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Notes on video lecture:
Hominin Species and Speciation
Notes taken by Edward Tanguay on March 26, 2017 (go to class or lectures)
Choose from these words to fill the blanks below:
look, gradual, biological, anamensis, million, smaller, fossil, hominim, bonobos, reproducing, East, reproduction, bounded, humans, morphologically, differences, protecting, afarensis, replace, habitats, naturalists, relationship, anatomical, Sex, natural, paleoanthropologists, range, accepted, complete, clearly
why are species from each other
we would expect to find
changes in the fossil record
gradual gradations among living organisms, i.e. a continuous of species of animals
explanation
as gradual changes occurred, they became more and more adapted to smaller
those gradations gave rise to large populations and populations
more populous species would continually the smaller ones
in Darwin's day, the fossil record was not very
today we have extraordinary records of some lineages
hominins
from Australopithecus
to Australopithecus
two species that lived between 4.2 and 2.9 million years ago
across much of Africa
we see in them a record of gradual change
in Darwin's time, species were simply what said they were
they understood the morphological variation, i.e. study of the size and shape of features
Darwin's book: The Descent of Man, and Selection in Relation to
concerned with the topic of whether different kinds of should be called different species or not
"It is a hopeless endeavor to decide this point until some definition of the term species is generally . We might as well attempt without any definition to decide whether certain number of houses should be called a village, town, or city. We have a practical illustration of the difficulty in the never-ending doubts of whether many closely allied birds, mammals, insects, and plants which represent each other respectively in North America and Europe should be ranked as species or geographical races."
when name species in much the same way today, just in more sophisticated terms
the evidence that we use to decide whether members of a species have a close is not often evidence that is closely at hand
the species concept
a species is a population that includes all of the populations that can actually or potentially reproduce with each other in their habitat
this definition focuses on
it doesn't matter in principle how different the members of these species
as long as they are with each other in their natural habitats, in their natural populations
chimpanzees
exist in at least four sub-populations across equatorial Africa
their close relatives the separated from the chimpanzees more than a million years ago
chimpanzee subspecies have existed for more than a half- years
there is not much evidence that early hominim populations were comparable in their to one another as we see with chimpanzees and bonobos
but the difference between sub-species and species can be seen as arbitrary and depends on one's intentions
many conservation biologies who are concerned about chimpanzees want to emphasize the biological differences between the different groups and would prefer that different sub-species be called different species
many biologies who are studying the fossil record who are trying to understand how various fossil forms are different and might be related to each other, are not ready to test how different those morphological differences are consistent with populations who are exchanging significant amounts of genes
Australopithecus afarensis is a descendant of Australopithecus anamensis
why don't we just call them one species?
we don't know that Australopithecus afarensis is the only decendent of Australopithecus anamensis
we later have more evidence of various groups adapting to different kinds of ecologies
but until there is more information, paleontologists prefer to give groups names so they can communicate about them
but we often don't have enough information to know when and where major changes might have arisen
the name gives paleontologists a way to deal with variation and to approach the hypotheses
when it is argued whether a species is valid or not, it is being argued whether one can trace the record with the evidence that is available, or whether addition discoveries need to be made to find the common ancestors of these groups
Spelling Corrections:
decendent ⇒ descendant
paleonthologist ⇒ paleontologist
Ideas and Concepts:
Edgy definitions via this morning's Human Evolution course:
"In Darwin's book, 'The Descent of Man, and Selection in Relation to Sex', he was concerned with the topic of whether different kinds of humans should be called different species or not.
He writes, 'It is a hopeless endeavor to decide this point until some definition of the term species is generally accepted. We might as well attempt without any definition to decide whether certain number of houses should be called a village, town, or city. We have a practical illustration of the difficulty in the never-ending doubts of whether many closely allied birds, mammals, insects, and plants which represent each other respectively in North America and Europe should be ranked as species or geographical races.
Paleoanthropologists name species in much the same way today, it is just that they use more sophisticated terms. But much of the evidence that we use to decide whether members of a species have a close relationship or not is not often evidence that is closely at hand.
The most common criteria used today to determine species is called the biological species concept which basically states that a species is a population that includes all of the populations that can actually or potentially reproduce with each other in their natural habitat. This definition focuses on reproduction, so it doesn't matter in principle how different the members of these species look or are formed, as long as they are reproducing with each other in their natural habitats, in their natural populations."
"In Darwin's book, 'The Descent of Man, and Selection in Relation to Sex', he was concerned with the topic of whether different kinds of humans should be called different species or not.
He writes, 'It is a hopeless endeavor to decide this point until some definition of the term species is generally accepted. We might as well attempt without any definition to decide whether certain number of houses should be called a village, town, or city. We have a practical illustration of the difficulty in the never-ending doubts of whether many closely allied birds, mammals, insects, and plants which represent each other respectively in North America and Europe should be ranked as species or geographical races.
Paleoanthropologists name species in much the same way today, it is just that they use more sophisticated terms. But much of the evidence that we use to decide whether members of a species have a close relationship or not is not often evidence that is closely at hand.
The most common criteria used today to determine species is called the biological species concept which basically states that a species is a population that includes all of the populations that can actually or potentially reproduce with each other in their natural habitat. This definition focuses on reproduction, so it doesn't matter in principle how different the members of these species look or are formed, as long as they are reproducing with each other in their natural habitats, in their natural populations."