Abstract：
:Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm performance is therefore crucial to fully understand the evolution of male reproductive strategies. In this study, we examined the repeatability of sperm morphology and motility measures over three breeding seasons, and we studied relationships between sperm morphology and function. We conducted this study in wild-derived captive house sparrows (Passer domesticus) and Spanish sparrows (P. hispaniolensis). Results for the two species were similar. As predicted from results in other passerine species, total sperm length was highly repeatable across ejaculates, and repeatability for the length of other components was moderate. The repeatability of sperm swimming speed across ejaculates was lower, but statistically significant, suggesting that sperm velocity may be a relatively dynamic trait. Surprisingly, swimming speed did not correlate with the relative length of the midpiece, and it correlated negatively with the relative length of the flagellum and with total sperm length. This pattern is the opposite of what theory predicts and differs from what has been found in house sparrows before. Also contrary to previous work, we found no evidence that total sperm length correlates with sperm longevity. These results therefore highlight the need for a better understanding of relationships between sperm morphology and function in passerine birds.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Cramer ER,Laskemoen T,Stensrud E,Rowe M,Haas F,Lifjeld JT,Saetre GP,Johnsen Adoi
10.1002/jmor.20346subject
Has Abstractpub_date
2015-04-01 00:00:00pages
370-7issue
4eissn
0362-2525issn
1097-4687journal_volume
276pub_type
杂志文章abstract：:Serial sections were used to map the ventrally positioned neurons of the anterior nerve cord of a 12.5-day amphioxus larva from the infundibular region to the end of somite 2. Synaptic patterns reveal five categories of descending pathways, four of which are associated with the ventral compartment (VC) motoneurons res...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10114
更新日期：2003-08-01 00:00:00
abstract：:Mengenillidae is a small, basal family of Strepsiptera, mainly characterized by free-living females in contrast to the endoparasitic females of Stylopidia. Here, we describe external and internal structures of the female abdomen of Eoxenos laboulbenei (Mengenillidae). The external morphology was examined and documente...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20981
更新日期：2019-05-01 00:00:00
abstract：:Bioluminescent organs have evolved many times within teleost fishes and exhibit a wide range of complexity and anatomical derivation. Although some bioluminescent organs have been studied in detail, the morphology of the bacterial light organs in glowbellies (Acropoma) is largely unknown. This study describes the anat...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20894
更新日期：2018-11-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052220309
更新日期：1994-12-01 00:00:00
abstract：:The sharpness and thus information content of the retinal image in the eye depends on the optical quality of the lens and its accurate positioning in the eye. Multifocal lenses create well-focused color images and are present in the eyes of all vertebrate groups studied to date (mammals, reptiles including birds, amph...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10849
更新日期：2010-08-01 00:00:00
abstract：:Tooth development and replacement in fetal and adult viviparous caecilians (Amphibia: Gymnophiona) are described and analyzed according to current theories of tooth succession. The fetal dentition differs from that of the adult in morphology, position, and function. Teeth are used by fetuses to scrape the oviducal epi...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051480104
更新日期：1976-01-01 00:00:00
abstract：:The fine structure of midgut cells in two species of Cladocera (Crustacea: Branchiopoda) has unique features when it is compared to that in the midguts of other arthropods. Features which suggest that food is absorbed in digested form are: the presence of the peritrophic membrane, the glycocalyx, the almost complete a...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051500306
更新日期：1976-11-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051920304
更新日期：1987-06-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10402
更新日期：2006-03-01 00:00:00
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journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21046
更新日期：2019-10-01 00:00:00
abstract：:Based on light microscopic observations, nerve pathways are described for the first time in the praesoma of a species of the Echinorhynchidae. The pathways are described for 18 nerves, 8 paired and 2 single, which originate from the cerebral ganglion and a post-ganglionic cell and terminate in the body wall musculatur...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052010306
更新日期：1989-09-01 00:00:00
abstract：:The structures and distribution of encapsulated muscle receptors were examined in serial transverse sections of flexor carpi radialis in the adult cat. Four types of receptors (muscle spindles, Golgi tendon organs, paciniform, and Pacinian corpuscles) were identified. Their structures resembled those encountered in ot...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051830102
更新日期：1985-01-01 00:00:00
abstract：:Patterns of ectocranial suture fusion among Primates are subject to species-specific variation. In this study, we used Guttman Scaling to compare modal progression of ectocranial suture fusion among Hominidae (Homo, Pan, Gorilla, and Pongo), Hylobates, and Cercopithecidae (Macaca and Papio) groups. Our hypothesis is t...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20218
更新日期：2014-03-01 00:00:00
abstract：:The ultrastructure of the coxal glands and associated tissues in the centipedes Lithobius forficatus and Lithobius crassipes has been examined in the light of two contrasting functional hypotheses postulated by different authors. Lithobiomorph chilopods possess eight sets of pores on the posterioventral border of the ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051770204
更新日期：1983-08-01 00:00:00
abstract：:The microvasculariaztion of the lateral line organs (LLOs) of the adult pipid frog, Xenopus laevis was studied by scanning electron microscopy of vascular corrosion casts (VCCs) and correlative light microscopy of paraplast embedded tissues sections. Scanning electron micrographs of VCCs revealed that each neuromast w...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20232
