altricial


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Related to altricial: precocial

altricial

[‚al′trish·əl]
(vertebrate zoology)
Pertaining to young that are born or hatched immature and helpless, thus requiring extended development and parental care.
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Studies that tagged altricial young were not considered here, because parents are generally the main cause of tag loss through removal.
Adaptive differences in response to two types of parental alarm call in altricial nestlings.
Dark nests and conspicuousness in color patterns of nestlings of altricial birds.
Sibling competition, hatching asynchrony, incubation period, and lifespan in altricial birds.
Nestling provisioning is an essential component of parental care in altricial birds and species vary in their patterns of provisioning.
One of our nests had an exceptionally large clutch of seven, a potential sign of intra-specific brood parasitism; however, egg dumping is a rare behavior used by <2% of avian species and even fewer altricial species (Payne 1977, MacWhirter 1989).
Altricial, open-nesting species in SC 2 were divided into two categories of smaller (28-59 g) and larger (60-91g) species.
In addition, parasitic eggs and young for precocial species may tax host-parent resources less than for altricial birds, providing less incentive for hosts to develop behaviors to counteract parasitism (Yom-Tov 1980, Sorenson 1992, Yom-Tov et al.
We also consider the factors that enable some hummingbirds to initiate breeding attempts in rapid succession despite the challenges of uniparental care of altricial young.
The number may also vary according to the development of young, where clutches of two or three eggs predominate in altricial species (Jetz et al.
This will enable us to disentangle the mechanistic relationships between exposure to urban stressors, oxidative stress, DNA methylation and telomere dynamics during development and the consequences for growth and survival in an altricial bird species.
An evolutionary backdrop to derived features of paternal care should also begin with a discussion of the evolution of highly altricial (helpless) and dependent offspring.