#ichthyofauna

[psalidodont]

plenty of sea in the fish or some shit like that idfk

[oaresearchpaper]

Diversity of Gobies (Actinopterygii, Gobiiformes) in the Rupnarayan River, West Bengal, India

Abstract

A total of 16 species under 13 genera in 4 families of Gobiiformes have been recorded from the Rupnarayan river. Of these Bostrychus sinensis is being reported for the first time from Indian mainland and Bathygobius ostreicola is being recorded for the first time from West Bengal. Four species viz., Acentrogobius viridipunctatus, Butis butis, Taenoides buchanani and Taenioides cirratus are being reported for the first time from Purba Medinipur district and 14 species viz., Acentrogobius viridipunctatus, Apocryptes bato, Bathygobius ostreicola, Boleophthalmus boddarti, Bostrychus sinensis, Butis butis, Butis koilomatodon, Eleotris fusca, Eleotris melanosoma, Odontamblyopus rubicundus, Periophthalmus modestus, Pseudapocryptes elongatus, Taenoides buchanani and Taenioides cirratus are being reported for the first time from Rupnarayan river. Periopthalmus weberi appears to have gone locally extinct in this River.

Introduction

Gobiiformes, the gobies and their relatives, is one of the world's most varied vertebrate lineages with over 2200 species distributed under more than 200 genera (Nelson et al., 2016). Gobies are found in tropical and subtropical waters, especially on coral reefs and estuaries and only 10% of which are found in freshwater (Helfman et al., 2009). Although some species are consumed by man mostly these are prey of economically valuable fish species. Some species are also valuable as ornamental fish (Patzner et al., 2012). Chatterjee and Mishra (2012) reported 174 gobioid species under 69 genera from India of which 45 species under 37 genera are found in Sundarbans of West Bengal (Chatterjee et al., 2013) and 23 species have been recorded so far from Purba Medinipur district (Jayram, 1981; Chatterjee et al., 2000; Yennawar et al., 2015, 2017; Payra et al., 2018; Hossain et al., 2019; Pahari et al., 2020; Khan and Mandal, 2024). Yennawar et al. (2017) and Chatterjee et al. (2000) recorded 14 and 9 species of gobies respectively from the coastal region of Digha, Purba Medinipur district, whereas, Payra et al. (2018) and Khan and Mandal (2024) each have reported 4 species of gobies from Egra and Ramnagar of this district. While Hossin et al. (2019) recorded Butis koilomatodon from Sankarpur, Sit et al. (2020) recorded Glossogobius giuris and Stigmatogobius sadanundio from Purba Medinipur district. River Rupnarayan, however, has remained rather unexplored in this regard. Gobiids recorded so far from this river are Periopthalmus weberi, G. guiris and S. sadanundio as reported by Jayram (1981), Ghorai (2018) and Pahari et al. (2020) respectively. Under such backdrop the present study on the diversity of order Gobiiformes of the Rupnarayan River, which constitutes the eastern border of Purba Medinipur district, was under taken.

Source : Diversity of Gobies (Actinopterygii, Gobiiformes) in the Rupnarayan River, West Bengal, India | InformativeBD

[greenfrog04]

Taylor & Francis publications 27th July 2023- 1st August 2023

There have been a lot of interesting documents released between 27th July-1st August on the Taylor & Francis website; i decided to include the released papers' doi here.

Feel free to read them if you are interested, i have marked the papers available free to read and the others that require payment. (open access = Blue, payment required = red)

Copy the doi link or title into your search engine and you should be brought to the document.

A new amphibamiform (Temnospondyli: Branchiosauridae) from the lower Permian of the Czech Boskovice Basin

doi.org/10.1080/02724634.2023.2231994

A fossil viper (Serpentes: Viperidae) from the Early Pleistocene of the Crimean Peninsula

doi.org/10.1080/08912963.2023.2241059

Unusual cystoporate? bryozoan from the Upper Ordovician of Siljan District, Dalarna, central Sweden

doi.org/10.1080/11035897.2023.2223579

Early Devonian Ostracoda from the Norton Gully Sandstone, southeastern Australia

doi.org/10.1080/03115518.2023.2223658

Eocene Araucariaceae in Europe: additional evidence from a new Baltic amber species of the genus Oxycraspedus Kuschel, 1955 (Coleoptera: Belidae)

doi.org/10.1080/08912963.2023.2237984

Skeletal taphonomy of the water frogs (Amphibia: Anura) from the Pit 7/8 of the Pliocene Camp dels Ninots site (Caldes de Malavella, NE Spain)