更新日期：2014-05-01 00:00:00
abstract：:Mate, prey, and predator recognition often depend on the integration of information from multiple sensory modalities including visual, auditory, and/or olfactory inputs. In Crotalinae, the eyes sense visible light while the pit organs detect infrared (IR) radiation. Previous studies indicate that there is significant ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20483
更新日期：2016-01-01 00:00:00
abstract：:Among species of the Chiroptera, spermatogenesis and the fully differentiated spermatozoa differ in morphological and ultrastructural detail. This study therefore aimed to ultrastructurally characterize the spermatogenesis and the spermatozoa of Carollia perspicillata (Phyllostomidae) and compare the process with othe...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20202
更新日期：2014-01-01 00:00:00
abstract：:Analysis of lateral and dorsoventral radiographic films shows that ingestion, transport, and mastication in Pedetes capensis (Rodentia) are cyclic and their movement patterns are essentially similar for the three food types offered. During the ingestion cycle, closing of the mouth is accompanied by a backward translat...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052050310
更新日期：1990-09-01 00:00:00
abstract：:The embryonic development of the viviparous scorpion, Heterometrus fulvipes, has been followed throughout the gestation period and the successive stages of the developing embryos have been examined. The morphological features of the embryos are also described and illustrated according to their approximate age. ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051690303
更新日期：1981-09-01 00:00:00
abstract：:Oogenesis in the silkworm, Bombyx mori, was studied by light and electron microscopy of sections of resin-embedded follicles. The development of the follicles was divided into a series of 12 distinctive stages based on various morphological criteria. Structural changes in the oocyte, nurse cells, and follicle cells ar...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051790104
更新日期：1984-01-01 00:00:00
abstract：:The light microscopic analysis of serial sections of the subcommissural organ (SCO) of the rainbow trout (Salmo gairdneri) shows that the form of the groove-like (in cross section) organ varies over its total length. Its rostral origin is a tunnel-like structure anterior to the orifice of the hollow pineal stalk. The ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051960307
更新日期：1988-06-01 00:00:00
abstract：:For better understanding of the links between limb morphology and the metabolic cost of locomotion, we have characterized the relationships between limb length and shape and other functionally important variables in the straightened forelimbs and hindlimbs of a sample of 12 domestic dogs (Canis familiaris). Intra-anim...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199711)234:2<183::AID-JMOR
更新日期：1997-11-01 00:00:00
abstract：:South American Pipidae show a unique reproductive mode, in which the fertilized eggs develop in temporarily formed brood chambers of the dorsal skin after eggs have been deposited on the back of the female. We studied the skin incubation of Pipa carvalhoi using light microscopy and scanning electron microscopy. The sk...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10759
更新日期：2009-11-01 00:00:00
abstract：:Although the overall pattern and timing of gonadal sex differentiation have been established in a considerable number of teleosts, the ultrastructure of early stages of gonadal development is not well documented. In this study, gonads from larval and juvenile stages of laboratory-reared Cichlasoma dimerus were examine...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10329
更新日期：2005-05-01 00:00:00
abstract：:The function of the septomaxilla of nonmammalian synapsids has long been problematic. Distinctive features of this bone, including a prominent intranarial process and a septomaxillary canal and foramen, are characteristic of pelycosaurs and nonmammalian therapsids, but are lost in their mammalian descendants. Numerous...
journal_title：Journal of morphology
pub_type： 杂志文章,评审
doi：10.1002/1097-4687(200007)245:1<29::AID-JMOR3>3.0.C
更新日期：2000-07-01 00:00:00
abstract：:During the long starvation period (November to June) of the lizard (Varanus exanthematicus), pancreatic B cells undergo profound modification. The degeneration of beta granules observed in electron microscopy appears correlated with the diminution of the immunoreactive insulin-like content of the pancreas. The analogy...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051800302
更新日期：1984-06-01 00:00:00
abstract：:Branchial food traps are regions of specialized secretory tissue in the tadpole pharynx, where suspended food particles are trapped in mucus. Light and scanning electron microscopy were used to study branchial food traps from larvae of ten anuran families (36 species). Most anuran larvae from "advanced" (suborder Neob...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051590307
更新日期：1979-03-01 00:00:00
abstract：:The plainfin midshipman fish Porichthys notatus has both inter- and intra-sexual dimorphism in the sound-producing (vocal or sonic) muscles attached to the swimbladder wall. The "Type I" and "Type II" male morphs differ in that dramatic structural changes related to sexual maturity occur in the mass, the area of mitoc...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052160306
更新日期：1993-06-01 00:00:00
abstract：:There are remarkable interspecific differences in the sizes of the larvae of Andean frogs of the genus Telmatobius. This size variation seems to be associated with the duration of the larval stage and may affect the hind-limb morphology in Telmatobius. Larval, juvenile, and adult Telmatobius rubigo and T. oxycephalus ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21264
更新日期：2020-12-01 00:00:00
abstract：:Sceloporus aeneus exhibits reproductive bimodality. That is, one taxon (Sceloporus aeneus bicanthalis) is viviparous whereas the other (Sceloporus aeneus aeneus) is oviparous. Morphological differences in luteal and oviductal structure were examined. Oviparous and viviparous females have distinct corpora lutea that fo...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051840109
更新日期：1985-04-01 00:00:00
