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Biological Bulletin

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https://www.readbyqxmd.com/read/28445096/protection-from-oxidative-stress-in-immunocytes-of-the-colonial-ascidian-botryllus-schlosseri-transcript-characterization-and-expression-studies
#1
Nicola Franchi, Francesca Ballin, Loriano Ballarin
Botryllus schlosseri is a cosmopolitan colonial ascidian that undergoes cyclical generation changes, or take-overs, during which adult zooids are resorbed and replaced by their buds. At take-over, adult tissues undergo diffuse apoptosis and effete cells are massively ingested by circulating phagocytes, with a consequent increase in oxygen consumption and in production of reactive oxygen species (ROS). The latter are responsible for the death of phagocytes involved in the clearance of apoptotic cells and corpses by phagocytosis-induced apoptosis...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445095/physiological-versus-biological-control-in-bivalve-calcite-prisms-comparison-of-euheterodonts-and-pteriomorphs
#2
Elizabeth M Harper, Antonio Checa
Multiple groups of bivalve molluscs produce calcitic shell layers, many of these broadly classified as "prismatic." Various pteriomorphian bivalves (such as oysters, pterioids, and mussels) secrete prismatic microstructures with high organic content and clear, strong biological control. However, we present the results of a detailed analysis by scanning electron microscopy (SEM), thermogravimetric analysis, and electron backscatter diffraction to characterize the calcitic prisms in two different clades within the euheterodont bivalves: the extant Chama arcana and the extinct rudists...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445094/proteinases-during-early-development-of-the-pacific-whiteleg-shrimp-penaeus-vannamei
#3
Patricia Hernandez-Cortes, Crisalejandra Rivera-Pérez, Fernando García-Carreño, Diana Martínez-Alarcón
During shrimp larval development, changes occur in molecular components. Enzyme activity and mRNA expression of proteinases were assayed in Penaeus vannamei during larval development, which consists of 5 nauplius stages, 3 protozoeal stages, 3 mysis stages, and 12 postlarval stages. Trypsin activity reached a maximum at the beginning of postlarval stages 1 and 2, and significantly decreased in subsequent postlarval stages. Chymotrypsin activity increased at the third protozoeal stage, then significantly decreased in subsequent stages...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445093/dynamics-of-cytokine-like-activity-in-the-hyperplasic-ovary-of-ex-fissiparous-planarians
#4
Abdel Halim Harrath, Abdelhabib Semlali, Lamjed Mansour, Waleed Aldahmash, Suliman Y Al Omar, Mohamed S Al Anazi, Jens R Nyengaard, Saleh Alwasel
The origin of infertility in the hyperplasic ovary of ex-fissiparous planarians remains poorly understood. In a previous study we demonstrated that a complex process of early autophagy, followed by apoptotic processes, occurs in the hyperplasic ovary of the freshwater planarian Dugesia arabica. The present study aimed to investigate whether the mRNA expression levels of selected mRNA-like genes are altered in the hyperplasic ovary of the ex-fissiparous freshwater planarian D. arabica compared to the normal ovary...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445092/frontmatter
#5
(no author information available yet)
No abstract text is available yet for this article.
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445091/comparative-molecular-and-morphological-variation-analysis-of-siderastrea-anthozoa-scleractinia-reveals-the-presence-of-siderastrea-stellata-in-the-gulf-of-mexico
#6
Norberto A Colín García, Jorge E Campos, José L Tello Musi, Zac H Forsman, Jorge L Montero Muñoz, Alejandro Monsalvo Reyes, Jesús E Arias González
The genus Siderastrea exhibits high levels of morphological variability. Some of its species share similar morphological characteristics with congeners, making their identification difficult. Siderastrea stellata has been reported as an intermediary of S. siderea and S. radians in the Brazilian reef ecosystem. In an earlier study conducted in Mexico, we detected Siderastrea colonies with morphological features that were not consistent with some siderastreid species previously reported in the Gulf of Mexico...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445090/embracing-tradition-and-change
#7
Ken Halanych
No abstract text is available yet for this article.
