taxon Dasydytidae is characterised by several apomorphic features correlated to a semi-planktonic lifestyle. Species of Dasydytidae have, for example, completely lost their caudal adhesive tubes, they possess a system of ciliary bands in the head region with which they swim like ciliated larvae of annelids, and most species have motile spines to perform saltatory movements in the water column. So far, our knowledge on the biology, life cycle and their distribution is very limited. This is probably due to the rareness and difficult preparation and handling of Dasydytidae.

Life Cycle of Carpophilus humeralis F. (Coleoptera: Nitidulidae) in Puerto Rico

1969 ◽  
Vol 68 (1) ◽  
pp. 53-57
Author(s):  
Fernando Gallardo-Covas
Keyword(s):  
Puerto Rico ◽  
Life Cycle ◽  
Reproductive Potential ◽  
Larval Period ◽  
High Population ◽  
Population Densities ◽  
Ripe Fruit ◽  
Laboratory Conditions ◽  
Carpophilus Humeralis

Carpophilus humeralis F. is one of the main pests on pineapple in Puerto Rico. This insect has high population densities because of a high reproductive potential, each female under laboratory conditions, lays about 542 eggs over a two month period, averaging 9 eggs per day; short larval period (18 days); longevity of adults (2.5 months); and abundance of ripe fruit in pineapple fields as sites for constant reproduction.

scholarly journals First record of Dero (Aulophorus) bimagnasetus Harman (Oligochaeta) from Brazil and habitat characteristics

2014 ◽  
Vol 74 (2) ◽  
pp. 483-488
Author(s):  
R. Campitelli-Ramos ◽  
JV. Lucca ◽  
LLD. Oliveira ◽  
MR. Marchese ◽  
O. Rocha
Keyword(s):  
Benthic Communities ◽  
First Record ◽  
Biological Data ◽  
Habitat Characteristics ◽  
Low Oxygen ◽  
Body Width ◽  
Ecological Information ◽  
Freshwater Biota ◽  
Physical And Chemical ◽  
First Time

Annelid worms represent a significant part of freshwater benthic communities worldwide and Oligochaeta is a particularly species-rich group. Dero (A) bimagnasetus (Naididae) previously found and described from a small marsh in Surinam in 1974, has now been found for the first time in Barra Lake, MG, Brazil. Due to the scarce biological data and absence of ecological information in the literature regarding this species we are presenting morphological information on the specimens obtained and the physical and chemical characteristics of the habitat they were found. This species occurred only in the littoral zone of Barra Lake, in muddy, low oxygen, low conductivity and low organic matter sediment. The four individuals collected ranged 3.17-4.15 mm total length; 0.25 - 0.26 mm body width and 0.16-0.21 mm3 total volume. Considering the present anthropic pressures on freshwater biota and fast biodiversity losses worldwide it is now recognized that attention must be paid to low abundance species and the urgency for preservation of their habitats.

Maternal Inhibition of Hatching at High Population Densities inTigriopus japonicus(Copepoda, Crustacea)

1988 ◽  
Vol 174 (2) ◽  
pp. 139-144 ◽  
Author(s):  
DAVID KAHAN ◽  
YEHUDA BERMAN ◽  
THEODORA BAR-EL
Keyword(s):  
High Population ◽  
Population Densities

scholarly journals Biology and Nutritional Indexes of Spodoptera frugiperda (Lepidoptera: Noctuidae) in Saccharine Sorghum

2019 ◽  
Vol 11 (4) ◽  
pp. 126
Author(s):  
Lauren M. Barcelos ◽  
Fabrício O. Fernandes ◽  
Caroline Lopes ◽  
Beatriz M. Emygdio ◽  
Ricardo Valgas ◽  
...  
Keyword(s):  
Life Cycle ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Biological Data ◽  
Egg Laying ◽  
Grain Production ◽  
Current Analysis ◽  
Suitable Host ◽  
Significant Difference ◽  
Lepidoptera Noctuidae

