scholarly journals Biometric differences in Ucides cordatus (LINNAEUS, 1763) (Crustacea; Brachyura; Ocypodidae) as an indicative of environmental stress

2020 ◽  
Vol 11 (2) ◽  
pp. 228-235
Author(s):  
Carmen Hellen da Silva Rocha ◽  
Thamires Barroso Lima
Keyword(s):  
Body Size ◽  
Urban Development ◽  
Environmental Changes ◽  
Condition Factor ◽  
Mangrove Ecosystem ◽  
Reference Area ◽  
Ucides Cordatus ◽  
Digital Caliper ◽  
Port Expansion ◽  
Northeast Coast

Growing urban development, port expansion, and the deployment of industries along the northeast coast of Brazil are some of the major threats to crustacean fauna that depend directly on the mangrove ecosystem to survive. In response to these environmental changes, the swamp ghost crab (Ucides cordatus) presents biological dysfunctions in body size to invest in mechanisms that regulate homeostasis. The present study aimed to evaluate the size and condition factor of crabs from two distinct mangrove areas, being an impacted area and a reference area. Male crabs were collected through the braking technique, weighed with an analytical balance and the width and length of the carapace were measured with a digital caliper. We used a t test to observe differences between two areas and different periods, and the power function (y = axb) for the ratio between the weight and width of the carapace of each individual was used in order to observe the type of growth. There were significant differences between the weight and length of the individuals between the two sample areas and the growth classified as negative allometric.

Temporal variation in the weight-size relationship of the mangrove crab Ucides cordatus L. (Decapoda: Ucididae) in relation to its life cycle phases

2014 ◽  
Vol 64 (4) ◽  
pp. 333-342 ◽  
Author(s):  
Marcos de Miranda Leão Leite ◽  
Cynthia Yuri Ogawa ◽  
Carla Ferreira Rezende ◽  
José Roberto Feitosa Silva
Keyword(s):  
Life Cycle ◽  
Condition Factor ◽  
River Estuary ◽  
Total Weight ◽  
Northeastern Brazil ◽  
Annual Life Cycle ◽  
Ucides Cordatus ◽  
Mangrove Crab ◽  
Significant Difference ◽  
The Relationship

The relationship between weight and size of individuals can be used to evaluate the status of a population, which is particularly useful for natural populations that are being exploited. Ucides cordatus occurs on the Atlantic coast of the American continent, from Florida (USA) to Santa Catarina (Brazil). This species is economically very important, most of all in the Northeastern area of Brazil, as well as in the Dominican Republic and Suriname. The objective of this study was to analyze life phases (‘fattening’, ‘matumba’, ‘milk-crab’, ‘maturation’ and ‘walking’) by use of the weight-length relationships, as well as temporal variations in this condition factor for each sex of U. cordatus. For this purpose, individuals were sampled monthly for twenty-four months at the Jaguaribe River estuary, Ceará State, Northeastern Brazil. The relationship between total weight and cephalothorax width was established using regression analysis, adjusted by a power equation. The dynamics of the condition factor were analyzed for each sex using the variation of its averages related to annual life cycle; this was done for each of the previously-mentioned phases. The relationship between total weight and cephalothorax width showed an isometric growth in males and negative allometric growth in females suggesting that, for the same reference size, males are heavier than females. When considering the average of the female condition factors, these were greater than those for males during the annual life cycle, except during the ‘maturation’ phase, which is the phase with a higher demand of energetic reserves for males. Annual variation of the condition factor in females presented no significant difference.

Grass phytoliths in surface sediments of the Sunderbans, India and their implications in reconstructing past deltaic environmental changes

The Holocene ◽  
2021 ◽  
pp. 095968362110417
Author(s):  
Madhab Naskar ◽  
Ruby Ghosh ◽  
Sayantani Das ◽  
Dipak Kumar Paruya ◽  
Binod Saradar ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Environmental Changes ◽  
Late Quaternary ◽  
Salinity Gradient ◽  
Detrended Correspondence Analysis ◽  
Mangrove Ecosystem ◽  
Sea Level Changes ◽  
Tidal Influence ◽  
Mangrove Environment ◽  
Mangrove Associate

