172,815 research outputs found
Photograph of Bernard Ridley Walker, Hobart, c.1886
No full textPhotograph of Bernard Ridley Walker, Hobart, c.1886
Rescue operations and rehabilitation carried out on three Olive Ridley turtles from Mumbai, Maharashtra, India
No full textSea turtles are found all along the coast of India,
including the Lakshadweep and Andaman &
Nicobar Islands. Five species inhabit the Indian
seas; Dermochelys coriacea (leatherback turtle),
Eretmochelys imbricata (hawksbill turtle), Chelonia
mydas (green turtle), Lepidochelys olivacea (olive
ridley turtle) and Caretta caretta (loggerhead turtle)
(Rajagopalan et al., 1996). These five species of sea
turtles, distributed widely all over the world, are
highly endangered (Chhapgar, 2005). There are four
listed species of sea turtles that occur in
Maharashtra, India; hawksbill turtle, green turtle,
loggerhead turtle and olive ridley turtle (Daniel,
1983; Bhaskar, 1984; Das, 1985). Giri (2001) has
made a detailed survey of the various species of sea
turtles found in Maharashtra. Katkar (1991) has
reported nesting site of olive ridley observed on the
beach of Palshet, Ratnagiri, Maharashtra. Green and
olive ridley turtles are known to nest along parts of
the coast of Maharashtra such as Alibag, Dahanu,
etc., and in Ratnagiri (Gole, 1997; Kar & Bhaskar,
1981; Shaikh, 1984; Giri & Chaturvedi, 2006). In
Mumbai they usually nest at Backbay, Juhu
Chowpati, Girgoan Chowpati, Governor’s Gate,
Shivaji Park to Mahim, Juhu to Versova Mud
Island, Gorai, Marve, Manori, Worli and Vashi
Creek (Chhapghar, 2005; Kar & Bhaskar, 1981;
Giri & Chaturvedi, 2006)
[Letter to Honorable B. Ridley, 16 February 1858]
No full textLetter to Honorable B. Ridley from Clement C. Rains
Higher temperatures shorten inter-nesting periods in olive ridley turtles
No full text7 pages, 9 figures, 2 tables, supplementary data https://doi.org/10.1016/j.jtherbio.2025.104249.-- Data availability: The data was included as Supplementary Material https://doi.org/10.20350/digitalCSIC/17568Climate change is impacting sea turtles worldwide with the effects varying between species and populations. For example, rising temperatures have variable effects on the duration of the inter-nesting period (IP)—the time between two consecutive nests during a single nesting season. Specifically, a negative correlation between water temperature and IP has been reported in green (Chelonia mydas), hawksbill (Eretmochelys imbricata), and loggerhead (Caretta caretta) turtles. In contrast, previous studies have shown no correlation for olive ridley turtles (Lepidochelys olivacea). Here, we assessed whether this lack of a correlation in olive ridley turtles was a product of the small sample size used in previous studies (nmax = 11). We used capture-mark-recapture data over 14 years to calculate the IP of olive ridley turtles (n = 96) nesting on two different beaches in Costa Rica. Next, we calculated mean sea surface temperature (SST) during each IP within estimated inter-nesting areas (225 km2), as inferred from previous olive ridley telemetry studies, and using data from NASA's multi-scale ultra-high-resolution sensor. Mean (±SD) IP was 22.5 ± 6.0 d (range: 13–41 d) and mean SST was 28.0 ± 0.6 °C (range: 26.1–29.5 °C). We observed a statistically significant negative relationship between SST and IP suggesting that elevated temperatures at inter-nesting habitats influence the phenology of olive ridley turtles as previously observed in other hard-shelled sea turtle species. Thus, we postulate that elevated temperatures due to climate change may influence the timing of nesting seasons for solitary nesting olive ridley turtles and may even alter timing of the olive ridley mass nesting aggregations known as arribadasFunding over the years was provided by the Earthwatch Institute, the Schrey Distinguished Professorship of Purdue University Fort Wayne, the Betz Chair Endowment of Drexel University, the AZA Sea Turtle SAFE Program, Virginia Aquarium Camp; Marine Science Center, North Carolina Aquariums, South Carolina Aquarium, the Florida Aquarium and The Leatherback Trust. NJR was funded by the Spanish government (AEI) through the Ramon y Cajal postdoctoral program (#RYC2021-034381-I). Support to ICM was provided via the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S) and funded by the Agencia Estatal de Investigación (AEI) 10.13039/501100011033Peer reviewe
Global phylogeography of ridley sea turtles (Lepidochelys spp.):evolution, demography, connectivity, and conservation
