scholarly journals Comparative analysis of the diet composition and its relation to morphological characteristics in Achirus mazatlanus and Syacium ovale (Pleuronectiformes: Osteichthyes) from a Mexican Pacific coastal lagoon

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Sandra Carolina Padilla-Gutierrez ◽  
Gaspar González-Sansón ◽  
Consuelo María Aguilar-Betancourt ◽  
Juan Ramón Flores-Ortega
Keyword(s):  
Coastal Lagoon ◽  
Diet Composition ◽  
Feeding Habits ◽  
Morphological Characteristics ◽  
Optimal Foraging Theory ◽  
Mexican Pacific ◽  
Recent Developments ◽  
Food Content ◽  
Relationship Of ◽  
The Relationship

ABSTRACT The purpose of this research was to investigate differences in diet composition between Achirus mazatlanus and Syacium ovale, two flatfishes inhabiting in a tropical coastal lagoon and to investigate the relationship of their feeding habits to size, body morphometry and mouths characteristics. Fish were collected during sampling trips conducted regularly from 2011 to 2016 using several types of fishing gear. Total number of analyzed stomachs with some food content was 328 for Achirus mazatlanus from 1.4 to 21.3 cm total length (TL) and 203 for Syacium ovale with 1.3 to 24.0 cm TL. Results indicate that both species share a general diet based on benthic invertebrates and fishes but S. ovale has a more piscivorous habit, which can be explained by a more slender body shape and larger teeth, characteristics which increase prey fish catching performance. Important changes in composition of food categories related to size were not found for any species, but larger fish of both species eat larger ranges of prey sizes, and this ontogenetic change is consistent with recent developments on optimal foraging theory.

scholarly journals Comparative analysis of diet composition and its relation to morphological characteristics in juvenile fish of three lutjanid species in a Mexican Pacific coastal lagoon

2017 ◽  
Vol 15 (4) ◽  
Author(s):  
Consuelo M. Aguilar-Betancourt ◽  
Gaspar González-Sansón ◽  
Juan R. Flores-Ortega ◽  
Daniel Kosonoy-Aceves ◽  
Gabriela Lucano-Ramírez ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Body Shape ◽  
Diet Composition ◽  
Juvenile Fish ◽  
Morphological Characteristics ◽  
Niche Overlap ◽  
Trophic Niche ◽  
Mexican Pacific ◽  
Optimum Foraging ◽  
General Diet

ABSTRACT The main goal of this research was to investigate the differences in diet composition among three species of the genus Lutjanus inhabiting a coastal lagoon as juveniles. The working hypothesis was that these species feed on a common base of food resources and therefore, some niche overlap is present in terms of general diet composition. However, changes in the trophic niche with size and differences in some morphological traits among species explain observed differences in diet. Fish were collected during 42 sampling trips conducted regularly from February 2011 to January 2012 using several types of fishing gear. Total number of analyzed stomachs was 288 for Lutjanus argentiventris from 2.3 to 19.9 cm total length (TL); 178 for Lutjanus colorado ranging from 2.4 to 30.1 cm TL; and 183 for Lutjanus novemfasciatus with 1.2 to 20.0 cm TL. Results indicate that juveniles of all three lutjanid species share a general diet based on decapods and fishes. However, L. novemfasciatus has a more piscivorous habit, which can be explained by a more slender body shape and larger teeth, characteristics, which increase fish catching performance. Larger fish of all three species eat larger prey, which is consistent with the optimum foraging theory.

scholarly journals HUBUNGAN TINGKAT PEMAHAMAN KARAKTERISTIK MORFOLOGI HEWAN DENGAN KEMAMPUAN MENGHAFAL NAMA LATIN HEWAN PADA SISWA KELAS X IPA SMA NEGERI 3 JEMBER

EDUSAINS ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 20-29
Author(s):  
M Ubaidilah Hasan ◽  
Ira Nurmawati
Keyword(s):  
Correlation Coefficient ◽  
Morphological Characteristics ◽  
Quantitative Approach ◽  
Ex Post ◽  
Ex Post Facto ◽  
Kendall Correlation ◽  
Level Of Understanding ◽  
Relationship Of ◽  
The Relationship ◽  
Morphology Characteristics