Reliability of grass phytoliths for discriminating different deltaic sub-environments has been assessed on the modern surface sediments collected along the salinity gradient of the Sunderbans delta, India. It has been observed that grass phytolith assemblages can successfully distinguish different deltaic sub-environments especially the true mangrove zones from the mangrove associate and non-mangrove zones with minor overlaps, which further corroborated with the results of discriminant analysis (DA). Detrended correspondence analysis (DCA) and redundancy analysis (RDA) performed on the surface grass phytolith data show that salinity is the most crucial environmental parameter influencing grass phytolith distribution in the deltaic sub-environments. The potential of modern grass phytolith data in reconstructing past deltaic environmental changes has been further assessed on a late Quaternary fossil phytolith spectra from the Sunderbans spanning a sedimentary record for the last ~13.6 ka. A true mangrove environment with discernible tidal influence has been revealed between 13.6 and 3.9 ka. Absence of true mangrove–indicator grass phytoliths between ~3.9 and 2.2 ka further suggests disappearance of mangrove vegetation from this part of the Sunderbans which might have recolonized during ~2.2–0.8 ka. A mangrove associated or non-mangrove environment with little or no tidal influence came into existence in the study area since 0.8 ka onwards. A comparison with some earlier records suggests that the present grass phytolith-based palaeoenvironmental data shows conformity with the past dynamics in mangrove ecosystem in the east coast of India in respect to relative sea level changes.

scholarly journals Cell proliferation controls body size growth, tentacle morphogenesis, and regeneration in hydrozoan jellyfish Cladonema pacificum

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7579 ◽  
Author(s):  
Sosuke Fujita ◽  
Erina Kuranaga ◽  
Yu-ichiro Nakajima
Keyword(s):  
Cell Proliferation ◽  
Body Size ◽  
Environmental Changes ◽  
Size Control ◽  
Cellular Mechanisms ◽  
Proliferating Cells ◽  
Size Growth ◽  
Local Cell ◽  
Proliferating Cell

Jellyfish have existed on the earth for around 600 million years and have evolved in response to environmental changes. Hydrozoan jellyfish, members of phylum Cnidaria, exist in multiple life stages, including planula larvae, vegetatively-propagating polyps, and sexually-reproducing medusae. Although free-swimming medusae display complex morphology and exhibit increase in body size and regenerative ability, their underlying cellular mechanisms are poorly understood. Here, we investigate the roles of cell proliferation in body-size growth, appendage morphogenesis, and regeneration using Cladonema pacificum as a hydrozoan jellyfish model. By examining the distribution of S phase cells and mitotic cells, we revealed spatially distinct proliferating cell populations in medusae, uniform cell proliferation in the umbrella, and clustered cell proliferation in tentacles. Blocking cell proliferation by hydroxyurea caused inhibition of body size growth and defects in tentacle branching, nematocyte differentiation, and regeneration. Local cell proliferation in tentacle bulbs is observed in medusae of two other hydrozoan species, Cytaeis uchidae and Rathkea octopunctata, indicating that it may be a conserved feature among hydrozoan jellyfish. Altogether, our results suggest that hydrozoan medusae possess actively proliferating cells and provide experimental evidence regarding the role of cell proliferation in body-size control, tentacle morphogenesis, and regeneration.

Development of a Coupled 3D Groundwater-Vegetation Model for Coastal Wetlands

2021 ◽  
Author(s):  
Shuxin Luo ◽  
Ting Fong May Chui
Keyword(s):  
Native Species ◽  
Environmental Changes ◽  
Southern China ◽  
Saline Water ◽  
Three Dimensional ◽  
Mangrove Ecosystem ◽  
Mangrove Forests ◽  
Vegetation Model ◽  
Mangrove Species ◽  
Hydrological Conditions

<p>Mangrove forests are mainly found in the intertidal zone. Their ability to live in saline water enables them to outcompete non-mangrove vegetation in harsh and specific coastal environment. Nevertheless, they can still be invaded by alien mangrove species in suitable hydrological conditions, possibly resulting in more fragile ecosystems. Subtropical mangrove ecosystem demonstrates high variability in mangrove growth and hydrological conditions. However, their interactions are not well-understood, especially for the mangrove interspecific competition in varying groundwater conditions. To address this issue, the present study developed a coupled three-dimensional groundwater-vegetation model based on MANTRA (MANHAM-SUTRA) to simultaneously simulate groundwater hydrodynamics and mangrove distribution. The developed model was then applied to a subtropical mangrove swamp invaded by Sonneratia spp. in Mai Po Nature Reserve, Hong Kong, China. Vegetation domain is updated yearly using the annual mangrove areas extracted from remote-sensing images from 2000 to 2018. Then, multidecadal simulations were performed to validate the model in simulating the interaction between groundwater and mangrove growth. For the piezometric head, all RMS errors are smaller than 0.2 m and the correlation coefficients are larger than 0.86, which proves the effectiveness of the model in groundwater level simulation within Mai Po. The seasonal variations in the groundwater salinity were also well captured in both the fringe forest and the mudflat. The simulated biomass of Sonneratia spp. is mainly distributed at the river outlets, which is also in good agreement with the historical measurements. The validated model can then be used to predict the invasion and the distribution of the exotic mangrove species in the context of future environmental changes for better management of mangrove swamps. Since Sonneratia is a common alien species in southern China, the model can also be used for regional management of mangrove invasion and conservation of native species. The insights obtained from this study may also provide references for other similar studies examining the interaction between coastal groundwater and vegetation.</p>

