{"id":729,"date":"2018-06-11T22:11:55","date_gmt":"2018-06-12T01:11:55","guid":{"rendered":"https:\/\/www.ufrgs.br\/ictio\/?p=729"},"modified":"2018-06-11T22:11:55","modified_gmt":"2018-06-12T01:11:55","slug":"influence-of-land-use-on-the-health-of-a-detritivorous-fish-ancistrus-mullerae-endemic-to-the-iguassu-ecoregion-relationship-between-agricultural-land-use-and-severe-histopathological-alterations","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ictio\/2018\/06\/11\/influence-of-land-use-on-the-health-of-a-detritivorous-fish-ancistrus-mullerae-endemic-to-the-iguassu-ecoregion-relationship-between-agricultural-land-use-and-severe-histopathological-alterations\/","title":{"rendered":"Influence of land use on the health of a detritivorous fish (Ancistrus mullerae) endemic to the Iguassu ecoregion: relationship between agricultural land use and severe histopathological alterations"},"content":{"rendered":"

Mayara\u00a0Pereira\u00a0Neves<\/strong>,\u00a0<\/span>Jo\u00e3o\u00a0Paulo\u00a0de\u00a0Arruda Amorim,\u00a0<\/span>Rosilene\u00a0Luciana\u00a0Delariva<\/span><\/p>\n

Abstract<\/h2>\n

This study aimed to evaluate the histopathological biomarkers of the gills and liver of endemic catfish to test the hypothesis that, in environments under intense land use by agricultural activities, histopathological alterations occur more severely. Samples were collected by electrofishing in seven streams in the Lower Igua\u00e7u basin quarterly from August 2015 to February 2016. The gills and livers were processed according to routine histological methods and examined by light microscopy. The histopathological alterations observed in fish from the streams with a higher percentage of natural vegetation cover were considered modest and indicated normal functioning of the organ (such as edema, hyperplasia, and leukocyte infiltration). As predicted, fish collected in streams with higher agricultural influence presented moderate to severe damage (aneurysm, vacuolization and cytoplasmic degeneration, and pyknotic nucleus). The abundance of chloride cells was significantly increased in the gills of\u00a0Ancistrus mullerae<\/em>\u00a0collected in rural streams. In addition, in most streams, mucous cells were more abundant during the rainy period. Significant differences were observed in the histopathological index (HI) of the gills and livers, where severe histopathological alterations occurred in fish from streams with a higher agricultural influence. The observed alterations were more severe in the liver than in the gills, which are indeed related to the liver\u2019s key role in the detoxification of xenobiotics. We conclude that more severe histological alterations occurred in fish from streams with the highest land use by agricultural activities. Thus, our work provides important insight into the conservation and management of natural resources.<\/p>\n

LINK:\u00a0https:\/\/link.springer.com\/article\/10.1007%2Fs11356-018-1283-0<\/a><\/p>\n

\"\"<\/a>

Fig. 4 Sections of hepatic tissue of A. mullerae sampled in streams with different land uses belonging to the Lower River Igua\u00e7u basin, Brazil, during the dry and rainy period\/2015\u20132016. a Normal hepatocytes and blood vessel (bv) in forest stream (F1). b Vascular congestion (asterisk) and melanomacrophage aggregates (arrowhead) in forest stream (F2). c. Leukocyte infiltration (arrow) in forest stream (F1). d Normal nucleus (arrowhead) and nuclear hypertrophy (arrow) in rural stream (R1). e Cytoplasmic vacuolization with nucleus in lateral position in rural stream (R3). f Pyknotic nucleus (arrowhead) in rural stream (R2). Harris\u2019s hematoxylin and eosin (HE)<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"

Mayara\u00a0Pereira\u00a0Neves,\u00a0Jo\u00e3o\u00a0Paulo\u00a0de\u00a0Arruda Amorim,\u00a0Rosilene\u00a0Luciana\u00a0Delariva Abstract This study aimed to evaluate the histopathological biomarkers of the gills and liver of endemic catfish to test the hypothesis that, in environments under intense land use by agricultural activities, histopathological alterations occur more severely. Samples were collected by electrofishing in seven streams in the Lower Igua\u00e7u basin quarterly from August 2015 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-729","post","type-post","status-publish","format-standard","hentry","category-sem-categoria"],"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/729","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/comments?post=729"}],"version-history":[{"count":1,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/729\/revisions"}],"predecessor-version":[{"id":731,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/posts\/729\/revisions\/731"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/media?parent=729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/categories?post=729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ictio\/wp-json\/wp\/v2\/tags?post=729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}