THE RELATIONSHIP OF STUDENTS' UNDERSTANDING LEVEL OF ANIMAL MORPHOLOGY CHARACTERISTICS WITH THE ABILITY TO MEMORIZE ANIMAL LATIN NAMES IN GRADE 10 IPAAbstractAnimal taxonomy subjects often use animal's Latin names. Many students think that this subject is annoying because it is dominated by memorizing animal's Latin names, even though memorizing becomes a prerequisite for understanding. Meanwhile, most of the language materials memorized need an understanding before the memorizing process. This study aimed to find a relationship between the level of students' understanding of an animal's morphological characteristics and the ability to memorize animal's Latin names at the Xth grade of IPA students in SMAN 3 Jember. This study used a quantitative approach with a type of ex post facto. The test obtained the data. Then it was descriptively and inferentially analyzed by Kendall correlation. This research indicated that 56 students who answered test of the level of understanding animal's morphological characteristics and the ability to memorize animal's Latin names resulted in a correlation coefficient of score 0.673, and significance 0,000 < 0.05. Therefore, if the level of students’ understanding of an animal's morphological characteristics increased, the ability to memorize animal's Latin names at the Xth grade of IPA students in SMAN 3 Jember also increased, conversely. AbstrakNama latin hewan sering digunakan dalam materi taksonomi hewan. Banyak siswa beranggapan bahwa materi tersebut membosankan karena didominasi oleh menghafal nama latin hewan, padahal menghafal menjadi prasyarat pemahaman. Sementara itu, sebagian besar materi bahasa yang dihafal membutuhkan pemahaman sebelum proses menghafal berlangsung. Tujuan penelitian ini ialah mengetahui hubungan tingkat pemahaman karakteristik morfologi hewan dengan kemampuan menghafal nama latin hewan pada siswa kelas X IPA SMA Negeri 3 Jember. Penelitian ini menggunakan pendekatan kuantitatif dengan jenis eks post facto. Data didapatkan menggunakan instrumen tes. Kemudian dianalisis secara deskriptif dan inferensial menggunakan korelasi Kendall. Penelitian ini menunjukkan bahwa dari 56 siswa yang menjawab tes tingkat pemahaman karakteristik morfologi hewan dan kemampuan menghafal nama latin hewan menghasilkan koefisien korelasi 0,673 dan signifikansi 0,000 < 0,05. Dengan demikian, jika tingkat pemahaman karakteristik morfologi hewan meningkat, kemampuan menghafal nama latin hewan pada siswa kelas X IPA SMA Negeri 3 Jember juga meningkat, begitupula sebaliknya. 

scholarly journals A comparative study of the brains in pleuronectidae

1937 ◽  
Vol 122 (828) ◽  
pp. 308-343 ◽  
Keyword(s):  
Comparative Study ◽  
Medulla Oblongata ◽  
Royal Society ◽  
Feeding Habits ◽  
Serial Sections ◽  
Naked Eye ◽  
The Family ◽  
Relationship Of ◽  
The Relationship ◽  
The Brain

Part I. The Medulla Oblongata, And Its Variations Acoording To Diet And Feeding Habits In previous communications to this Society the relationship of the habits of feeding and diet to the form and pattern of the medulla oblongata has been described in the cyprinoids, clupeids, and gadoids (Evans, 1931, 1932, 1935). This research takes up a similar study of the brain of the Pleuronectidae. The expense has been borne by a grant from the Royal Society for which the author tenders his grateful thanks. It has seemed to be desirable to extend the observations to the fore- and mid-brain, as in some members of the family these present a very marked development. In order to elucidate some of the problems that arise I have also studied the brain of the eel, and some interesting conclusions have resulted. We find, as a result of examination by the naked eye and of serial sections, that we can divide the following species into four groups as follows: I. The sole, Solea vulgaris .

Notes on the genus Cactodera Krall & Krall, 1978 and proposal of Betulodera betulae gen. nov., comb. nov. (Nematoda: Heteroderidae)

Nematology ◽  
2002 ◽  
Vol 4 (7) ◽  
pp. 875-882 ◽  
Author(s):  
Dieter Sturhan
Keyword(s):  
Adaptive Radiation ◽  
New Genus ◽  
Morphological Characteristics ◽  
Sensu Stricto ◽  
Lateral Field ◽  
Second Stage ◽  
Species Inquirenda ◽  
Definition Of ◽  
Relationship Of ◽  
The Relationship

