scholarly journals Dynamics of water and salt exchange at Maryland Coastal Bays

2017 ◽  
Vol 189 ◽  
pp. 1-16 ◽  
Author(s):  
Xinyi Kang ◽  
Meng Xia ◽  
Joseph S. Pitula ◽  
Paulinus Chigbu
Author(s):  
Rehab Elfadul ◽  
Roman Jesien ◽  
Ahmed Elnabawi ◽  
Paulinus Chigbu ◽  
Ali Ishaque

Contaminants of Emerging Concern (CECs) with estrogenic or estrogenic-like activity have been increasingly detected in aquatic environments and have been an issue of global concern due to their potential negative effects on wildlife and human health. This study used the MCF-7 cell proliferation assay (E-Screen) to assess the estrogenic activity profiles in Maryland Coastal Bays (MCBs), a eutrophic system of estuaries impacted by human activities. Estrogenic activity was observed in all study sites tested. Water samples from MCBs increased MCF-7 cell proliferation above the negative control from 2.1-fold at site 8, located in Sinepuxent Bay close to the Ocean City Inlet, to 6.3-fold at site 6, located in Newport Bay. The proliferative effects of the sediment samples over the negative control ranged from 1.9-fold at the Assateague Island National Seashore site to 7.7-fold at the Public Landing site. Moreover, elevated cell proliferation (p < 0.05) was observed when cells were co-exposed with 17ß-Estradiol (E2), while reduction in cell proliferation was observed when cells were co-exposed with the antagonist ICI 182, 780 suggesting that cell proliferative effects were primarily mediated by the estrogen receptor (ER). These results suggest the occurrence of some estrogenic or hormonal-like compounds in the MCBs and are consistent with our previous findings based on vitellogenin analyses.


2020 ◽  
Vol 36 (6) ◽  
Author(s):  
Dev P. Gurung ◽  
Nianhong Chen ◽  
Yan Waguespack ◽  
Douglas E. Ruby ◽  
Ali B. Ishaque ◽  
...  

Estuaries ◽  
1997 ◽  
Vol 20 (2) ◽  
pp. 319 ◽  
Author(s):  
J. R. Maxted ◽  
S. B. Weisberg ◽  
J. C. Chaillou ◽  
R. A. Eskin ◽  
F. W. Kutz

2017 ◽  
Vol 41 (2) ◽  
pp. 495-506 ◽  
Author(s):  
Efeturi U. Oghenekaro ◽  
Paulinus Chigbu ◽  
Ozuem F. Oseji ◽  
Kam W. Tang

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11740
Author(s):  
Andrés G. Morales-Núñez ◽  
Paulinus Chigbu

Carinacuma, a new bodotriid cumacean genus, is diagnosed to receive Spilocuma watlingi Omholt & Heard as its type species and C. umesi sp. nov., described from shallow waters (0.8 to 2.8 m) on the Mid-Atlantic coast of North America. Carinacuma gen. nov. has its closest affinities to the North American genera Spilocuma and Mancocuma, but can be distinguished from them and the other genera within the subfamily Vaunthompsoniinae by a combination of characters, including the presence of a dorsal carina or keel on pereonite 3 of the female, morphology of the antenna, absence of pleopods in the male, and the setation and segmentation of the uropods. Carinacuma umesi sp. nov., can be differentiated from its northern Gulf of Mexico cognate, C. watlingi comb. nov. by several characters, including: (1) maxilliped 3 carpus of female with inner margin bearing four to five simple setae, (2) uropod peduncle of female with inner margin bearing one sub-distal micro-serrate seta with single sub-terminal medial setule, (3) male antennule peduncle articles 1–2 sub-equal length, and (4) male antennule accessory flagellum slightly longer than basal article of main flagellum. A key to the five known males lacking pleopods within Vaunthompsoniinae is provided.


Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 368 ◽  
Author(s):  
Ozuem Oseji ◽  
Chunlei Fan ◽  
Paulinus Chigbu

Maryland Coastal Bays (MCBs) have undergone changes in water quality in the past two decades due to nutrient enrichment but the composition and dynamics of the phytoplankton community have not been adequately described. Microscopic counts and photosynthetic pigments of samples collected monthly in 2012 at selected sites in MCBs that differed with regard to the degree of anthropogenic impacts were examined. Sixty-three (63) phytoplankton genera were recorded, of which 40 species are being reported for the first time in the Bays. Among the dominant species were Dactyliosolen fragilissimus (Bacillariophyta), Paulinella ovalis (Cercozoa) and Cryptomonas sp. (Cryptophyta). Bloom densities of Heterocapsa rotundata (Miozoa), which previously had not been reported in the Bays, were observed bay-wide in December, particularly at the mouth of St. Martin River. Diatoms dominated (>40%) the phytoplankton community in winter and decreased in spring (<40%), while Cercozoa and microphytoflagellates (MPF) co-dominated in summer (July). From August to October, diatoms dominated with maximum contributions from an unidentified small (<10 µM) centric species and co-dominated the assemblage with cryptophytes in late fall (November). Canonical correspondence analysis indicated that diatoms were favored by high salinity and total dissolved phosphorus (TDP), cercozoans and chlorophytes by total dissolved nitrogen (TDN) and cryptophytes by dissolved organic carbon. The spatial and seasonal differences in the composition of phytoplankton species, coupled with the occurrence of potentially toxic species and bloom densities of H. rotundata suggest that important changes have occurred in the phytoplankton assemblage that likely have affected the food web of these eutrophic bays.


Sign in / Sign up

Export Citation Format

Share Document