doi.org/10.1080/08912963.2023.2237998

Tapejarine pterosaur from the late Albian Paw Paw Formation of Texas, USA, with extensive feeding traces of multiple scavengers

doi.org/10.1080/08912963.2023.2241044

The first American occurrence of Phoenicopteridae fossil egg and its palaeobiogeographical and palaeoenvironmental implications

doi.org/10.1080/08912963.2023.2241050

Eocene (Ypresian-Lutetian) mammals from Cerro Pan de Azúcar (Gaiman, Chubut Province, Argentina)

doi.org/10.1080/08912963.2023.2241054

Turtle tracks from the middle Jurassic Yaopo formation in Beijing, China

doi.org/10.1080/08912963.2023.2241064

The earliest occurrence of Equus in South Asia

doi.org/10.1080/02724634.2023.2227236

Early Cretaceous radiation of teleosts recorded by the otolith-based ichthyofauna from the Valanginian of Wąwał, central Poland

doi.org/10.1080/02724634.2023.2232008

A stem therian mammal from the Lower Cretaceous of Germany

doi.org/10.1080/02724634.2023.2224848

Vertebrate ichnology and palaeoenvironmental associations of Alaska’s largest known dinosaur tracksite in the Cretaceous Cantwell Formation (Maastrichtian) of Denali National Park and Preserve

doi.org/10.1080/08912963.2023.2221267

Biostratigraphical and paleoenvironmental studies of some Miocene‒Pliocene successions in Northwestern Nile Delta, Egypt

doi.org/10.1080/08912963.2023.2231978

Hyena and ‘false’ sabre-toothed cat coprolites from the late Middle Miocene of south-eastern Austria

doi.org/10.1080/08912963.2023.2237979

Source:

[thruoutin]

朋友AWE_LL写的音乐小博客。他里面讨论了一些关于我一首歌叫Ichthyofauna。可以看一下。🐬

https://www.xiaoyuzhoufm.com/episode/642293008aca9099d7843c45

[mbimphblog]

ICHTHYOFAUNAL DIVERSITY OF KINNERASANI RESERVOIR IN BHADRADRI KOTHAGUDEM DISTRICT OF TELANGANA, INDIA |  UTTAR PRADESH JOURNAL OF ZOOLOGY

In this study, the Ichthyofaunal diversity of the Kinnerasani reservoir in Telangana state was discovered. Sixty-one fish species were discovered, divided into eight orders, 19 families, and 40 genera. The order Cypriniformes dominated with 24 species, accounting for 39.34% of all species, followed by Perciformes with 14 (22.95%), Siluriformes with 13 (21.31%), Channiformes with 04 (6.55%), Beloniformes and Anguilliformes with 02 (3.27%), Osteoglossiformes and Cyprinodontiformes with 01 species each (1.64 percent ). Perciformes supplied 06 (31.57 percent) of the 19 families listed, while Siluriformes gave 05. (26.31 percent ). The current communication presents fish species baseline data as well as diversity indexes and conservation status. Please see the link :- http://mbimph.com/index.php/UPJOZ/article/view/2575

[innspubnet]

Analysis of trophic gradient through environ-mental filter influencing fish assemblage structure of the river Teesta in Eastern Himalayas - JBES

Analysis of trophic gradient through environ-mental filter influencing fish assemblage structure of the river Teesta in Eastern Himalayas – JBES

Munmun Chakrabarty, Sumit Homechaudhuri

Aquatic Bioresource Research Laboratory, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata-700019, India

Key words: Hill-stream, ichthyofauna, dietary composition, feeding guild, niche filter.

Abstract

Factors controlling biodiversity and co-existence of species need immediate attention to maintain biodiversity.…

[ijtsrd]

Studies on Diversity and Seasonal Variations in Ichthyofauna of Chandrasarovar Pond of Jhalawar Rajasthan

by Rajasthan Arjumand Qureshi "Studies on Diversity and Seasonal Variations in Ichthyofauna of Chandrasarovar Pond of Jhalawar (Rajasthan)"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021,

