scholarly journals Turning performance of brief squid Lolliguncula brevis during attacks on shrimp and fish

2017 ◽  
pp. jeb.144261 ◽  
Author(s):  
Rachel Jastrebsky ◽  
Ian Bartol ◽  
Paul Krueger
Keyword(s):  
Lolliguncula Brevis

scholarly journals Prey consumed by Guiana dolphin Sotalia guianensis (Cetacea, Delphinidae) and franciscana dolphin Pontoporia blainvillei (Cetacea, Pontoporiidae) in an estuarine environment in southern Brazil

2012 ◽  
Vol 102 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Marta J. Cremer ◽  
Pedro C. Pinheiro ◽  
Paulo C. Simões-Lopes
Keyword(s):  
Prey Species ◽  
Stomach Contents ◽  
Frequency Of Occurrence ◽  
Teleost Fishes ◽  
Southern Brazil ◽  
Sympatric Populations ◽  
Sotalia Guianensis ◽  
Important Prey ◽  
Pontoporia Blainvillei ◽  
Lolliguncula Brevis

The present study provides information about the diet of sympatric populations of small cetaceans in the Babitonga Bay estuary. This is the first study on the diet of these species in direct sympatry. The stomach contents of seven Guiana dolphins Sotalia guianensis and eight franciscanas Pontoporia blainvillei were analyzed. The prey of both cetaceans was mostly teleost fishes, followed by cephalopods. We identified 13 teleost fishes as part of the diet of the franciscanas, and 20 as part of the diet of Guiana dolphins. Lolliguncula brevis was the only cephalopod recorded, and was the most important prey for both cetaceans. Stellifer rastrifer and Gobionellus oceanicus were also important for franciscana, so as Mugil curema and Micropogonias furnieri were important for Guiana dolphins. Stellifer rastrifer and Cetengraulis edentulus were the fishes with the highest frequency of occurrence for franciscana (50%), while Achirus lineatus, C. edentulus, S. brasiliensis, Cynoscion leiarchus, M. furnieri, M. curema, Diapterus rhombeus, Eugerres brasilianus and G. oceanicus showed 28.6% of frequency of occurrence for Guiana dolphins. Franciscanas captured greater cephalopods than the Guiana dolphins in both total length (z= -3.38; n= 40; p< 0.05) and biomass (z = -2.46; n = 40; p<0.05). All of the prey species identified occur inside the estuary, which represents a safe habitat against predators and food availability, reinforcing the importance of the Babitonga Bay for these cetacean populations.

scholarly journals Immunohistochemical evidence for the Na + /Ca 2+ exchanger in squid olfactory neurons

2000 ◽  
Vol 355 (1401) ◽  
pp. 1215-1218 ◽  
Author(s):  
Mary T. Lucero ◽  
Wei Huang ◽  
Tu Dang
Keyword(s):  
Polyclonal Antiserum ◽  
Specific Staining ◽  
Olfactory Neurons ◽  
Pseudostratified Epithelium ◽  
Electrophysiological Studies ◽  
Immunohistochemical Evidence ◽  
Olfactory Organs ◽  
Rapid Activation ◽  
Lolliguncula Brevis

The olfactory organs from the squid Lolliguncula brevis are composed of a pseudostratified epithelium containing five morphological subtypes of chemosensory neurons and ciliated support cells. Physiological recordings have been made from two of the subtypes and only the type 4 neuron has been studied in detail. Odour–stimulated increases in intracellular calcium and rapid activation of an electrogenic Na + /Ca 2+ exchanger current in type 4 neurons suggest that the exchanger proteins are localized very close to the transduction machinery. Electrophysiological studies have shown that olfactory signal transduction takes place in the apical ciliary regions of olfactory neurons. Using polyclonal antiserum against squid Na + /Ca 2+ proteins, we observed specific staining in the ciliary region of cells that resemble type 2, 3, 4 and 5 neurons. Staining was also observed in axon bundles, and in muscle tissue. Collectively, these data support the model that Na + /Ca 2+ exchanger proteins are localized to transduction machinery in cilia of type 4 neurons and suggest that the other olfactory subtypes also use Ca 2+ during chemosensory responses.

