by Mark Lasbury in As Many Exceptions As Rules
You see a spotted hyena – is it a male or female. There’s no way of telling without a blood test or a litter of pups. Other animals have obvious differences between males and females; eclectus parrots have green males but red and blue females, while male elephant seals weigh 10x as much as females. Are the differences for sexual selection or natural selection?... Read more »
Dunn, P., Armenta, J., & Whittingham, L. (2015) Natural and sexual selection act on different axes of variation in avian plumage color. Science Advances, 1(2). DOI: 10.1126/sciadv.1400155
Neumann, D., & Kureck, A. (2013) Composite structure of silken threads and a proteinaceous hydrogel which form the diving bell wall of the water spider Agyroneta aquatica. SpringerPlus, 2(1), 223. DOI: 10.1186/2193-1801-2-223
Cunha, G., Risbridger, G., Wang, H., Place, N., Grumbach, M., Cunha, T., Weldele, M., Conley, A., Barcellos, D., Agarwal, S.... (2014) Development of the external genitalia: Perspectives from the spotted hyena (Crocuta crocuta). Differentiation, 87(1-2), 4-22. DOI: 10.1016/j.diff.2013.12.003
Hammond, G., Miguel-Queralt, S., Yalcinkaya, T., Underhill, C., Place, N., Glickman, S., Drea, C., Wagner, A., & Siiteri, P. (2012) Phylogenetic Comparisons Implicate Sex Hormone-Binding Globulin in “Masculinization” of the Female Spotted Hyena . Endocrinology, 153(3), 1435-1443. DOI: 10.1210/en.2011-1837
Krüger, O. (2005) The Evolution of Reversed Sexual Size Dimorphism in Hawks, Falcons and Owls: A Comparative Study. Evolutionary Ecology, 19(5), 467-486. DOI: 10.1007/s10682-005-0293-9
by beredim in Strange Animals
Edwardsiella andrillae
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Order: Actiniaria
Family: Edwardsiidae
Genus: Edwardsiella
Species: Edwardsiella andrillae
Meet Edwardsiella andrillae, a recently discovered species of sea anemone that lives anchored to the underside of sea ice offshore of Antarctica.
The species was discovered in December 2010 during a test run of an ... Read more »
Daly, M., Rack, F., & Zook, R. (2013) Edwardsiella andrillae, a New Species of Sea Anemone from Antarctic Ice. PLoS ONE, 8(12). DOI: 10.1371/journal.pone.0083476
by beredim in Strange Animals
From pink blind fish to mushroom shaped animals to flic-flac jumping spiders, here is a pick of the weirdest animals described in 2014.
1. Hoosier cavefish (Amblyopsis hoosieri)
A live specimen of A. hoosieri, measuring 6.07 cm (2.39 in) long.
The Hoosier cavefish (Amblyopsis hoosieri) is a subterranean blind fish from southern Indiana, U.S.