URL: https://www.ijtsrd.compapers/ijtsrd43619.pdf

Paper URL: https://www.ijtsrd.combiological-science/zoology/43619/studies-on-diversity-and-seasonal-variations-in-ichthyofauna-of-chandrasarovar-pond-of-jhalawar-rajasthan/arjumand-qureshi

peerreviewedjournals, reviewpapers, callforpaperhealthscience

The present study deals with ichthyofaunal diversity of Chandrasarovar pond of Jhalawar, Rajasthan. Total 23 species from 6 orders, 10 families and 19 genera were recorded during the present study. The range of water parameters such as temperature, pH, dissolved oxygen alkalinity and hardness were recorded and found suitable for fish production. Dominant family Cyprinidae with 12 species and 08 genera followed by Bagridae with 03 species 02 genera and other all families Claridea, Heteropneustidae, Cichilidae, Channidae, Gobiidae, Belonidae, Mastacembelidae, Poecilidae and Anguilidae contributed single species with single genera. Regarding conservation status out of 23 fish species 21 species least concern and 2 species near threaten. During month of December post monsoon highest fish diversity was found. Seasonal diversity indices such as Shannon Wiener species diversity, Pielou’s evenness, Margalef’s species richness, were calculated based on the abundance of fish species to access the ecosystem health of Chandrasarovar pond of Jhalawar. These studies will be help for the maintenance and regulation of Ichthyofauna and other aquatic ecosystem of the Chandrasarovar pond of Jhalawar, 

[brilmans]

Een brasem uit het bos

Visresten in het bos

In de vroege lentemaanden struin ik graag door ons polderbos. In die maanden is de ondergroei namelijk nog dusdanig pril dat je de bodem kun zien. En op die bodem vind je soms de interessantste dingen. Zo vond ik onlangs nog een bunzingkaak, een schedel van een grote bonte specht en, heel opmerkelijk zo midden in het bos, een bijna compleet geraamte van een vis van formaat.

Terwijl ik de visresten in een plastic zak schraapte vroeg ik mij twee dingen af. Ten eerste: hoe kwam die vis daar?  En ten tweede: van welke vis waren deze resten? Naar het antwoord op de eerste vraag kon ik slechts gissen -wie weet een lompe reiger die zijn buit had laten vallen- het antwoord op de tweede vraag viel te achterhalen. Dat zocht ik uit.

Determineren

Al sinds mijn kinderjaren ben ik gebiologeerd door het leven in de sloot. Bijgevolg ken ik letterlijk onze hele inheemse ichthyofauna uit mijn hoofd. Het was dan ook een koud kunstje, het formaat en de vorm van de kop spraken boekdelen, om vast te stellen dat het een grote karperachtige betrof. En bij ons in de polder ligt karper, zeelt of brasem dan het meest voor de hand.

Voor de hand liggen, telt alleen niet in de wetenschap. Daar heb je niets aan. Je moet zeker weten. En voor die zekerheid heb je bewijs nodig. En bij karperachtigen is het faryngeale kaakapparaat daar het meest geschikt voor. De vorm van het kaakapparaat en de bijbehorende tanden zijn namelijk uitermate geschikt voor determinatie. Ik mocht dus van geluk spreken dat er nog een faryngeale kaak in geraamte aanwezig was: ik had bewijs!

De visresten zijn zonder twijfel van een brasem. Daar laat de faryngeale kaak geen twijfel over bestaan. Bovendien komen het cleitrum, het preopercular en opercular sprekend overeen met die van een brasem. De resten gaan dus de collectie in als: brasem (Abramis brama, Linnaeus, 1758).

Vergelijkingsmateriaal

Een gedetermineerd skelet is uitermate geschikt als vergelijkingsmateriaal. Je kunt namelijk alle onderdelen heel makkelijk naast ander vondsten leggen. En vind je overeenkomende stukken, dan kun je die voorzien van naam. Tenminste als de skeletelementen genoeg soortspecifiek zijn. Weet je niet zeker of dat zo is, dan raad ik aan cf. voor de naam te plaatsen dat zo iets betekend als 'lijkt sterk op'.

Zelf heb ik aan de hand van het skelet twee fossiele vinstekels en een fossiele viswervel afkomstig van de Zandmotor kunnen determineren als lijkt sterk op brasem. Alles komt namelijk overeen. Qua morfologie en qua formaat. Zo vind ik op een dag een brasem in het bos en brasem op mijn zolder. Het moet niet gekker worden.

[karingudino]

Free Image, Art and Conservation in Cuba

A dedication to growth that respects the atmosphere

Girls participate in Libre Imagen from the roles of creators, managers, facilitators or employees. Picture: Taken from the Libre Imagen Fb web page

Within the Cuban province of Matanzas, a venture achieves its sustainability in concord with the atmosphere and utilizing invasive forest species such because the marabou.

