System wide channel network analysis reveals hotspots of morphological change in anthropogenically modified regions of the Ganges Delta

Colony-wide feeding currents are a common feature of many bryozoan colonies. These feeding currents are centered on excurrent macular chimneys that expel previously filtered water away from the colony surface. In some bryozoans these macular chimneys consist of a branching channel network that converges at a point in the center of the chimney. The bifurcating channels of the maculae are analogous to a stream channel network in a closed basin with centripetal drainage. The classical methods of stream channel network analysis from geomorphology are here used to quantitatively analyze the number and length of macular channels in bryozoans. This approach is applied to a giant branch of the trepostome bryozoan Tabulipora from the Early Permian Kim Fjelde Formation in North Greenland. Its large size allowed 18 serial tangential peels to be made through the 8-mm-thick exozone. The peels intersected two stellate maculae as defined by contiguous exilapores. The lengths of 1460 channels radiating from the maculae were measured and their Horton-Strahler stream order and Shreve magnitude scored.We hypothesize that if fossil bryozoan maculae function as excurrent water chimneys, then they should conform to Horton's laws of stream networks and behave like closed basins with centripetal drainage. Results indicate that the stellate maculae in this bryozoan behaved liked stream channel networks exhibiting landscape maturation and stream capture. They conformed to the Law of Stream Number. They have a Bifurcation Ratio that falls within the range of natural stream channel networks. They showed a pattern opposite that expected by the Law of Stream Lengths in response to behavior characteristic of a centripetal drainage pattern in a closed basin. Thus, the stellate maculae in this bryozoan probably functioned as excurrent water chimneys with the radiating channels serving to efficiently collect the previously filtered water, conducting it to the central chimney for expulsion away from the colony surface.

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A Southeast Asian species in the Ganges Delta: on spreading extent of non-native croaking gourami Trichopsis vittata (Cuvier, 1831) in Bangladesh

BioInvasions Records ◽

10.3391/bir.2018.7.4.16 ◽

2018 ◽

Vol 7 (4) ◽

pp. 447-450 ◽

Cited By ~ 1

Author(s):

Muntasir Akash ◽

Mostafa Hossain

Keyword(s):

Southeast Asian ◽

Asian Species ◽

Ganges Delta ◽

The Ganges

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A new species of Acanthopotamon Kemp, 1918 (Decapoda: Brachyura: Potamidae: Potaminae) from northeastern India, with a key to the species of the genus and notes on their distribution in relation to freshwater ecoregions

Journal of Crustacean Biology ◽

10.1093/jcbiol/ruz040 ◽

2019 ◽

Vol 39 (4) ◽

pp. 450-458

Author(s):

Sameer K Pati ◽

Santanu Mitra ◽

Darren C J Yeo

Keyword(s):

New Species ◽

Type Species ◽

Morphological Characters ◽

Terminal Segment ◽

Arunachal Pradesh ◽

Northeastern India ◽

Fourth Species ◽

Ganges Delta ◽

The Ganges ◽

A New Species

Abstract The potamid genus AcanthopotamonKemp, 1918 is known from three species, A. fungosum (Alcock, 1909), A. martensi (Wood-Mason, 1875) (type species), and A. panningi (Bott, 1966), and is found in Bangladesh, India, Nepal, and Pakistan. Within this range, the genus is found in the ‘Ganges Delta and Plain,’ ‘Lower and Middle Indus,’ and ‘Namuda-Tapi’ freshwater ecoregions. Here we describe a fourth species, A. horaisp. nov., from northeastern India (Arunachal Pradesh, Assam, and Mizoram) in the ‘Middle Brahmaputra’ and ‘Ganges Delta and Plain’ freshwater ecoregions. The new species possesses a unique suite of external and gonopod morphological characters, with the slender and narrowly conical terminal segment of the first male gonopod being particularly diagnostic. A key to the species of Acanthopotamon is provided.

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