First discovered during a 2013 study on ... Read more »
Chakrabarty P, Prejean JA, & Niemiller ML. (2014) The Hoosier cavefish, a new and endangered species (Amblyopsidae, Amblyopsis) from the caves of southern Indiana. ZooKeys, 41-57. PMID: 24899861
Just J, Kristensen RM, & Olesen J. (2014) Dendrogramma, new genus, with two new non-bilaterian species from the marine bathyal of southeastern Australia (Animalia, Metazoa incertae sedis)--with similarities to some medusoids from the Precambrian Ediacara. PloS one, 9(9). PMID: 25184248
Hrbek T, da Silva VM, Dutra N, Gravena W, Martin AR, & Farias IP. (2014) A new species of river dolphin from Brazil or: how little do we know our biodiversity. PloS one, 9(1). PMID: 24465386
by Mark Lasbury in As Many Exceptions As Rules
Do birds have teeth? No, but they did once, and sometimes a throwback mutation can create a chick with a full set of chompers. That’s weird, but bird mouths get weirder. Birds can open their upper jaw, not just their lower. And some birds take being weird even farther. The crossbill has a mouth where the upper and lower beaks scissor past one another while the wrybill has a beak that always turns right. ... Read more »
Meredith, R., Zhang, G., Gilbert, M., Jarvis, E., & Springer, M. (2014) Evidence for a single loss of mineralized teeth in the common avian ancestor. Science, 346(6215), 1254390-1254390. DOI: 10.1126/science.1254390
Smith, J., Sjoberg, S., Mueller, M., & Benkman, C. (2012) Assortative flocking in crossbills and implications for ecological speciation. Proceedings of the Royal Society B: Biological Sciences, 279(1745), 4223-4229. DOI: 10.1098/rspb.2012.1500
Benkman, C., Parchman, T., & Mezquida, E. (2010) Patterns of coevolution in the adaptive radiation of crossbills. Annals of the New York Academy of Sciences, 1206(1), 1-16. DOI: 10.1111/j.1749-6632.2010.05702.x
SNOWBERG, L., & BENKMAN, C. (2009) Mate choice based on a key ecological performance trait. Journal of Evolutionary Biology, 22(4), 762-769. DOI: 10.1111/j.1420-9101.2009.01699.x
by Björn Brembs in bjoern.brembs.blog
When I finished my PhD 15 years ago, the neurosciences defined the main function of brains in terms of processing input to compute output: “brain function is ultimately best understood in terms of input/output transformations and how they are produced” […] ↓ Read the rest of this entry...... Read more »
Gordus, A., Pokala, N., Levy, S., Flavell, S., & Bargmann, C. (2015) Feedback from Network States Generates Variability in a Probabilistic Olfactory Circuit. Cell. DOI: 10.1016/j.cell.2015.02.018
by Mark Lasbury in As Many Exceptions As Rules
Evolution has given the sperm whale the most amazing head in the animal kingdom. They’ve got the biggest brain – all 18 lb.s of it. It has 1900 liters of sperm oil that almost caused in the extinction of the animal. It has one nostril that’s offset on its head, making the whale asymmetric. But most impressively, he can change the density of his head to help him dive or surface, and to do it he uses the same organ he uses for echolocation!... Read more »
Ridgway, S., & Hanson, A. (2014) Sperm Whales and Killer Whales with the Largest Brains of All Toothed Whales Show Extreme Differences in Cerebellum. Brain, Behavior and Evolution, 83(4), 266-274. DOI: 10.1159/000360519
Oliveira, C., Wahlberg, M., Johnson, M., Miller, P., & Madsen, P. (2013) The function of male sperm whale slow clicks in a high latitude habitat: Communication, echolocation, or prey debilitation?. The Journal of the Acoustical Society of America, 133(5), 3135. DOI: 10.1121/1.4795798
BODDY, A., McGOWEN, M., SHERWOOD, C., GROSSMAN, L., GOODMAN, M., & WILDMAN, D. (2012) Comparative analysis of encephalization in mammals reveals relaxed constraints on anthropoid primate and cetacean brain scaling. Journal of Evolutionary Biology, 25(5), 981-994. DOI: 10.1111/j.1420-9101.2012.02491.x