HAVANA TIMES – The Libre Imagen (free picture), Artwork y Conservation workshop is an initiative that integrates the rules and practices of permaculture with artwork and well-liked schooling. It rescues the pure, historic and creative values ​​of the locality for the harmonious growth of the neighborhood.

The venture is situated 174 kilometers from Havana, in Batey Mario Lopez, Playa Larga, Cienaga de Zapata. It’s led by Susana Guevara Barrero, Visible Arts teacher, and Lazaro Ramon Sosa Morell, theater teacher.

Like many initiatives of this kind, Libre Imagen additionally struggled with the seek for a sustainable different. That’s how they started to hold out carpentry and handicraft work utilizing invasive wooden species. They promote work and engravings that join and re-signify pure, historic and creative values ​​of the realm.

Guevara Barrero says the primary aim of the venture is to assist develop the neighborhood, harmoniously built-in with the character of the Cienaga de Zapata Biosphere Reserve.

The kid was awarded within the “Yo cenaguero” Contest, organized by the Cienaga de Zapata Neighborhood Transformations venture, ECOVALOR Cienaga, and the Free Picture Workshop.

Our imaginative and prescient is to revitalize the appreciation and creation of native aesthetic values ​for historical past, nature and artwork. In follow we combine that imaginative and prescient and the aim within the work processes.

The carpentry and handicraft enterprise with woods of invasive and launched species, such because the marabou (Dichrostachys cinérea), the cayeput (Melaleuca leucadendron L.), the casuarina (Casuarina equisetifolia) and the yarúa, (Caesalpinia cubensis) display this work ”, explains Guevara.

Invasive forest species displace native native and endemic vegetation occupying their residing house. Earnings from carpentry and wooden crafts enable the venture to logistically maintain environmental schooling processes locally.

As caring for the atmosphere is essentially the most important side for the Libre Imagen group, methods are drawn as much as step by step change felled invasive timber with native species. To do that, they use strategies primarily based on the moral rules of permaculture. Caring for the land and other people, conserving the soil, forests and water, in addition to the honest distribution of pure assets.

Ties with the neighborhood

The hyperlink with the neighborhood happens by the venture’s exercise plan. Persons are built-in in workshops, as facilitators, listeners, managers, or employees. Along with offering job alternatives and coaching, Libre Imagen assumes duty to advertise feminine participation.

“Within the Ciénaga de Zapata coexists a kind of affiliation of men and women of science, biologists, chicken watchers, geographers, ichthyofauna specialists, botanists, artists and academics. For a few years they’ve carried out analysis work in several ecosystems. They facilitate and pave the way in which in the direction of a tradition of conservation and sustainable growth within the Cienaga de Zapata Biosphere Reserve,” notes Guevara.

The Cayeput Hostal enterprise, within the Ciénaga de Zapata, is essentially the most related expertise on the native degree within the administration of Melaleuca 1.

Among the many routine actions of Libre Imagen are the cleansing of the shoreline, gathering strong waste, making wall work, oil work and acrylic on canvas, pyrography, portray, drawing, workshops and talks.

The dynamics slowed down with the pandemic and now embrace the design and preparation of interpretive signage for trails created by the Firm for the Conservation of the Zapata Swamp (ECOCIENZAP). The venture turns a part of its promotional work to social networks, so as to unfold and promote nature conservation.

Just a little historical past

Free Picture, Artwork and Conservation emerged 14 years in the past on the Nicolas Guillen Batista Faculty of Artwork Instructors, in Camagüey, 540 kilometers from Havana. At the moment it didn’t go by this title.

In its beginnings it aspired to turn out to be a youngsters’s theater firm, with components of environmental schooling. Little by little, it targeted on the environmentalist strategy and the preparation of individuals from the neighborhood.

In the summertime of 2015, with the assistance of the Cienaga de Zapata Neighborhood Transformations venture, in collaboration with the Swiss NGO Zunzún and the headquarters of the Ministry of Science, Know-how and Surroundings (CITMA) for Matanzas, they participated in assortment of strong wastes on the coast.

They then developed coaching and educating of agroecological instruments to small teams of decorative plant growers and artisans within the area.

“We obtained coaching in permaculture, venture design and administration, biodiversity and conservation, invasive species administration, well-liked environmental schooling, strong waste administration, sustainable tourism and environmental interpretation for native guides,” says Lazaro Sosa Morell. He describes this second because the set off to evolve the idea and title that Libre Imagen it has in the present day.