Metal accumulation in Caspian sturgeons with different feeding niches, condition factor, body size and age

2017 ◽  
Vol 132 ◽  
pp. 43-48 ◽  
Author(s):  
Hadi Poorbagher ◽  
Seyed Vali Hosseini ◽  
Seyed Mehdi Hosseini ◽  
Fereidoon Aflaki ◽  
Joe M. Regenstein
Keyword(s):  
Body Size ◽  
Metal Accumulation ◽  
Condition Factor

scholarly journals KARAKTERISTIK MORFOMETRIK DAN FAKTOR KONDISI KERANG TOTOK (Polymesoda erosa) DI HUTAN MANGROVE DESA NUSAJAYA KECAMATAN WASLEI SELATAN KABUPATEN HALMAHERA TIMUR MALUKU UTARA

2015 ◽  
Vol 2 (3) ◽  
pp. 110 ◽  
Author(s):  
Alfrina Rumbiak ◽  
Jan F.W.S. Tamanampo ◽  
Gaspar D. Manu
Keyword(s):  
Body Weight ◽  
Class Size ◽  
Condition Factor ◽  
Regression Coefficient ◽  
Strong Relationship ◽  
Mangrove Ecosystem ◽  
Strong Positive Relationship ◽  
R Value ◽  
Relationship Of ◽  
The Relationship

Clam, Polymesoda erosa is species that live in sandy and muddy substrata of mangrove ecosystem. The aims of this study are to look at the relationship of the shell length and width,body thiekness, body weight and organ weight based on class size to determine the growth. The study also was designed to reveal the conditional factor based on the clam class size. The samples were collected during the day at lowest tide in January 2014. The total is 153 individuals of Polymesoda erosa clam were collected during the study. The result shows thare is a strong positive relationship between body lenght and body weight as shown within  the regression analysis with intercept (a) = 0,470779,  regression coefficient (b) = 0,69095 and correlation coefficient (r) = 0,406357. Based on the r value, it can be concluded that there is strong relationship regarding the length and weight increment as much as 40,63 %.   Keywords : Characteristics Morphometrics and Shellfish totok condition factor Nort Maluku ABSTRAK .         Kerang  totok (Polymesoda erosa) adalah salah satu jenis moluska dalam kelas bivalvia yang hidup di ekosistem mangrove pada daerah yang bersubstrat pasir dan berlumpur. Penelitian ini bertujuan. mengetahui kisaran ukuran panjang cangkang,,lebar cangakang, tubuh, berat tubuh, dan berat organ lunak, selanjutnya mengetahui pertambahan panjang, lebar cangkang, tebal tubuh, berat tubuh, dan berat organ lunak berdasarkan kelas ukuran, dan juga  mengetahui hubungan pertumbuhan panjang cangkang, dan berat cangkang, dan  mengetahui faktor kondisi kerang di setiap kelas ukuran.  Pengambilan sampel di lakukan pada siang hari saat surut terendah pada bulan januari 2014. Berdasarkan kegiatan penelitian di wilayah pesisir Desa Nusajaya Kecamatan Waslei Selatan Kabupaten Halmahera Timur Maluku Utara, dikumpulkani  153 individu kerang totok (Polymesoda erosa). Hasil analisis regresi menunjukkan bahwa setiap pertambahan panjang cangkang akan diikuti dengan pertambahan berat secara proporsional mengikuti nilai Intercept (a) = 0.470779, dan koefisien regresi (b) = 0,690957. Niilai koefisien korelasi (r) = 0. 406357 menyatakan  adanya korelasi positif yang menerangkan terdapat keeratan hubungan  antara pertambahan panjang cangkang dengan pertambahan berat berat tubuh sebesar 40.63 %   Kata kunci :Karakteristik Morfometrik dan Faktor kondisi KerangTotok Maluku utara   1Bagian dari skripsi 2Mahasiswa Program Studi Manajemen Sumberdaya Perairan FPIK-UNSRAT 3Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi  

scholarly journals A substituição das técnicas tradicionais de captura do caranguejo-uçá (Ucides cordatus) pela técnica “redinha” no estuário do rio Mamanguape, Paraíba