Saccharine sorghum has been analyzed as a supplementary prime matter for ethanol production, especially during the sugarcane off-season period. However, it has proven to be highly susceptible to insect attacks during the cultivation cycle. The fall armyworm should be emphasized due to its voracity and high damage capacity enhanced by feeding-caused decrease in photosynthetic area. Current analysis studies the biology and determines the nutritional indexes of Spodoptera frugiperda in saccharine sorghum. Cultivars of saccharine sorghum BRS 506, BRS 509 and BRS 511were evaluated. Duration and survival of the egg, caterpillar, pre-pupal and pupal phases were determined, coupled to weight of pupae and caterpillar, life span, fecundity and pre-egg laying period. Although S. frugiperda completed its life cycle on cultivars BRS 506 and BRS 511, egg-laying and egg feasibility rates were low, whereas insects did not lay eggs on cultivar BRS 509. There was no significant difference in feeding intake by S. frugiperda among these three sorghum cultivars. Results suggest that saccharine sorghum is not a suitable host for S. frugiperda. Biological data reveal that the three saccharine sorghum cultivars are recommended for the grain production system since the number of specimens of the next generation is low or null.

scholarly journals The significance of biomass allocation to population growth of the invasive species Ambrosia artemisiifolia and Ambrosia trifida with different densities

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Wenxuan Zhao ◽  
Tong Liu ◽  
Yan Liu ◽  
Hanyue Wang ◽  
Ruili Wang ◽  
...  
Keyword(s):  
Cluster Formation ◽  
Ambrosia Artemisiifolia ◽  
High Density ◽  
High Population ◽  
Leaf Biomass ◽  
Total Biomass ◽  
Low Density ◽  
Population Densities ◽  
Ambrosia Trifida ◽  
Short Period

Abstract Background Ambrosia artemisiifolia and Ambrosia trifida are globally distributed harmful and invasive weeds. High density clusters play an important role in their invasion. For these two species, the early settled populations are distributed at low densities, but they can rapidly achieve high population densities in a short period of time. However, their response to intraspecific competition to improve the fitness for rapid growth and maintenance of high population densities remains unclear. Therefore, to determine how these species form and maintain high population densities, individual biomass allocations patterns between different population densities (low and high), and plasticity during seedling, vegetative, breeding and mature stages were compared. In 2019, we harvested seeds at different population densities and compared them, and in 2020, we compared the number of regenerated plants across the two population densities. Results Most biomass was invested in the stems of both species. Ambrosia trifida had the highest stem biomass distribution, of up to 78%, and the phenotypic plasticity of the stem was the highest. Path analysis demonstrated that at low-density, total biomass was the biggest contributor to seed production, but stem and leaf biomass was the biggest contributors to high-density populations. The number of seeds produced per plant was high in low-density populations, while the seed number per unit area was huge in high-density populations. In the second year, the number of low-density populations increased significantly. A. artemisiifolia and A. trifida accounted for 75.6% and 68.4% of the mature populations, respectively. Conclusions High input to the stem is an important means to regulate the growth of the two species to cope with different densities. These two species can ensure reproductive success and produce appropriate seed numbers. Therefore, they can maintain a stable population over time and quickly form cluster advantages. In the management, early detection of both species and prevention of successful reproduction by chemical and mechanical means are necessary to stop cluster formation and spread.

First record of the genus Disholcaspis Dalla Torre & Kieffer (Hymenoptera: Cynipidae: Cynipini) in the Neotropics, with description of two new species from Panama

Zootaxa ◽  
2011 ◽  
Vol 2802 (1) ◽  
pp. 27 ◽  
Author(s):  
ENRIQUE MEDIANERO ◽  
JOSÉ LUIS NIEVES-ALDREY
Keyword(s):  
New Species ◽  
First Record ◽  
Neotropical Region ◽  
Biological Data ◽  
Diagnostic Characters ◽  
Two New Species ◽  
Community Data

Two new species of Disholcaspis Dalla Torre & Kieffer 1910, Disholcaspis bettyannae and D. bisethiae (Hymenoptera: Cynipidae: Cynipini) are described from Panama. The two new species induce galls on Quercus bumelioides Liebm. and Q. lancifolia Schledl & Cham. (Fagaceae, sect. Quercus, White Oaks). Diagnostic characters, gall descriptions, distribution, biological data, as well as inquiline and parasitoid associated community data of the new species are given. The new species represent the first records of the genus Disholcaspis from the Neotropical region.

