scholarly journals Descrição do comportamento agonístico de Loxosceles laeta, L. hirsuta e L. intermedia (Araneae: Sicariidae)

2008 ◽  
Vol 25 (4) ◽  
pp. 579-586 ◽  
Author(s):  
Marta L. Fischer
Keyword(s):  
Loxosceles Laeta

Os grupos de radiação evolutiva de Loxosceles Heinecken & Lowe, 1835 além de compartilharem caracteres morfológicos aparentemente também apresentam comportamentos semelhantes. Assim, o presente estudo objetivou descrever o comportamento agonístico dos machos das espécies do grupo spadicea - Loxosceles intermedia Mello-Leitão, 1934 e Loxosceles hirsuta Mello-Leitão, 1931 - e laeta -Loxosceles laeta (Nicolet 1849) - ocorrentes no estado do Paraná. Para tal, os machos foram pareados, sendo o invasor colocado nas teias do residente, descritos e quantificados os padrões motores exibidos. O comportamento agonístico de machos de L. laeta, L. intermedia e L. hirsuta foi caracterizado pelo afrontamento, defesa e combate, sendo apenas o último ritualizado e relacionado com peculiaridades de cada espécie, tendo em comum a sinalização de tamanho e força. Além dos padrões motores exibidos durante o comportamento agonístico serem semelhantes com aqueles utilizados no comportamento sexual, os padrões motores de L. intermedia e L. hirsuta foram mais semelhantes entre si e diferentes de L. laeta, sugerindo relação com o grupo de radiação evolutiva.

scholarly journals COMPARISON OF THE FERTILITY BETWEEN LOXOSCELES INTERMEDIA AND LOXOSCELES LAETA SPIDERS (ARANEAE, SICARIIDAE)

2000 ◽  
Vol 28 (2) ◽  
pp. 245-247 ◽  
Author(s):  
Rute Maria Gonçalves de Andrade ◽  
Wilson R. Lourenço ◽  
Denise Vilarinho Tambourgi
Keyword(s):  
Loxosceles Laeta

Effects of food, kinship, and density on the longevity of spiderlings

2021 ◽  
pp. 741-751
Author(s):  
Marta Luciane Fischer ◽  
Lays Cherobim Parolin ◽  
Felipe Marcel Neves ◽  
German Antonio Villanueva-Bonilla ◽  
João Vasconellos-Neto
Keyword(s):  
Population Density ◽  
Laboratory Experiments ◽  
Survival Rates ◽  
Food Resource ◽  
Behavioral Characteristic ◽  
Risk Of Predation ◽  
Large Populations ◽  
Main Factors ◽  
Conspecific Tolerance ◽  
Loxosceles Laeta

Cannibalism is a behavioral characteristic found in a wide variety of animal groups. Although the rates of cannibalism can vary from one group to another, studies indicate that the main factors contributing to an increase in the frequency of such behavior are the availability of food, population density, the behavior and availability of victims, and environmental stress. We carried out different laboratory experiments to assess whether different factors such as the presence or absence of food among siblings and non-siblings, and at different densities among conspecific and heterospecific individuals, affect longevity of recently emerged Brazilian brown recluse (Loxosceles intermedia Mello-Leitão, 1934) and Chilean recluse (Loxosceles laeta (Nicolet, 1849)) spiderlings during periods of starvation. The results revealed that the survivorship of L. laeta during starvation was significantly higher than that of L. intermedia and that the addition of conspecific individuals increased survival rates by 1.5- and 1.6-fold, respectively. The tolerance of conspecifics differed between the two species, and generally, cannibalism was not observed, probably due to the risk of predation and limited consumption by weakened spiders, which coincided with the continued availability of endogenous vitelline reserves, thus indicating that the use of these spiderlings as a food resource may act to regulate starvation in more resistant spiders. The greater longevity and conspecific tolerance of L. laeta may be important factors contributing to the establishment of large populations of this spider in restricted areas, whereas for L. intermedia, hunger probably functions as a trigger for dispersal.

scholarly journals Actualización sobre manejo de araneismo en Perú

2017 ◽  
Vol 28 (3) ◽  
pp. 200 ◽  
Author(s):  
Ciro Maguiña Vargas ◽  
Victor Figueroa Vásquez ◽  
Renata Pulcha Ugarte
Keyword(s):  
Latrodectus Mactans ◽  
Loxosceles Laeta

La mordedura de araña es un accidente muy común e importante problema de salud pública en lugares con clima tropical y se presenta como un problema muy frecuente en algunas regiones de Latinoamérica. En Perú las especies de araña que presentan más casos de esta problemática son Loxosceles laeta, Latrodectus mactans and Phoneutria spp. El presente trabajo pretende explicar, clarificar y categorizar estas mordeduras de arañas, con el fin de dar a conocerlas para ayudar a que los profesionales de la salud tengan un mayor conocimiento sobre las mismas para un mejor manejo de los casos que se les presenten.

Arachnidism by Loxosceles Laeta

1961 ◽  
Vol 83 (1) ◽  
pp. 139 ◽  
Author(s):  
HUGO SCHENONE
Keyword(s):  
Loxosceles Laeta

scholarly journals Effect of seasonal photoperiod on molting in Loxosceles reclusa and Loxosceles laeta spiders (Araneae: Sicariidae)

2017 ◽  
Vol 45 (3) ◽  
pp. 277-282 ◽  
Author(s):  
Richard S. Vetter ◽  
Linda M. Penas ◽  
Mark S. Hoddle
Keyword(s):  
Loxosceles Reclusa ◽  
Loxosceles Laeta
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