Montgomery, S., Geisler, J., McGowen, M., Fox, C., Marino, L., & Gatesy, J. (2013) THE EVOLUTIONARY HISTORY OF CETACEAN BRAIN AND BODY SIZE. Evolution, 67(11), 3339-3353. DOI: 10.1111/evo.12197
by Jente Ottenburghs in Evolutionary Stories
The correspondence between Edgar Anderson and Ernst Mayr revealed a peculiar fact.... Read more »
Kleinman, K. (2012) Systematics and the Origin of Species from the Viewpoint of a Botanist: Edgar Anderson Prepares the 1941 Jesup Lectures with Ernst Mayr. Journal of the History of Biology, 46(1), 73-101. DOI: 10.1007/s10739-012-9325-9
by Amaury Avril in genome ecology evolution etc
Convergent evolution is defined by the independent evolution of similar traits in different lineages, in order to adapt to similar environmental conditions. Examples of this phenomenon include adaptations to altitude in humans, independent evolution of flight in birds and bats … Continue reading →... Read more »
Foote, A., Liu, Y., Thomas, G., Vinař, T., Alföldi, J., Deng, J., Dugan, S., van Elk, C., Hunter, M., Joshi, V.... (2015) Convergent evolution of the genomes of marine mammals. Nature Genetics, 47(3), 272-275. DOI: 10.1038/ng.3198
by GrrlScientist in Maniraptora
SUMMARY: In this fascinating video, Professor Ros Rickaby from Oxford chats with Professor Simon Conway-Morris at Cambridge about how Earth’s changing chemistry has affected evolution, and how this can sometimes lead to evolutionary convergence... Read more »
Williams R. J. P. (1981) The Bakerian Lecture, 1981: Natural Selection of the Chemical Elements. Proceedings of the Royal Society B: Biological Sciences, 213(1193), 361-397. DOI: http://dx.doi.org/10.1098/rspb.1981.0071
Cook L. M., I. J. Saccheri, & J. Mallet. (2012) Selective bird predation on the peppered moth: the last experiment of Michael Majerus. Biology Letters, 8(4), 609-612. DOI: http://dx.doi.org/10.1098/rsbl.2011.1136
Dhingra A., & H. Daniell. (2004) Enhanced translation of a chloroplast-expressed RbcS gene restores small subunit levels and photosynthesis in nuclear RbcS antisense plants. Proceedings of the National Academy of Sciences, 101(16), 6315-6320. DOI: http://dx.doi.org/10.1073/pnas.0400981101
by Mark Lasbury in As Many Exceptions As Rules
One of the most amazing animals is one of the least often seen. It has one tooth that grows into a tusk that’s off center. The tusk is basically inside out, with the inside of the tooth exposed to the world. This animal also has the world’s only spiraled tooth, for strength and because that’s what keeps it growing straight. Finally, this animal spends an amazing amount of time on its back. Why do we care about these animal…..because they are so awesome!... Read more »
Christen AG, & Christen JA. (2011) The unicorn and the narwhal: a tale of the tooth. Journal of the history of dentistry, 59(3), 135-42. PMID: 22372187
Kingsley, M., & Ramsay, M. (1988) The Spiral in the Tusk of the Narwhal. ARCTIC, 41(3). DOI: 10.14430/arctic1723
Nweeia, M., Eichmiller, F., Hauschka, P., Donahue, G., Orr, J., Ferguson, S., Watt, C., Mead, J., Potter, C., Dietz, R.... (2014) Sensory ability in the narwhal tooth organ system. The Anatomical Record, 297(4), 599-617. DOI: 10.1002/ar.22886
Dietz, R., Shapiro, A., Bakhtiari, M., Orr, J., Tyack, P., Richard, P., Eskesen, I., & Marshall, G. (2007) Upside-down swimming behaviour of free-ranging narwhals. BMC Ecology, 7(1), 14. DOI: 10.1186/1472-6785-7-14
by Mark Lasbury in As Many Exceptions As Rules
The Cyclops had one eye in the middle of his forehead, but can you think of real animal with only one eye? Two eyes (or more) seem to be very important in evolution. This is so true that when flatfish lie down on the ocean floor they move one eye to the other side of their head! Research is showing that it’s more than just their eye that changes and the alterations are important for their survival. And by the way – there is one kind of animal that only has one eye, it’s the &he........; Read more »