scholarly journals First record of Dendroctonus micans (Kugelann, 1794) on non-native spruces in Slovakia – short communication

2016 ◽  
Vol 52 (No. 4) ◽  
pp. 277-282
Author(s):  
Vakula Jozef ◽  
Zúbrik Milan ◽  
Galko Juraj ◽  
Gubka Andrej ◽  
Kunca Andrej ◽  
...  
Keyword(s):  
Central Europe ◽  
Bark Beetle ◽  
Urban Areas ◽  
Short Communication ◽  
First Record ◽  
Dendroctonus Micans ◽  
Coniferous Trees ◽  
Picea Pungens ◽  
Spruce Bark ◽  
Rhizophagus Grandis

In 2015, we recorded the first attack of the great spruce bark beetle, Dendroctonus micans (Kugelann) (Coleoptera: Curculionidae, Scolytinae) on non-native Picea orientalis (L.) and Picea pungens (Engelmann) in Slovakia. To our knowledge, the occurrence of D. micans on P. orientalis in Central Europe has not been described yet. We found that D. micans preferred P. orientalis over P. pungens and other coniferous trees in urban areas. In laboratory conditions, 352 adults of D. micans emerged and only 1 predator, Rhizophagus grandis (Gyllenhal) (Coleoptera: Monotomidae), was recorded. D. micans has a potential to become a serious pest of P. orientalis and P. pungens in urban, and in air-polluted areas.

High population densities of Macrolophus pygmaeus on tomato plants can cause economic fruit damage: interaction with Pepino mosaic virus ?

2015 ◽  
Vol 72 (7) ◽  
pp. 1350-1358 ◽  
Author(s):  
Rob Moerkens ◽  
Els Berckmoes ◽  
Veerle Van Damme ◽  
Nelia Ortega-Parra ◽  
Inge Hanssen ◽  
...  
Keyword(s):  
Mosaic Virus ◽  
High Population ◽  
Population Densities ◽  
Pepino Mosaic Virus ◽  
Tomato Plants ◽  
Macrolophus Pygmaeus ◽  
Fruit Damage

First record of the root knot nematode, Meloidogyne minor in New Zealand with description, sequencing information and key to known species of Meloidogyne in New Zealand 

Zootaxa ◽  
2017 ◽  
Vol 4231 (2) ◽  
pp. 203 ◽  
Author(s):  
ZENG QI ZHAO ◽  
WELLCOME HO ◽  
RUTH GRIFFIN ◽  
MICHAEL SURREY ◽  
ROBERT TAYLOR ◽  
...  
Keyword(s):  
New Zealand ◽  
Large Subunit ◽  
Intergenic Spacer ◽  
First Record ◽  
Small Subunit ◽  
Root Knot Nematode ◽  
Head Region ◽  
Internal Transcribed Spacer Region ◽  
Stage Juvenile ◽  
Labial Disc

Meloidogyne minor Karssen et al. 2004 was collected from perennial ryegrass (Lolium perenne L.) growing in a sports ground in Christchurch, New Zealand. This is a new record for M. minor, the first report of this nematode occurring in New Zealand, and the second report from the southern hemisphere (after Chile). In general, the New Zealand isolate of M. minor corresponds well to the descriptions of M. minor given by Karssen et al. (2004). The New Zealand isolate is characterized by having a female with dorsally curved stylet, 13–14 μm long, with transversely ovoid knobs slightly sloping backwards from shaft; rounded perineal pattern; and male with stylet 16–19 μm long, large transversely ovoid knobs sloping slightly backwards from shaft; head region not set off, labial disc elevated, lateral lips prominent; and second stage juvenile 370–390 μm long, with hemizonid posterior but adjacent to excretory pore; tail 53–63 μm long; and a distinct hyaline tail terminus 14–18 μm long. In addition, molecular phylogeny using near full length small subunit (SSU), D2/D3 expansion segments of the large subunit (LSU), the internal transcribed spacer region (ITS1 and 2), and the intergenic spacer (IGS2) of the ribosomal rDNA supports the identification. 

Sign in / Sign up

Export Citation Format

Share Document