Term
|
Definition
| prey detection; navigation; communication |
|
|
Term
| electric fields generated by electrocytes |
|
Definition
| make up much body musculature; electrocytes disc-shaped and staked in columns; |
|
|
Term
|
Definition
| modified muscles cells produce electric fields |
|
|
Term
|
Definition
| stimulation causes depolarization of cells, small electric current, stack of cells functions like batteries in series |
|
|
Term
| electric field production by fish: strong electric fields |
|
Definition
| strong electric fields generates by Electrical Organ Discharge(EOD); only for defense, stunning prey; torpedo rays, electric catfish, electric eel |
|
|
Term
| electric field production by fish: weak electric fields |
|
Definition
| generated by EOD; requires intricate coordination-enlarged portion of cerebellum(metencephalon);measure in millivolts/cm;used for communicatoin, prey detection |
|
|
Term
|
Definition
| eod signals species-specific |
|
|
Term
|
Definition
| signal species, sex, size, maturation state, location, distance, individual recognition, courtship dominance, warning |
|
|
Term
|
Definition
| modify pulse frequency, voltage, field shape as part of vocabulary for communication |
|
|
Term
| eod communication used by |
|
Definition
| mormyrids, gymnotids, siluriformes, rajidae (skates, chondrichthyes) |
|
|
Term
|
Definition
| detect distortion of self-induced field from normal body functions (not eod) by moving through another electromahgnetic field, including earths: chondrichthyes |
|
|
Term
|
Definition
| detect by slight movement of magnetit crystal in skull against hair cells: analogus to otolith function, some Osteichthyes |
|
|
Term
|
Definition
| detect electromagnetic field produced by prey; extremely sensitive; detect prey distortion of self-induced field from eod |
|
|
Term
|
Definition
| detect only high freq and low voltage ac fields; in fishes that produce EOD (knife fishes, elephantfishes) |
|
|
Term
| sensory organs used in electroreception |
|
Definition
| tuberous organs, ampullary organs |
|
|
Term
|
Definition
| gel filled canal(conductive);detect loq freq ac or dc fields;ampullae of lorenzini in chondrichthyes, lunfish, sturgeons;pit organs in some teleosts |
|
|
Term
| examples of electroreception |
|
Definition
| mormyrid electroreception; kalmijn experiment |
|
|
