Climate vulnerability of South American freshwater fish: Thermal tolerance and acclimation

2021 ◽  
Author(s):  
Derek F. Campos ◽  
Renan D. Amanajás ◽  
Vera M. F. Almeida‐Val ◽  
Adalberto L. Val
Keyword(s):  
Freshwater Fish ◽  
Thermal Tolerance ◽  
South American ◽  
Climate Vulnerability

scholarly journals Greater local adaptation to temperature in the ocean than on land

2021 ◽  
Author(s):  
Matthew Sasaki ◽  
Jordanna Barley ◽  
Sarah Gignoux-Wolfsohn ◽  
Cynthia Hays ◽  
Morgan Kelly ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Thermal Tolerance ◽  
Meta Analysis ◽  
Marine Species ◽  
Climate Impacts ◽  
Species Level ◽  
Behavioral Thermoregulation ◽  
Considerable Uncertainty ◽  
Dispersal Potential ◽  
Climate Vulnerability

Abstract Warming threatens biodiversity but there is considerable uncertainty in which species and ecosystems are most vulnerable. Moreover, our understanding of organismal sensitivity is largely centered on species level assessments, which do not consider variation across populations. Here, we used meta-analysis to quantify differentiation in thermal tolerance across 413 populations from 105 species living in terrestrial, marine, and freshwater realms. Strikingly, we found strong differentiation in heat tolerance across populations in marine and intertidal taxa but not terrestrial or freshwater taxa. This is counter to the expectation that increased dispersal potential in the ocean should reduce intraspecific variation. Our findings are consistent with the “Bogert effect” operating in terrestrial but not marine ecosystems, which predicts that behavioral thermoregulation constrains evolution. Such adaptive differentiation in the ocean suggests that there may be standing genetic variation at the species level to buffer climate impacts. Assessments of organismal vulnerability to warming, especially in marine species, should account for variation in thermal tolerance among populations or risk under- or overestimating climate vulnerability.

scholarly journals Candidate Species for Florida Aquaculture: Arapaima Arapaima gigas

EDIS ◽  
2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Cortney Ohs ◽  
Jeffrey Hill ◽  
Sarah Wright ◽  
H. Mae Giddings ◽  
Allison Durland Donahou
Keyword(s):  
Freshwater Fish ◽  
South Florida ◽  
South American ◽  
Culture Methods ◽  
Stage Of Development ◽  
Unique Biology ◽  
Arapaima Gigas ◽  
Candidate Species ◽  
Specific Culture

Arapaima Arapaima gigas, also known as paiche and pirarucu, is a large South American freshwater fish with unique biology, favorable aquaculture characteristics, and potential for production in south Florida. This publication provides Arapaima gigas biology, specific culture methods known for each stage of development, and information about diseases and parasites, markets, and the laws associated with this species to potential Florida producers.

scholarly journals Helminth parasites of freshwater fish from Central America

Zootaxa ◽  
2008 ◽  
Vol 1915 (1) ◽  
Author(s):  
GUILLERMO SALGADO-MALDONADO
Keyword(s):  
South America ◽  
Freshwater Fish ◽  
Central America ◽  
Current Knowledge ◽  
Taxonomic Composition ◽  
Parasite Fauna ◽  
Helminth Species ◽  
Helminth Parasite ◽  
South American ◽  
Helminth Parasites

This study is a compilation of current knowledge of the taxonomic composition and distribution of the helminth parasites of freshwater fish in Central America. A list of 111 adult helminth species up to day reported from 17 freshwater fish families from Central America was compiled. The data show a helminth parasite fauna in freshwater fish that is typical to the region. One hundred and two of the known helminth species are endemic to the area, 32 of which can be derived from South American genera. Nematodes were the most abundant group, followed by monogeneans and trematodes. None of the 29 helminth families recorded to date is exclusive to Central America, while 16 of the 65 recorded genera have been only recorded from this area. Twenty three of these genera are South American lineages. The data suggest that helminth parasites of freshwater fish from Central America constitute a recent fauna derived mainly from South America but not found there.

Ascaridoid nematodes of amphibians and reptiles: Goezia

1978 ◽  
Vol 52 (1) ◽  
pp. 91-98 ◽  
Author(s):  
J. F. A. Sprent
Keyword(s):  
New Species ◽  
Freshwater Fish ◽  
East Coast ◽  
South American ◽  
Sea Snakes ◽  
Crocodylus Porosus ◽  
Cape York ◽  
Host Relationships ◽  
Australian Freshwater ◽  
A New Species

ABSTRACTA new species in the genus Goezia is described from aquatic reptiles of the northern shores of Australia, west of Cape York Peninsula. It was collected from Crocodylus porosus, from a file snake (Achrochordus granulatus), and from sea snakes (Lapemis hardwickii, Enhydrina schistosa, Hydrophis elegans, and H. caerulescens). The new species is compared with G. fluviatilis from Australian freshwater fish, with G. minuta from marine fish of the east coast of North America, and with G. spinulosa and G. intermedia from South American freshwater fish. The host-relationships of the genus are discussed.

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