Northern extension of Lesueurigobius friesii (Malm, 1874) (Pisces: Gobiidae) distribution and the gobiid diversity decline along the Norwegian coast

Lesueurigobius friesii was collected in Eidsfjorden, Sognefjorden, Norway, extending its known distribution range north as the new northernmost locality of this species. Globally, the northernmost presence of gobies is along the coast of Norway. Their diversity along the Norwegian coast showed an evident latitude gradient of gobiid diversity with a clear decrease from south to north. The significant regression structural change was found at the 63/64° N latitude band followed by a 36.4% decrease in gobiid species diversity. The species traits of gobiids north of the regression breaking point and those restricted to the south of it were compared. The only significantly more frequent characteristic of species passing north of the regression breaking point is the large depth range that reach down to the shelf break. All species present north of the point, except Thorogobius ephippiatus (that barely passes it) belong to Oxudercinae (i.e. to Pomatoschistuslineage of that subfamily).

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High-resolution optical coherence tomography over a large depth range with an axicon lens

Optics Letters ◽

10.1364/ol.27.000243 ◽

2002 ◽

Vol 27 (4) ◽

pp. 243 ◽

Cited By ~ 238

Author(s):

Zhihua Ding ◽

Hongwu Ren ◽

Yonghua Zhao ◽

J. Stuart Nelson ◽

Zhongping Chen

Keyword(s):

Optical Coherence Tomography ◽

High Resolution ◽

Depth Range ◽

Optical Coherence ◽

Large Depth

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Metacommunities

Community Ecology ◽

10.1093/oso/9780198835851.003.0014 ◽

2019 ◽

pp. 266-284

Author(s):

Gary G. Mittelbach ◽

Brian J. McGill

Keyword(s):

Species Diversity ◽

Species Interactions ◽

Neutral Theory ◽

Patch Dynamics ◽

Species Traits ◽

Local Communities ◽

The Other ◽

Species Sorting ◽

Niche Differences ◽

Dynamics Of Populations

Just as the dispersal of individuals may link the dynamics of populations in space, the dispersal of species among communities may link local communities into a metacommunity. Four different perspectives characterize how dispersal rates, environmental heterogeneity, and species traits interact to influence diversity in metacommunities. These perspectives are: patch dynamics, species sorting, mass effects, and the neutral perspective. The neutral perspective stands in stark contrast to the other three perspectives in that it assumes that niche differences between species are unimportant and that species are demographically identical in terms of their birth, death, and dispersal rates. Under the neutral perspective, species diversity is maintained by a balance between speciation, extinction, and dispersal. Although neutral theory is incompatible with realistic modes and rates of speciation, it has been enormously influential in focusing our attention on the linkages between species interactions on local scales, and evolutionary and biogeographic processes occurring on large scales.

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Guided, Fusion-Based, Large Depth-of-field 3D Imaging Using a Focal Stack

Sensors ◽

10.3390/s19224845 ◽

2019 ◽

Vol 19 (22) ◽

pp. 4845 ◽

Cited By ~ 5

Author(s):

Yuhao Xiao ◽

Guijin Wang ◽

Xiaowei Hu ◽

Chenbo Shi ◽

Long Meng ◽

...

Keyword(s):

3D Imaging ◽

Depth Map ◽

Shape Measurement ◽

Depth Range ◽

High Quality ◽

Large Depth ◽

3D Shape ◽

3D Shape Measurement ◽

Working Volume ◽

Focal Stack

Three dimensional (3D) imaging technology has been widely used for many applications, such as human–computer interactions, making industrial measurements, and dealing with cultural relics. However, existing active methods often require both large apertures of projector and camera to maximize light throughput, resulting in a shallow working volume in which projector and camera are simultaneously in focus. In this paper, we propose a novel method to extend the working range of the structured light 3D imaging system based on the focal stack. Specifically in the case of large depth variation scenes, we first adopted the gray code method for local, 3D shape measurement with multiple focal distance settings. Then we extracted the texture map of each focus position into a focal stack to generate a global coarse depth map. Under the guidance of the global coarse depth map, the high-quality 3D shape measurement of the overall scene was obtained by local, 3D shape-measurement fusion. To validate the method, we developed a prototype system that can perform high-quality measurements in the depth range of 400 mm with a measurement error of 0.08%.