MacDonald P. (2013) A rare occurrence of reversal in the common megrim Lepidorhombus whiffiagonis (Pleuronectiformes: Scophthalmidae) in the northern North Sea. Journal of fish biology, 83(3), 691-4. PMID: 23991885
Suzuki, T., Washio, Y., Aritaki, M., Fujinami, Y., Shimizu, D., Uji, S., & Hashimoto, H. (2009) Metamorphic pitx2 expression in the left habenula correlated with lateralization of eye-sidedness in flounder. Development, Growth , 51(9), 797-808. DOI: 10.1111/j.1440-169X.2009.01139.x
Goto T. (2009) Reversals in two dextral flounder species, Microstomus achne and Cleisthenes pinetorum (Pleuronectida; Teleostei), from Japan. Journal of fish biology, 74(3), 669-73. PMID: 20735586
BERGSTROM, C. (2007) Morphological evidence of correlational selection and ecological segregation between dextral and sinistral forms in a polymorphic flatfish, Platichthys stellatus. Journal of Evolutionary Biology, 20(3), 1104-1114. DOI: 10.1111/j.1420-9101.2006.01290.x
Friedman, M. (2008) The evolutionary origin of flatfish asymmetry. Nature, 454(7201), 209-212. DOI: 10.1038/nature07108
by Lucas Marques Da Cunha in genome ecology evolution etc
The monarch butterfly (Danaus plexippus) has a large distribution worldwide. It occurs in North, Central, and South America, Caribbean, and it has recently dispersed to other locations, such as Oceania and Africa. Two traits of this butterfly are incredibly intriguing: … Continue reading →... Read more »
Zhan, S., Zhang, W., Niitepõld, K., Hsu, J., Haeger, J., Zalucki, M., Altizer, S., de Roode, J., Reppert, S., & Kronforst, M. (2014) The genetics of monarch butterfly migration and warning colouration. Nature, 514(7522), 317-321. DOI: 10.1038/nature13812
by Mark Lasbury in As Many Exceptions As Rules
Not every animal that’s bilaterally symmetric chooses to stay that way. Some parasitic worms must become asymmetric in order to attach to fish gills, and some fish have mouths that turn to the right or left for lepidophagy. What’s lepidophagy you ask? They rip off and eat the scales of other fish!... Read more »
Takeuchi, Y., Hori, M., & Oda, Y. (2012) Lateralized Kinematics of Predation Behavior in a Lake Tanganyika Scale-Eating Cichlid Fish. PLoS ONE, 7(1). DOI: 10.1371/journal.pone.0029272
Lee, H., Kusche, H., & Meyer, A. (2012) Handed Foraging Behavior in Scale-Eating Cichlid Fish: Its Potential Role in Shaping Morphological Asymmetry. PLoS ONE, 7(9). DOI: 10.1371/journal.pone.0044670
Kusche, H., Lee, H., & Meyer, A. (2012) Mouth asymmetry in the textbook example of scale-eating cichlid fish is not a discrete dimorphism after all. Proceedings of the Royal Society B: Biological Sciences, 279(1748), 4715-4723. DOI: 10.1098/rspb.2012.2082
Takahashi, T., & Hori, M. (2008) Evidence of disassortative mating in a Tanganyikan cichlid fish and its role in the maintenance of intrapopulation dimorphism. Biology Letters, 4(5), 497-499. DOI: 10.1098/rsbl.2008.0244
Hori, M., Ochi, H., & Kohda, M. (2007) Inheritance Pattern of Lateral Dimorphism in Two Cichlids (a Scale Eater, Perissodus microlepis, and an Herbivore, Neolamprologus moorii) in Lake Tanganyika. Zoological Science, 24(5), 486-492. DOI: 10.2108/zsj.24.486
by Mark Lasbury in As Many Exceptions As Rules
Heads and symmetric bodies didn’t necessarily evolve at the same time, but we don’t know which was first. Some animals have heads and bilateral bodies, and some have radial bodies and no heads. Are there any in between? Yes, and no, but why would any group of animals lose heads after they had evolved them?... Read more »
Moroz, L., Kocot, K., Citarella, M., Dosung, S., Norekian, T., Povolotskaya, I., Grigorenko, A., Dailey, C., Berezikov, E., Buckley, K.... (2014) The ctenophore genome and the evolutionary origins of neural systems. Nature, 510(7503), 109-114. DOI: 10.1038/nature13400
