scholarly journals Bone-eating worms from the Antarctic: the contrasting fate of whale and wood remains on the Southern Ocean seafloor

2013 ◽  
Vol 280 (1768) ◽  
pp. 20131390 ◽  
Author(s):  
Adrian G. Glover ◽  
Helena Wiklund ◽  
Sergio Taboada ◽  
Conxita Avila ◽  
Javier Cristobo ◽  
...  
Keyword(s):  
New Species ◽  
Antarctic Circumpolar Current ◽  
Phylogenetic Analyses ◽  
Two New Species ◽  
Deep Water Species ◽  
Fall Experiment ◽  
Circumpolar Current ◽  
Species Descriptions ◽  
The Antarctic ◽  
Water Species

We report the results from the first experimental study of the fate of whale and wood remains on the Antarctic seafloor. Using a baited free-vehicle lander design, we show that whale-falls in the Antarctic are heavily infested by at least two new species of bone-eating worm, Osedax antarcticus sp. nov. and Osedax deceptionensis sp. nov. In stark contrast, wood remains are remarkably well preserved with the absence of typical wood-eating fauna such as the xylophagainid bivalves. The combined whale-fall and wood-fall experiment provides support to the hypothesis that the Antarctic circumpolar current is a barrier to the larvae of deep-water species that are broadly distributed in other ocean basins. Since humans first started exploring the Antarctic, wood has been deposited on the seafloor in the form of shipwrecks and waste; our data suggest that this anthropogenic wood may be exceptionally well preserved. Alongside the new species descriptions, we conducted a comprehensive phylogenetic analyses of Osedax , suggesting the clade is most closely related to the frenulate tubeworms, not the vestimentiferans as previous reported.

Two new brackish-water species of Macrostomum (Platyhelminthes, Macrostomida) from mangrove wetland in southern China

Zootaxa ◽  
2017 ◽  
Vol 4276 (1) ◽  
pp. 107
Author(s):  
LEI WANG ◽  
FAN XIN ◽  
CHU-YU FANG ◽  
YU ZHANG ◽  
AN-TAI WANG
Keyword(s):  
New Species ◽  
Brackish Water ◽  
Southern China ◽  
Phylogenetic Analyses ◽  
Wall Thickening ◽  
Artificial Lake ◽  
Mangrove Wetland ◽  
Two New Species ◽  
Brackish Water Species ◽  
Water Species

In this paper, two new brackish-water species of Macrostomum (M. shenzhenensis n. sp. and M qiaochengensis n. sp.) collected from the artificial lake in Overseas Chinese Town mangrove wetland, are described based on the morphology of the penis stylet and on a molecular phylogenetic analysis. M. shenzhenensis n. sp. has an elongate, narrow stylet with torus-shaped distal wall thickening, while M. qiaochengensis n. sp. has a hook-like stylet with a pointed end. Both the 18S and 28S rDNA phylogenetic analyses of M shenzhenensis n. sp. and M qiaochengensis n. sp. support the establishments of these two new species. Finally, categorization of these two new species based on the morphology of sperm and penis stylet, as well as other morphological features of the reproductive system is briefly discussed. 

scholarly journals Nonlinear Differential Equations Modeling the Antarctic Circumpolar Current

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Jifeng Chu ◽  
Kateryna Marynets
Keyword(s):  
Fixed Point ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Topological Degree ◽  
Antarctic Circumpolar Current ◽  
Fixed Point Theorems ◽  
Nonlinear Differential Equations ◽  
Existence Results ◽  
Circumpolar Current ◽  
The Antarctic

AbstractThe aim of this paper is to study one class of nonlinear differential equations, which model the Antarctic circumpolar current. We prove the existence results for such equations related to the geophysical relevant boundary conditions. First, based on the weighted eigenvalues and the theory of topological degree, we study the semilinear case. Secondly, the existence results for the sublinear and superlinear cases are proved by fixed point theorems.

Bougainvillia aberrans (Cnidaria, Hydrozoa), a new species of hydroid and medusa from the upper bathyal zone off Bermuda

1993 ◽  
Vol 71 (5) ◽  
pp. 997-1002 ◽  
Author(s):  
Dale R. Calder
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
Deep Water ◽  
North Atlantic Ocean ◽  
Deep Water Species ◽  
A New Species ◽  
Water Species

Bougainvillia aberrans n.sp. is described from Bermuda in the western North Atlantic Ocean. Specimens were collected at a depth of 150 fathoms (274 m) from the polypropylene buoy line of a crab trap. The hydroid colony of B. aberrans is erect, with a polysiphonic hydrocaulus, a smooth to somewhat wrinkled perisarc, hydranths having a maximum of about 16 tentacles, and medusa buds arising only from hydranth pedicels. Medusae liberated in the laboratory from these hydroids differ from all other known species of the genus in having a long, spindle-shaped manubrium, lacking oral tentacles, having marginal tentacles reduced to mere stubs, and being very short-lived (surviving for a few hours at most). Gonads develop in medusa buds while they are still attached to the hydroids, and gametes are shed either prior to liberation of the medusae or shortly thereafter. The eggs are surrounded by an envelope bearing nematocysts (heterotrichous microbasic euryteles). The cnidome of both hydroid and medusa stages consists of desmonemes and heterotrichous microbasic euryteles. The diagnosis of the genus Bougainvillia is modified to accommodate this new deep-water species.

Two new species of Craterellus (Cantharellaceae) from tropical India

Phytotaxa ◽  
2018 ◽  
Vol 346 (2) ◽  
pp. 157
Author(s):  
C. BIJEESH ◽  
A. MANOJ KUMAR ◽  
K.B. VRINDA ◽  
C.K. PRADEEP
Keyword(s):  
New Species ◽  
Tropical Forests ◽  
Phylogenetic Analyses ◽  
Gene Region ◽  
Similar Species ◽  
Rdna Gene ◽  
Two New Species ◽  
Kerala State

Two unusual species of Craterellus have been collected numerous times from the evergreen tropical forests in Kerala State, India. The species Craterellus albostrigosus and Craterellus inusitatus are described as new based on morphological and phylogenetic analyses of nrLSU-rDNA gene region. Complete morphological descriptions, photographs and comparisons with similar species are provided as well as a key to the known species of Craterellus from India.

scholarly journals Distinct Oceanic Microbiomes From Viruses to Protists Located Near the Antarctic Circumpolar Current

2018 ◽  
Vol 9 ◽  
Author(s):  
Flavia Flaviani ◽  
Declan C. Schroeder ◽  
Karen Lebret ◽  
Cecilia Balestreri ◽  
Andrea C. Highfield ◽  
...  
Keyword(s):  
Antarctic Circumpolar Current ◽  
Circumpolar Current ◽  
The Antarctic

scholarly journals The Antarctic Circumpolar Current as a diversification trigger for deep-sea octocorals

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Luisa F. Dueñas ◽  
Dianne M. Tracey ◽  
Andrew J. Crawford ◽  
Thomas Wilke ◽  
Phil Alderslade ◽  
...  
Keyword(s):  
Deep Sea ◽  
Antarctic Circumpolar Current ◽  
Circumpolar Current ◽  
The Antarctic
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