Influence of Availability on the Feeding Habits of the Common Garter Snake

Copeia ◽  
1945 ◽  
Vol 1945 (3) ◽  
pp. 159 ◽  
Author(s):  
Karl F. Lagler ◽  
J. Clark Salyer
Keyword(s):  
Feeding Habits ◽  
Garter Snake ◽  
The Common

Diet of common dolphinfish (Coryphaena hippurus) in the Pacific coast of Ecuador

2016 ◽  
Vol 97 (1) ◽  
pp. 207-213 ◽  
Author(s):  
José Luis Varela ◽  
Cristhian Ronald Lucas-Pilozo ◽  
Manuel María González-Duarte
Keyword(s):  
Pacific Coast ◽  
Feeding Habits ◽  
Dosidicus Gigas ◽  
Invertebrate Species ◽  
Coryphaena Hippurus ◽  
Important Prey ◽  
The Pacific ◽  
The Common ◽  
Hippocampus Hippocampus ◽  
High Degree

The diet and the feeding habits of the common dolphinfish (Coryphaena hippurus) in the Pacific coast of Ecuador was assessed by examining 320 stomachs of individuals ranging from 51 to 149 cm in total length. Fish was the predominant prey group in the diet (Alimentary Index, %AI = 95.39) followed by cephalopods (%AI = 4.13) and crustaceans (%AI = 0.48). Among the 17 prey items that make up the dolphinfish diet, the Exocoetidae family was the most important prey (%AI = 57.13), Dosidicus gigas being the most abundant invertebrate species (%AI = 7.65). Feeding patterns were evaluated using the graphing method of Amundsen, which suggested that this species shows a varying degree of specialization on different prey taxa. Thus, while some species were unimportant and rare (Hippocampus hippocampus, Lagocephalus lagocephalus, Gobiidae and Argonauta sp.), several dolphinfishes showed a high degree of specialization on Scombridae, Pleuroncodes planipes, Portunus xantusii and Opisthonema libertate. Size-related and temporal shifts in dietary composition were investigated by PERMANOVA analysis, which showed wide variations among size classes and periods of capture. The results of this study indicate that the common dolphinfish is an opportunistic feeder, which is capable of consuming a wide variety of schooling epipelagic organisms.

Feeding habits of the common genet (Genetta genetta) in the area of Djurdjura, north of Algeria

Mammalia ◽  
2014 ◽  
Vol 78 (1) ◽  
Author(s):  
Mansour Amroun ◽  
Messaoud Bensidhoum ◽  
Pierre Delattre ◽  
Philippe Gaubert
Keyword(s):  
Feeding Habits ◽  
Genetta Genetta ◽  
The Common

scholarly journals Neurotoxin localization to ectodermal gland cells uncovers an alternative mechanism of venom delivery in sea anemones

2011 ◽  
Vol 279 (1732) ◽  
pp. 1351-1358 ◽  
Author(s):  
Yehu Moran ◽  
Grigory Genikhovich ◽  
Dalia Gordon ◽  
Stefanie Wienkoop ◽  
Claudia Zenkert ◽  
...  
Keyword(s):  
Sea Water ◽  
Feeding Habits ◽  
Common Species ◽  
Sea Anemone ◽  
Alternative Mechanism ◽  
Type I ◽  
Sea Anemones ◽  
Common View ◽  
Gland Cells ◽  
The Common

Jellyfish, hydras, corals and sea anemones (phylum Cnidaria) are known for their venomous stinging cells, nematocytes, used for prey and defence. Here we show, however, that the potent Type I neurotoxin of the sea anemone Nematostella vectensis , Nv1, is confined to ectodermal gland cells rather than nematocytes. We demonstrate massive Nv1 secretion upon encounter with a crustacean prey. Concomitant discharge of nematocysts probably pierces the prey, expediting toxin penetration. Toxin efficiency in sea water is further demonstrated by the rapid paralysis of fish or crustacean larvae upon application of recombinant Nv1 into their medium. Analysis of other anemone species reveals that in Anthopleura elegantissima , Type I neurotoxins also appear in gland cells, whereas in the common species Anemonia viridis , Type I toxins are localized to both nematocytes and ectodermal gland cells. The nematocyte-based and gland cell-based envenomation mechanisms may reflect substantial differences in the ecology and feeding habits of sea anemone species. Overall, the immunolocalization of neurotoxins to gland cells changes the common view in the literature that sea anemone neurotoxins are produced and delivered only by stinging nematocytes, and raises the possibility that this toxin-secretion mechanism is an ancestral evolutionary state of the venom delivery machinery in sea anemones.

Predation on fish and intersite variation in the diet of common garter snakes, Thamnophis sirtalis, on Vancouver Island

1991 ◽  
Vol 69 (4) ◽  
pp. 988-994 ◽  
Author(s):  
Patrick T. Gregory ◽  
Kari J. Nelson
Keyword(s):  
Temporal Variation ◽  
Body Mass ◽  
Vancouver Island ◽  
Garter Snake ◽  
Prey Abundance ◽  
Thamnophis Sirtalis ◽  
Garter Snakes ◽  
Site Specific ◽  
The Common

Diets of garter snakes (Thamnophis) often vary in space or time in response to variations in prey abundance. We compared the diet of the common garter snake (T. sirtalis) on Vancouver Island at fish-rearing facilities (hatcheries) and at nearby natural sites where fish were present but less abundant. Snakes of all sizes fed on fish at hatcheries, but fish were rarely eaten at natural sites, where amphibians or earthworms were the major prey types. Any particular characterization of the diet of this species therefore must be site specific. Although snakes exhibited intersite variation in diet, there was no evidence of temporal variation in diet at any site. The proportion of snakes with food in their stomachs varied among sites (perhaps indicating differences in frequency of feeding among sites) and was correlated with mean relative body mass of snakes. This suggests that some sites are more productive than others for snakes, but rigorous tests of whether snake populations are food-limited have not been done.

scholarly journals Reproductive biology and feeding habits of the common dolphinfish Coryphaena hippurus (Linnaeus, 1758) off Saurashtra coast, India

2018 ◽  
Vol 65 (4) ◽  
Author(s):  
Jyoti Saroj ◽  
K. Mohammed Koya ◽  
K.L. Mathew ◽  
Panja Tehseen
Keyword(s):  
Reproductive Biology ◽  
Feeding Habits ◽  
Fork Length ◽  
Reproductive Activity ◽  
Monthly Basis ◽  
Coryphaena Hippurus ◽  
Saurashtra Coast ◽  
The Common ◽  
One Year ◽  
The One

The present study analysed reproductive biology and feeding habits of the common dolphinfish Corphaena hippurus, along the Saurashtra coast of India. The study is based on an investigation of 295 specimens caught using drift gillnet at Veraval. The samples were collected on a monthly basis between March 2015 and February 2016. The sex ratio was 1:1.75 with a significant dominance of females in the population. The size at maturity for females was 593 mm FL (fork length). Absolute fecundity of the individuals ranged from 1,07,813 to 15,50,400 having ova diameter range of 0.3-1.96 mm. C. hippurus spawned throughout the year with its reproductive activity peaking in April and December. Thus the dolphin fish has an extended spawning season; during which it laid eggs almost continuously. A total of 128 stomachs of C. hippurus, whose fork length FL ranged from 380 to 1250 mm were examined during the one year period of this study. Tunas were found to be the common dietary component of the dolphinfish.

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