An Unusually Large Aggregation of Leptotyphlops

Copeia ◽  
1960 ◽  
Vol 1960 (4) ◽  
pp. 368 ◽  
Author(s):  
Clarence J. McCoy
Keyword(s):  
Large Aggregation

scholarly journals An Immunohistochemical and Ultrastructural Study of Segi's Cap, a Large Aggregation of Gut Endocrine Cells, in Bovine Fetuses

1983 ◽  
Vol 46 (5) ◽  
pp. 701-711 ◽  
Author(s):  
Hirofumi KURAMOTO ◽  
Junzo YAMADA ◽  
Nobuo KITAMURA ◽  
Tadayuki YAMASHITA ◽  
Noboru YANAIHARA
Keyword(s):  
Ultrastructural Study ◽  
Endocrine Cells ◽  
Large Aggregation ◽  
Bovine Fetuses ◽  
Gut Endocrine Cells

A Large Aggregation of 50 Peregrine Falcons (Falco peregrinus) During Migration in the Western Gulf of Mexico

2018 ◽  
Vol 52 (4) ◽  
pp. 500-502 ◽  
Author(s):  
Silvan T. Paganini ◽  
Amanda Stafford ◽  
Johann von Hirschheydt ◽  
Marc Kéry
Keyword(s):  
Gulf Of Mexico ◽  
Falco Peregrinus ◽  
Large Aggregation ◽  
Peregrine Falcons

Diapause in a large aggregation of a tropical beetle

1984 ◽  
Vol 9 (2) ◽  
pp. 217-230 ◽  
Author(s):  
HENK WOLDA ◽  
DAVID L. DENLINGER
Keyword(s):  
Large Aggregation

scholarly journals Identification and functional analysis of a developmentally regulated extracellular signal-regulated kinase gene in Dictyostelium discoideum.

1994 ◽  
Vol 14 (10) ◽  
pp. 6996-7012 ◽  
Author(s):  
C Gaskins ◽  
M Maeda ◽  
R A Firtel
Keyword(s):  
Dictyostelium Discoideum ◽  
Vegetative Growth ◽  
Genetic Interaction ◽  
Mitogen Activated Protein Kinase ◽  
Developmentally Regulated ◽  
Kinase Gene ◽  
Western Blots ◽  
Extracellular Signal Regulated Kinase ◽  
Large Aggregation ◽  
Extracellular Signal

We have cloned a developmentally regulated mitogen-activated protein kinase (extracellular signal-regulated kinase) from Dictyostelium discoideum designated ERK1. Using anti-pTyr antibodies, we show that ERK1 is phosphorylated on tyrosine in vivo and that it will phosphorylate myelin basic protein. The gene expresses two transcripts, one that is preferentially expressed during vegetative growth and early development and one that is induced during the multicellular stages. Developmental Western blots (immunoblots) using anti-ERK1 antibodies indicate that ERK1 is present throughout development. ERK1/lacZ reporter constructs suggest that, in the multicellular stages, the gene is preferentially expressed in a subpopulation of cells scattered throughout the organism, similar to the pattern seen with anterior-like cell markers. Antisense mutagenesis from a derepressible promoter indicates that ERK1 is essential for vegetative growth. Overexpression of ERK1 from either the Actin 15 promoter or the ERK1 promoter results in abnormal morphogenesis starting at the slug stage. Overexpression of ERK1 in null mutants of the phosphotyrosine phosphatase PTP2 results in the production of large aggregation streams and subsequent abnormal morphogenesis that indicate a genetic interaction between ERK1 and PTP2. These cells produce very large aggregation streams that break up into very small mounds that undergo abnormal morphogenesis. The genetic interaction between ERK1 and PTP2 appears to be specific since overexpression of ERK1 in a ptp1- null mutant does not produce the same phenotype. Our results indicate that ERK1 plays an essential role during the growth and differentiation of D. discoideum.

scholarly journals Termite colonies from mid-Cretaceous Myanmar demonstrate their early eusocial lifestyle in damp wood

2019 ◽  
Vol 7 (2) ◽  
pp. 381-390 ◽  
Author(s):  
Zhipeng Zhao ◽  
Xiangchu Yin ◽  
Chungkun Shih ◽  
Taiping Gao ◽  
Dong Ren
Keyword(s):  
Overlapping Generations ◽  
Division Of Labour ◽  
Brood Care ◽  
Burmese Amber ◽  
Multiple Generations ◽  
Large Aggregation ◽  
Rotting Wood ◽  
Reproductive Division Of Labour ◽  
Reproductive Division

Abstract Insect eusociality is characterized by cooperative brood care, reproductive division of labour and multiple generations of adults within a colony. The morphological specializations of the different termite castes from Burmese amber were recently reported, indicating the termites possessed advanced sociality in the mid-Cretaceous. Unfortunately, all the reported Cretaceous termites are individually preserved, which does not cover the behaviours of the cooperative brood care and multiple generations of adults in the nests of the Cretaceous termites. Herein, we report three eusocial aggregations from colonies of the oldest known Stolotermitidae, Cosmotermesgen. nov., in 100 Ma mid-Cretaceous Burmese amber. One large aggregation, comprising 8 soldiers, 56 workers/pseudergates and 25 immatures of different instars, additionally presents the behaviours of cooperative brood care and overlapping generations. Furthermore, taphonomic evidence indicates Cosmotermes most probably dwelled in damp/rotting wood, which provides a broader horizon of the early societies and ecology of the eusocial Cosmotermes.

scholarly journals Effects of Predation by Bumblebee Wolves (Philanthus bicinctus, sphecidae, hymenoptera) on Bumblebees and Plants

2003 ◽  
Vol 27 ◽  
pp. 78-78
Author(s):  
Reuven Dukas
Keyword(s):  
Conservation Biology ◽  
Yellowstone National Park ◽  
National Park ◽  
Large Aggregation

The interactions between flowers and their pollinators have been extensively studied in ecology, evolution and conservation biology. Although predators can dramatically influence insect-flower interactions, this issue has been mostly ignored until recently. One of the best systems for quantifying the effect of predators on pollinators is that of bumblebee wolves (Philanthus bicinctus), which are sphecid wasps endemic to the American Rockies, who prey almost exclusively on bumblebees. (see photos at http://psych.mcmaster.caldukas/pred&poll.htm). Relaying on research from 45 years ago, I located a large aggregation of bumblebee wolves at Yellowstone National Park and commenced research in summer 2003.

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