Holló, G., & Novák, M. (2012) The manoeuvrability hypothesis to explain the maintenance of bilateral symmetry in animal evolution. Biology Direct, 7(1), 22. DOI: 10.1186/1745-6150-7-22
Wallberg, A., Thollesson, M., Farris, J., & Jondelius, U. (2004) The phylogenetic position of the comb jellies (Ctenophora) and the importance of taxonomic sampling. Cladistics, 20(6), 558-578. DOI: 10.1111/j.1096-0031.2004.00041.x
Astley HC. (2012) Getting around when you're round: quantitative analysis of the locomotion of the blunt-spined brittle star, Ophiocoma echinata. The Journal of experimental biology, 215(Pt 11), 1923-9. PMID: 22573771
by GrrlScientist in Maniraptora
SUMMARY: Instead of travelling to remote locations in faraway countries, scientists sometimes discover a new species by looking a little more closely at an old specimen in a museum drawer.... Read more »
Helgen Kristofer M., Roland Kays, Lauren Helgen, Mirian Tsuchiya, Aleta Quinn, Don Wilson, & Jesus Maldonado. (2013) Taxonomic revision of the olingos (Bassaricyon), with description of a new species, the Olinguito. ZooKeys, 1-83. DOI: http://dx.doi.org/10.3897/zookeys.324.5827
by Mark Lasbury in As Many Exceptions As Rules
Extended spaceflight can wreak havoc on your body – your bones, muscles, brain and vestibular system all pay the price for exploration. And while your body might adapt to space, big problems can occur when you return to Earth gravity. You go into space as a virile astronaut, but return as fragile as a your great grandmother. ... Read more »
Finetti, F., Paccani, S., Rosenbaum, J., & Baldari, C. (2011) Intraflagellar transport: a new player at the immune synapse. Trends in Immunology, 32(4), 139-145. DOI: 10.1016/j.it.2011.02.001
Conroy, P., Saladino, C., Dantas, T., Lalor, P., Dockery, P., & Morrison, C. (2014) C-NAP1 and rootletin restrain DNA damage-induced centriole splitting and facilitate ciliogenesis. Cell Cycle, 11(20), 3769-3778. DOI: 10.4161/cc.21986
Troshichev, O., Gorshkov, E., Shapovalov, S., Sokolovskii, V., Ivanov, V., & Vorobeitchikov, V. (2004) Variations of the gravitational field as a motive power for rhythmics of biochemical processes. Advances in Space Research, 34(7), 1619-1624. DOI: 10.1016/j.asr.2004.02.013
Fitts, R., Trappe, S., Costill, D., Gallagher, P., Creer, A., Colloton, P., Peters, J., Romatowski, J., Bain, J., & Riley, D. (2010) Prolonged space flight-induced alterations in the structure and function of human skeletal muscle fibres. The Journal of Physiology, 588(18), 3567-3592. DOI: 10.1113/jphysiol.2010.188508
Rimmer J, Patel M, Agarwal K, Hogg C, Arshad Q, & Harcourt J. (2014) Peripheral Vestibular Dysfunction in Patients with Primary Ciliary Dyskinesia: Abnormal Otoconial Development?. Otology . PMID: 25226371
by Marc in Teaching Biology
Earthworm taxonomists describing what they do to a layperson is hilarious to watch. Laypeople often have a difficult time understanding the concept of a species - you will regularly hear statements that there are only 50 insect species, for example. Insect species often differ in colour and patterning, so it’s easy to then correct a layman’s misconceptions about […]
The post The Tree of Earthworms appeared first on Teaching Biology.
... Read more »
Domínguez, J., Aira, M., Breinholt, J., Stojanovic, M., James, S., & Pérez-Losada, M. (2015) Underground evolution: New roots for the old tree of lumbricid earthworms. Molecular Phylogenetics and Evolution, 7-19. DOI: 10.1016/j.ympev.2014.10.024
by David Steen in Living Alongside Wildlife
Pictures courtesy of Lucasfilm and J. Armbruster
Leaving the movie theater in 1977, with Greedo's death at the hands of Han Solo a fresh memory, a young Jon Armbruster could not have anticipated the role that Jabba the Hutt's go-to bounty hunter would play in his scientific contributions decades later.