AbstractBased mainly on an analysis of the host ranges of the species presently placed in Cactodera, sensu lato, and of selected morphological characteristics, an attempt is made to improve the definition of the genus which, after exclusion of C. betulae and C. johanseni, is considered to be monophyletic. The host range of Cactodera, sensu stricto, appears to be restricted to the subclass Caryophyllidae with the ten known species showing an adaptive radiation on host genera in five families of the orders Caryophyllales and Polygonales. This may be a result of co-evolution. Cactodera betulae cannot be assigned to any of the presently recognised genera of cyst-forming nematodes and therefore Betulodera gen. nov. is proposed with B. betulae comb. nov. as the type and only species. The relationship of Betulodera gen. nov. to other genera of Heteroderidae and to some undescribed heteroderid species has still to be evaluated. The new genus is characterised by circumfenestrate cysts with only a slightly protruding vulval cone, three incisures in the lateral field of the second-stage juveniles and presence of phasmids in the males. The hosts are in unrelated plant orders and subclasses. Cactodera aquatica, a species inquirenda, is returned to the genus Heterodera and Heterodera johanseni (Sharma et al. , 2001) comb. nov. is proposed for C. johanseni.

scholarly journals The Relationship of Sediment and Intersitial Water Properties with Mangrove Health in a Subtropical Coastal Lagoon of Mexico

Estuary ◽  
2018 ◽  
Author(s):  
Carlos Augusto Zenteno-Palma ◽  
Aramis Olivos-Ortiz ◽  
María del Carmen Álvarez ◽  
Sonia Isabel Quijano-Scheggia ◽  
Gloria Alicia Jiménez-Ramón
Keyword(s):  
Coastal Lagoon ◽  
Water Properties ◽  
Relationship Of ◽  
The Relationship

scholarly journals Fotosíntesis y economía del carbono en plantas superiores

2017 ◽  
pp. 41
Author(s):  
Alejandro E. Castellanos-V.
Keyword(s):  
Natural Environment ◽  
Practical Importance ◽  
Physiological Ecology ◽  
Plant Production ◽  
Future Developments ◽  
The Future ◽  
Recent Developments ◽  
Relationship Of ◽  
The Relationship ◽  
Carbon Economy

One of the subjects of physiological ecology which has reached the greatest development and practical importance is the study of photosynthesis and carbon economy in plants growing in the natural environment. In this paper the recent Developments in this field are analyzed emphasizing the relationship of the plant production physiology with growth and architecture and also with organ movement. The future developments in the field are discussed.

THE RELATIONSHIP OF EXCHANGEABLE CATIONS IN THE B HORIZONS TO THE FIELD SEPARATIONS OF SOLONETZIC AND CHERNOZEMIC SOILS

1964 ◽  
Vol 44 (1) ◽  
pp. 43-49 ◽  
Author(s):  
A. K. Ballantyne ◽  
J. S. Clayton
Keyword(s):  
Morphological Characteristics ◽  
Exchangeable Cations ◽  
Soil Survey ◽  
Exchangeable Cation ◽  
Exchangeable Sodium Percentage ◽  
Exchangeable Sodium ◽  
Sodium Percentage ◽  
Exchangeable Magnesium ◽  
Relationship Of ◽  
The Relationship

Exchangeable cation data are presented for 97 Solonetzic and 131 Chernozemic B horizons from profiles sampled on morphological characteristics, by the Saskatchewan Soil Survey. The average exchangeable sodium percentage in the B horizons of the Calcareous, Orthic, and Eluviated Chernozems was 0.95, 1.3, and 2.6; and in the Bn horizons of the Solonetz, Solodized Solonetz, and Solod was 4.5, 9.4, and 4.0.Using the chemical criteria accepted by the National Soil Survey Committee of Canada for a n horizon (over 12% exchangeable sodium or more exchangeable sodium plus magnesium than calcium) only 28, 74, and 41% of the Solonetz, Solodized Solonetz, and Solod, as classified in the field, would remain in the Solonetzic Order. On the basis of exchangeable cations, 4% of the Orthic and 20% of the Eluviated Chernozems would fall within the Solonetzic Order because of high exchangeable magnesium.It is proposed that a Solonetzic B horizon on the basis of chemistry be one that contains more than 4% exchangeable sodium and has a ratio of exchangeable calcium to sodium of 10 or less, in order to exclude Chernozemic soils with high exchangeable magnesium from the Solonetzic Order.

scholarly journals Association of morphological and water factors with irrigated forage cactus yield

