The relative importance of orange spot coloration and total length of males in female guppy mate preference

ABSTRACTObjective. The feeding habits of Cocobolo (Andinoacara pulcher) in the cienaga Grande de Lorica, Sinu river basin, were studied. Materials and methods. The stomach content was analyzed using the Proportion of empty stomachs, Grade of digestion, Frequency of occurrence, numerical Frequency, Gravimetry, relative importance Index (RII) and the gut length-total length relationship. Results. 39.8% of stomachs were empty, 47.1% of preys were fresh and five food groups were identified. Vegetable remains was the most frequent group (63.8%) and the prey with greatest composition in weight (33.5%), while Rest of fishes was the most abundant group (34.7%). It was observed that in low and rising waters, fishes was the most consumed prey, while that in high and falling waters the most consumed prey was vegetable remains. Vegetable remains, detritus and fishes were food groups of secondary relative importance, while Insects and Others were circumstantial or incidental groups. Conclusions. The results achieved indicate that Cocobolo is a fish with omnivores feeding habits with a preference for fishes and vegetable remains. RESUMEN Objetivo. Se estudiaron los hábitos alimentarios de Cocobolo (Andinoacara pulcher) en la ciénaga Grande de Lorica, cuenca del río Sinú, Colombia. Materiales y Métodos. El contenido estomacal se evaluó con el Coeficiente de vacuidad, Grado de llenado, Grado de digestión, Frecuencia de ocurrencia, Frecuencia numérica, Gravimetría, Índice de importancia relativa y la relación longitud intestinal- longitud total. Resultados. El 39.8% de los estómagos se encontró vacío, el 47.1% de las presas en estado fresco y se identificaron cinco grupos alimentarios. Material vegetal fue el grupo más frecuente (63.8%) y con mayor composición por peso (33.5%), mientras que Restos de peces fue el más abundante (34.7%). Se observó que en aguas bajas y en aguas ascendentes, peces fue la presa más consumida, mientras que en aguas altas y aguas descendentes, fue material vegetal. Material vegetal, detritos y restos de peces fueron grupos alimentarios de importancia relativa secundaria, mientras que insectos y otros fueron circunstanciales o incidentales. Conclusiones. Los resultados alcanzados indican que Cocobolo es un pez de hábitos alimentarios omnívoros con preferencia por peces y material vegetal.

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Optimized skeletal morphologies of silicoflagellate generaDictyochaandDistephanus

Paleobiology ◽

10.1017/s0094837300009453 ◽

1989 ◽

Vol 15 (3) ◽

pp. 283-298 ◽

Cited By ~ 24

Author(s):

Kevin McCartney ◽

David E. Loper

Keyword(s):

Mathematical Model ◽

Surface Area ◽

Basal Area ◽

Apical Surface ◽

Relative Importance ◽

Simple Mathematical Model ◽

Similar Model ◽

Skeletal Morphology ◽

Total Length ◽

Internal Volume

Several groups of siliceous microorganisms possess a skeletal latticework of interconnected rods. Skeletal configurations of one of these groups, the silicoflagellates, can be produced by a simple mathematical model that minimizes the apical surface area for a given basal area and internal volume. A similar model that minimizes the total length of the skeletal elements, and thus the silica utilization and skeletal weight, produces configurations that are generally less common in silicoflagellates. The diversity of silicoflagellate skeletal morphologies suggests that both the minimization of apical surface area and the conservation of skeletal material may be important factors in skeletal design. The two most important morphologies found in modern oceans, the four-sidedDictyochaand the six-sidedDistephanus, can co-occur in an environment where both factors have some relative importance. However, these models do not explain the range of silicoflagellate skeletal morphology found in nature.

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Use of digitally modified videos to examine female mate preference for orange spot coloration of males in the guppy, Poecilia reticulata

Ichthyological Research ◽

10.1007/s10228-006-0364-0 ◽

2006 ◽

Vol 53 (4) ◽

pp. 398-405 ◽

Cited By ~ 18

Author(s):

Aya Sato ◽

Kenji Karino

Keyword(s):

Poecilia Reticulata ◽

Mate Preference ◽

Female Mate Preference ◽

Female Mate ◽

Orange Spot

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Feeding habit of Brown trout (Salmo trutta fario) in upper parts of river Swat, Pakistan

Brazilian Journal of Biology ◽

10.1590/1519-6984.239219 ◽

2022 ◽

Vol 82 ◽

Author(s):

W. Khan ◽

S. M. H. M. Naqvi ◽

H. Ullah Khan ◽

M. Rafiq ◽

B. Ahmad ◽

...