Read more from Cuba here on Havana Times.

Source link

source https://fikiss.net/free-image-art-and-conservation-in-cuba/ Free Image, Art and Conservation in Cuba published first on https://fikiss.net/ from Karin Gudino https://karingudino.blogspot.com/2021/03/free-image-art-and-conservation-in-cuba.html

[evoldir]

Fwd: Postdoc: Portugal.MetaGenomics

Begin forwarded message: > From: evoldir@evol.biology.mcmaster.ca > Subject: Postdoc: Portugal.MetaGenomics > Date: 5 December 2019 at 07:48:52 GMT > To: rdmpage@gmail.com > > > We are currently accepting applications to fill a 24 months contract for a > PhD researcher under the project "ENVMETAGENOMICS “eDNA: from rare species > detection to whole-community diversity using high-throughput sequencing”. > > Preferred candidates must possess a PhD, 3 or more years of post-doctoral > experience, and: > > a)     Demonstrated scientific and/or professional experience in the area > of Bioinformatics or Comparative Genomics. > > b)    The candidate must also have experience in the analysis of > next-generation sequencing data (genomics and/or transcriptomics), > preferentially of eukaryotes, with expertise in bash, R, Python or other > relevant programing language. > > c)     Wet laboratory experience in molecular genetics will be considered a > plus. > > d)    Knowledge of Iberian freshwater ichthyofauna will be considered a > plus. > > For more details about this call, please use the following link: > https://ift.tt/2OsJMjj > > *Application deadline: 10 December 2019* > > -- > Ana Veríssimo, PhD Researcher > > CIBIO - Research Centre in Biodiversity and Genetic Resources > Campus Agrário de Vairão, Rua Padre Armando Quintas > 4485-661 Vairão, Portugal > > https://ift.tt/35Ljj6E > > Ana Verissimo > via IFTTT

[mbimphblog]

ICHTHYOFAUNAL DIVERSITY OF NARAYANAPURAM ANICUT AT NAGAVALI RIVER, SRIKAKULAM DISTRICT OF ANDHRA PRADESH, INDIA |  UTTAR PRADESH JOURNAL OF ZOOLOGY

From July 2019 to June 2021, ichthyofaunal variety in the Nagavali River near Narayanapuram anicut was recorded. Fifty-six fish species are found, divided into nine orders, 19 families, and 34 genera. Cypriniformes accounted for 42.86 percent of the total species in this study, followed by Siluriformes (23.21 percent), Perciformes (16.07 percent), Channiformes (7.14 percent), Osteoglossiformes, Cyprinodontiformes, Ostariophysi, Anguilliformes, and Beloiniformes (1.64.00 percent each). The population status with the highest number and percentage composition is common, which contributed 42.85 percent, followed by abundant, which contributed 25.00 percent, moderate, which contributed 19.64 percent, and moderate, which provided 12.50 percent. From 0.91 to 1.57, the Shannon-Weiner diversity index (H) was used. September had the largest maximum diversity ln(S) and April and May had the lowest from 2019 to 2021.

Please see the link :- http://mbimph.com/index.php/UPJOZ/article/view/2458

[shirlleycoyle]

Video Reveals Locally Extinct Shark In Brazilian Oceanic Islands

One hundred and sixty-five species of elasmobranchs (sharks and rays) have been recorded off the Brazilian coast, accounting for 55% of the endangered Brazilian marine ichthyofauna. Video now reveals a locally extinct shark in some Brazilian oceanic islands. Video Reveals Locally Extinct Shark In Brazilian Oceanic Islands syndicated from https://triviaqaweb.wordpress.com/feed/

[mechcrunch]

Toads on the move again - the environment

Toads on the move again – the environment

[ad_1]

Toads are small nomads. She does not keep it permanently in the same place. In these days the toad migration comes in many parts of Germany to its climax. Motorists should therefore take special care now.

