Navigation Links
Why are there so many species of beetles and so few crocodiles?
Date:8/28/2012

There are more than 400,000 species of beetles and only two species of the tuatara, a reptile cousin of snakes and lizards that lives in New Zealand. Crocodiles and alligators, while nearly 250 million years old, have diversified into only 23 species. Why evolution has produced "winners" including mammals and many species of birds and fish and "losers" is a major question in evolutionary biology.

Scientists have often posited that because some animal and plant lineages are much older than others, they have had more time to produce new species (the dearth of crocodiles notwithstanding). This idea that time is an important predictor of species number underlies many theoretical models used by biologists. However, it fails to explain species numbers across all multi-cellular life on the planet, a team of life scientists reports Aug. 28 in the online journal PLoS Biology, a publication of the Public Library of Science.

"We found no evidence of that," said Michael Alfaro, a UCLA associate professor of ecology and evolutionary biology and senior author of the new study. "When we look across the tree of life, the age of the group tells us almost nothing about how many species we would expect to find. In most groups, it tells us nothing."

Another idea, that some groups are innately better or worse at producing species, similarly fails to explain differences in species number among all of the major living lineages of plants and animals, the life scientists found.

"We know that some groups, like flowering plants or cichlid fishes, have been exceptionally good at producing species during certain periods of their evolutionary history," Alfaro said. "However, when we look at the ages of all of the major groups of plants and animals, these differences in speciation rate are not sufficient to explain the differences in species number that exist in extant groups."

Alfaro and his colleagues studied 1,397 major groups of multi-cellular eukaryotes including animals, plants and fungi that account for 1.2 million species. Working as "evolutionary detectives," they were able to see whether the groups that split the earliest tended to have the most species. They assigned a "species richness score" to these 1,397 groups, using novel statistical and computational methods they developed.

If age does not explain species diversity, an alternative idea is that a lineage will produce species up until the point that it fills an "adaptive zone" that allows a maximum number of species, Alfaro said. In other words, a lineage of bats, whales or penguins has a maximum capacity that is determined by habitat requirements and competitors.

When an adaptive zone is first colonized, the growth of new species will be rapid, up until that limit has been reached. Once a zone is full, this speciation rate will level off. New species will not emerge until one of two events occurs: First, an existing species may go extinct, in which case it may be replaced. Second, a species within the adaptive zone may evolve a new trait sharp teeth, wings, chemical defenses or camouflage, for example that confers a significant ecological advantage and takes it into a new adaptive zone, creating opportunities for new species to emerge, Alfaro said.

"Adaptive zones are an old idea in evolutionary biology, but there is little understanding of whether speciation rates or adaptive zones are more important in explaining species richness across the tree of life," Alfaro said. "If adaptive zones control biodiversity at the broadest scales, then the rate of species growth will be a good explanation of species richness only right after a lineage has entered into a new adaptive zone. Once the adaptive zone has filled up, then, no matter how much time goes by, the number of species will not change much."

Thus, these adaptive zones, which Alfaro also calls "ecological limits," serve to restrict the number of new species that can emerge.

"Most of the groups that we studied have hit their limits," he said. "Ecological limits can explain the data we see. What's really driving things is how many times lineages evolve new innovations that move them into new adaptive zones.

"The ultimate goal in our field is to have a reconstruction of the entire evolutionary history of all species on the planet," Alfaro added. "Here we provide a piece of the puzzle. Our study sheds light on the causal factors of biodiversity across the tree of life."


'/>"/>

Contact: Stuart Wolpert
swolpert@support.ucla.edu
310-206-0511
University of California - Los Angeles
Source:Eurekalert  

Related biology news :

1. Overweight? Theres a vaccine for that
2. Feathered saurians -- downy dinosaur discovered
3. Theres more star-stuff out there but its not dark matter
4. UGA study finds theres not always safety in numbers when it comes to extinction risk
5. Professor known for work with hunter-gatherers elected to American Academy of Arts and Sciences
6. Botany student proves New England Banksia a distinct species
7. Darwin discovered to be right: Eastern Pacific barrier is virtually impassable by coral species
8. Losing stream in our battle to predict and prevent invasive species
9. Natural regeneration building urban forests, altering species composition
10. Studies shed light on why species stay or go in response to climate change
11. Triage for plants: NYBG scientists develop and test rapid species conservation assessment technique
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Why are there so many species of beetles and so few crocodiles?
(Date:1/20/2016)... , Jan. 20, 2016   MedNet Solutions ... the entire spectrum of clinical research, is pleased to ... MedNet,s significant achievements are the result of the company,s ... iMedNet eClinical , it,s comprehensive, easy-to-use and ... --> Key MedNet growth achievements in ...
(Date:1/13/2016)... York , January 13, 2016 ... Research has published a new market report titled - Biometric ... Trends, and Forecast, 2015 - 2023. According to the report, ... 2014 and is anticipated to reach US$1,625.8 mn by ... to 2023. In terms of volume, the biometric sensors ...
(Date:1/8/2016)... ANGELES and MANCHESTER, United Kingdom ... ("BBI"), a developer of innovative sensor-based diagnostic products, today announced ... financed by new and existing investors.  Proceeds from the financing ... SEM Scanner , a hand-held device for detecting early-stage pressure ... Ireland after receiving CE Mark approval. ...
Breaking Biology News(10 mins):
(Date:2/3/2016)... 2016   ViaCyte, Inc ., a leading, ... stem cell-derived islet replacement therapy for the treatment ... announced that ViaCyte and Janssen Biotech, Inc., one ... Johnson, have agreed to consolidate the assets of ... provides ViaCyte with an exclusive license to all ...
(Date:2/3/2016)... 2016  With the growing need for better ... underway, therapies such as monoclonal antibodies, recombinant protein ... of indications are in high demand. Conventionally expression ... and production of these therapeutics. However, due to ... costs, novel approaches and novel expression systems are ...
(Date:2/3/2016)... Feb. 3, 2016 Harvard Apparatus Regenerative ... company developing bioengineered organ implants for life-threatening conditions ... that CEO Jim McGorry , will present ... on Tuesday, February 9, 2016 at 8:00 ... . HART,s presentation will be webcast live ...
(Date:2/3/2016)... ... February 03, 2016 , ... Aerocom, a world-leading supplier of ... North American healthcare market. , Aerocom Healthcare, LLC will be based in Denver, ... provide new pneumatic tube systems or expand existing systems within the U.S. and ...
Breaking Biology Technology: