Mouth area analysis by the use of selected spectral energies

The present study examines the feeding habits of anchovy (Engraulis encrasicolus), sardine (Sardina pilchardus) and round sardinella (Sardinella aurita). The results are combined with previously published information on feeding-related morphological features (i.e. mouth area, intestine length and tail area) in order to explore morphological affinities between species and the effect of ecomorphology on their co-existence. These species were mainly zooplanktivorous and no dietary differences were found with sex and season. Anchovy preyed mainly on Crustacea larvae, whereas sardine and round sardinella on Copepoda. In the majority of cases (>90%), the individual fractional trophic level of all species ranged between 3.0 and 3.5, classifying them as omnivores with preference to animals. The feeding-related morphological features differed between anchovy and the two other species, whereas only intestine length differed between sardine and round sardinella. The fact that round sardinella’s diet and morphology show a greater resemblance to those of sardine, further support the hypothesis that is a particulate feeder as sardine. Hence the three species tend to exploit the same food resources differently throughout the year. Thus, they make best use of the environment and its resources, in order to avoid competition and achieve optimum feeding conditions throughout their life cycles

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Pollution of Volga Mouth Area

Water Resources ◽

10.1134/s0097807820020128 ◽

2020 ◽

Vol 47 (2) ◽

pp. 294-303

Author(s):

V. G. Petrechenkova ◽

I. G. Radovanova

Keyword(s):

Mouth Area

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Combined influence of river discharge and wind on littoral nematode communities of a river mouth area of Lake Constance

Aquatic Ecology ◽

10.1007/s10452-006-9076-9 ◽

2007 ◽

Vol 41 (2) ◽

pp. 231-242 ◽

Cited By ~ 2

Author(s):

A. Witthöft-Mühlmann ◽

W. Traunspurger ◽

K. O. Rothhaupt

Keyword(s):

River Discharge ◽

River Mouth ◽

Mouth Area ◽

Lake Constance ◽

Nematode Communities ◽

River Mouth Area

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Why should the Odra River mouth area not be regarded as an estuary? A geologist's point of view

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-007-0011-8 ◽

2007 ◽

Vol 36 (2) ◽

Cited By ~ 2

Author(s):

Andrzej Osadczuk ◽

Stanisław Musielak ◽

Ryszard Borówka

Keyword(s):

Coastal Lagoons ◽

River Mouth ◽

Mouth Area ◽

Point Of View ◽

River Mouth Area ◽

Open Sea ◽

Odra River ◽

Flow Through ◽

The Baltic ◽

Shallow Water Body

Why should the Odra River mouth area not be regarded as an estuary? A geologist's point of viewThe authors find no arguments that would justify application of the term "estuary" to the area of the Odra River discharge into the Baltic Sea. The physiography, geology, and hydrology of the Odra river mouth show that the area possesses many more characteristics typical of flow-through coastal lagoons than those of estuaries. Of key importance in this respect is the Szczecin Lagoon, an extensive, shallow water body separated from the open sea by a barrier intersected by three narrow and long straits. The lagoonal nature of the area is demonstrated also by its geological history.

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BEHAVIOR AND ECOLOGY OF SPELEONECTES EPILIMNIUS (REMIPEDIA, SPELEONECTIDAE) FROM SURFACE WATER OF AN ANCHIALINE CAVE ON SAN SALVADOR ISLAND, BAHAMAS

Crustaceana ◽

10.1163/156854099503889 ◽

1999 ◽

Vol 72 (8) ◽

pp. 979-991 ◽

Cited By ~ 15

Author(s):

Jerry Carpenter

Keyword(s):

Surface Water ◽

Mouth Area ◽

The Body ◽

San Salvador ◽

San Salvador Island ◽

Cave Habitat ◽

Trunk Segments

Abstract Speleonectes epilimnius (described earlier in this issue), was observed at the surface of cave pools and in the laboratory. This unique cave habitat for remipedes is described. Videotapes of six live specimens shot under a microscope provided the only detailed observations to date for feeding, grooming, and resting behaviors for remipedes. During feeding, maxillae 1 and 2 held food tightly while repeatedly piercing, scratching, and rotating it; they periodically moved food to the mandibles, which rapidly chewed off tissue in typical crustacean fashion. Peristalsis moved food throughout the midgut and to diverticula of trunk segments, but not to the anal segment. Several structures were used in grooming. Antenna 1 was groomed by power strokes of anterior swimming appendages. Antenna 2 and frontal filaments groomed each other. Maxillae 1-2 and maxillipeds groomed the mouth area, posterior third of the body, and each other. Speleonectes epilimnius (decrit precedemment dans ce fascicule), a ete observe dans une grotte a la surface des bassins d'eau souterraines et au laboratoire. Cet habitat de grotte, unique pour les remipedes est decrit. Les enregistrements videos, realises au microscope sur six specimens vivants ont fourni les seules observations detailees a ce jour sur les comportements d'alimentation, de toilettage et de repos chez les remipedes. Au cours de la prise de nourriture, les maxilles 1 et 2 maintiennent la nourriture fermement pendant qu'elle est percee, grattee, retournee; elles portent periodiquement la nourriture aux mandibules qui rapidement mastiquent les tissus d'une facon typique chez les crustaces. Des mouvements peristaltiques font avancer la nourriture a travers l'intestin moyen et vers les diverticules des segments du tronc, mais pas jusqu'au segment anal. Plusieurs structures sont utilisees pour le toilettage. L'antennule est nettoyee grace a de puissants coups des appendices natatoires anterieurs. L'antenne et les filaments frontaux se nettoient les uns les autres. Les premieres et deuxiemes maxilles et les maxillipedes nettoient la region buccale, le tiers posterieur du corps et egalement se nettoient reciproquement.

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