Experimental study on the effect of diet on fatty acid and stable isotope profiles of the squid Lolliguncula brevis

2006 ◽  
Vol 333 (1) ◽  
pp. 97-114 ◽  
Author(s):  
Gabriele Stowasser ◽  
Graham J. Pierce ◽  
Colin F. Moffat ◽  
Martin A. Collins ◽  
John W. Forsythe
Keyword(s):  
Experimental Study ◽  
Fatty Acid ◽  
Stable Isotope ◽  
Lolliguncula Brevis

scholarly journals Comparative morphology among representatives of main taxa of Scaphopoda and basal protobranch Bivalvia (Mollusca)

2009 ◽  
Vol 49 (32) ◽  
pp. 405-457 ◽  
Author(s):  
Luiz Ricardo L. Simone
Keyword(s):  
Phylogenetic Analysis ◽  
Comparative Morphology ◽  
Brazilian Coast ◽  
Main Concern ◽  
Nautilus Pompilius ◽  
The Family ◽  
Fernando De Noronha ◽  
Lolliguncula Brevis ◽  
South Brazil

This study deals with detailed morphology and anatomy of 4 species of Scaphopoda and 5 species of protobranch Bivalvia. Both classes are traditionally grouped in the taxon Diasoma, which has been questioned by different methodologies, such as molecular and developmental. This study is developed under a phylogenetic methodology with the main concern in performing it in an intelligible and testable methodology. The analyzed Scaphopoda species came from the Brazilian coast and belong to the family Dentaliidae [(1) Coccodentalium carduus; (2) Paradentalium disparile] and Gadiliidae; [(3) Polyschides noronhensis, n. sp. from Fernando de Noronha Archipelago; (4) Gadila braziliensis]. These species represent the main branches of the class Scaphopoda. From protobranch bivalves, representatives of the families Solemyidae [(5) Solemya occidentalis, from Florida; S. notialis, n. sp. from S.E. Brazil], Nuculanidae [(6) Propeleda carpentieri from Florida], and Nuculidae [(7) Ennucula puelcha, from south Brazil] are included. These species represent the main branches of the basal Bivalvia. The descriptions on the anatomy of S. occidentalis and of P. carpentieri are published elsewhere. The remaining are included here, for which a complete taxonomical treatment is performed. Beyond these species, representatives of other taxa are operationally included as part of the ingroup (indices are then shared with them), as a procedure to test the morphological monophyly of Diasoma. These taxa are: two lamellibranch bivalves [(8) Barbatia - Arcidae; (9) Serratina - Tellinidae; both published elsewhere;, and Propilidium (10) Patellogastropoda, and (11) Nautilus, basal Cephalopoda, based on basal taxa. The effective outgroups are (12) Neopilina (Monoplacophora) and (13) Hanleya (Polyplacophora). The phylogenetic analysis based on morphology revealed that the taxon Diasoma is supported by 14 synapomorphies, and is separated from Cyrtosoma (Gastropoda + Cephalopoda). Although they are not the main goal of this paper, the taxa Scaphopoda and Bivalvia are supported by 8 and by 7 synapomorphies respectively. The taxon Protobranchia resulted paraphyletic. Both scaphopod orders resulted monophyletic. The obtained cladogram is: ((((Coccodentalium carduus - Paradentalium disparile) (Polyschides noronhensis - Gadila brasiliensis)) ((Solemya occidentalis - S. notialis) (Propeleda carpenteri (Ennucula puelcha (Barbatia cancellaria - Serratina capsoides))))) (Propilidium curumim - Nautilus pompilius - Lolliguncula brevis)).

scholarly journals Draft Genome Sequence of a Harveyi Clade Bacterium Isolated from Lolliguncula brevis Squid

2020 ◽  
Vol 9 (8) ◽  
Author(s):  
Alecia N. Septer ◽  
Lauren Speare ◽  
Collin K. Coleman ◽  
Stephanie Smith ◽  
Coby Dorsey ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Free Living ◽  
Content Type ◽  
Marine Habitats ◽  
Lolliguncula Brevis

Vibrio species of the Harveyi clade are commonly found in free-living and host-associated marine habitats. Here, we report the draft genome sequence for a Harveyi clade bacterium, Vibrio sp. strain LB10LO1, which was isolated from the Atlantic brief squid Lolliguncula brevis.