Keyword(s):

Body Weight ◽

Brown Trout ◽

Salmo Trutta ◽

Gut Contents ◽

Relative Importance ◽

Feeding Intensity ◽

Total Length ◽

Index Of Relative Importance ◽

The Relationship ◽

Salmo Trutta Fario

Abstract Salmo trutta fario is the most important fish species of family Salmonidae inhibited in cool waters all over the world including the nortern parts of Pakistan. This study was aimed to find out the prey selection and feeding habits of the species. One hundred and eighty five Salmo trutta fario were captured from March 2016 to April 2017. Feeding intensity as represented by a fullness index (FI), changing with various length groups and season. Out of 185 Brown trout 24 fish stomaches were found empty. The most important and common food items of brown trout were Brachycentridae, Blepharocera, Hydropsychidae, ephemerella spp. Kruskal Wallis H-test were applied on feeding intensity groups consisting of three month group. The test statistic for K.W-H-test were (H=8.13 with df =3) had a p-value of 0.043 < (alpha=0.05 indicates favor of the alternative hypothesis of at least one difference among the feeding intensity groups. The linear relationship of N with index of relative importance and %IRI denoted by least square regression line (N = 35.2 + 22.1%IRI), shows that for 22 prey there is 1% change in IRI. The relationship between total length (mm) and fish body weight (gm) is expressed by Pearson correlation coefficient (r = 0.976), showed that total length (mm) and fish body weight (gm.) is highly correlated. Descriptive statistics are used for the stomach fullness, which shows that feeding intensity was recorded higher from March to May. A total of 2289 preys was recorded including the most common were; Trichoptera, Hydropsychidae, Brachycentridae, diptera, blepharocera, ephemerala, chironomida, honey bees, grass hopper, locust, trout egg, trochanter, plant tissue, stones were retrieved from the gut contents of brown trout. According to index of relative importance IRI% four preys represents major components of the diet. The highest IRI% was recorded in Brachycentridae (39.38%), followed by blepharocera (13.23%), Hydropsychidae (10.76%) and ephemerella spp (8.28%). The relationship between IRI and FO is (r =0.556) is moderately correlated with coefficient of determination (r2=0.31). This study will help in the development of an artificial diet for the species for better growth performance in captivity.

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Conservation, Ecology, and Management of Catfish: The Second International Symposium

Conservation, Ecology, and Management of Catfish: The Second International Symposium ◽

10.47886/9781934874257.ch40 ◽

2011 ◽

Keyword(s):

Life History ◽

Body Size ◽

Habitat Selection ◽

Early Life ◽

Early Life History ◽

Interstitial Space ◽

Relative Importance ◽

Limited Information ◽

Total Length ◽

Flathead Catfish

<em>Abstract</em>.—Little is known about habitat requirements of juvenile flathead catfish <em>Pylodictis olivaris</em>. Previous studies indicate use of coarse substrates associated with riffle habitats in streams; however, limited information on microhabitat characteristics associated with habitat selection exists. To further our understanding of early life history habitat for flathead catfish, we used polyvinyl chloride half tubes (i.e., tubes cut in half longitudinally) of six different diameters (range, 13–76 mm) and depths (range, 25–152 mm) to simulate interstitial spaces provided by coarse substrates and determine (1) whether juvenile flathead catfish selected for interstice size, (2) relative importance of interstitial diameter and depth, and (3) if interstitial space size selection was related to fish body size. A total of 1,316 selection trials regarding interstitial diameter, depth, and the interaction of these characteristics was conducted using juvenile flathead catfish ranging in total length (TL) from 15 to 128 mm. Utilization of interstice diameters and depths was nonrandom (i.e., selection was occurring). Selection of interstice diameter was positively related to fish body size (i.e., total length), whereas all sizes of juvenile flathead catfish most often selected the greatest depth of interstitial space offered. We observed an ontogenetic shift in relative importance of interstice diameter and depth during interaction trials. Flathead catfish less than 40 mm TL selected for interstitial diameter, fish between 41 and 60 mm TL selected for both interstitial characteristics, whereas individuals larger than 60 mm TL selected for interstitial depth. Results of our study are among the first to identify microhabitat-scale characteristics that influence habitat selection by early life history stages of this species.

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