2017 ◽  
Vol 21 (9) ◽  
pp. 600-605 ◽  
Author(s):  
Marcela L. Barbosa ◽  
Thieres G. F. da Silva ◽  
Sérgio Zolnier ◽  
Servulo M. S. e Silva ◽  
José E. F. de Morais ◽  
...  
Keyword(s):  
Soil Water ◽  
Correlation Matrix ◽  
Water Regime ◽  
Morphological Characteristics ◽  
Plant Morphology ◽  
Actual Evapotranspiration ◽  
Productive Capacity ◽  
The Moment ◽  
Relationship Of ◽  
The Relationship

ABSTRACT This study aimed to understand the relationship of morphological characteristics and actual evapotranspiration of forage cactus clones with their productive capacity under different water regimes. The data used in this study were collected between the years 2012 and 2013, in Serra Talhada, State of Pernambuco. The clones Sertânia IPA - IPA, Miúda - MIU and Orelha de Elefante Mexicana - OEM were submitted to three irrigation depths (2.5, 5.0 and 7.5 mm) and three irrigation intervals (7, 14 and 28 days). Cladode and plant morphology, accumulated actual evapotranspiration and yield were obtained at the moment of harvest. Pearson’s correlation matrix was elaborated and, in the sequence, multicollinearity, canonical and path analysis were applied. There was no correlation of yield with the soil water supply and actual evapotranspiration of the clones (p > 0.05). Forage cactus yield was more associated with peculiarities of the morphological characteristics of the clones than with the different soil water supplies or the crop actual evapotranspiration. However, regardless of the water regime and clone, the vigor of the basal cladodes was highly decisive for the expression of the forage cactus productive capacity.

scholarly journals Intraspecific variation in adult Uvitellina iraquensis Dronen, Ali & Al-Amura, 2013 (Cyclocoelidae: Haematotrephinae) from two collection sites of white-tailed lapwing, Vanellus leucurus (Lichtenstein) (Charadriiformes: Charadriidae), in Iraq

Zootaxa ◽  
2017 ◽  
Vol 4242 (1) ◽  
pp. 1 ◽  
Author(s):  
NORMAN O. DRONEN ◽  
NOTHIALA R. AL-KASSAR ◽  
ATHEER H. ALI ◽  
MOHANAD F. ABDULHAMEED ◽  
BASIM H. ABDULLAH ◽  
...  
Keyword(s):  
Oral Sucker ◽  
Morphological Characteristics ◽  
The Body ◽  
Width Ratio ◽  
Similar Species ◽  
Collection Site ◽  
North Eastern ◽  
Relationship Of ◽  
The Relationship ◽  
Southern Iraq

A total of 19 white-tailed lapwing, Vanellus leucurus, were collected from Huwazah Marsh, north-eastern Basrah Province, Iraq from February to March and in October, 2011 (collection site #1) and 60 V. leucurus were collected from Al-Hammar Marshes, Thi-Qar Province, southern Iraq from July to November, 2012 (collection site #2), and examined for cyclocoelids. Nineteen Uvitellina iraquensis Dronen, Ali & Al-Amura, 2013 from site #1 and 17 specimens from site #2 were fixed with minimal compression for comparisons of morphological characteristics, measurements, morphometric percentages and morphometric ratios commonly used to distinguish species of cyclocoelids. An additional five adult specimens from site #1 were fixed without compression for comparisons. Specimens from site # 1 (n=24) represented only fully-developed, non-senescing adults, while those from site #2 (n=17) could be divided into fully-developed (non-senescing) adults (n=8); younger (smaller, less developed) adults (n=5) and senescing adults (n=4). The following characteristics were relatively consistent, and appeared to be valuable in identifying groups of similar species and distinguishing species in Uvitellina: the presence or absence of the oral sucker; the oral sucker/pharynx width ratio; the posterior extent of the cirrus sac relative to the intestinal bifurcation; the position of the genital pore relative to the pharynx; the position of the testes in the body; the length of the intertesticular space; the length of the posttesticular space; the lateral disposition of the uterine loops; the presence of a posteriorly-directed, tail-like extension off the posterior confluence of the vitelline fields; the posterior extent of the uterine loops relative to the gonads; and the size of fully-developed eggs. It may be beneficial to calculate the percentage that measurements represent relative to the body length to provide insight into the relationship of the size of a structure to increased size of the specimens (growth). Specimens fixed without compression appeared to be less uniform, less symmetrical, shorter, more distorted and the internal details were more difficult to see. 

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