"This is especially true for lower and heat-favored locations," says Sascha Schleich, spokesman for the Federal Expert Committee Field Herpetiology and Ichthyofauna at the Nature…

[huuvinhp]

New Post has been published on THIẾT BỊ KHOA HỌC CÔNG NGHỆ

New Post has been published on http://thietbikhoahoccongnghe.com.vn/sinh-hoc-phan-4.html

Sinh học - Phần 4

Ứng dụng hiện đại  Sinh học bây giờ kết hợp nhiều lĩnh vực khác nhau bao gồm nhưng không giới hạn địa lý vật lý, địa chất, thực vật học và sinh học thực vật, động vật học và sinh học tổng hợp. Trọng tâm chính của nhà địa lý học là các yếu tố môi trường và ảnh hưởng của con người đến sự phân bố của các loài cụ thể. Về mặt ứng dụng sinh học như là một khoa học ngày nay, những tiến bộ kỹ thuật đã cho phép hình ảnh vệ tinh và chế biến Trái đất . Hai loại hình ảnh vệ tinh chính quan trọng trong khảo sát địa sinh học hiện đại là Mô hình Hiệu quả Sản xuất toàn cầu (GLO-PEM) và Hệ thống Thông tin Tổng hợp (GIS). GLO-PEM sử dụng hình ảnh vệ tinh cung cấp cho “lặp đi lặp lại, không gian tiếp giáp và thời gian cụ thể quan sát thực vật.” Những quan sát này trên quy mô toàn cầu. GIS có thể cho thấy một số quá trình trên bề mặt trái đất như vị trí cá voi, nhiệt độ bề mặt biển và độ sâu. [23] Các nhà khoa học hiện nay cũng sử dụng các rạn san hô để nghiên cứu lịch sử sinh học thông qua các rạn san hô hóa thạch.

Paleobiogeography Paleobiogeography đi một bước xa hơn để bao gồm các dữ liệu cổ sinh vật và cân nhắc về kiến ​​tạo kiến ​​tạo mảng. Sử dụng phân tích phân tử và chứng thực bởi các hóa thạch, người ta đã có thể chứng minh rằng chim đậu đầu tiên phát triển trong khu vực của Úc hoặc liền kề Nam Cực (lúc bấy giờ nào nằm hơi xa hơn và đã có một khí hậu ôn đới phía bắc). Từ đó, họ lan sang các lục địa khác và Đông Nam Á Gondwanan – một phần của Laurasia Sau đó, gần nhất của họ đối với nguồn gốc của sự phân tán – vào cuối Paleogen, trước khi đạt được sự phân bố tổng thể trong những năm đầu Neogen . Không biết có đồng nghiệp tại thời điểm phát tán, Ấn Độ Dương là hẹp hơn nhiều so với hiện nay, và que Nam Mỹ là gần gũi hơn với Nam Cực, người ta sẽ bị áp lực mạnh để giải thích sự có mặt của nhiều dòng “cổ xưa” của các loài chim đậu ở châu Phi, cũng như phân phối các suboscines Nam Mỹ.

Paleobiogeography Cũng giúp hạn chế các giả thuyết về thời gian của các sự kiện địa sinh học như vicariance và geodispersal, và Cung cấp thông tin duy nhất về sự hình thành của hệ sinh vật trong khu vực. Ví dụ, dữ liệu từ các nghiên cứu phát sinh loài và địa sinh học loài cấp cho chúng tôi biết que khu hệ cá Amazon tích lũy trong từng bước trong khoảng thời gian căng thẳng của hàng triệu năm, chủ yếu bằng phương tiện của sự biệt hóa loài khác vùng, và trong một đấu trường Mở rộng trên hầu hết các lĩnh vực vùng nhiệt đới Nam Mỹ (Albert & Reis 2011). Nói cách khác, một số đảo Không giống như động vật nổi tiếng (chim sẻ Galapagos, ruồi drosophilid Hawaii, Phi Rift Hồ cichlid), các ichthyofauna Amazon loài giàu không phải là kết quả của bức xạ thích nghi gần đây .

Đối với sinh vật nước ngọt, danh lam thắng cảnh được tự nhiên chia thành các lưu vực thoát nước rời rạc bởi lưu vực sông, từng giai đoạn cách ly và đoàn tụ bởi quá trình xói mòn. Ở các khu vực như lưu vực sông Amazon có đặc điểm địa hình đặc biệt thấp (phẳng), nhiều đường thủy đã có lịch sử lâu dài về lịch sử địa chất. Trong bối cảnh như vậy, việc khai thác suối là một yếu tố quan trọng ảnh hưởng đến sự tiến hóa và phân bố các sinh vật nước ngọt. Lượng dòng chảy xảy ra khi phần thượng lưu thoát nước được chuyển hướng tới phần hạ lưu của lưu vực lân cận. Điều này có thể xảy ra như là kết quả của quá trình nâng kiến ​​tạo (hoặc lún), được tạo ra bởi sạt lở tự nhiên xây đập, hoặc hoặc xói mòn của headward bên giữa các lưu vực lưu vực sông liền kề.