Allochthonous vs. autochthonous energy resources for aquatic insects in cloud forest streams, Veracruz, Mexico

The monotypic genus Lankanectes, considered an evolutionary long branch with India’s Nyctibatrachus as its sister lineage, is represented by L. corrugatus, a species widely distributed within the wet zone of Sri Lanka up to 1500 m asl, where it inhabits a variety of lotic and lentic habitats. Here, following an integrative taxonomic approach using DNA-based phylogenies, morphology, morphometry, and ecological niche models, we describe a new species—Lankanectes pera sp. nov. The new species is distinguished from its sister species mainly by its tuberculated throat and absence of dark patches on venter, throat, manus and pes. The uncorrected genetic distances between the two Lankanectes species for a fragment of the non-coding mitochondrial 16S rRNA gene is 3.5–3.7%. The new species has a very restricted climatic distribution with a total predicted area of only 360 km2 (vs. 14,120 km2 for L. corrugatus). Unlike L. corrugatus, which prefers muddy substrates and marshy areas, the new species is observed inhabiting only pristine streams flowing through canopy covered montane forests in the highest reaches of the Knuckles Mountain range. The specialized new species will need immediate conservation attention due to its restricted distribution (montane isolate), specialized habit of inhabiting clear mountain streams, and small population size.

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Food availability and life history patterns of aquatic insects in evergreen eucalypt forest streams in southeastern Australia

SIL Proceedings 1922-2010 ◽

10.1080/03680770.1995.11900866 ◽

1998 ◽

Vol 26 (3) ◽

pp. 986-989

Author(s):

Ian C. Campbell ◽

Supatra Parnrong ◽

Simon Treadwell

Keyword(s):

Life History ◽

Food Availability ◽

Aquatic Insects ◽

Southeastern Australia ◽

Eucalypt Forest ◽

Life History Patterns ◽

Forest Streams

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Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon

Brazilian Journal of Biology ◽

10.1590/1519-6984.232701 ◽

2022 ◽

Vol 82 ◽

Author(s):

S. M. Santos ◽

P. H. R. Aride ◽

J. Pantoja-Lima ◽

A. T. Oliveira ◽

J. A. S. Zuanon

Keyword(s):

Aquatic Insects ◽

Competitive Exclusion ◽

Low Frequency ◽

Stomach Contents ◽

Relative Volume ◽

Ornamental Fish ◽

Trophic Relationships ◽

Lowland Forest ◽

Food Items ◽

Forest Streams

Abstract The present study objectified to evaluate the trophic relationships and the possible aggressive mimicry involving Carnegiella strigata, Carnegiella marthae and Gnathocharax steindachneri, in lowland forest streams. Samplings occurred in November 2002, March and August 2003 in Amanã Sustainable Development Reserve (ASDR). The total of 943 fish was caught, being 79.43% of C. marthae, 3.18% of C. strigata and 17.39% of G. steindachneri. Stomach contents, degree of stomach repletion, relative volume and frequency of occurrence of food items were evaluated. Thirteen food items were identified, and the presence of terrestrial and aquatic insects indicates the high dependence of these species and the flooded forest. Low feeding overlap was observed between Carnegiella strigata and C. marthae compared to Gnathocharax steindachneri. However, the overlap between the two Carnegiella species was relatively high, which could explain the low frequency of syntopic occurrence among these species, suggesting a possible case of competitive exclusion.

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Distribution and structure of lotic macroinvertebrate communities and the influence of environmental factors in a tropical cloud forest, Cusuco National Park, Honduras

Journal of Limnology ◽

10.4081/jlimnol.2016.1522 ◽

2016 ◽

Author(s):

Paul O'Callaghan ◽

Mary Kelly-Quinn

Keyword(s):

Environmental Factors ◽

National Park ◽

Cloud Forest ◽

Multivariate Techniques ◽

Macroinvertebrate Communities ◽

Aquatic Communities ◽

Cloud Forests ◽

Anthropogenic Pressures ◽

Tropical Cloud Forest ◽

Forest Streams

<p>Neotropical cloud forests are a critically endangered ecosystem characterised by their unusual hydrological conditions which frequently make them important sources of clean potable water. To facilitate any meaningful research on cloud forest streams it is necessary to first describe the structure and composition of the local lotic aquatic communities and to establish which environmental factors structure them under natural conditions. The present study sampled the macroinvertebrate communities of rivers draining the montane cloud forests of Cucuso National Park in Honduras, where increasing anthropogenic pressures are threatening water quality. Using multivariate techniques a bottom-up approach was adopted to establish groups of similar sites and identify environmental factors driving the differences between these. Three site groupings emerged based largely on differences in taxon composition driven mainly by pH and altitude.</p>

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Contribution of adult aquatic insects to riparian prey availability along tropical forest streams

Marine and Freshwater Research ◽

10.1071/mf07033 ◽

2007 ◽

Vol 58 (8) ◽

pp. 725 ◽

Cited By ~ 17

Author(s):

Eric K. W. Chan ◽

Yixin Zhang ◽

David Dudgeon

Keyword(s):

Hong Kong ◽

Aquatic Insects ◽

Prey Availability ◽

Aquatic Insect ◽

Total Biomass ◽

Wet Season ◽

Limited Dispersal ◽

Terrestrial Insects ◽

Forest Streams ◽

Adult Aquatic Insects

The contribution of adult aquatic insects to riparian prey availability at four sites along three hillstreams in Hong Kong was estimated during 2004–2006 dry and wet seasons using light traps deployed at different distances from the banks. The number and biomass of aquatic and terrestrial insects collected were markedly higher during the wet season. Numerically, aquatic insects (especially Chironomidae and Philopotamidae) remained a major catch component along banks throughout the year comprising 77% (range: 61–85%) of total insects. Their contribution to total biomass was higher in the wet season (mean: 50%, range: 33–62%) than during the dry season (mean: 21%, range: 8–45%). Aquatic insect abundance decreased with increasing distance from streams during both seasons: numbers at 10–20 m distance were less than 45% of those at the banks, declining to less than 13% at 80 m distance. No such decline with distance was observed for terrestrial insects, but the limited dispersal of aquatic insects meant total insect catches were highest along stream banks. Changes in biomass with distance from streams were similar to those for abundance. Adult aquatic insects may represent an important water-to-land energy subsidy for riparian predators in Hong Kong, but the magnitude varied seasonally and fell sharply with increasing distance from streams.

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