Results 81 to 90 of about 949 (172)

When males and hermaphrodites coexist: a review of androdioecy in animals [PDF]

Integrative and Comparative Biology, 2006
Androdioecy (populations consisting of males and hermaphrodites) is a rare mating system in plants and animals: up to 50 plants and only 36 animals have been described as being androdioecious, with most of the latter being crustaceans. To date, a thorough comparative analysis of androdioecy in animals has not been undertaken.
Stephen C, Weeks, Chiara, Benvenuto, Sadie K, Reed   +2 more
openaire   +2 more sources

Sex chromosome evolution in the clam shrimp Eulimnadia texana

Invertebrate Biology, Volume 143, Issue 2, June 2024.
Abstract Sex chromosome degeneration is documented in various animal taxa and is predicted to be due, in part, to a buildup of transposable elements (TE) on the non‐recombining sex chromosome (Y in mammals and W in many crustaceans). Recombination in XX (or ZZ) individuals is predicted to reduce the buildup of TEs on the X (Z), but because there are no
Connor Lang, Chathumadavi Ediriweera, Stephen C. Weeks   +2 more
wiley   +1 more source

Multiple global radiations in tadpole shrimps challenge the concept of ‘living fossils’ [PDF]

, 2013
‘Living fossils’, a phrase first coined by Darwin, are defined as species with limited recent diversification and high morphological stasis over long periods of evolutionary time.
Avise, Barnard, Burbrink, Casane, Darwin, Drummond, Drummond, Edgar, Eldredge, Fayers, Fedonkin, Fryer, Gall, Gand, Garrouste, Gore, Green, Harvey, Haughton, Hegna, Ho, Kano, King, Korn, Korn, Kotov, Lanfear, Macdonald, Mantovani, Mathers, Nagalingum, Obst, Olesen, Pacheco, Phillimore, Pons, Rabosky, Regier, Reznick, Rhodes, Rogers, Ronquist, Stamatakis, Tamura, Trusheim, van Leeuwen, Vanschoenwinkel, von Reumont, Waloßek, Weeks, Womack, Wray, Zierold, Zierold   +53 more
core   +3 more sources

Harmful self‐pollination drives gynodioecy in European chestnut, a self‐incompatible tree

American Journal of Botany, Volume 111, Issue 5, May 2024.
Abstract Premise Gynodioecy is a rare sexual system in which two genders (sensu Lloyd, 1980), cosexuals and females, coexist. To survive, female plants must compensate for their lack of siring capacity and male attractiveness. In European chestnut (Castanea sativa), an outcrossing tree, self‐pollination reduces fruit set in cosexual individuals because
Clément Larue, Rémy J. Petit
wiley   +1 more source

The evolution of unisexual flowers in the Annonaceae: evidence from Pseuduvaria mulgraveana [PDF]

, 2012
Insect-Plant evolutionary ecology (Session I)The early-divergent angiosperm family Annonaceae has predominantly hermaphroditic flowers, although unisexuality has evolved in several disparate lineages.
Pang, CC, Saunders, RMK, Scharaschkin, T, Su, YCF   +3 more
core  

Natural hybridization between divergent lineages in a selfing hermaphroditic fish. [PDF]

, 2018
By definition, mating between individuals is infrequent in highly selfing organisms, and so too, therefore, hybridization should be rare between genetically divergent lineages in predominantly self-fertilizing species. Notwithstanding these expectations,
Avise, John C, Davis, William P, Earley, Ryan L, Tatarenkov, Andrey, Taylor, D Scott   +4 more
core   +2 more sources

Let's talk about sex: Mechanisms of neural sexual differentiation in Bilateria

WIREs Mechanisms of Disease, Volume 16, Issue 2, March/April 2024.
In many animals, sex differentiation of neural circuits involves two axes: Along the first axis, particular classes of neurons are specified to produce a sex‐sensitive factor; this specification event is sex‐neutral. Along the second axis, sex information is imposed on this sex‐sensitive factor, either through hormonal or cell‐autonomous mechanisms ...
Emma C. Roggenbuck, Elijah A. Hall, Isabel B. Hanson, Alyssa A. Roby, Katherine K. Zhang, Kyle A. Alkatib, Joseph A. Carter, Jarred E. Clewner, Anna L. Gelfius, Shiyuan Gong, Finley R. Gordon, Jolene N. Iseler, Samhita Kotapati, Marilyn Li, Areeba Maysun, Elise O. McCormick, Geetanjali Rastogi, Srijani Sengupta, Chantal U. Uzoma, Madison A. Wolkov, E. Josephine Clowney   +20 more
wiley   +1 more source

Young evolutionary origins of dioecy in the genus Asparagus

American Journal of Botany, Volume 111, Issue 2, February 2024.
Abstract Premise Dioecy (separate sexes) has independently evolved numerous times across the angiosperm phylogeny and is recently derived in many lineages. However, our understanding is limited regarding the evolutionary mechanisms that drive the origins of dioecy in plants.
Philip C. Bentz, Zhengjie Liu, Jun‐Bo Yang, Le Zhang, Sandra Burrows, John Burrows, Akira Kanno, Zichao Mao, Jim Leebens‐Mack   +8 more
wiley   +1 more source

Clones, hermaphrodites and pregnancies: Nature's oddities offer evolutionary lessons on reproduction [PDF]

, 2011
I love the term 'natural history' because it encapsulates the sentiment that nature's operations have evolutionary etiologies. Charles Darwin was a natural historian par excellence and his elucidation of natural selection, artificial selection, and ...
Avise, JC
core   +2 more sources

Regional variation in sex ratios and sex allocation in androdioecious Mercurialis annua [PDF]

Journal of Evolutionary Biology, 2014
AbstractIn androdioecious metapopulations, where males co‐occur with hermaphrodites, the absence of males from certain populations or regions may be explained by locally high selfing rates, high hermaphrodite outcross siring success (e.g. due to high pollen production by hermaphrodites), or to stochastic processes (e.g.
J R, Pannell, S M, Eppley, M E, Dorken, R, Berjano   +3 more
openaire   +2 more sources