2012 ◽  
Vol 11 (2) ◽  
pp. 113 ◽  
Author(s):  
Douglas Macêdo Do Nascimento ◽  
José Da Silva Mourão ◽  
Rômulo Romeu Nóbrega Alves
Keyword(s):  
Environmental Impacts ◽  
River Estuary ◽  
Mangrove Ecosystem ◽  
Gallery Forest ◽  
Ucides Cordatus ◽  
Harvesting Method ◽  
Rapid Transition ◽  
Harvesting Techniques ◽  
The Cost ◽  
Traditional Fishing

Two traditional fishing communities situatedon the margins of the Mamanguape River estuary-mangrove complex, Paraiba State, Brazil, were studied to determine themotivations for their rapid transition from traditional harvesting techniques (braceamento and tapamento) to redinha(little-net) trapping. Our results indicate that the crab harvesters were prompted into changing their techniques primarilydue to higher production rates with redinha. Additionally, there were disadvantages in using both the braceamento andtapamento techniques (including greater chances of accidents and acquiring diseases) that reinforced this transition. Thebehavioral characteristic of the crabs living in denser gallery forest specifically hindered capture using the braceamentotechnique. This fast transition of harvesting techniques is a major concern from a conservation standpoint as the redinhacauses environmental impacts and threatens both the mangrove ecosystem and the populations of caranguejo-uçá crabs(Ucides cordatus). Thus this study examined a problem that is both environmental and social, as traditional techniqueswere less profitable than the new harvesting method but had much less impact – while the redinha helps with crabharvesting and increases income at the cost of higher environmental impacts.

scholarly journals The combined effects of temperature and aromatase inhibitor on metamorphosis, growth, locomotion, and sex ratio of tiger frog (Hoplobatrachus rugulosus) tadpoles

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8834
Author(s):  
Yun Tang ◽  
Zhi-Qiang Chen ◽  
You-Fu Lin ◽  
Jing-Yi Chen ◽  
Guo-Hua Ding ◽  
...  
Keyword(s):  
Body Size ◽  
Survival Rate ◽  
Sex Ratio ◽  
Aromatase Inhibitor ◽  
Condition Factor ◽  
Sex Ratios ◽  
Control Group ◽  
Treatment Groups ◽  
Effects Of Temperature ◽  
Steroid Hormone Level

Background The tiger frog (Hoplobatrachus rugulosus) is widely raised by many farms in southern region of China as an economically edible frog. The growth, development, and sexual differentiation of amphibians are influenced by temperature and steroid hormone level. However, the problem of hormone residues is caused by the addition of exogenous hormones in frog breeding, it is worth considering whether non-sterol aromatase inhibitors can be used instead of hormones. Methods In our study, H. rugulosus tadpoles were subjected to two water temperatures (29 °C and 34 °C) and three letrozole concentrations in the feed (0, 0.1 and 1 mg/g) to examine the effects of temperature, aromatase inhibitor and their interaction on metamorphosis, locomotion, and sex ratios. A G-test and contingency table were used to analyze the metamorphosis rate of tadpoles and the survival rate of froglets after feeding for 90 days. A G-test was also used to analyze sex ratios in different treatment groups. Results Metamorphosis time and body size (snout–vent length, body mass and condition factor) were significantly different between the two temperature treatments. Metamorphosis time was longer and body size was increased at 29 °C compared to those at 34 °C. Letrozole concentration and the temperature × letrozole interaction did not affect these variables. The jumping distance of froglets following metamorphosis was positively associated with the condition factor; when controlling for condition factor, jumping distance was not affected by temperature, letrozole concentration and their interaction. Temperature and letrozole concentration also did not affect metamorphosis and survival rate. Sex ratio of the control group (0 mg/g letrozole) was 1:1 at 29 °C, but there were more males at 34 °C. The sex ratios of H. rugulosus treated with letrozole at 29 °C and 34 °C were significantly biased toward males, and male ratio increased as letrozole concentration increased. Furthermore, more males were produced at 34 °C than at 29 °C at each letrozole concentration.

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