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Ecological Intelligence / Subject

hydroperiod

Peer-reviewed Latin America & Caribbean

Neighboring tropical coastal lagoons were more different from each other than they were from month to month

Evidence
Peer-reviewed
Geography
Piratininga, Maricá and Jaconé lagoons, Rio de Janeiro, Brazil
System
Choked coastal lagoons / benthos

WHAT THE EVIDENCE SAYS

Monthly sampling from July 2022 to May 2024 at one site in each of three neighboring coastal lagoons recorded 30,221 macroinvertebrates across 14 taxa. Local lagoon-site differences dominated abiotic and community variation; sediment characteristics and salinity were key correlates, while temporal change was expressed mainly through hydroperiod within years rather than a uniform monthly sequence.

WHY IT MATTERS / OUR READ

Regional labels such as ‘coastal lagoon’ can hide strong local ecological templates. Monitoring and restoration comparisons will be more credible when salinity, sediment, exchange and disturbance regime are treated as defining conditions rather than background noise.

CAVEATS / UNCERTAINTY

Sampling was restricted to one fixed site per lagoon, so the study characterizes local conditions rather than whole lagoon systems. Highly mobile epibenthic organisms were likely underrepresented, and the three lagoons are a regional comparison rather than a globally representative sample.

SOURCE

Estuaries and Coasts
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Across 23 months in southeastern Brazil, persistent local sediment and salinity conditions explained benthic-community structure more strongly than most temporal variation.

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Peer-reviewed North America

A managed drawdown doubled wetland food capacity—then most of the gain faded within a year

Evidence
Peer-reviewed
Geography
Big Lake National Wildlife Refuge, northeast Arkansas, USA
System
Semi-permanent emergent wetland / waterfowl habitat

WHAT THE EVIDENCE SAYS

A June–July 2022 drawdown was tracked with vegetation mapping, aerial surveys, eBird-informed migration curves and energetic models across 2021–2023. Non-persistent emergent vegetation increased 310% from fall 2021 to fall 2022. Modeled energetic carrying capacity more than doubled immediately after the drawdown, then was similar to the pre-drawdown year in 2023 and still did not meet refuge objectives.

WHY IT MATTERS / OUR READ

For wetland managers, the useful signal is that drawdown can act as a strong early-successional reset without becoming a permanent state change. Timing and recurrence should be tied to vegetation response and energetic objectives, with monitoring used to decide when another reset is actually warranted.

CAVEATS / UNCERTAINTY

This is one refuge and one documented drawdown, conducted relatively late in the growing season. Energetic carrying capacity is modeled, waterfowl-use estimates combine multiple data sources, and the study does not establish an optimal universal drawdown interval. Site hydrology, seed bank, nuisance species and other wildlife objectives can change the tradeoff.

SOURCE

Wetlands
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At Big Lake National Wildlife Refuge, moist-soil vegetation jumped 310% after dewatering and modeled waterfowl energy more than doubled, but the energetic gain returned near baseline the next year.

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Peer-reviewed North America

An invasive pasture grass hit a native wetland plant hardest where the hydroperiod was longest

Evidence
Peer-reviewed
Geography
Camas Prairie Centennial Marsh, south-central Idaho, USA
System
Wet meadow

WHAT THE EVIDENCE SAYS

From 2020–2023, native Camassia quamash had higher survival but generally lower flowering in drier upslope areas. The invasive grass Alopecurus arundinaceus showed stronger negative effects on camas survival in longer-hydroperiod areas in some transitions, while effects on growth and flowering were less consistent.

WHY IT MATTERS / OUR READ

Hydrology can change the strength of an invasion effect within the same wetland. That argues against uniform invasive-plant prescriptions across topographic and hydroperiod zones.

CAVEATS / UNCERTAINTY

Year effects and plot composition could not be fully separated, not every response repeated across transitions, and this is one culturally important wet meadow. Management inferences need local hydrology and Tribal stewardship context.

SOURCE

Wetlands
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Four years of Camas Prairie monitoring found the invasive grass’s per-unit negative effect on camas survival strengthening in wetter portions of the meadow in some years.

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Peer-reviewed Latin America & Caribbean

One degraded Mexican lagoon shows why mangrove rehabilitation starts with hydroperiod and salinity

Evidence
Peer-reviewed
Geography
Marismas Nacionales, Mexico
System
Semiarid coastal lagoon and fringe red mangrove

WHAT THE EVIDENCE SAYS

Researchers monitored water level, temperature, rainfall and salinity across 57 sites spanning four stand conditions. The analysis links red-mangrove distribution and condition to hydroperiod and salinity, providing a hydrological basis for screening rehabilitation locations.

WHY IT MATTERS / OUR READ

Planting maps are weak restoration plans if the water regime is wrong. Site hydrology can be treated as a prerequisite layer before managers decide where active mangrove intervention is likely to persist.

CAVEATS / UNCERTAINTY

This is one year of observational data from one semiarid lagoon. Habitat suitability is not the same as demonstrated restoration success, and the identified relationships need validation across years and other geomorphic settings.

SOURCE

Wetlands Ecology and Management
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A year of site-level monitoring across healthy, transitional and degraded red-mangrove stands identified hydrological and salinity differences that can help locate plausible rehabilitation sites.

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