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445089/genetic-and-morphological-differentiation-of-the-semiterrestrial-crab-armases-angustipes-brachyura-sesarmidae-along-the-brazilian-coast
#8
Murilo Zanetti Marochi, Setuko Masunari, Christoph D Schubart
The genetic and morphometric population structures of the semiterrestrial crab Armases angustipes from along the Brazilian coast were examined. The influence of the Central South Equatorial Current on larval dispersal of A. angustipes also was evaluated. Six populations were sampled from estuarine areas in São Luis do Maranhão, Maranhão; Natal, Rio Grande do Norte; Maceió, Alagoas; Ilhéus, Bahia; Aracruz, Espírito Santo; and Guaratuba, Paraná. Patterns of genetic differentiation were assessed using DNA sequence data corresponding to parts of the mitochondrial cytochrome c oxidase subunit 1...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28048962/chemical-ecology-of-wave-swept-shores-the-primacy-of-contact-cues-in-predation-by-whelks
#9
Graham A Ferrier, Cheryl Ann Zimmer, Richard K Zimmer
Wave-swept shores are valuable for developing and testing key ecological principles. A synthesis of research is nonetheless missing a critical component: the chemosensory basis for behavioral interactions that determine population- and community-wide attributes. Chemical signaling environments on wave-swept shores, given their intense, turbulent mixing and complex topographies, would be difficult or impossible to simulate in a laboratory setting. For this reason, appropriately scaled field studies are needed to advance understanding of chemical stimuli and their biotic effects...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048961/resource-availability-drives-mating-role-selection-in-a-simultaneous-hermaphrodite-aplysia-californica
#10
Kyle T David, Phillip Tanabe, Lynne A Fieber
In simultaneous hermaphrodites, a clear conflict exists between sperm donor and sperm recipient roles, and how such conflict is mediated remains up for debate. This study observed and recorded mating role selection as a function of resource availability in the simultaneous hermaphrodite Aplysia californica. When food was plentiful, animals assumed both sperm donor and recipient roles at relatively even frequency. However, when half of the mating pairs were placed on restricted diets, food-limited animals assumed the sperm donor role at significantly (P < 0...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048960/impact-of-environment-and-ontogeny-on-relative-fecundity-and-egg-quality-of-female-oysters-crassostrea-virginica-from-four-sites-in-northern-chesapeake-bay
#11
Hillary Lane Glandon, Adriane K Michaelis, Vincent A Politano, Stephanie T Alexander, Emily A Vlahovich, Kimberly S Reece, Heather N Koopman, Donald W Meritt, Kennedy T Paynter
Resource allocation to reproduction is a primary physiological concern for individuals, and can vary with age, environment, or a combination of both factors. In this study we quantified the impact of environment and individual age on the reproductive output of female oysters Crassostrea virginica. We determined the relative fecundity, egg total lipid content, and overall and omega-3/omega-6 (ω3/ω6) fatty acid signatures (FAS) of eggs spawned by female oysters over a 2-year period (n = 32 and n = 64). Variation was quantified spatially and ontogenetically by sampling young and old oyster populations from two rivers in Chesapeake Bay, totaling four collection sites...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048959/expression-and-localization-of-carbonic-anhydrase-genes-in-the-serpulid-polychaete-hydroides-elegans
#12
Grant Batzel, Brian T Nedved, Michael G Hadfield
The metalloenzyme, carbonic anhydrase (CA), catalyzes the reversible hydration of carbon dioxide into bicarbonate, and is responsible for biomineralization processes in animals. In the Annelida, the marine worms in the family Serpulidae are typified by the construction of calcium carbonate tubes. Hydroides elegans, a common member of warmwater biofouling communities around the world, provides an outstanding model for studies of calcification. To better understand the molecular process of biomineralization in H...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048958/new-editor-in-chief-of-the-biological-bulletin
#13
Louis E Burnett
No abstract text is available yet for this article.
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048957/the-way-forward
#14
J L Olds
No abstract text is available yet for this article.
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048956/frontmatter
#15
(no author information available yet)
No abstract text is available yet for this article.
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048954/a-preliminary-molecular-and-phylogenetic-analysis-of-the-genome-of-a-novel-endogenous-retrovirus-in-the-sea-slug-elysia-chlorotica
#16
Sidney K Pierce, Padmanabhan Mahadevan, Steven E Massey, Michael L Middlebrooks
An endogenous retrovirus that is present in the sea slug Elysia chlorotica is expressed in all individuals at the end of the annual life cycle. But the precise role of the virus, if any, in slug senescence or death is unknown. We have determined the genomic sequence of the virus and performed a phylogenetic analysis of the data. The 6060-base pair genome of the virus possesses a reverse transcriptase-domain-containing protein that shows similarity to retrotransposon sequences found in Aplysia californica and Strongylocentrotus purpuratus...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048953/a-multifunction-muscle-in-squid
#17
Joseph T Thompson, Scott M Lavalva, Matthew M Loiacono
Some striated muscles are multifunctional; they serve several different roles during locomotion and movement, including acting as motors, brakes, struts, or springs. The few multifunctional muscles that have been reported occur in the cross-striated muscles of animals with complex, jointed, skeletal support systems. In the comparatively simple muscular system of a cephalopod mollusc, we identified an obliquely striated muscle, the nuchal retractor muscle, which appears to be multifunctional. The nuchal retractor is composed of two different fiber types, mitochondria-rich (MR) and mitochondria-poor (MP) fibers; shortening of these fibers retracts the head toward the mantle...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28048952/adherens-junctions-modulate-diffusion-between-epithelial-cells-in-trichoplax-adhaerens
#18
Carolyn L Smith, Thomas S Reese
Trichoplax adhaerens is the sole named member of Placozoa, an ancient metazoan phylum. This coin-shaped animal glides on ventral cilia to find and digest algae on the substrate. It has only six cell types, all but two of which are incorporated into the epithelium that encloses it. The upper epithelium is thin, composed of a pavement of relatively large polygonal disks, each bearing a cilium. The lower epithelium is thick and composed primarily of narrow ciliated cells that power locomotion. Interspersed among these cells are two different secretory cells: one containing large lipophilic granules that, when released, lyse algae under the animal; the other, less abundant, is replete with smaller secretory granules containing neuropeptides...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/27820909/novel-structures-associated-with-presumed-photoreceptors-in-the-aboral-sense-organ-of-ctenophores
#19
Sidney L Tamm
No abstract text is available yet for this article.
October 2016: Biological Bulletin
https://www.readbyqxmd.com/read/27820908/frontmatter
#20
(no author information available yet)
No abstract text is available yet for this article.
October 2016: Biological Bulletin
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