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Natural History and Larval Behavior of the parasitoid Zatypota petronae (Hymenoptera: Ichneumonidae)
(2007)
The koinobiont ectoparasitoid Zatypota petronae Gauld (Ichneumonidae) parasitizes medium-sized immatures of the cobweb spider Theridion evexum Keyserling (Theridiidae). Zatypota petronae apparently attacks the spider inside ...
Conceptual and statistical problems with the use of the Shannon-Weiner entropy index in bioacoustic analyses
(2018-04-03)
Information theory and its indices were developed for human communication to predict the amount of information transferred in a message. One such index, the Shannon-Weiner index (SWI), has often been used to analyse ...
Courtship behavior and copulation in Tengella radiata (Araneae, Tengellidae)
(2008)
The first description of the courtship behavior and copulation is provided for Tengella radiata (Kulczynski 1909). The male courts the female by rocking his body and vibrating his abdomen. These behaviors seem to induce ...
Detritus camouflage in webs of Helvibis longicauda (Araneae: Theridiidae)
(2007)
Adult females of Helvibis longicauda accumulated tiny pieces of vegetation in the mesh of their webs. The amount of debris accumulated was much greater in webs of spiders with either egg sacs, spiderlings or juveniles than ...
When a little is enough: cocoon web of Kapogea cyrtophoroides (Araneae: Araneidae) induced by Hymenoepimecis heidyae (Ichneumonidae: Pimplinae)
(2018)
The final instar larvae of the koinobiont ectoparasitoids in the Polysphincta group of genera induce their host spiders to construct webs that protect the wasp pupa during its development. It has been hypothesized that ...
Alimentacion de pichones, exito reproductivo y notas sobre cuido parental en yiguirros (Turdus grayi): el rol de las hembras y machos
Nestling feeding, nest success, and notes of parental care in the Clay-colored Thrush (Turdus grayi): the role of females and males
(2018)
Las hembras frecuentemente invierten ma ́s que los machos en cuido parental, pero en sistemas sociales monogamos, los machos invierten tanto como las hembras en el cuido de su progenie y se estima que esta contribucion ...
Characteristics of the capture threads of Synotaxus sp. (probably S. turbinatus) webs (Araneae, Synotaxidae)
(2009)
Synotaxus spiders have independently evolved aerial, planar webs to intercept and retain prey, but these webs differ in several respects from planar araneoid webs with similar functions. The silk capture threads of Synotaxus ...
House Wrens Troglodytes aedon reduce repertoire size and change song element frequencies in response to anthropogenic noise
(2020-06-09)
Anthropogenic noise (≤ 3 kHz) can affect key features of birds’ acoustic communication via two different processes: (1) song-learning, because songbirds need to hear themselves and other birds to crystallize their song, ...
Messua sp. (Salticidae), the host spider of the polysphinctine Inbioia pivai (Ichneumonidae: Pimplinae)
(2019)
The koinobiont ectoparasitoids of spiders in the Polysphincta genus group are divided into two well-supported clades. Species in one clade parasitize spiders in the higher araneoid group, and the behaviour of these ...
Carrion Feeding By Spiderlings Of The Cob-Web Spider Theridion evexum(Araneae, Theridiidae)
(2007)
The use of carrion to feed spiderlings has never previously been observed in spiders. Here we show that the theridiid Theridion evexum Keyserling 1884 stored dead insectan prey for up to one week prior to the emergence of ...