No full textGlobally distributed marine taxa are well suited for investigations of biogeographic impacts on genetic diversity, connectivity, and population demography. The sea turtle genus Lepidochelys includes the wide-ranging and abundant olive ridley (L. olivacea), and the geographically restricted and ‘Critically Endangered’ Kemp’s ridley (L. kempii). To investigate their historical biogeography, we analyzed a large dataset of mitochondrial DNA (mtDNA) sequences from olive (n = 943) and Kemp’s (n = 287) ridleys, and genotyped 15 nuclear microsatellite loci in a global sample of olive ridleys (n = 285). We found that the ridley species split ~ 7.5 million years ago, before the Panama Isthmus closure. The most ancient mitochondrial olive ridley lineage, located in the Indian Ocean, was dated to ~ 2.2 Mya. Both mitochondrial and nuclear markers revealed significant structure for olive ridleys between Atlantic (ATL), East Pacific (EP), and Indo-West Pacific (IWP) areas. However, the divergence of mtDNA clades was very recent (< 1 Mya) with low within- clade diversity, supporting a recurrent extinction-recolonization model for these ocean regions. All data showed that ATL and IWP groups were more closely related than those in the EP, with mtDNA data supporting recent recolonization of the ATL from the IWP. Individual olive ridley dispersal between the ATL, EP, and IN/IWP could be interpreted as more male- than female-biased, and genetic diversity was lowest in the Atlantic Ocean. All populations showed signs of recent expansion, and estimated time frames were concordant with their recent colonization history. Investigating species abundance and distribution changes over time is central to evolutionary biology, and this study provides a historical biogeographic context for marine vertebrate conservation and management.</p
Maurice Ridley, head-and-shoulders portrait
No full textMaurice Ridley-BSEE 1904. On frame: C.B. Hinea, Lafayette, Ind
Nietzsche on art as the good will to appearance
No full textNietzsche makes a number of remarks that suggest that he thinks that art and truth are antithetical – indeed that he thinks that the value of art lies in its falsification of aspects of the world that would otherwise prove unbearable. ‘Truth is ugly,’ he says: ‘We possess art lest we perish of the truth.’ But the argument of the present paper is that the falsification reading is unsustainable, and that if we attend to the notion of ‘appearance’ rather more attentively than Nietzsche himself always did, we can (a) read him as defending a plausible account of the relation between art and truth, rather than an unsustainable one, (b) recast the passages that have encouraged the falsification reading so that they lend support to the reading suggested here, and (c) show how the resultant account squares with, and indeed reinforces, Nietzsche's perspectivism.</p
Damiria Schmidti Ridley.
No full textDamiria Schmidti Ridley. 1884. Crella Schmidti, Ridley (19, p. 432). 189o. Damiria australiensis, Dendy (10, p. 28). On sait (30, p. 102) que le genre Crïbrella a été créé par 0. Schmidt pour l'espèce G. hamigera, dont Gray fit, par la suite, le genre Hamigera, le nom de Crïbrella ayant déjà été employé pour désigner une Astérie. Une autre Éponge rattachée par Schmidt à son genre Crïbrella, C. elegans, devint pour Gray, désireux d'éviter ce double emploi, Crella elegans; mais le genre Crella Gray reçut une définition quelconque, applicable à beaucoup d'Épongés de groupes divers. J'ai fait rentrer (30) dans un genre naturel, genre Yvesia, Crella elegans, avec un certain nombre d'autres Éponges dispersées, malgré leurs affinités, dans les genres Grayella, Cometella, Halichondria, Myxïlla, Sclerilla (Hansen), le tout caractérisé par les mégasclères de l'ectosome toujours épineux et par ceux du choanosome toujours lisses et normalement diactinaux. La Crella Schmidti de Ridley n'a aucun rapport avec l'ancienne Crella elegans (Schm.) Gray, ni, en général, avec les Yvesia. Pour mieux montrer encore, si c'est nécessaire, combien il était difficile de savoir ce qu'on devait entendre par Crihrella ou Crella, je ferai remarquer en passant que ce que Keller a appelé Crihrella labiata n'est autre chose que la forme massive de Cliona viridis (Papillina nigricans Schm. et Osculina polystomella Schm.). Crella Schmidti doit rentrer dans le genre Damiria Keller. Elle a d'ailleurs été déjà mise à sa place par Dendy, car Damiria australiensis Dendy est, si je ne me trompe, synonyme de Crella Schmidti Ridley. Damiria Schmidti (Ridley) est représentée dans la collection d'Amboine par un spécimen fragmenté, à digitations hautes de 25 mm., semblables à celles de Tedania digitata. Il est plus conforme à la description que fait Dendy de Damiria australiensis qu'à celle de Crella Schmidti. Ses oxes sont cependant plus épais, 200 a sur 12; ses tylotes restent, en revanche, un peu plus courts, 200 u sur 5; il possède des isochèles et des sigmates très abondants, mais ces derniers ne dépassent guère 15 u, tandis que les isochèles atteignent couramment 40 a. Des variations aussi légères s'observent également sur les spicules du type décrit par Ridley; elles sont tout individuelles^ comme celles qu'on est à même de relever à chaque instant sur les Dendoricines de nos côtes. Distribution. Port- Jackson; Port-Phillip Heads; Amboine.Published as part of Topsent, Émile, 1896, Spongiaires de la baie d'Amboine. (Voyage de MM. M. Bedot et C. Pictet dans l'archipel Malais.), pp. 421-487 in Revue Suisse de Zoologie 4 (3) on pages 455-456, DOI: 10.5962/bhl.part.3550
Gelliodes fibulata Ridley.
No full textGelliodes fibulata Ridley. Plusieurs beaux spécimens, dans l'alcool ou desséchés. Distribution. Détroit de Torrès; détroit de Bass?; Amboine.Published as part of Topsent, Émile, 1896, Spongiaires de la baie d'Amboine. (Voyage de MM. M. Bedot et C. Pictet dans l'archipel Malais.), pp. 421-487 in Revue Suisse de Zoologie 4 (3) on page 470, DOI: 10.5962/bhl.part.3550
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