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High resolution axicon-based endoscopic FD OCT imaging with a large depth range

10.1117/12.842504 ◽

2010 ◽

Author(s):

Kye-Sung Lee ◽

William Hurley ◽

John Deegan ◽

Scott Dean ◽

Jannick P. Rolland

Keyword(s):

High Resolution ◽

Depth Range ◽

Large Depth ◽

Oct Imaging

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Vertical and Horizontal Distribution Patterns of Copepods Near the Shelf Break South of Nova Scotia

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f81-147 ◽

1981 ◽

Vol 38 (9) ◽

pp. 1065-1076 ◽

Cited By ~ 47

Author(s):

Alex W. Herman ◽

Douglas D. Sameoto ◽

Alan R. Longhurst

Keyword(s):

Nova Scotia ◽

Chlorophyll A ◽

Depth Resolution ◽

Food Concentration ◽

Horizontal Distribution ◽

Shelf Break ◽

Plant Production ◽

Depth Range ◽

Shelf Water ◽

Shelf Slope

The shelf water over the outer edge of the Scotian Shelf and the shelf/slope water front at the shelf break south of Nova Scotia have been sampled with a Batfish cycling over a 3- to 110-m-depth range while measuring salinity, temperature, depth, chlorophyll a, and copepods. Plant production and copepod abundance were much higher at the front than in surrounding shelf and slope waters. Convergence at the front is invoked as a possible transport mechanism which results in the accumulation of copepods in a region of high food concentration. Copepods exhibit diel vertical migration in shelf water but not in the front itself, and possible mechanisms are examined. Most Batfish profiles (with ≈1-m-depth resolution) indicated that the copepod maximum was situated ≈10 m above the chlorophyll maximum. A series of vertical profiles consisting of chlorophyll a, estimated production, and copepod abundances indicate a high correlation between the copepod and production profiles and low correlation between either of these and chlorophyll. Possible relationships between copepod layer depths and the depths of high plant production are considered.Key words: copepods, batfish, chlorophyll, production, front, migration

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High-frequency color-encoded fringe-projection profilometry based on geometry constraint for large depth range

Optics Express ◽

10.1364/oe.388579 ◽

2020 ◽

Vol 28 (9) ◽

pp. 13043

Author(s):

Yingying Wan ◽

Yiping Cao ◽

Xinran Liu ◽

Tianyang Tao ◽

Jonathan Kofman

Keyword(s):

High Frequency ◽

Fringe Projection ◽

Depth Range ◽

Large Depth ◽

Fringe Projection Profilometry

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Species traits and species diversity affect community stability in a multiple stressor framework

Aquatic Biology ◽

10.3354/ab00479 ◽

2012 ◽

Vol 17 (3) ◽

pp. 197-209 ◽

Cited By ~ 24

Author(s):

S Flöder ◽

H Hillebrand

Keyword(s):

Species Diversity ◽

Species Traits ◽

Community Stability ◽

Multiple Stressor

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Study on Paleoecology of Late Pennsylvanian Phylloid Algae in South Guizhou, China

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.183-185.180 ◽

2011 ◽

Vol 183-185 ◽

pp. 180-183

Author(s):

Li Li Yang ◽

En Pu Gong

Keyword(s):

Chemical Defense ◽

Depth Range ◽

Dense Networks ◽

Large Depth ◽

Rate Of Growth ◽

Algae Growth ◽

Phylloid Algae ◽

Improve Rate

Pennsylvanian phylloid algal reefs are widespread and well exposed in south Guizhou, China. Dense networks of closely living phylloid algae induced community restriction on seafloor and organisms seldom survived in such environment. Algal reefs in Guizhou differ from examples reported to date by high biodiversity. This contrasts to the “poisoning hypothesis” and chemical defense was not pronounced. Phylloid algae were able to thrive over a large depth range. Delicate framework formed by upright blades often occurred in calm deepen waters. Blades became larger and fleshy in moderately agitated environment and formed isolated, wide, cup-shaped framework. Large blade size could capture much more sunlight to improve rate of growth and calcification. But successive progressively shallower water may have arrested phylloid algae growth. Thinner, small blades grew closely packed and juxtaposed near and above one another in a wave-dominant environment, producing dense framework clusters to prevent wave destruction.

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