- What is a partial migration?
- What is an intra-African migrant bird?
- How much do we know about migratory bird migration patterns?
- What is partial migration in biology?
- Is irruptive migration fundamentally different from conventional migration of birds?
- What is the most common type of migration?
- What do we know about intra-African migratory patterns?
- Do genetics explain migration patterns?
- What happens to lost young birds when they migrate?
- Is it possible to reverse a bird’s migration?
- Why are breeding and wintering sites important to migratory birds?
- Is migratory behavior inherited?
- What do we know about migration genetics?
- What do biogeographic studies tell us about migratory birds?
- What is the evolutionary significance of migration in birds?
- Can shorebirds fly in the reverse?
- How does winter habitat affect bird survival?
- Is biannual migration in birds a genetic trait?
- What drives long-distance intercontinental migration in birds?
- Is there a genetic component to migration?
What is a partial migration?
Most species of migratory birds may be partial migrants, meaning that some populations or individuals within the species migrate while others stay put. A fraction of American robins, for example, remain near their breeding grounds across seasons while others travel south and then return north.
What is an intra-African migrant bird?
Breeding and non-breeding migrant birds speak for themselves and as mentioned in my previous post, they fall under our two main categories either Intra African migrants or Afro Palearctic migrants. In this post, I would like to explain what we mean by Intra-African migrants.
How much do we know about migratory bird migration patterns?
“It is surprising how much remains unknown about the seasonal movements of most partial migrant species, and this is especially true for variability among populations,” adds the Smithsonian Migratory Bird Center’s Emily Cohen, an expert on migration patterns who was not involved with the study.
What is partial migration in biology?
Partial migration occurs when only a fraction of the population migrates, distinguishing migrant from nonmigrant individuals (Chapman et al., 2011a; Dingle, 1996). Partial migration has been documented in invertebrates, fish, birds, and mammals (Chapman et al., 2011a (Chapman et al., , 2011. …
Is irruptive migration fundamentally different from conventional migration of birds?
We do not know whether the movements of irruptive migrants are fundamentally different from more conventional migration of birds to their wintering areas because irruptive migration has never been thoroughly described for any species on a continent-wide scale.
What is the most common type of migration?
Th e most common type of migration is known as ‘ partial migration ‘ , which is characterised by within-population variation in migratory tendency such that just a fraction of the population migrates (Lack 1943). Hence partially migratory populations consist of both migratory and resident individuals.
What do we know about intra-African migratory patterns?
Migration is better studied than moult, but little is known about the migratory routes of intra-continental migrant birds in Africa compared to inter-continental migrants. Phoebe Barnard recruited Post-doc Dayo Osinubi in 2015 to start an intra-African migration project to investigate the migratory patterns of selected intra-African migrant birds.
Do genetics explain migration patterns?
Even though the ecological causes for the evolution and maintenance of partial migration have been widely discussed, the consequences of the genetics underlying differences in migration patterns have been little acknowledged.
What happens to lost young birds when they migrate?
Most of these lost young birds perish in unsuitable wintering grounds, but there is some evidence that a few survive, and either re-orient in successive winters, or even return to the same area. 3.1 Reverse migration is the opposite direction or random directions? Some large birds such as swans learn migration routes from their parents.
Is it possible to reverse a bird’s migration?
As migration is most often genetically programmed before birth into most birds there can be rare variations and defects that change the migration programming. These variations will account for some but not all of the reverse migration cases.
Why are breeding and wintering sites important to migratory birds?
It is not only the breeding and wintering sites which are important, as these feeding and resting sites also fulfil important roles in the biology of migratory birds.
Is migratory behavior inherited?
Genetic Control of Migratory Behaviour in Birds Peter Berthold Although it has long been suspected that biannual migration in birds has a direct genetic basis, only in the last decade have details of the inheritance of behavioural traits such as migratory activity and directional preferences been demonstrated.
What do we know about migration genetics?
Practically all of our present knowledge on the genetics of migration is based on experimental studies in a few model species—the blackcap being by far the best studied—all of which are passerines breeding in the Western Palaearctic and wintering in southern Europe or northern Africa.
What do biogeographic studies tell us about migratory birds?
Biogeographic studies comparing range sizes and distributions of migratory and resident birds species come to similar conclusions.
What is the evolutionary significance of migration in birds?
The genetic explanation for the evolutionary lability of migratory behavior in birds can be derived directly from the mode of inheritance of migratory activity, which is best described by the threshold model of quantitative genetics (figure 1; Pulido et al. 1996, Roff and Fairbairn 2007).
Can shorebirds fly in the reverse?
The reverse migration behaviour has also been seen in the shorebirds red knots who fly in the reverse to typical migration direction. These red knot shorebirds who travel 200 km reverse migration behaviour have been documented over the last 10 years and is a common occurrence.
How does winter habitat affect bird survival?
There is some evidence that winter habitat does influence survival through its effects on body condition. For example, canvasbacks in the Chesapeake Bay that had high winter body weights survived better than birds of lower body mass.
Is biannual migration in birds a genetic trait?
Although it has long been suspected that biannual migration in birds has a direct genetic basis, only in the last decade have details of the inheritance of behavioural traits such as migratory activity and directional preferences been demonstrated.
What drives long-distance intercontinental migration in birds?
Before genetic control mechanisms for migration in birds had been demonstrated, ‘endogenous’ factors affecting long-distance intercontinental migration had been postulated. These factors had been documented in the 1970s and were termed ‘circannual rhythms’ or ‘internal calendars”~2.
Is there a genetic component to migration?
Researchers have known for a few decades that there is a genetic component to migration. Recent studies in birds have identified large regions of the genome, encompassing hundreds of genes, associated with migration, but it has been more difficult to pinpoint the specific roles of any single gene.