scholarly journals Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil

2019 ◽  
Vol 59 ◽  
pp. e20195933
Author(s):  
Luana Marina De Castro Mendonça ◽  
Carmen Regina Parisotto Guimarães ◽  
Silvio Felipe Barbosa Lima
Keyword(s):  
Northeastern Brazil ◽  
Sampling Effort ◽  
Frequency Of Occurrence ◽  
Trawl Fishery ◽  
Shrimp Trawl ◽  
Xiphopenaeus Kroyeri ◽  
Negative Impacts ◽  
Richness Estimators ◽  
Lolliguncula Brevis ◽  
Trawl Fisheries

The malacofauna bycatch of sea-bob shrimp Xiphopenaeus kroyeri (Heller, 1862) trawl fisheries on the coast of Sergipe was studied for 5 years. The malacofauna bycatch considered was obtained in nine oceanographic sampling campaigns carried out between May 1999 and June 2003 in 18 stations distributed in six transects along depths of 10, 20 and 30 m. A total of 2,669 individuals of mollusk belonging to 54 species were captured on the 18 sea-bob shrimp trawl stations carried out along the coast of Sergipe. The considerable richness of mollusks was composed by 19 families and 31 species of gastropods, 12 families and 19 species of bivalves and 2 families and 4 species of cephalopods. The highest abundance were observed at stations 13 (373 individuals) and 16 (685 individuals) that represents the lowest depth (10 m) and the richness was higher at stations 15 and 12 (17 and 11 species, respectively) both located at the highest depth (30 m). Cephalopods had high frequency of occurrence being collected in all the stations and by far the most abundant group with a total of 2,488 individuals captured. On the other hand, gastropods (with 142 individuals found in 83.3% of stations) and bivalves (about 1% of the individuals collected) contribute with a much smaller percentage of individuals captured. Lolliguncula brevis (Blainville, 1823) was most representative cephalopod in number and frequency of occurrence. Arcidae, Conidae, Muricidae and Strombidae were the families with the higher number of species in the trawl-fishery. Among bivalves, Pitar arestus (Dall & Simpson, 1901) and Spathochlamys benedicti (Verrill & Bush [in Verrill], 1897) were the species with higher frequency of occurrence. Although the considerable sample effort and a number of mollusks captured as bycath, the richness estimators indicated that the species richness could increase with additional sampling effort in the study area. The present study expands the taxonomic alpha knowledge on the mollusk bycatch of sea-bob shrimp trawl fisheries on the northeastern coast of Brazil. However, it is of crucial importance to assess urgently the negative impacts of the sea-bob shrimp trawl fisheries on the benthic community of the entire coast of Brazil.

Respiratory and Cardiac Performance in Lolliguncula Brevis (Cephalopoda, Myopsida): The Effects of Activity, Temperature and Hypoxia

1988 ◽  
Vol 138 (1) ◽  
pp. 17-36 ◽  
Author(s):  
M.J. WELLS ◽  
R. T. HANLON ◽  
P. G. LEE ◽  
F. P. DIMARCO
Keyword(s):  
Cardiac Output ◽  
Oxygen Uptake ◽  
Stroke Volume ◽  
Acute Hypoxia ◽  
Ventilation Rate ◽  
Necessary Condition ◽  
Jet Propulsion ◽  
Q10 Values ◽  
Oxygen Carrying Capacity ◽  
Lolliguncula Brevis

Lolliguncula brevis Blainville is a small euryhaline squid found at temperatures between 11 and 31 °C. Changes in VO2, heartbeat and ventilation frequencies were observed throughout this temperature range and under a variety of conditions, including acute hypoxia and swimming by jet propulsion in a tunnel respirometer. Resting VO2 showed a Q10 of 1.47, and heart rate and ventilation rate Q10 values of 1.92 and 1.73, respectively; oxygen uptake could exceed 1.01kg−1h−1 at 30°C even at rest. The squids regulated their oxygen uptake at all temperatures. Oxygen extraction rates were in the region of 5–10% in saturated water, increasing to 15–20% in hypoxic water or after exercise. One effect of this variability is that ventilation stroke volume can remain constant throughout the range of temperatures and oxygen concentrations that the animal is likely to encounter, a necessary condition since the ventilation stream is also the principal mode of locomotion by jet propulsion. Blood oxygen-carrying capacity (from the copper concentration) was 4.6 ± 1.8vols%. Cardiac output and stroke volume were estimated from the observed VO2 values and heartbeat frequencies. Resting at 25°C, the output was close to 11.51kg−1 body mass h−1. The systemic heart of Lolliguncula weighed only 2.06 ± 0.62 g kg−1. In exercise the cardiac output must exceed 14×103 1kg−1 heart mass h−1, pumping more than the heart's own mass of blood at each stroke.

