{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T02:30:51Z","timestamp":1790908251416,"version":"4.1.0"},"reference-count":37,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,2,6]],"date-time":"2005-02-06T00:00:00Z","timestamp":1107648000000},"content-version":"vor","delay-in-days":5760,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[1989,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Adult male marbled newts (<jats:italic>Triturus marmoratus<\/jats:italic>) were collected at the beginning of the spermatogenetic period and exposed to different photoperiods (natural photoperiod with progressively increasing daylengths, total darkness, 8L:16D, 12L:12D, 16L:8D, and continuous light) for 3 months at 20\u00b0C. To evaluate the effect of photoperiodic input via pineal gland photoreceptors, two additional groups of newts were blinded by a non\u2010aggressive method (an elastic rubber cap was adjusted to the head to cover the eyes but not the pineal photoreceptors). These animals were exposed either to the natural photoperiod or to 12 hr of light per day. Quantitative histologic studies on testicular development and germ\u2010cell volume revealed no significant differences between non\u2010blinded and blinded animals. Testicular size and germ\u2010cell development increased in the following order: total darkness, constant light, 8L:12D, natural photoperiod, 12L:12D, and 16L:8D. These results suggest that (1) long photoperiods enhance testicular development, whereas short photoperiods or an environment of continuous light have the opposite effects and (2) the effect of photoperiods on testicular function in newts is independent of the ocular photoreceptors.<\/jats:p>","DOI":"10.1002\/jmor.1052000205","type":"journal-article","created":{"date-parts":[[2005,2,24]],"date-time":"2005-02-24T15:55:03Z","timestamp":1109260503000},"page":"151-162","source":"Crossref","is-referenced-by-count":10,"title":["Effect of photoperiod on testicular function in blinded and non\u2010blinded marbled newts, <i>Triturus marmoratus<\/i> (caudata, salamandridae)"],"prefix":"10.1002","volume":"200","author":[{"given":"Benito","family":"Fraile","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ricardo","family":"Paniagua","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina C.","family":"Rodriguez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco Jos\u00e9","family":"Saez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,2,6]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"1","volume-title":"The Pineal Gland","author":"Ariens\u2010Kappers J.","year":"1981"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0300-9629(87)90399-9"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1677\/joe.0.0960085"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-6480(82)90087-9"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1051\/rnd:19810704"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod33.1.21"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1210\/endo-111-3-863"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1086\/physzool.59.6.30158617"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/jez.1402270314"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-6395.1982.tb00761.x"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-6480(82)90184-8"},{"key":"e_1_2_1_13_1","first-page":"2339","article-title":"Circadian rhythms and photoperiodic time measurements in mammals","volume":"35","author":"Elliot J. 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