However, its hard to build a well-rounded collection of data on the species since each brood
only emerges once every 13 or 17 years, he said.
jemenitica, nest-volume, bee-space, brood
While some physiological characters correlate with the morphological characters (Guler, 1999), others such as brood
cycle, are genetically determined (Louveaux, 1973; Strange et al.
We determined the parentage of 276 nestlings from a total of 77 broods
produced both before and after the experiments started (43 broods
from the reciprocal experiment, 23 from the all-supplemented treatment, and 11 from the communal feeders treatment).
The latter criterion limits us to using data from 2009, 2010, and 2011 to estimate the proportion of females or pairs having second broods
Synchronized generations of three Magicicada species designated as Brood
II reliably emerge every 17 years in a swath of the U.
Grouse clutch and chick survival (proportion of hens with broods
and mean brood
size), in plot years with predator control, were significantly greater (1.
Cicada researchers are using observations from citizen scientists, along with automated devices equipped with GPS, to make more accurate records of Brood
II's emergence than any cicada invasion before.
The presence of Brood
XIX in Indiana brings the number of established periodical cicada broods
in the state to five (Kritsky 2004).
In previous years, the researchers found correlations between stress hormone levels, the number of offspring in a brood
, and the amount of weight nestlings gained.
In general, results indicate that parasites may strongly affect reproduction of female mosquitofish by reducing the number of embryos in developing broods
Females produced from one to four broods
each, averaging 2.
Three times this year the parents tirelessly raised broods
of brothers and sisters only to see them brutally murdered within days of leaving the nest.
Last year two broods
of barn owl youngsters died at John Wilson's Whitelee farm near Byrness, north of Otterburn.
The Northumberland farm lost two broods
of barn owl youngsters last year after suspected poisoning.