Proprioceptive hair cells on the neck of the squid Lolliguncula brevis :a sense organ in cephalopods for the control of head-to-body position

1995 ◽  
Vol 349 (1328) ◽  
pp. 153-178 ◽  
Keyword(s):  
Hair Cells ◽  
Position Control ◽  
Body Position ◽  
Sense Organ ◽  
The Body ◽  
Sensory Cells ◽  
Posterior Group ◽  
Left And Right ◽  
Head Roll ◽  
Lolliguncula Brevis

Decapod cephalopods, such as cuttlefishes and squids, have a distinct neck region that allows movements (roll, pitch and yaw) of the head relative to the body. This paper describes the structure, innervation and central pathways of proprioceptive hair cells on the neck of the squid Lolliguncula brevis that sense such movements and control head-to-body position. These hair cells exist on the dorsal side of the neck underneath the nuchal cartilage, close to the animal’s midline on either side of the nuchal crest. On each side, the hair cells can be divided into an anterior and a posterior group of 25—35 and 70—80 cells, respectively. An individual hair cell carries up to 300 kinocilia of equal length (about 30 pm), arranged in up to seven rows. The hair cells of the left and right anterior group are morphologically polarized in the medial direction, whereas the hair cells of the left and right posterior group are polarized in the anterior direction. The hair cells are primary sensory cells. They are innervated by a branch of the postorbital nerve and project ipsilaterally into the ventral part of the ventral magnocellular lobe. Efferent synaptic contacts are present at the base of the hair cells. In behavioural tests the influence of the neck hair cells on head position control was investigated. During imposed body rolls, a unilateral deafferentation of the cells caused an asymmetric change of the compensatory head roll response and elicited a head roll offset to the operated side. Bilateral deafferentation of the cells elicited a downward head pitch offset. This offset was superimposed on the compensatory head pitch response during imposed body pitch. These morphological and behavioural findings show that the neck hair cells and the associated nuchal cartilage structures of Lolliguncula brevis form a neck receptor organ that, together with statocyst an visua inputs, controls the position of the animal’s head and body.

Characterization of a Na+-Dependent Betaine Transporter With Cl− Channel Properties in Squid Motor Neurons

1999 ◽  
Vol 81 (4) ◽  
pp. 1567-1574 ◽  
Author(s):  
Christopher N. Petty ◽  
Mary T. Lucero
Keyword(s):  
Motor Neurons ◽  
Marine Invertebrates ◽  
Organic Osmolytes ◽  
Giant Fiber ◽  
Response Data ◽  
Elevated Salinity ◽  
Lolliguncula Brevis ◽  
Channel Properties ◽  
Relevant Range

Characterization of a Na+-dependent betaine transporter with Cl− channel properties in squid motor neurons. Most marine invertebrates, including squids, use transporters to accumulate organic osmolytes such as betaine, to prevent water loss when exposed to elevated salinity. Although a limited number of flux studies have shown the Na+ dependence of betaine transport, nothing is known about the electrogenic properties of osmolyte transporters. We used whole cell and perforated-patch voltage-clamp techniques to characterize the electrical properties of the betaine transporter in giant fiber lobe motor neurons of the squid Lolliguncula brevis. Betaine activated a large, Cl−-selective current that was reversibly blocked by 100 μM niflumic acid (97 ± 2% block after 40 s, SD; n = 7) and partially inhibited by 500 μM SITS (29 ± 11%; n = 5). The Cl− current was Na+ dependent and was virtually eliminated by isotonic replacement of Na+ with Li+, NMDG+, or Tris+. Concentration-response data revealed an EC50 in a physiologically relevant range for these animals of 5.1 ± 0.9 mM ( n = 11). In vertebrates, the betaine transporter is structurally related to the GABA transporter, and although GABA did not directly activate the betaine-induced current, it reversibly reduced betaine responses by 34 ± 14% ( n = 8). Short-term changes in osmolality alone did not activate the Cl− current, but when combined with betaine, Cl− currents increased in hypertonic solutions and decreased in hypotonic solutions. Activation of the betaine transporter and Cl− current in hypertonic conditions may affect both volume regulation and excitability in L. brevis motor neurons. This study is the first report of a novel betaine transporter in neurons that can act as a Cl− channel.

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