The Biotic Associations of CockroachesRoth, Louis M. (Louis Marcus)
Science
The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus)
Cockroaches; Insects -- Ecology
The African mountain cockroach _Aptera fusca_ has been observed during
late summer and early winter in familial groups beneath loose bark,
under stones, and in dead leaves (Skaife, 1954): "Each party consists of
a number of black young ones, together with one, two or more adult
females and perhaps a winged male or two. Later on they scatter and live
more or less solitary lives." In Malaya Karny (1924) often found
phoraspidine females between leaves surrounded by about 20 young nymphs.
He stated that one also often found females of _Perisphaerus armadillo_
surrounded by pale, yellowish-white young; similarly he had observed
that _Archiblatta hoevenii_ was found mostly in colonies made up of
mothers and their young. The duration of these associations is not
known.
Saupe (1928) noticed that the newly hatched nymphs of _Blaberus
craniifer_ (see footnote II, p. 322) collected together under the body
of their mother and stated that this is as pronounced a case of brood
care as Zacher had observed with _Pycnoscelus surinamensis_. Nutting
(1953) stated that "A degree of maternal solicitude is exhibited by this
roach [_B. craniifer_], for many times I have observed the female to
remain motionless for an hour or more with her unpigmented brood
clustered around and beneath her body." We, too, have observed similar
behavior in laboratory colonies of _B. craniifer_ and _Leucophaea
maderae_.
Chopard (1950) noted that after hatching the young of _Gromphadorhina
laevigata_ remained grouped around the female for some time; the mother
stood motionless, high on her legs, with her thorax curved up to make
room for the brood which hid under her body. We (unpublished data, 1958)
have seen young nymphs of _Gromphadorhina portentosa_ also stay near
their mother for some time after birth; the mother at this time produced
a characteristic hissing sound when she was only slightly disturbed by
the movement of our hand near her and her brood. The sound is produced
as air is expelled through the second abdominal spiracle. We have seen
recently hatched nymphs of _Nauphoeta cinerea_ crawl beneath the mother,
even under her wings, where they remained about an hour (Willis et al.,
1958). Bunting (1956) observed a female of _Blaberus discoidalis_
collect a mound of debris into which she inserted the tip of her
abdomen; he found young in the mound later the same day. This female
showed no maternal care for the young after birth. Whole families of
cockroaches may be found in bromeliads in Brazil (Ohaus, 1900). Hebard
(1920) observed a colony of adults and young of _Dendroblatta sobrina_
on a tree trunk in the Panama Canal Zone.
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