And yet...when he (along with Auburn University researchers Milton Tan, Christopher... Read more »
Armbruster, J., Werneke, D., & Tan, M. (2015) Three new species of saddled loricariid catfishes, and a review of Hemiancistrus, Peckoltia, and allied genera (Siluriformes). ZooKeys, 97-123. DOI: 10.3897/zookeys.480.6540
by Mark Lasbury in As Many Exceptions As Rules
As with so many other things, we learn biology best by studying what happens when things go wrong. You won’t believe the diseases that are being linked to this most innocuous of cell structures. Without any exaggeration, primary cilia make you smart, skinny, and happy. Let’s find out how.... Read more »
Tong, C., Han, Y., Shah, J., Obernier, K., Guinto, C., & Alvarez-Buylla, A. (2014) Primary cilia are required in a unique subpopulation of neural progenitors. Proceedings of the National Academy of Sciences, 111(34), 12438-12443. DOI: 10.1073/pnas.1321425111
Han, Y., Kang, G., Byun, K., Ko, H., Kim, J., Shin, M., Kim, H., Gil, S., Yu, J., Lee, B.... (2014) Leptin-promoted cilia assembly is critical for normal energy balance. Journal of Clinical Investigation, 124(5), 2193-2197. DOI: 10.1172/JCI69395
Davenport JR, Watts AJ, Roper VC, Croyle MJ, van Groen T, Wyss JM, Nagy TR, Kesterson RA, & Yoder BK. (2007) Disruption of intraflagellar transport in adult mice leads to obesity and slow-onset cystic kidney disease. Current biology : CB, 17(18), 1586-94. PMID: 17825558
Keryer, G., Pineda, J., Liot, G., Kim, J., Dietrich, P., Benstaali, C., Smith, K., Cordelières, F., Spassky, N., Ferrante, R.... (2011) Ciliogenesis is regulated by a huntingtin-HAP1-PCM1 pathway and is altered in Huntington disease. Journal of Clinical Investigation, 121(11), 4372-4382. DOI: 10.1172/JCI57552
Miyoshi, K., Kasahara, K., Miyazaki, I., & Asanuma, M. (2009) Lithium treatment elongates primary cilia in the mouse brain and in cultured cells. Biochemical and Biophysical Research Communications, 388(4), 757-762. DOI: 10.1016/j.bbrc.2009.08.099
by Mark Lasbury in As Many Exceptions As Rules
Nothing is simple, and we wouldn’t want it that way. The cilia on cells; they’re for propelling a cell forward or back, or for moving fluid past the cell. Unless they don’t move at all. Could a broken cilium be important to us? You bet, they control every part of our lives. And some aren’t even cilia; sterocilia are made completely differently, but the diseases of cilia affect sterocilia as well – they can make you blind, deaf and unbalanced.... Read more »
Mathur P, & Yang J. (2014) Usher syndrome: Hearing loss, retinal degeneration and associated abnormalities. Biochimica et biophysica acta, 1852(3), 406-420. PMID: 25481835
Doroquez DB, Berciu C, Anderson JR, Sengupta P, & Nicastro D. (2014) A high-resolution morphological and ultrastructural map of anterior sensory cilia and glia in Caenorhabditis elegans. eLife. PMID: 24668170
Patel, A. (2014) The Primary cilium calcium channels and their role in flow sensing. Pflügers Archiv - European Journal of Physiology, 467(1), 157-165. DOI: 10.1007/s00424-014-1516-0
Fry AM, Leaper MJ, & Bayliss R. (2014) The primary cilium: guardian of organ development and homeostasis. Organogenesis, 10(1), 62-8. PMID: 24743231
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